1 INSTRUCTION MANUAL2 INTRODUCTION...4 WARNING...4 QUICK SETUP...5 ASSEMBLING THE NEXSTAR...8 Powering the NexStar...8 A...
INSTRUCTION MANUAL
INTRODUCTION ..........................................................................................................................................4 WARNING ......................................................................................................................................................4 QUICK SETUP ...............................................................................................................................................5 ASSEMBLING THE NEXSTAR ....................................................................................................................8 Powering the NexStar ..............................................................................................................................8 Attaching the NexStar to the Tripod.........................................................................................................9 The Hand Control ....................................................................................................................................9 The Star Diagonal..................................................................................................................................10 The Eyepiece ..........................................................................................................................................10 The Star Pointer Finderscope ................................................................................................................11 HAND CONTROL .......................................................................................................................................13 Hand Control Operation ........................................................................................................................14 Alignment Procedure .............................................................................................................................14 Object Catalog .......................................................................................................................................16 Selecting an Object ................................................................................................................................16 Slewing to an Object ..............................................................................................................................17 Finding Planets ......................................................................................................................................17 Tour Mode..............................................................................................................................................17 Direction Buttons ...................................................................................................................................18 Rate Button.............................................................................................................................................18 Setup Procedures ...................................................................................................................................18 Tracking Mode .......................................................................................................................................18 Tracking Rate.........................................................................................................................................19 Date/Time...............................................................................................................................................19 User Defined Objects .............................................................................................................................19 Get RA/DEC...........................................................................................................................................19 Get Alt-Az...............................................................................................................................................19 Goto R.A/Dec .........................................................................................................................................20 Goto Alt-Az.............................................................................................................................................20 Utility Features ......................................................................................................................................20 Demo ......................................................................................................................................................20 RS-232....................................................................................................................................................20 Light Control..........................................................................................................................................20 Cord Wrap..............................................................................................................................................20 Anti-backlash .........................................................................................................................................20 TELESCOPE BASICS .................................................................................................................................22 Image Orientation ..................................................................................................................................22 Focusing .................................................................................................................................................23 Calculating Magnification .....................................................................................................................23 Determining Field of View .....................................................................................................................23 General Observing Hints .......................................................................................................................24 ASTRONOMY BASICS...............................................................................................................................25 The Celestial Coordinate System ...........................................................................................................25 Motion of the Stars .................................................................................................................................26 Polar Alignment (with optional Wedge).................................................................................................27 Finding the North Celestial Pole ...........................................................................................................28 CELESTIAL OBSERVING.........................................................................................................................29 Observing the Moon...............................................................................................................................29 Observing the Planets ............................................................................................................................29
Observing the Sun ..................................................................................................................................30 Observing Deep Sky Objects ..................................................................................................................30 Seeing Conditions ..................................................................................................................................30 Transparency .........................................................................................................................................30 Sky Illumination .....................................................................................................................................30 Seeing.....................................................................................................................................................31 CELESTIAL PHOTOGRAPHY .................................................................................................................32 Short Exposure Prime Focus Photography............................................................................................32 Eyepiece Projection................................................................................................................................33 Long Exposure Prime Focus Photography ............................................................................................34 Terrestrial Photography.........................................................................................................................35 CCD Imaging .........................................................................................................................................36 TELESCOPE MAINTENANCE .................................................................................................................37 Care and Cleaning of the Optics............................................................................................................37 Collimation.............................................................................................................................................37 OPTIONAL ACCESSORIES ....................................................................................................................39 APPENDIX A - TECHNICAL SPECIFICATIONS..................................................................................42 APPENDIX B – GLOSSARY OF TERMS.................................................................................................43 APPENDIX C –LONGITUDES AND LATITUDES.................................................................................46 APPENDIX D - RS-232 CONNECTION....................................................................................................51 APPENDIX E – MAPS OF TIME ZONES ................................................................................................52 SKY MAPS....................................................................................................................................................54
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Congratulations on your purchase of the Celestron NexStar! The NexStar ushers in a whole new generation of computer automated technology. Simple and friendly to use, the NexStar is up and running after locating just two alignment stars. It’s the perfect combination of power and portability. If you are new to astronomy, you may wish to start off by using the NexStar's built-in Sky Tour feature, which commands the NexStar to find the most interesting objects in the sky and automatically slews to each one. Or if you are an experienced amateur, you will appreciate the comprehensive database of over 18,000 objects, including customized lists of all the best deep-sky objects, bright double stars and variable stars. No matter at what level you are starting out, the NexStar will unfold for you and your friends all the wonders of the Universe. Some of the many standard features of the NexStar include: •
Incredible 6°/second (or faster) slew speed.
•
Fully enclosed optical encoders for position location.
•
Integrated hand controller – built into the side of the fork arm.
•
RS-232 port allows use with a computer and software programs like The Sky for point and click slewing.
•
Storage for programmable user defined objects; and
•
Many other high performance features!
The NexStar’s deluxe features combine with Celestron’s legendary Schmidt-Cassegrain optical system to give amateur astronomers one of the most sophisticated and easy to use telescopes available on the market today. Take time to read through this manual before embarking on your journey through the Universe. It may take a few observing sessions to become familiar with your NexStar, so you should keep this manual handy until you have fully mastered your telescope’s operation. The NexStar hand control has built-in instructions to guide you through all the alignment procedures needed to have the telescope up and running in minutes. Use this manual in conjunction with the on-screen instructions provided by the hand control. The manual gives detailed information regarding each step as well as needed reference material and helpful hints guaranteed to make your observing experience as simple and pleasurable as possible. Your NexStar telescope is designed to give you years of fun and rewarding observations. However, there are a few things to consider before using your telescope that will ensure your safety and protect your equipment.
Warning Never look directly at the sun with the naked eye or with a telescope (unless you have the proper solar filter).
Permanent and irreversible eye damage may result. Never use your telescope to project an image of the sun onto any surface. Internal heat build-up can damage the
telescope and any accessories attached to it. Never use an eyepiece solar filter or a Herschel wedge. Internal heat build-up inside the telescope can cause these
devices to crack or break, allowing unfiltered sunlight to pass through to the eye. Never leave the telescope unsupervised, either when children are present or adults who may not be familiar with the
correct operating procedures of your telescope.
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3 1
Press ENTER on the hand control to begin alignment. Use the Up and Down arrow buttons to position the tube horizontal to the ground. Attach the included accessories (star diagonal, eyepiece and Star Pointer finderscope) and remove the front lens cover. Turn on Star Pointer by rotating the dial on the side. (For instructions on aligning the Star Pointer see page 11).
Remove the NexStar from its packaging and place the base on a sturdy, level surface or attach to tripod (see page 9). Remove the accessories from their individual boxes.
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2 AC Adapter
Direction Buttons
On / Off Switch
Up and Down Scroll Buttons
Plug-in the supplied 12v AC adapter* into the jack at the base of the fork arm and an AC outlet. Power the NexStar by flipping the "On/Off" switch to the "On" position. Use the Up and Down scroll buttons to get to the AutoAlign menu. Press ENTER. Use the direction arrow keys to level the tube and rotate it towards North. (See Astronomy Basics for help on finding North). Input the necessary date and time information as instructed by the hand control. (See Hand Control section for complete instruction on entering data).
*Note: Use only the AC adapter supplied by Celestron. Using any other adapter may damage the electronics and will void your manufacturer's warranty. 5
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APPENDIX C LONGITUDE LATITUDE degrees min degrees min Torrance
118
19.8
33
48
Travis AFB
121
55.8
38
16.2
Tahoe
120
7.8
39
19.2
The first time the NexStar is used, the longitude and latitude must be entered into the hand control. When the display reads, Select Location, use Appendix C to look up the longitude and latitude of your nearest city and enter it into the hand control. When asked to Save Location, press ENTER and assign the number 1 to the current location. This number can be used for future alignments. (See page 14 for complete alignment procedures.)
Catalog Keys Object List Button
TOUR Button
Press the TOUR button on the hand control. Use the Up and Down scroll keys to select the current month and press ENTER. The hand control will display the first object that is visible for that month. Press INFO to read information about the object displayed. Press the DOWN scroll key to display the next object. Press ENTER to slew to (go to) the displayed object.
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The NexStar will automatically pick an alignment star and slew the telescope close to that star. Once there, the display will ask you to use the arrow buttons to aim the Star Pointer at the star. If the star is not visible (perhaps behind a tree), press UNDO to select a new star. Next, center the star in the eyepiece and press ALIGN. Repeat these steps for the second star alignment. When complete, display will read "Alignment Alignment Successful". Successful"
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Focuser Knob
Use the focus knob to bring objects into a sharp focus. Use arrow keys to center objects in the eyepiece. (See page 29 for observing hints and techniques).
1 2
10
3
9
4
5
8 6
7
Figure 1-A - The NexStar 8
1 2 3 4 5
Optical Tube Star Pointer Finderscope Eyepiece Star Diagonal Focuser Knob
6 7 8 9 10
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Battery Compartment Tripod ON/OFF Switch Hand Control Liquid Crystal Display
The NexStar comes completely pre-assembled and can be operational in a matter of minutes. The NexStar is conveniently packaged in one reusable shipping carton that contains all of the following accessories: • • • •
•
40mm Plossl Eyepiece – 1¼" 1¼" Star Diagonal Star Pointer Finderscope and Mounting Bracket 1¼" Visual Back (attached to the optical tube) AC adapter
Assembling the NexStar
NOTE
Start by removing the telescope from its shipping carton and setting the round base on a flat table or surface. It is best to carry the telescope by holding it from the lower portion of the fork arm and from the bottom of the base. Do not try to move the optical tube or at this time. It should remain facing upward until the telescope is powered up. Remove all of the accessories from their individual boxes. Remember to save all of the containers so that they can be used to transport the telescope. Before attaching the visual accessories, the telescope tube should be positioned horizontal to the ground. To do this, the telescope needs to be powered up and the optical tube must be moved remotely with the hand control. In case of a loss of power, the optical tube can be moved by hand. However, when powered on, the telescope should always be controlled via the hand control. The NexStar will lose its star alignment if moved by hand when powered on.
Powering the NexStar The NexStar can be powered by the supplied 12v AC adapter or eight AA batteries (not included). Batteries should only be used when using the telescope out in the field, where AC power is not available. The battery compartment is located in the center of the telescope's base (see figure 3-1). Before the battery compartment can be removed, the telescope tube must first be moved into a horizontal position. Read the Hand Control section below before installing batteries. To power the NexStar with the 12v AC adapter, simply plug the round post into the 12v outlet on the side of the fork arm To install the batteries: and plug the adapter into any wall outlet. 1.
Remove the battery cover from the center of the base by gently lifting up on the round portion of the cover.
2.
Insert the batteries into the battery compartment of the base.
3.
Reattach the battery compartment door by gently pushing down on the cover until it snaps into place.
4. Turn on the power to the NexStar by flipping the switch, located next to the 12v outlet, to the "On" position. Battery Compartment
On/Off Switch
Figure 3-1: The NexStar can be powered by either an AC adapter or with AA batteries.
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Attaching the NexStar to the Tripod The Celestron NexStar tripod is a sturdy, lightweight mount on which to place your NexStar telescope. Weighing less than 10 pounds, this tripod can go anywhere, from your backyard to a remote observing site. To set up the tripod: 1. 2.
Hold the tripod with the head up, away from the ground. Pull the legs apart until the support bracket is fully extended and press it down flat.
The tripod will now stand by itself. Your tripod is adjustable. The height range is 31" to 54". For maximum rigidity, set the tripod height between 45" and 48". To adjust the height of the tripod: 1.
Locate the hand tighten knobs on the bottom of each tripod leg.
2.
Rotate the knob counterclockwise until the inside portion of the tripod leg slides out.
3.
Extend the center portion of the tripod leg to the desired height.
4.
Tighten the knob to hold the tripod leg in place.
With the tripod set up, you are ready to attach the accessory tray to the tripod. Positioning Pin There are three wing bolts that hold the accessory tray to the leg support bracket. 1.
Locate the three wing bolts.
2. 3.
Place the accessory tray over the bracket and position it so the thread holes in the accessory tray are above the slotted holes in the bracket. Insert the wing bolts up through the slotted holes in the bracket.
4.
Thread the wing bolts into the holes in the accessory tray.
5.
Tighten the wing bolts fully.
6.
With the accessory tray in place, the tripod will be much more stable making it easier to attach the telescope.
Mounting Holes
After the tripod is set up, you are now ready to attach the telescope. The bottom of the NexStar base has three threaded holes that mount to the tripod plate and one hole in the center that goes over the positioning pin on the tripod plate. 1.
Place the center hole in the bottom of the telescope base over the positioning pin in the center of the tripod plate.
2.
Rotate the telescope base until the rubber feet fit snugly into the recesses of the tripod plate and the threaded holes align with the holes in the tripod plate.
3. Thread the three locking bolts from underneath the tripod plate into the bottom of the telescope base. Tighten all three bolts. Warning: Never insert bolts with threads longer than 3/8" into the NexStar base. It can cause damage to the internal motors.
The Hand Control The hand control is located on the side of the fork arm and can be removed and used remotely or used while attached to the fork. The hand control attaches to the fork arm by resting on two posts, located on the bottom of the hand control cradle, and a clip inside the fork arm. To remove the hand control from the fork arm cradle, gently lift the hand control upwards and pull out. To return the hand control into the fork arm, lower the hand control into the cradle so that the two holes in the bottom of the hand
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control go over the posts on the bottom of the cradle, and the opening in the back of the hand control slides over the clip inside the fork arm. Once the telescope is powered up, use the hand control to move the optical tube to the horizontal position:
• •
Press UNDO. This will bypass the normal alignment procedures and will still allow you to control the telescope. Use the Up arrow directional button to move the telescope tube until it is roughly parallel to the ground. This will make it more convenient to attach the necessary accessories as well as remove the front lens cover and install batteries when they are needed.
You are now ready to attach the included visual accessories onto the telescope optical tube.
The Star Diagonal The star diagonal diverts the light at a right angle from the light path of the telescope. For astronomical observing, this allows you to observe in positions that are more comfortable than if you were to look straight through. To attach the star diagonal: 1.
Turn the thumbscrew on the visual back until its tip no longer extends into (i.e., obstructs) the inner diameter of the visual back.
2.
Slide the chrome portion of the star diagonal into the visual back.
Eyepiece
3. Tighten the thumbscrew on the visual back to hold the star diagonal in place. If you wish to change the orientation of the star diagonal, loosen the thumbscrew on the visual back until the star diagonal rotates freely. Rotate the diagonal to the desired position and tighten the thumbscrew.
Star Diagonal
The Eyepiece
Visual Back
The eyepiece, or ocular, is the optical element that magnifies the image focused by the telescope. The eyepiece fits into either the visual back directly or the star diagonal. To install the eyepiece:
Figure 3-2 - The visual accessories
1.
Loosen the thumbscrew on the star diagonal so it does not obstruct the inner diameter of the eyepiece end of the diagonal.
2.
Slide the chrome portion of the eyepiece into the star diagonal.
3.
Tighten the thumbscrew to hold the eyepiece in place. To remove the eyepiece, loosen the thumbscrew on the star diagonal and slide the eyepiece out. Eyepieces are commonly referred to by focal length and barrel diameter. The focal length of each eyepiece is printed on the eyepiece barrel. The longer the focal length (i.e., the larger the number) the lower the eyepiece power or magnification; and the shorter the focal length (i.e., the smaller the number) the higher the magnification. Generally, you will use low-to-moderate power when viewing. For more information on how to determine power, see the section on “Calculating Magnification.” Barrel diameter is the diameter of the barrel that slides into the star diagonal or visual back. The NexStar uses eyepieces with a standard 1-1/4" barrel diameter.
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The Star Pointer Finderscope The Star Pointer is the quickest and easiest way to point your telescope exactly at a desired object in the sky. It's like having a laser pointer that you can shine directly onto the night sky. The Star Pointer is a zero magnification pointing tool that uses a coated glass window to superimpose the image of a small red dot onto the night sky. While keeping both eyes open when looking through the Star Pointer, simply move your telescope until the red dot, seen through the Star Pointer, merges with the object as seen with your unaided eye. The red dot is produced by a light-emitting diode (LED); it is not a laser beam and will not damage the glass window or your eye. The Star Pointer comes equipped with a variable brightness control, two axes alignment control and two quick-release dovetail mounting brackets (one for the NexStar telescope and one for mounting the Star Pointer on other sized telescopes). Before the Star Pointer is ready to be used, it must be attached to the telescope tube and properly aligned: ON/OFF Variable Brightness Control
Glass Window
Azimuth Control Knob Mounting Track Altitude Control Knob Dovetail Mounting Bracket
Figure 3-3: The Star Pointer Finderscope with Mounting Bracket
Star Pointer Installation 1.
First, remove the two 8-32 x ¼" screws located on the top portion of the telescope's rear cell.
2.
Locate the square dovetail bracket that has the proper curvature for the NexStar tube and align the holes with the two holes in the telescope body.
3.
Use the two 8-32 x ¼" screws to tighten down the bracket to the rear cell.
4.
Once the bracket is mounted, slide the mounting track at the bottom of the Star Pointer over the dovetail portion of the bracket. It may be necessary to loosen the two screws on the side of the mounting track before sliding it over the dovetail. The end of the Star Pointer with the glass window should be facing out towards the front of the telescope.
5. Tighten the two screws on the side of the mounting track to secure the Star Pointer to the dovetail bracket.
Star Pointer Operation The star pointer is powered by a long life 3-volt lithium battery (#CR2032) located underneath the front portion of the Star Pointer. Like all finderscopes, the Star Pointer must be properly aligned with the main telescope before it can be used. This is a simple process using the azimuth and altitude control knobs located on the side and bottom of the Star Pointer. The alignment procedure is best done at night since the LED dot will be difficult to see during the day. 1.
To turn on the Star Pointer, rotate the variable brightness control (see figure 3-3) clockwise until you here a "click". To increase the brightness level of the red dot, continue rotating the control knob about 180º until it stops.
2.
Locate a bright star or planet and center it in a low power eyepiece in the main telescope.
3.
With both eyes open, look through the glass window at the alignment star.
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4.
If the Star Pointer is perfectly aligned, you will see the red LED dot overlap the alignment star. If the Star Pointer is not aligned, take notice of where the red dot is relative to the bright star.
5.
Without moving the main telescope, turn the Star Pointer's azimuth and altitude alignment controls until the red dot is directly over the alignment star.
If the LED dot is brighter than the alignment star, it may make it difficult to see the star. Turn the variable brightness control counterclockwise, until the red dot is the same brightness as the alignment star. This will make it easier to get an accurate alignment. The Star Pointer is now ready to be used . Remember to always turn the power off after you have found an object. This will extend the life of both the battery and the LED.
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The NexStar has a removable hand controller built into the side of the fork arm designed to give you instant access to all the functions the NexStar has to offer. With automatic slewing to over 18,000 objects, and common sense menu descriptions, even a beginner can master its variety of features in just a few observing sessions. Below is a brief description of the individual components of the NexStar hand controller: Liquid Crystal Display (LCD) Window: Has a dual-line, 16 character display screen that is backlit for comfortable viewing of telescope information and scrolling text. Align: Instructs the NexStar to use a selected star or object as an alignment position. Direction Keys: Allows complete control of the NexStar in any direction. Use the direction keys to move the telescope to the initial alignment stars or for centering objects in the eyepiece.
1
7
2 8 3 9
10
4
5 11
6
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Figure 4-1 The NexStar Hand Control
Catalog Keys: The NexStar has keys on the hand control to allow direct access to each of the catalogs in its 18,000+ object database. The NexStar contains the following catalogs in its database: Messier – Complete list of all Messier objects. NGC – Complete list of all the deep-sky objects in the Revised New General Catalog.
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Caldwell – A combination of the best NGC and IC objects. Planets - All 8 planets in our Solar System plus the Sun. Stars – A compiled list of the brightest stars from the SAO catalog. List – For quick access, all of the best and most popular objects in the NexStar database have been broken down into lists based on their type and/or common name: Alignment Stars Named Objects Double Stars Variable Stars Asterisms
Common name listing of the brightest stars in the sky. Alphabetical listing of over 50 of the most popular deep sky objects. Numeric-alphabetical listing of the most visually stunning double, triple and quadruple stars in the sky. Select list of the brightest variable stars with the shortest period of changing magnitude. A unique list of some of the most recognizable star patterns in the sky.
Info: Displays coordinates and useful information about objects selected from the NexStar database. Tour: Activates the tour mode, which seeks out all the best objects for a given month and automatically slews the NexStar to those objects. Enter: Pressing Enter allows you to selects any of the NexStar functions and accept entered parameters. Undo: Undo will take you out of the current menu and display the previous level of the menu path. Press Undo repeatedly to get back to a main menu or use it to erase data entered by mistake. Menu: Displays the many setup and utilities functions such as tracking rate and user defined objects and many others. Scroll Keys: Used to scroll up and down within any of the menu lists. A double-arrow will appear on the right side of the LCD when there are sub-menus below the displayed menu. Using these keys will scroll through those sub-menus. Rate: Instantly changes the rate of speed of the motors when the direction buttons are pressed. RS-232 Jack: Allows use with a computer and software programs like The Sky for point and click slewing.
Hand Control Operation This section describes the basic hand control procedures needed to operate the NexStar. These procedures are grouped into three categories: Alignment, Setup and Utilities. The alignment section deals with the initial telescope alignment as well as finding objects in the sky; the setup section discusses changing parameters such as tracking mode and tracking rate; finally, the last section reviews all of the utilities functions such as the RS-232 connection, activating the cord wrap feature and backlash compensation.
Alignment Procedure In order for the NexStar to accurately point to objects in the sky, it must first be aligned to two known positions (stars) in the sky. With this information, the telescope can create a model of the sky, which it uses to locate any object with known coordinates. There are two ways to align the NexStar with the sky depending on what information the user is able to provide. If you know the names of two bright, visible stars in the sky, you can use the two-star alignment method; if you do not know the names of two stars in the sky, you can enter the longitude and latitude (provided in Appendix C) of your observing location and NexStar will auto-align itself to two stars in the sky for you.
Two Star Alignment With the two-star alignment method, the NexStar requires the user to know the positions of only two bright stars in order to accurately align the telescope with the sky and begin finding objects. Once the telescope is powered on, the LCD display will guide you through all the steps to align the telescope properly. Before the telescope is ready to be aligned, it should be set up in an outside location with all accessories (eyepiece, diagonal and Star Pointer) attached and lens cover removed as described in the Assembly section of the manual. Here is an overview of the alignment procedure: 1. Once the NexStar is powered on , Press ENTER to begin alignment. 2. Use the Up and Down scroll keys to select Two Star Align, Align and press ENTER. 3. The NexStar display will ask you to move the telescope tube until it is horizontal to the ground. To do this, use the direction keys (3) to move the telescope until it is roughly level with the ground. Press ENTER. 4. The SELECT STAR 1 message will appear in the top row of the display. Use the up and down scroll keys (10) to select the star you wish to use for the first alignment star. Press ENTER.
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NexStar then asks you to center in the eyepiece the alignment star you selected. Use the direction buttons to slew the telescope to the alignment star.
Helpful Hint
In order to accurately center the alignment star in the eyepiece, it will be necessary to decrease the slew rate of the motors for fine centering. This is done by pressing the RATE key (11) on the hand controller then selecting the number that corresponds to the speed you desire. (9 = fastest , 1 = slowest). Once the alignment star is centered in the field of view of the eyepiece, press the ALIGN key (2) to accept this position. NexStar will then ask you to select and center a second alignment star and press the ALIGN key. It is best to choose alignment stars that are a good distance away from one another. Stars that are at least 40º to 60º apart from each other will give you a more accurate alignment than stars that are close to each other. Once the second star alignment is completed properly, the display will read Alignment Successful, Successful and you will hear the tracking motors turn-on and begin to track.
Auto-Align Alternatively, if you do not know the names of two bright stars, you can align the telescope by entering the longitude and latitude of your observing location, and the NexStar will automatically choose two stars for alignment and roughly center the stars in the field of view of the Star Pointer. Once again the telescope should be set up outside with all accessories attached and the lens cover removed. 1. 2. 3.
4.
Once the NexStar is powered on , Press ENTER to begin alignment. Use the Up and Down scroll keys to select AutoAlign if it is not already displayed, and press ENTER. The telescope will then ask you to use the arrow keys (10) to level the telescope tube and point the front of the telescope towards north. North can be found by finding the direction of the North Star (Polaris) or by using a compass. You do not need to point at the North Star, only the north horizon. For help finding the direction of the North Star, see the Astronomy Basics section of the manual. Alignment only needs to be approximate, however a close alignment will make the auto alignment more accurate. The hand control display will then ask for the following information:
Date - Enter the month, day and year of your observing session. The display will read: mm/dd/yy Time - Enter the current local time for your area. You can enter either the local time (i.e. 08:00), or you can enter military time (i.e. 20:00 ). Select PM or AM. If military time was entered, the hand control will bypass this step. Choose between Standard time or Daylight Savings time. Use the Up and Down scroll buttons (10) to toggle between options. Select the time zone that you are observing from. Again, use the Up and Down buttons (10) to scroll through the choices. If you enter any of the alignment information incorrectly, pressing UNDO acts as a backspace button, and will back the cursor to its previous position allowing you to re-enter any necessary information. Finally, you must enter the longitude and latitude of the location of your observing site. The coordinates can be obtained from a listing in the appendix of this manual. These coordinates can be saved so that the longitude and latitude only has to be entered once from any given location. 1. 2. 3.
Press ENTER at the Select Location display. Use the Up and Down scroll keys to select Enter Long/Lat, Long/Lat if it is not already displayed. Use the table in Appendix C to locate the closest longitude and latitude for your current observing location and enter those numbers when asked in the hand control, pressing ENTER after each entre.
The display will then ask if you would like to save these coordinates for future use. If you press "Yes", the next time you AutoAlign the telescope, you can choose User Defined instead of the Enter Long/Lat Long/Lat, ong/Lat and enter the number for that observing location. To save the entered longitude and latitude, simply press "Yes" and enter a number from 0-9. Pressing ENTER will assign that number to your current position. Based on this information, the NexStar will automatically select a bright star that is above the horizon and slew towards it. At this point the telescope is only roughly aligned, so the alignment star should only be close to the field of view of the Star Pointer finder. Once finished slewing, the display will ask you to use the arrow buttons to center the selected star with the red dot in the center of the Star Pointer. If for some reason the chosen star is not visible (perhaps behind a tree or building) you can press UNDO to select and slew to a different star. Once centered in the finder, press ENTER. The display will then instruct you to center the star in the field of view of the eyepiece. When the star is centered, press ALIGN to accept this star as an alignment star. (There is no need to adjust the slewing rate of the motors after each alignment step. The NexStar automatically selects the best
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slewing rate for aligning objects in both the Star Pointer and the eyepiece). After the first alignment star has been entered the NexStar will automatically slew to a second alignment star and have you repeat this procedure for that star. When the telescope has been aligned to both stars the display will read "Alignment Successful", and you are now ready to find your first object. Trouble Shooting
If the wrong star was centered and aligned to, the NexStar display will read Bad Alignment. Should this occur, the display will automatically ask you to re-center the last alignment star and press ALIGN. If you believe that the wrong star may have been centered (remember the alignment star will always be the brightest star nearest the field of view of the finder), then recenter the star and press ALIGN. If you wish to try aligning on a different star, press UNDO and the NexStar will select two new alignment stars and automatically slew to the first star.
Third Star Alignment The NexStar has a third star alignment feature which allows you to replace either of the two original alignment stars with a new star. This can be useful in several situations: •
•
If you are observing over a period of a few hours, you may notice that your original two alignment stars have drifted towards the west considerably. (Remember that the stars are moving at a rate of 15º every hour). Aligning on a new star that is in the eastern part of the sky will improve your pointing accuracy, especially on objects in that part of the sky. When trying to locate a very faint or small object that may be difficult to find in the eyepiece, you can improve your pointing accuracy by aligning to a third star that is nearest to the object you are trying to find.
To replace an existing alignment star with a new alignment star: 1. 2. 3. 4. 5.
Locate and center the desired star in the eyepiece. Press the ALIGN key on the hand control. The display will then ask you which alignment star you want to replace. Use the UP and Down scroll keys to select the alignment star to be replaced. It is usually best to replace the star closest to the new star. This will space out your alignment stars across the sky. Press ENTER to make the change.
Object Catalog Selecting an Object Now that the telescope is properly aligned, you can choose an object from any of the catalogs in the NexStar's extensive database. The hand control has a key (4) designated for each of the catalogs in its database. There are two ways to select objects from the database: scrolling through the named object lists and entering object numbers. 1. Helpful Hint
Pressing the LIST key on the hand control will access all objects in the database that have common names or types. Each list is broken down into the following categories: Named Stars, Named Object, Double Stars, Variable Stars and Asterisms. Selecting any one of these options will display a numeric-alphabetical listing of the objects under that list. Pressing the Up and Down keys (10) allows you to scroll through the catalog to the desired object.
When scrolling through a long list of objects, holding down either the Up or Down key will allow you to scroll through the catalog at a rapid speed. 2. More Information
Pressing any of the other catalog keys (M, CALD, NGC, or STAR) will display a blinking cursor below the name of the catalog chosen. Use the numeric key pad to enter the number of any object within these standardized catalogs. For example, to find the Orion Nebula, press the "M" key and enter "042".
To download a list of all the stars contained in the STAR Catalog with SAO number cross references, logon to our web site at www.celestron.com and go to the NexStar page.
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Slewing to an Object Once the desired object is displayed in the hand control screen, you have two options:
1. Press the INFO Key. This will give you useful information about the selected object such as R.A. and declination, magnitude and most importantly, altitude above the horizon. (If a star alignment has not yet been performed, the altitude will not be displayed).
2. Press the ENTER Key. This will automatically slew the telescope to the coordinates of the object. Caution: Never slew the telescope when someone is looking into the eyepiece. The telescope can move at very fast slew speeds and may hit an observer in the eye. If you are in Alt-Az tracking mode and slew to an object that below the horizon, NexStar will notify you by scrolling the following message on the hand co\ntrol display, “Position requested is below horizon”. To cancel the slew, press the UNDO button. By pressing ENTER the NexStar will allow you to slew to objects below the horizon, however if you try to slew to an object below –45 degrees in altitude, the hand control will display the additional warning, “NexStar tube may hit base”. It is recommended that the slew be canceled by pressing UNDO rather than letting the tube come into contact with the telescope base. Object information can be obtained without having to do a star alignment. After the telescope is powered on, press the UNDO key. Pressing any of the catalog keys allows you to scroll through object lists or enter catalog numbers as described above. However, information such as R.A. and declination of planets and altitude above the horizon will not be displayed unless the telescope is first properly aligned. There are two special object catalogs which require the input of additional information before the NexStar can slew to the object; they are Planet and Tour:
Finding Planets Since the planets are not fixed points in the sky, but rather appear to move relative to the background stars, the NexStar needs to have time and date information before it can go to any solar system object. To locate the planets, press the PLANET key on the hand control. The on screen display will ask for the following information:
Date Time -
Enter the month, day and year of your observing session. Enter the current local time for your area. Select PM or AM. Choose between Standard time or Daylight Savings time. Select the time zone that you are observing from.
Once this information is entered, use the Up and Down keys to select the Planet that you wish to observe. Press ENTER. If AutoAlign was used to align the telescope, all the necessary information has already been entered into the hand control and you are ready to select a planet to observe.
Tour Mode
Observing Tip
The NexStar includes a tour feature which automatically allows the user to choose from a list of interesting objects based on the month in which you are observing. The Tour mode is activated by pressing the TOUR key (6) on the hand control. Once activated, simply use the scroll keys to select the current month and press ENTER. The NexStar will display from a list of the best objects to observe based on the month entered. To see information and data about the displayed object, press the INFO key. • To slew to the object displayed, press ENTER. • To see the next tour object, press the Up key. • When going through any of the object catalogs in the database, you can easily find out which objects are above the horizon and visible simply by pressing the INFO button when the desired object is displayed. This will display the objects altitude above the horizon based on the date and time entered. Pressing the UP button once will display any scrolling text associated with that object. The scrolling text can be viewed even if a star alignment has not been performed.
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Direction Buttons The NexStar has four direction buttons in the center of the hand control which control the telescope motion in altitude (up and down) and azimuth (left and right). The telescope can be controlled at nine different speed rates.
Rate Button Pressing the RATE key (11) allows you to instantly change the speed rate of the motors from high speed slew rate to precise guiding rate or anywhere in between. Each rate corresponds to a number on the hand controller key pad. The number 9 is the fastest rate (6º per second, depending on power source) and is used for slewing between objects and locating alignment stars. The number 1 on the hand control is the slowest rate (1x sidereal) and can be used for accurate centering of objects in the eyepiece and photographic guiding. To change the speed rate of the motors: • •
Press the RATE key on the hand control. The LCD will display the current speed rate. Press the number on the hand control that corresponds to the desired speed. The LCD will display "NexStar Ready" indicating that the rate has been changed.
The hand control has a "double button" feature that allows you to instantly speed up the motors without having to choose a speed rate. To use this feature, simply press the arrow button that corresponds to the direction that you want to move the telescope. While holding that button down, press the opposite directional button. This will increase the slew rate to approximately 1.5º per second (equal to rate 7 on the hand control). This feature will not function if the telescope is currently set at a speed rate of 8 or 9. The slower slew rates (6 and lower) move the motors in the opposite direction than the faster slew rates (8 and 9). This is done so that an object will move in the appropriate direction when looking into the eyepiece (i.e. pressing the right arrow button will move the star towards the right in the field of view of the eyepiece). However, if any of the slower slew rates (rate 6 and below) are used to center an object in the Star Pointer, you may need to press the opposite directional button to make the telescope move in the correct direction.
1 2 3 4 5
= = = = =
1x (sidereal) 2x 8x 16x 64x
6 7 8 9
= = = =
128x 1.5º / sec 3º / sec 6.5º / sec
Nine available slew speeds
Setup Procedures The NexStar contains many user defined setup functions designed to give the user control over the telescope's many advanced features. All of the setup and utility features can be accessed by pressing the MENU key and scrolling through the options:
Tracking Mode
This allows you to change the way the telescope tracks depending on the type of mount being used to support the telescope. The NexStar has three different tracking modes:
Alt-Az
This is the default tracking rate and is used when the telescope is placed on
a flat surface or tripod without the use of an equatorial wedge. The telescope must be aligned with two stars before it can track in Alt-Az. EQ North
Used to track the sky when the telescope is polar aligned using an equatorial wedge in the Northern Hemisphere.
EQ South
Used to track the sky when the telescope is polar aligned using an equatorial wedge in the Southern Hemisphere.
Off
When using the telescope for terrestrial (land) observation, the tracking can be turned off so that the telescope never moves.
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Tracking Rate
In addition to being able to move the telescope with the hand control buttons, the NexStar will continually track a celestial object as it moves across the night sky. The tracking rate can be changed depending on what type of object is being observed: Sidereal
Lunar
Date/Time -
This rate compensates for the rotation of the earth by moving the telescope at the same rate as the rotation of the earth, but in the opposite direction. When the telescope is polar aligned, this can be accomplished by moving the telescope in Right Ascension only. When mounted in AltAz mode, the telescope must make corrections in both R.A. and declination. Used for tracking the moon when observing the lunar landscape.
Solar
Used for tracking the Sun when solar observing.
King
As light passes through our atmosphere, atmospheric refraction affects the apparent motion of objects across the sky. The King rate takes this into account and compensates for the refraction of the atmosphere.
Allows you to update both the date and the time to improve pointing accuracy on many objects.
User Defined Objects The NexStar can store up to 25 different user defined objects in its memory. The objects can be daytime land objects or an interesting celestial object that you discover that is not included in the regular database. There are several ways to save an object to memory depending on what type of object it is: Save Sky Object:
The NexStar stores celestial objects to its database by saving its right ascension and declination in the sky. This way the same object can be found each time the telescope is aligned. Once a desired object is centered in the eyepiece, simply scroll to the "Save Save Sky Obj" command and press ENTER. The display will ask you to enter a number between 1-20 to identify the object. Press ENTER again to save this object to the database.
Save Land Object: The NexStar can also be used as a spotting scope on terrestrial objects. Fixed land objects can be stored by saving their altitude and azimuth relative to the location of the telescope at the time of observing. Since these objects are relative to the location of the telescope, they are only valid for that exact location. To save land objects, once again center the desired object in the eyepiece. Scroll down to the "Save Save Land Obj" Obj command and press ENTER. The display will ask you to enter a number between 21-25 to identify the object. Press ENTER again to save this object to the database. Enter R.A. - Dec:
You can also store a specific set of coordinates for an object just by entering the R.A. and declination for that object. Scroll to the "Enter Enter RARA-DEC DEC " command and press ENTER. The display will then ask you to enter first the R.A. and then the declination of the desired object.
GoTo Object:
To go to any of the user defined objects stored in the database, scroll down to "GoTo GoTo Obj" Obj and enter the number of the object you wish to select and press ENTER. NexStar will automatically retrieve the coordinates and slew to the object.
To replace the contents of any of the user defined objects, simply save a new object using one of the existing identification numbers; NexStar will replace the previous user defined object with the current one.
Get RA/DEC - Displays the right ascension and declination for the current position of the telescope. Get Alt-Az - Displays the relative altitude and azimuth for the current position of the telescope.
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Goto R.A/ Dec - Allows you to input a specific R.A. and declination and slew to it. Goto Alt-Az
Helpful Hint
- Allows you to enter a specific altitude and azimuth position and slew to it.
To store a set of coordinates (R.A./Dec) permanently into the NexStar database, save it as a User Defined Object as described above.
Utility Features Scrolling through the MENU options will also provide access to several advanced utility functions within the NexStar such as; motor demo, RS-232 interface, key pad light control, cord wrap and anti-backlash.
Demo - This feature will test both the altitude and azimuth motors by slewing to randomly chosen coordinates in the sky. RS-232 – The NexStar has an RS-232 port allowing it to communicate with many astronomy computer programs (such as The Sky by Software Bisque). Before attempting to create a link with a computer or laptop, go to the RS-232 option and press ENTER. Follow the connection procedures outlined by your software instructions. Light Control – This feature allows you to turn off both the red key pad light and LCD display for daytime use to conserve power and to help preserve your night vision.
Cord Wrap – Cord wrap safeguards against the telescope slewing more than 360º in azimuth and wrapping the power cord around the base of the telescope. By default, the cord wrap feature is active when the telescope is powered on. Cord wrap should be turned off when powering the NexStar with batteries.
Anti-backlash – All mechanical gears have a certain amount of backlash or play between the gears. This play is evident by how long it takes for a star to move in the eyepiece when the hand control arrow buttons are pressed (especially when changing directions). The NexStar's anti-backlash features allows the user to compensate for backlash by inputting a value which quickly rewinds the motors just enough to eliminate the play between gears. The amount of compensation needed depends on the slewing rate selected; the slower the slewing rate the longer it will take for the star to appear to move in the eyepiece. Therefore, the anti-backlash compensation will have to be set higher. You will need to experiment with different values; a value between 20 and 50 is usually best for most visual observing, whereas a higher value may be necessary for photographic guiding. To set the anti-backlash value, scroll down to the anti-backlash option and press ENTER. Enter a value from 0100 for both azimuth and altitude and press ENTER after each one to save these values. NexStar will remember these values and use them each time it is turned on until they are changed. Observing Tip
For the best possible pointing accuracy, always center the alignment stars using the up arrow button and the right arrow button. Approaching the star from this direction when looking through the eyepiece will eliminate much of the backlash between the gears and assure the most accurate alignment possible.
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N exS tar R eady M ENU T R ACK IN G M OD E
A L IG NM ENT
L IST
AU T O ALIG N
A L T -A Z E Q NO R TH EQ SO UTH O FF T R ACK IN G RAT E
P O IN T T U B E N O R T H & L E V E L
S ID E R E A L SO LAR LUNAR K IN G G E T RA-DE C G E T ALT -AZ G OT O RA-D E C G OT O ALT -AZ DEM O R S 2 32 U S E R OBJE C T S
S E L E C T L O C A T IO N
G O TO O B JE C T SAVE LAND OBJ SAVE SKY OBJ ENTER RA / DEC D AT E & T IM E LIG H T S ON/OFF D IS P L A Y O F F D IS P L A Y O N KEY PAD O FF KEY PAD ON C ORD W R AP
M M /DD/YY
... ... ...
NAM ED STA R NA M E D O B JE CT DO U BLE S TA R V A R IA B L E S T A R A S T E R IS M TO U R PLANETS
ENTE R LO NG / LAT ENTER LO NG ENTER LAT SA VE LO CATIO N
U S E R D E F IN E D E NT ER S AV ED LO CATIO N
T W O-S T AR ALIG NM E NT LEV EL TUBE S ELECT STA R 1 CENTER STA R 1 S ELECT STA R 2 CENTER STA R 2
POW ER CORD BATTE RY ANT I-BAC KLAS H
NexStar Menu Tree: The following figure is a menu tree showing the sub-menus associated with the primary command functions
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A telescope is an instrument that collects and focuses light. The nature of the optical design determines how the light is focused. Some telescopes, known as refractors, use lenses. Other telescopes, known as reflectors, use mirrors. The Schmidt-Cassegrain optical system (or Schmidt-Cass for short) uses a combination of mirrors and lenses and is referred to as a compound or catadioptric telescope. This unique design offers large-diameter optics while maintaining very short tube lengths, making them extremely portable. The Schmidt-Cassegrain system consists of a zero power corrector plate, a spherical primary mirror, and a secondary mirror. Once light rays enter the optical system, they travel the length of the optical tube three times.
Figure 5-1 A cutaway view of the light path of the Schmidt-Cassegrain optical design
The optics of the NexStar have Starbright coatings - enhanced multi-layer coatings on the primary and secondary mirrors for increased reflectivity and a fully coated corrector for the finest anti-reflection characteristics. Inside the optical tube, a black tube extends out from the center hole in the primary mirror. This is the primary baffle tube and it prevents stray light from passing through to the eyepiece or camera.
Image Orientation The image orientation changes depending on how the eyepiece is inserted into the telescope. When using the star diagonal, the image is right-side-up, but reversed from left-to-right (i.e., reverted). If inserting the eyepiece directly into the visual back (i.e., without the star diagonal), the image is upside-down and reversed from left-to-right (i.e., inverted). This is normal for the Schmidt-Cassegrain design.
Actual image orientation as seen with the unaided eye
Reversed from left to right, as viewed with a Star Diagonal Figure 5-2
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Inverted image, as viewed with the eyepiece directly in telescope
Focusing The NexStar's focusing mechanism controls the primary mirror which is mounted on a ring that slides back and forth on the primary baffle tube. The focusing knob, which moves the primary mirror, is on the rear cell of the telescope just below the star diagonal and eyepiece. Turn the focusing knob until the image is sharp. If the knob will not turn, it has reached the end of its travel on the focusing mechanism. Turn the knob in the opposite direction until the image is sharp. Once an image is in focus, turn the knob clockwise to focus on a closer object and counterclockwise for a more distant object. A single turn of the focusing knob moves the primary mirror only slightly. Therefore, it will take many turns (about 30) to go from close focus (approximately 25 feet) to infinity. For astronomical viewing, out of focus star images are very diffuse, making them difficult to see. If you turn the focus knob too quickly, you can go right through focus without seeing the image. To avoid this problem, your first astronomical target should be a bright object (like the Moon or a planet) so that the image is visible even when out of focus. Critical focusing is best accomplished when the focusing knob is turned in such a manner that the mirror moves against the pull of gravity. In doing so, any mirror shift is minimized. For astronomical observing, both visually and photographically, this is done by turning the focus knob counterclockwise.
Figure 5-3 The emblem on the end of the focus knob shows the correct rotational direction for focusing the NexStar.
Calculating Magnification You can change the power of your telescope just by changing the eyepiece (ocular). To determine the magnification of your telescope, simply divide the focal length of the telescope by the focal length of the eyepiece used. In equation format, the formula looks like this: Focal Length of Telescope (mm) Magnification = Focal Length of Eyepiece (mm) Let’s say, for example, you are using the 40mm Plossl eyepiece. To determine the magnification you simply divide the focal length of your telescope (the NexStar 8has a focal length of 2000mm) by the focal length of the eyepiece, 40mm. Dividing 2000 by 40 yields a magnification of 50 power. Although the power is variable, each instrument under average skies has a limit to the highest useful magnification. The general rule is that 60 power can be used for every inch of aperture. For example, the NexStar is 8" in diameter. Multiplying 8 by 60 gives a maximum useful magnification of 480 power. Although this is the maximum useful magnification, most observing is done in the range of 20 to 35 power for every inch of aperture which is 160 to 280 times for the NexStar 8 telescope.
Determining Field of View Determining the field of view is important if you want to get an idea of the angular size of the object you are observing. To calculate the actual field of view, divide the apparent field of the eyepiece (supplied by the eyepiece manufacturer) by the magnification. In equation format, the formula looks like this: Apparent Field of Eyepiece True Field = Magnification As you can see, before determining the field of view, you must calculate the magnification. Using the example in the previous section, we can determine the field of view using the same 40mm eyepiece. The 40mm Plossl eyepiece has an apparent field of view of 46°. Divide the 46° by the magnification, which is 50 power. This yields an actual field of .92°, or a little less than a full degree. To convert degrees to feet at 1,000 yards, which is more useful for terrestrial observing, simply multiply by 52.5. Continuing with our example, multiply the angular field .92° by 52.5. This produces a linear field width of 48.3 feet at a distance of one thousand yards. The apparent field of each eyepiece that Celestron manufactures is found in the Celestron Accessory Catalog (#93685).
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General Observing Hints When working with any optical instrument, there are a few things to remember to ensure you get the best possible image.
• • • •
Never look through window glass. Glass found in household windows is optically imperfect, and as a result, may vary in thickness from one part of a window to the next. This inconsistency can and will affect the ability to focus your telescope. In most cases you will not be able to achieve a truly sharp image, while in some cases, you may actually see a double image. Never look across or over objects that are producing heat waves. This includes asphalt parking lots on hot summer days or building rooftops. Hazy skies, fog, and mist can also make it difficult to focus when viewing terrestrially. The amount of detail seen under these conditions is greatly reduced. Also, when photographing under these conditions, the processed film may come out a little grainier than normal with lower contrast and underexposed. If you wear corrective lenses (specifically glasses), you may want to remove them when observing with an eyepiece attached to the telescope. When using a camera, however, you should always wear corrective lenses to ensure the sharpest possible focus. If you have astigmatism, corrective lenses must be worn at all times.
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Up to this point, this manual covered the assembly and basic operation of your NexStar telescope. However, to understand your telescope more thoroughly , you need to know a little about the night sky. This section deals with observational astronomy in general and includes information on the night sky and polar alignment.
The Celestial Coordinate System To help find objects in the sky, astronomers use a celestial coordinate system that is similar to our geographical coordinate system here on Earth. The celestial coordinate system has poles, lines of longitude and latitude, and an equator. For the most part, these remain fixed against the background stars. The celestial equator runs 360 degrees around the Earth and separates the northern celestial hemisphere from the southern. Like the Earth's equator, it bears a reading of zero degrees. On Earth this would be latitude. However, in the sky this is referred to as declination, or DEC for short. Lines of declination are named for their angular distance above and below the celestial equator. The lines are broken down into degrees, minutes of arc, and seconds of arc. Declination readings south of the equator carry a minus sign (-) in front of the coordinate and those north of the celestial equator are either blank (i.e., no designation) or preceded by a plus sign (+). The celestial equivalent of longitude is called Right Ascension, or R.A. for short. Like the Earth's lines of longitude, they run from pole to pole and are evenly spaced 15 degrees apart. Although the longitude lines are separated by an angular distance, they are also a measure of time. Each line of longitude is one hour apart from the next. Since the Earth rotates once every 24 hours, there are 24 lines total. As a result, the R.A. coordinates are marked off in units of time. It begins with an arbitrary point in the constellation of Pisces designated as 0 hours, 0 minutes, 0 seconds. All other points are designated by how far (i.e., how long) they lag behind this coordinate after it passes overhead moving toward the west.
Figure 6-1 The celestial sphere seen from the outside showing R.A. and DEC.
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Motion of the Stars The daily motion of the Sun across the sky is familiar to even the most casual observer. This daily trek is not the Sun moving as early astronomers thought, but the result of the Earth's rotation. The Earth's rotation also causes the stars to do the same, scribing out a large circle as the Earth completes one rotation. The size of the circular path a star follows depends on where it is in the sky. Stars near the celestial equator form the largest circles rising in the east and setting in the west. Moving toward the north celestial pole, the point around which the stars in the northern hemisphere appear to rotate, these circles become smaller. Stars in the mid-celestial latitudes rise in the northeast and set in the northwest. Stars at high celestial latitudes are always above the horizon, and are said to be circumpolar because they never rise and never set. You will never see the stars complete one circle because the sunlight during the day washes out the starlight. However, part of this circular motion of stars in this region of the sky can be seen by setting up a camera on a tripod and opening the shutter for a couple hours. The processed film will reveal semicircles that revolve around the pole. (This description of stellar motions also applies to the southern hemisphere except all stars south of the celestial equator move around the south celestial pole.)
Figure 6-2 All stars appear to rotate around the celestial poles. However, the appearance of this motion varies depending on where you are looking in the sky. Near the north celestial pole the stars scribe out recognizable circles centered on the pole (1). Stars near the celestial equator also follow circular paths around the pole. But, the complete path is interrupted by the horizon. These appear to rise in the east and set in the west (2). Looking toward the opposite pole, stars curve or arc in the opposite direction scribing a circle around the opposite pole (3).
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Polar Alignment (with optional Wedge) Even though the NexStar can precisely track a celestial object while in the Alt-Az position, it is still necessary to align the polar axis of the telescope (the fork arm) to the Earth's axis on rotation in order to do long exposure astro photography. To do an accurate polar alignment, the NexStar requires an optional equatorial wedge between the telescope and a tripod. This allows the telescope's tracking motors to rotate the telescope around the celestial pole, the same way as the stars. Without the equatorial wedge, you would notice the stars in the eyepiece would slowly rotate around the center of the field of view. Although this gradual rotation would go unnoticed when viewing with an eyepiece, it would be very noticeable on film. Polar alignment is the process by which the telescope's axis of rotation (called the polar axis) is aligned (made parallel) with the Earth's axis of rotation. Once aligned, a telescope with a clock drive will track the stars as they move across the sky. The result is that objects observed through the telescope appear stationary (i.e., they will not drift out of the field of view). If not using the clock drive, all objects in the sky (day or night) will slowly drift out of the field. This motion is caused by the Earth's rotation. To align your NexStar on an equatorial wedge, it will be necessary to use the 2-star alignment method. When asked to level the telescope tube, use the hand control arrows buttons to position the tube prependicular (90º) to the fork arm. Then continue to follow the alignment procedure as described in the Hand Control section of this manual. Whether you are using your NexStar in the Alt-Az configuration or polar aligned, it will be necessary to locate where north is and more specifically where the North Star is. Definition The polar axis is the axis around which the telescope rotates when moved in right ascension. This axis points the same direction even when the telescope moves in right ascension and declination.
Figure 6-3 This is how the telescope is to be set up for polar alignment. The tube should be parallel to the fork arm and the mount should point to Polaris.
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Finding the North Celestial Pole In each hemisphere, there is a point in the sky around which all the other stars appear to rotate. These points are called the celestial poles and are named for the hemisphere in which they reside. For example, in the northern hemisphere all stars move around the north celestial pole. When the telescope's polar axis is pointed at the celestial pole, it is parallel to the Earth's rotational axis.
Figure 6-4 – The position of the Big Dipper changes throughout the year and the night.
Definition
Many methods of polar alignment require that you know how to find the celestial pole by identifying stars in the area. For those in the northern hemisphere, finding the celestial pole is not too difficult. Fortunately, we have a naked eye star less than a degree away. This star, Polaris, is the end star in the handle of the Little Dipper. Since the Little Dipper (technically called Ursa Minor) is not one of the brightest constellations in the sky, it may be difficult to locate from urban areas. If this is the case, use the two end stars in the bowl of the Big Dipper (the pointer stars). Draw an imaginary line through them toward the Little Dipper. They point to Polaris (see Figure 6-5). The position of the Big Dipper changes during the year and throughout the course of the night (see Figure 6-4). When the Big Dipper is low in the sky (i.e., near the horizon), it may be difficult to locate. During these times, look for Cassiopeia (see Figure 6-5). Observers in the southern hemisphere are not as fortunate as those in the northern hemisphere. The stars around the south celestial pole are not nearly as bright as those around the north. The closest star that is relatively bright is Sigma Octantis. This star is just within naked eye limit (magnitude 5.5) and lies about 59 arc minutes from the pole.
The north celestial pole is the point in the northern hemisphere around which all stars appear to rotate. The counterpart in the southern hemisphere is referred to as the south celestial pole.
Figure 6-5 The two stars in the front of the bowl of the Big Dipper point to Polaris which is less than one degree from the true (north) celestial pole. Cassiopeia, the “W” shaped constellation, is on the opposite side of the pole from the Big Dipper. The North Celestial Pole (N.C.P.) is marked by the “+” sign.
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With your telescope set up, you are ready to use it for observing. This section covers visual observing hints for both solar system and deep sky objects as well as general observing conditions which will affect your ability to observe.
Observing the Moon Often, it is tempting to look at the Moon when it is full. At this time, the face we see is fully illuminated and its light can be overpowering. In addition, little or no contrast can be seen during this phase. One of the best times to observe the Moon is during its partial phases (around the time of first or third quarter). Long shadows reveal a great amount of detail on the lunar surface. At low power you will be able to see most of the lunar disk at one time. The optional Reducer/Corrector lens allows for breath-taking views of the entire lunar disk when used with a low power eyepiece. Change to higher power (magnification) to focus in on a smaller area. Choose the lunar tracking rate from the NexStar's MENU tracking rate options to keep the moon centered in the eyepiece even at high magnifications.
Lunar Observing Hints To increase contrast and bring out detail on the lunar surface, use filters. A yellow filter works well at improving contrast while a neutral density or polarizing filter will reduce overall surface brightness and glare.
Observing the Planets Other fascinating targets include the five naked eye planets. You can see Venus go through its lunar-like phases. Mars can reveal a host of surface detail and one, if not both, of its polar caps. You will be able to see the cloud belts of Jupiter and the great Red Spot (if it is visible at the time you are observing). In addition, you will also be able to see the moons of Jupiter as they orbit the giant planet. Saturn, with its beautiful rings, is easily visible at moderate power. Planetary Observing Hints Remember that atmospheric conditions are usually the • limiting factor on how much planetary detail will be visible. So, avoid observing the planets when they are low on the horizon or when they are directly over a source of radiating heat, such as a rooftop or chimney. See the "Seeing Conditions" section later in this section. To increase contrast and bring out detail on the planetary surface, try using Celestron eyepiece filters. •
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Observing the Sun Although overlooked by many amateur astronomers, solar observation is both rewarding and fun. However, because the Sun is so bright, special precautions must be taken when observing our star so as not to damage your eyes or your telescope. Never project an image of the Sun through the telescope. Because of the folded optical design, tremendous heat buildup will result inside the optical tube. This can damage the telescope and/or any accessories attached to the telescope. For safe solar viewing, use a solar filter that reduces the intensity of the Sun's light, making it safe to view. With a filter you can see sunspots as they move across the solar disk and faculae, which are bright patches seen near the Sun's edge. Solar Observing Hints •
The best time to observe the Sun is in the early morning or late afternoon when the air is cooler.
•
To center the Sun without looking into the eyepiece, watch the shadow of the telescope tube until it forms a circular shadow.
•
To ensure accurate tracking, be sure to select solar tracking rate.
Observing Deep Sky Objects Deep-sky objects are simply those objects outside the boundaries of our solar system. They include star clusters, planetary nebulae, diffuse nebulae, double stars and other galaxies outside our own Milky Way. Most deep-sky objects have a large angular size. Therefore, low-to-moderate power is all you need to see them. Visually, they are too faint to reveal any of the color seen in long exposure photographs. Instead, they appear black and white. And, because of their low surface brightness, they should be observed from a dark-sky location. Light pollution around large urban areas washes out most nebulae making them difficult, if not impossible, to observe. Light Pollution Reduction filters help reduce the background sky brightness, thus increasing contrast.
Seeing Conditions Viewing conditions affect what you can see through your telescope during an observing session. Conditions include transparency, sky illumination, and seeing. Understanding viewing conditions and the effect they have on observing will help you get the most out of your telescope.
Transparency Transparency is the clarity of the atmosphere which is affected by clouds, moisture, and other airborne particles. Thick cumulus clouds are completely opaque while cirrus can be thin, allowing the light from the brightest stars through. Hazy skies absorb more light than clear skies making fainter objects harder to see and reducing contrast on brighter objects. Aerosols ejected into the upper atmosphere from volcanic eruptions also affect transparency. Ideal conditions are when the night sky is inky black.
Sky Illumination General sky brightening caused by the Moon, aurorae, natural airglow, and light pollution greatly affect transparency. While not a problem for the brighter stars and planets, bright skies reduce the contrast of extended nebulae making them difficult, if not impossible, to see. To maximize your observing, limit deep sky viewing to moonless nights far from the light polluted skies found around major urban areas. LPR filters enhance deep sky viewing from light polluted areas by blocking unwanted light while transmitting light from certain deep sky objects. You can, on the other hand, observe planets and stars from light polluted areas or when the Moon is out.
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Seeing Seeing conditions refers to the stability of the atmosphere and directly affects the amount of fine detail seen in extended objects. The air in our atmosphere acts as a lens which bends and distorts incoming light rays. The amount of bending depends on air density. Varying temperature layers have different densities and, therefore, bend light differently. Light rays from the same object arrive slightly displaced creating an imperfect or smeared image. These atmospheric disturbances vary from time-to-time and place-to-place. The size of the air parcels compared to your aperture determines the "seeing" quality. Under good seeing conditions, fine detail is visible on the brighter planets like Jupiter and Mars, and stars are pinpoint images. Under poor seeing conditions, images are blurred and stars appear as blobs. The conditions described here apply to both visual and photographic observations.
Figure 7-1 Seeing conditions directly affect image quality. These drawing represent a point source (i.e., star) under bad seeing conditions (left) to excellent conditions (right). Most often, seeing conditions produce images that lie some where between these two extremes.
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After looking at the night sky for a while you may want to try photographing it. Several forms of celestial photography are possible with your telescope, including short exposure prime focus, eyepiece projection, long exposure deep sky, terrestrial and even CCD imaging. Each of these is discussed in moderate detail with enough information to get you started. Topics include the accessories required and some simple techniques. More information is available in some of the publications listed at the end of this manual. In addition to the specific accessories required for each type of celestial photography, there is the need for a camera but not just any camera. The camera does not have to have many of the features offered on today's state-of-the-art equipment. For example, you don't need auto focus capability or mirror lock up. Here are the mandatory features a camera needs for celestial photography. First, a “B” setting which allows for time exposures. This excludes point and shoot cameras and limits the selection to SLR cameras, the most common type of 35mm camera on the market today. Second, the “B” or manual setting should NOT run off the battery. Many new electronic cameras use the battery to keep the shutter open during time exposures. Once the batteries are drained, usually after a few minutes, the shutter closes, whether you were finished with the exposure or not. Look for a camera that has a manual shutter when operating in the time exposure mode. Olympus, Nikon, Minolta, Pentax, Canon and others have made such camera bodies. The camera must have interchangeable lenses so you can attach it to the telescope and so you can use a variety of lenses for piggyback photography. If you can't find a new camera, you can purchase a used camera body that is not 100-percent functional. The light meter, for example, does not have to be operational since you will be determining the exposure length manually. You also need a cable release with a locking function to hold the shutter open while you do other things. Mechanical and air release models are available.
Short Exposure Prime Focus Photography Short exposure prime focus photography is the best way to begin recording celestial objects. It is done with the camera attached to the telescope without an eyepiece or camera lens in place. To attach your camera you need the Celestron TAdapter (#93633-A) and a T-Ring for your specific camera (i.e., Minolta, Nikon, Pentax, etc.). The T-Ring replaces the 35mm SLR camera's normal lens. Prime focus photography allows you to capture the majority of the lunar disk or solar disk. To attach your camera to your telescope. 1.
Remove all visual accessories.
2.
Thread the T-Ring onto the T-Adapter.
3.
Mount your camera body onto the T-Ring the same as you would any other lens.
4.
Thread the T-Adapter onto the back of the telescope while holding the camera in the desired orientation (either vertical or horizontal).
With your camera attached to the telescope, you are ready for prime focus photography. Start with an easy object like the Moon. Here's how to do it: 1.
Load your camera with film that has a moderate-to-fast speed (i.e., ISO rating). Faster films are more desirable when the Moon is a crescent. When the Moon is near full, and at its brightest, slower films are more desirable. Here are some film recommendations:
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• • • • •
T-Max 100 T-Max 400 Any 100 to 400 ISO color slide film Fuji Super HG 400 Ektar 25 or 100
1.
Center the Moon in the field of your NexStar telescope.
2.
Focus the telescope by turning the focus knob until the image is sharp.
3.
Set the shutter speed to the appropriate setting (see table below).
4.
Trip the shutter using a cable release.
5.
Advance the film and repeat the process. Lunar Phase Crescent Quarter Full
ISO 50 1/2 1/15 1/30
ISO 100 1/4 1/30 1/60
ISO 200 1/8 1/60 1/125
ISO 400 1/15 1/125 1/250
Table 8-1 Above is a listing of recommended exposure times when photographing the Moon at the prime focus of your NexStar telescope.
The exposure times listed in table 8-1 should be used as a starting point. Always make exposures that are longer and shorter than the recommended time. Also, take a few photos at each shutter speed. This will ensure that you will get a good photo. If using black and white film, try a yellow filter to reduce the light intensity and to increase contrast. Keep accurate records of your exposures. This information is useful if you want to repeat your results or if you want to submit some of your photos to various astronomy magazines for possible publication! This technique is also used for photographing the Sun with the proper solar filter.
Eyepiece Projection This form of celestial photography is designed for objects with small angular sizes, primarily the Moon and planets. Planets, although physically quite large, appear small in angular size because of their great distances. Moderate to high magnification is, therefore, required to make the image large enough to see any detail. Unfortunately, the camera/telescope combination alone does not provide enough magnification to produce a usable image size on film. In order to get the image large enough, you must attach your camera to the telescope with the eyepiece in place. To do so, you need two additional accessories; a deluxe tele-extender (#93643), which attaches to the visual back, and a T-ring for your particular camera make (i.e., Minolta, Nikon, Pentax, etc.). Because of the high magnifications during eyepiece projection, the field of view is quite small which makes it difficult to find and center objects. To make the job a little easier, align the finder as accurately as possible. This allows you to get the object in the telescope's field based on the finder's view alone. Another problem introduced by the high magnification is vibration. Simply tripping the shutter even with a cable release produces enough vibration to smear the image. To get around this, use the camera's self-timer if the exposure time is less than one second a common occurrence when photographing the Moon. For exposures over one second, use the "hat trick." This technique incorporates a hand-held black card placed over the aperture of the telescope to act as a shutter. The card prevents light from entering the telescope while the shutter is released. Once the shutter has been released and the vibration has diminished (a few seconds), move the black card out of the way to expose the film. After the exposure is complete, place the card over the front of the telescope and close the shutter. Advance the film and you're ready for your next shot. Keep in mind that the card should be held a few inches in front of the telescope, and not touching it. It is easier if you use two people for this process; one to release the camera shutter and one to hold the card. Here's the process for making the exposure.
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1.
Find and center the desired target in the viewfinder of your camera.
2.
Turn the focus knob until the image is as sharp as possible.
3.
Place the black card over the front of the telescope.
4.
Release the shutter using a cable release.
5.
Wait for the vibration caused by releasing the shutter to diminish. Also, wait for a moment of good seeing.
6.
Remove the black card from in front of the telescope for the duration of the exposure (see accompanying table).
7.
Replace the black card over the front of the telescope.
8.
Close the camera's shutter.
Advance the film and you are ready for your next exposure. Don't forget to take photos of varying duration and keep accurate records of what you have done. Record the date, telescope, exposure duration, eyepiece, f/ratio, film, and some comments on the seeing conditions. The following table lists exposures for eyepiece projection with a 10mm eyepiece. All exposure times are listed in seconds or fractions of a second. Planet Moon Mercury Venus Mars Jupiter Saturn
ISO 50 4 16 1/2 16 8 16
ISO 100 2 8 1/4 8 4 8
ISO 200 1 4 1/8 4 2 4
ISO 400 1/2 2 1/15 2 1 2
Table 8-2 Recommended exposure time for photographing planets.
The exposure times listed here should be used as a starting point. Always make exposures that are longer and shorter than the recommended time. Also, take a few photos at each shutter speed. This will ensure that you get a good photo. It is not uncommon to go through an entire roll of 36 exposures and have only one good shot. NOTE: Don't expect to record more detail than you can see visually in the eyepiece at the time you are photographing. Once you have mastered the technique, experiment with different films, different focal length eyepieces, and even different filters.
Long Exposure Prime Focus Photography This is the last form of celestial photography to be attempted after others have been mastered. It is intended primarily for deep sky objects, that is objects outside our solar system which includes star clusters, nebulae, and galaxies. While it may seem that high magnification is required for these objects, just the opposite is true. Most of these objects cover large angular areas and fit nicely into the prime focus field of your telescope. The brightness of these objects, however, requires long exposure times and, as a result, are rather difficult. There are several techniques for this type of photography, and the one chosen will determine the standard accessories needed. The best method for long exposure deep sky astro photography is with an off-axis guider. This device allows you to photograph and guide through the telescope simultaneously. Celestron offers a very special and advanced offaxis guider, called the Radial Guider (#94176). In addition, you will need a T-Ring to attach your camera to the Radial Guider. Other equipment needs include a guiding eyepiece. Unlike other forms of astro photography which allows for fairly loose guiding, prime focus requires meticulous guiding for long periods. To accomplish this you need a guiding ocular
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with an illuminated reticle to monitor your guide star. For this purpose, Celestron offers the Micro Guide Eyepiece (#94171) Here is a brief summary of the technique. 1.
Polar align the telescope using an optional equatorial wedge.
2.
Remove all visual accessories.
3.
Thread the Radial Guider onto your telescope.
4.
Thread the T-Ring onto the Radial Guider.
5.
Mount your camera body onto the T-Ring the same as you would any other lens.
6.
Set the shutter speed to the "B" setting.
7.
Focus the telescope on a star.
8.
Center your subject in the field of your camera.
9.
Find a suitable guide star in the telescope field. This can be the most time consuming process.
10. Open the shutter using a cable release. 11. Monitor your guide star for the duration of the exposure using the buttons on the hand controller to make the needed corrections. 12. Close the camera's shutter. When getting started, use fast films to record as much detail in the shortest possible time. recommendations: • • • • • • •
Here are proven
Ektar 1000 (color print) Konica 3200 (color print) Fujichrome 1600D (color slide) 3M 1000 (color slide) Scotchchrome 400 T-Max 3200 (black and white print) T-Max 400 (black and white print)
As you perfect your technique, try specialized films, that is films that are designed or specially treated for celestial photography. Here are some popular choices: • • • •
Ektar 125 (color print) Fujichrome 100D (color slide) Tech Pan, gas hypered (black and white print) T-Max 400 (black and white print)
There is no exposure determination table to help you get started. The best way to determine exposure length is look at previously published photos to see what film/exposure combinations were used. Or take unguided sample photos of various parts of the sky while the drive is running. Always take exposures of various lengths to determine the best exposure time.
Terrestrial Photography Your NexStar makes an excellent 2000mm telephoto lens for terrestrial (land) photography. Terrestrial photography is best done will the telescope in Alt-Az configuration and the tracking drive turned off. To turn the tracking drive off, press the MENU (9) button on the hand control and scroll down to the Tracking Mode sub menu. Use the Up and Down scroll keys (10) to select the Off option and press ENTER. This will turn the tracking motors off, so that objects will remain in your camera's field of view.
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Metering The NexStar has a fixed aperture and, as a result, fixed f/ratios. To properly expose your subjects photographically, you need to set your shutter speed accordingly. Most 35mm SLR cameras offer through-the-lens metering which lets you know if your picture is under or overexposed. Adjustments for proper exposures are made by changing the shutter speed. Consult your camera manual for specific information on metering and changing shutter speeds.
Reducing Vibration Releasing the shutter manually can cause vibrations, producing blurred photos. To reduce vibration when tripping the shutter, use a cable release. A cable release keeps your hands clear of the camera and lens, thus eliminating the possibility of introducing vibration. Mechanical shutter releases can be used, though air-type releases are best. Blurry pictures can also result from shutter speeds that are too slow. To prevent this, use films that produce shutter speeds greater than 1/250 of a second when hand-holding the lens. If the lens is mounted on a tripod, the exposure length is virtually unlimited. Another way to reduce vibration is with the Vibration Suppression Pads (#93503). These pads rest between the ground and tripod feet. They reduce the vibration amplitude and vibration time.
CCD Imaging CCD Imaging is the most challenging form of astro photography and involves the use of a CCD (Charged Coupled Device) camera attached to the telescope at prime focus. The benefits of CCD imaging is the extreme light sensitivity of the electronic chip inside the camera. This allows you to record much fainter detail in a shorter period of time than would be possible with film photography. Due to the relative small size of the CCD chip, the field of view when imaging will be less than the field of view of a film camera. Using Celestron's optional f/6.3 Reducer/Corrector accessory in conjunction with a CCD camera (or film camera) will greatly increase the photographic field of view and will make finding and tracking a celestial object much easier.
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While your NexStar telescope requires little maintenance, there are a few things to remember that will ensure your telescope performs at its best.
Care and Cleaning of the Optics Occasionally, dust and/or moisture may build up on the corrector plate of your telescope. Special care should be taken when cleaning any instrument so as not to damage the optics. If dust has built up on the corrector plate, remove it with a brush (made of camel’s hair) or a can of pressurized air. Spray at an angle to the lens for approximately two to four seconds. Then, use an optical cleaning solution and white tissue paper to remove any remaining debris. Apply the solution to the tissue and then apply the tissue paper to the lens. Low pressure strokes should go from the center of the corrector to the outer portion. Do NOT rub in circles! You can use a commercially made lens cleaner or mix your own. A good cleaning solution is isopropyl alcohol mixed with distilled water. The solution should be 60% isopropyl alcohol and 40% distilled water. Or, liquid dish soap diluted with water (a couple of drops per one quart of water) can be used. Occasionally, you may experience dew build-up on the corrector plate of your telescope during an observing session. If you want to continue observing, the dew must be removed, either with a hair dryer (on low setting) or by pointing the telescope at the ground until the dew has evaporated. If moisture condenses on the inside of the corrector, remove the accessories from the rear cell of the telescope. Place the telescope in a dust-free environment and point it down. This will remove the moisture from the telescope tube. To minimize the need to clean your telescope, replace all lens covers once you have finished using it. Since the rear cell is NOT sealed, the cover should be placed over the opening when not in use. This will prevent contaminants from entering the optical tube. Internal adjustments and cleaning should be done only by the Celestron repair department. If your telescope is in need of internal cleaning, please call the factory for a return authorization number and price quote.
Collimation Corrector Plate
Collimation Screws
Figure 9-1 The three collimation screws are located on the secondary mirror holder in the center of the corrector plate.
The optical performance of your NexStar telescope is directly related to its collimation, that is the alignment of its optical system. Your NexStar was collimated at the factory after it was completely assembled. However, if the telescope is dropped or jarred severely during transport, it may have to be collimated. The only optical element that may need to be adjusted, or is possible, is the tilt of the secondary mirror. To check the collimation of your telescope you will need a light source. A bright star near the zenith is ideal since there is a minimal amount of atmospheric distortion. Make sure that tracking is on so that you won’t have to manually track the star. Or, if you do not want to power up your telescope, you can use Polaris. Its position relative to the celestial pole means that it moves very little thus eliminating the need to manually track it. Before you begin the collimation process, be sure that your telescope is in thermal equilibrium with the surroundings. Allow 45 minutes for the telescope to reach equilibrium if you move it between large temperature extremes.
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To verify collimation, view a star near the zenith. Use a medium to high power ocular — 12mm to 6mm focal length. It is important to center a star in the center of the field to judge collimation. Slowly cross in and out of focus and judge the symmetry of the star. If you see a systematic skewing of the star to one side, then recollimation is needed.
Figure 9-2 -- Even though the star pattern appears the same on both sides of focus, they are asymmetric. The dark obstruction is skewed off to the left side of the diffraction pattern indicating poor collimation.
To accomplish this, you need to tighten the secondary collimation screw(s) that move the star across the field toward the direction of the skewed light. These screws are located in the secondary mirror holder (see figure 9-1). To access the collimation screws you will need to remove the cap that covers the secondary mirror holder. To remove the cap, gently slide a flat head screw driver underneath one end of the cap and twist the screw driver. Slide the screw driver underneath the other side of the cap and twist until the cap comes off. Make only a small 1/6 to 1/8 adjustments to the collimation screws and re-center the star by moving the scope before making any improvements or before making further adjustments. To make collimation a simple procedure, follow these easy steps: 1.
While looking through a medium to high power eyepiece, de-focus a bright star until a ring pattern with a dark shadow appears (see figure 9-2). Center the de-focused star and notice in which direction the central shadow is skewed.
2.
Place your finger along the edge of the front cell of the telescope (be careful not to touch the corrector plate), pointing towards the collimation screws. The shadow of your finger should be visible when looking into the eyepiece. Rotate your finger around the tube edge until its shadow is seen closest to the narrowest portion of the rings (i.e. the same direction in which the central shadow is skewed).
3.
Locate the collimation screw closest to where your finger is positioned. This will be the collimation screw you will need to adjust first. (If your finger is positioned exactly between two of the collimation screws, then you will need to adjust the screw opposite where your finger is located).
4.
Use the hand control buttons to move the de-focused star image to the edge of the field of view, in the same direction that the central obstruction of the star image is skewed.
5.
While looking through the eyepiece, use an Allen wrench to turn the collimation screw you located in step 2 and 3. Usually a tenth of a turn is enough to notice a change in collimation. If the star image moves out of the field of view in the direction that the central shadow is skewed, than you are turning the collimation screw the wrong way. Turn the screw in the opposite direction, so that the star image is moving towards the center of the field of view. 6.
7. Figure 9-3 A collimated telescope should appear symmetrical with the central obstruction centered in the star's diffraction pattern.
If while turning you notice that the screws get very loose, then simply tighten the other two screws by the same amount. Conversely, if the collimation screw gets too tight, then loosen the other two screws by the same amount. Once the star image is in the center of the field of view, check to see if the rings are concentric. If the central obstruction is still skewed in the same direction, then continue turning the screw(s) in the same direction. If you find that the ring pattern is skewed in a different direction, than simply repeat steps 2 through 6 as described above for the new direction.
Perfect collimation will yield a star image very symmetrical just inside and outside of focus. In addition, perfect collimation delivers the optimal optical performance specifications that your telescope is built to achieve.
If seeing (i.e., air steadiness) is turbulent, collimation is difficult to judge. Wait until a better night if it is turbulent or aim to a steadier part of the sky. A steadier part of the sky is judged by steady versus twinkling stars.
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You will find that additional accessories enhance your viewing pleasure and expand the usefulness of your telescope. For ease of reference, all the accessories are listed in alphabetical order. Adapter, Car Battery (#18769) -
Celestron offers the Car Battery Adapter that allows you to run the NexStar drive off an external power source. The adapter attaches to the cigarette lighter of your car, truck, van, or motorcycle. Barlow Lens - A Barlow lens is a negative lens that increases the focal length of a telescope. Used with any eyepiece, it doubles the magnification of that eyepiece. Celestron offers two Barlow lens in the 1-1/4" size for the NexStar. The 2x Ultima Barlow (#93506) is a compact triplet design that is fully multicoated for maximum light transmission and parfocal when used with the Ultima eyepieces. Model #93507 is a compact achromatic Barlow lens that is under three inches long and weighs only 4 oz. It works very well with all Celestron eyepieces.
Carrying Case (#302070) - This rugged case is constructed of space age resin, making it waterproof, unbreakable, airtight and extremely durable. It’s designed so your telescope can be packed with the standard finderscope in place, a convenience you’ll be sure to appreciate. The case is lined with die cut foam for custom fitting. It features large handles and is equipped with wheels, for easy transportation. Weight: 17 lbs. (31.5"x 21.75"x 11.5").
CD-ROM (#93700) - Celestron and Software Bisque have joined together to present this comprehensive CD-ROM called The Sky™ Level 1 - from Celestron. It features a 10,000 object database, 75 color images, horizontal projection, custom sky chart printing, zoom capability and more! A fun, useful and educational product. PC format.
Erect Image Diagonal (#94112-A) - This accessory is an Amici prism arrangement that allows you to look into the telescope at a 45° angle with images that are oriented properly (upright and correct from left-to-right). It is useful for daytime, terrestrial viewing. Eyepieces - Like telescopes, eyepieces come in a variety of designs. Each design has its own advantages and disadvantages. For the 1-1/4" barrel diameter there are four different eyepiece designs available. • Super Modified Achromatic (SMA) Eyepieces: 11/4" The SMA design is an improved version of the Kellner eyepiece. SMAs are very good, economical, general purpose eyepieces that deliver a wide apparent field, good color correction and an excellent image at the center of the field of view. Celestron offers SMA eyepieces in 1-1/4" sizes in the following focal lengths: 6mm, 10mm, 12mm, 17mm and 25mm.
• Ultima - Ultima is not really a design, but a trade name for our 5-element, wide field eyepieces. In the 1-1/4" barrel diameter, they are available in the following focal lengths: 5mm, 7.5mm, 12.5mm, 18mm, 24mm, 30mm, 35mm, and 42mm. These eyepieces are all parfocal. The 35mm Ultima gives the widest possible field of view with a 1-1/4" diagonal and is ideal for the NexStar with or without the Reducer/Corrector.
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• NexStar Plössl - Plössl eyepieces have a 4-element lens designed for low-to-high power observing. The Plössls offer razor sharp views across the entire field, even at the edges! In the 1-1/4" barrel diameter, they are available in the following focal lengths: 3.6mm, 6mm, 8mm, 10mm, 13mm, 17mm, 25mm, 32mm and 40mm. • Lanthanum Eyepieces (LV Series) - Lanthanum is a unique rare earth glass used in one of the field lenses of this new eyepiece. The Lanthanum glass reduces aberrations to a minimum. All are fully multicoated and have an astounding 20mm of eye relief — perfect for eyeglass wearers! In the 11/4" barrel diameter, they are available in the following focal lengths: 2.5mm, 4mm, 5mm, 6mm, 9mm, 10mm, 12mm and 15mm. Celestron also offers the LV Zoom eyepiece (#3777) with a focal length of 8mm to 24mm. It offers an apparent field of 40º at 24mm and 60º at 8mm. Eye relief ranges from 15mm to 19mm. Eyepiece Filters - To enhance your visual observations of solar system objects, Celestron offers a wide range of colored filters that thread into the 1-1/4" oculars. Available individually are: #12 deep yellow, #21 orange, #25 red, #58 green, #80A light blue, #96 neutral density - 25%T, #96 neutral density - 13%T, and polarizing. These and other filters are also sold in sets. Night Vision Flashlight - (#93588) - Celestron’s premium model for astronomy, using two red LEDs to preserve night vision better than red filters or other devices. Brightness is adjustable. Operates on a single 9 volt battery (included). Red Astro Lite – (#93590) – An economical squeeze-type flashlight fitted with a red cap to help preserve your night vision. Remove the red cap for normal flashlight operation. Very compact size and handy keychain. Light Pollution Reduction (LPR) Filters - These filters are designed to enhance your views of deep sky astronomical objects when viewed from urban areas. LPR Filters selectively reduce the transmission of certain wavelengths of light, specifically those produced by artificial lights. This includes mercury and high and low pressure sodium vapor lights. In addition, they also block unwanted natural light (sky glow) caused by neutral oxygen emission in our atmosphere. Celestron offers a model for 1-1/4" eyepieces (#94126A) and a model that attaches to the rear cell ahead of the star diagonal and visual back (#94127A). Micro Guide Eyepiece (#94171) - This multipurpose 12.5mm illuminated reticle can be used for guiding deep-sky astrophotos, measuring position angles, angular separations, and more. The laser etched reticle provides razor sharp lines and the variable brightness illuminator is completely cordless. The micro guide eyepiece produces 100 power when used with the NexStar at f/10. Moon Filters (#94119-A) - Celestron’s Moon Filters is an economical eyepiece filter for reducing the brightness of the moon and improving contrast, so greater detail can be observed on the lunar surface. The clear aperture is 21mm and the transmission is about 18%. Planisphere (#93720) - A simple and inexpensive tool for all levels of observers, from naked eye viewers to users of highly sophisticated telescopes. The Celestron Planisphere makes it easy to locate stars for observing and is a great planet finder as well. A map of the night sky, oriented by month and day, rotates within a depiction of the 24 hours of the day, to display exactly which stars and planets will be visible at any given time. Ingeniously simple to use, yet quite effective. Made of durable materials and coated for added protection. Celestron Planispheres come in three different models, to match the latitude from which you’re observing: For 20° to 40° of latitude For 30° to 50°of latitude For 40° to 60° of latitude
#93720-30 #93720-40 #93720-50
Polarizing Filter Set (#93608) - The polarizing filter set limits the transmission of light to a specific plane, thus increasing contrast between various objects. This is used primarily for terrestrial, lunar and planetary observing.
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Radial Guider (#94176) - The Celestron Radial Guider® is specifically designed for use in prime focus, deep sky stro photography and takes the place of the T-Adapter. This device allows you to photograph and guide simultaneously through the optical tube assembly of your telescope. This type of guiding produces the best results since what you see through the guiding eyepiece is exactly reproduced on the processed film. The Radial Guider is a “T”-shaped assembly that attaches to the rear cell of the telescope. As light from the telescope enters the guider, most passes straight through to the camera. A small portion, however, is diverted by a prism at an adjustable angle up to the guiding eyepiece. This guider has two features not found on other off-axis guiders; first, the prism and eyepiece housing rotate independently of the camera orientation making the acquisition of a guide star quite easy. Second, the prism angle is tunable allowing you to look at guide stars on-axis. This accessory works especially well with the Reducer/Corrector. Reducer/Corrector (#94175) - This lens reduces the focal length of the telescope by 37%, making your NexStar a 787.5mm f/6.3 instrument. In addition, this unique lens also corrects inherent aberrations to produce crisp images all the way across the field when used visually. When used photographically, there is some vignetting that produces a 26mm circular image on the processed film. It also increases the field of view significantly and is ideal for wide-field, deep-space viewing. It is also perfect for beginning prime focus, long-exposure astro photography when used with the radial guider. It makes guiding easier and exposures much shorter. Sky Maps (#93722) - Celestron Sky Maps are the ideal teaching guide for learning the night sky. You wouldn’t set off on a road trip without a road map, and you don’t need to try to navigate the night sky without a map either. Even if you already know your way around the major constellations, these maps can help you locate all kinds of fascinating objects. Skylight Filter (#93621) - The Skylight Filter is used on the Celestron NexStar telescope as a dust seal. The filter threads onto the rear cell of your telescope. All other accessories, both visual and photographic (with the exception of Barlow lenses), thread onto the skylight filter. The light loss caused by this filter is minimal. Solar Filter (#94162) - The AstroSolar® filter is a safe and durable filter that covers the front opening of the telescope. View sunspots and other solar features using this double-sided metal coated filter for uniform density and good color balance across the entire field. The Sun offers constant changes and will keep your observing interesting and fun. T-Adapter (#93633-A) - T-Adapter (with additional T-Ring) allows you to attach your SLR camera to the rear cell of your Celestron NexStar. This turns your NexStar into a 2000mm telephoto lens perfect for terrestrial photography and short exposure lunar and filtered solar photography. T-Ring - The T-Ring couples your 35mm SLR camera body to the T-Adapter, radial guider, or tele-extender. This accessory is mandatory if you want to do photography through the telescope. Each camera make (i.e., Minolta, Nikon, Pentax, etc.) has its own unique mount and therefore, its own T-Ring. Celestron has 8 different models for 35mm cameras. Tele-Extender, Deluxe (#93643) - The tele-extender is a hollow tube that allows you to attach a camera to the telescope when the eyepiece is installed. This accessory is used for eyepiece projection photography which allows you to capture very high power views of the Sun, Moon, and planets on film. The tele-extender fits over the eyepiece onto the visual back. This tele-extender works with eyepieces that have large housings, like the Celestron Ultima series. Vibration Suppression Pads (#93503) - These pads rest between the ground and tripod feet of your telescope. They reduce the amplitude and vibration time of your telescope when shaken by the wind or an accidental bump. This accessory is a must for long exposure prime focus photography. Wedge, NexStar – The wedge allows you to tilt the telescope so that its polar axis is parallel to the earth's axis of rotation. Ideal for using your NexStar for guided astro photography. A full description of all Celestron accessories can be found in the Celestron Accessory Catalog (#93685).
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Appendix A - Technical Specifications Optical Specification Design Aperture Focal Length F/ratio of the Optical System Primary Mirror: Material Coatings Secondary Mirror: Material Coatings Central Obstruction Corrector Plate: Material Coatings Highest Useful Magnification Lowest Useful Magnification (7mm exit pupil) Resolution: Rayleigh Criterion Dawes Limit Photographic Resolution Light Gathering Power Near Focus standard eyepiece or camera Field of View: Standard Eyepiece : 35mm Camera Linear Field of View (at 1000 yds) Magnification: Standard Eyepiece : Camera Optical Tube Length Weight of Telescope
Schmidt-Cassegrain Catadioptric 8 inches (203.2mm) 80 inches (2032mm) 10 Fine Annealed Pyrex Starbright Coatings - 5 step multilayer process Hand Figured Fine Annealed Pyrex Starbright Coatings - 5 step multilayer process 2.75” Optical Quality Crown Glass A-R Coatings both sides 480x ( ~ 4mm eyepiece) 29x ( ~ 70mm eyepiece) ( ~ 44mm eyepiece with optional Reducer Corrector) .68 arc seconds .57arc seconds 182 lines/mm 843x unaided eye ~ 25 feet .92º 1.0º x .68º (1.6º x 1.07º - with optional Reducer Corrector) 54 feet 50x 25x 16 inches 24 Lbs.
Electronic Specifications Input Voltage Maximum Minimum Batteries Required Power Supply Requirements
12 V DC Nominal 18 V DC Max. 8 V DC Min. 8 AA Alkaline 12 VDC-750 mA (Tip positive)
Mechanical Specifications Motor: Type Resolution Slew speeds Hand Control Fork Arm Software Specifications Software Precision Ports Tracking Rates Tracking Modes Alignment Procedures Database
DC Servo motors with encoders, both axes .26 arc sec Nine slew speeds: 6.5º /sec, 3º /sec, 1.5º/sec, 128x, 64x, 16x, 8x, 2x, 1x Double line, 16 character Liquid Crystal Display 19 fiber optic backlit LED buttons Cast aluminum, with integrated hand control receptacle
Complete Revised NGC Catalog Complete Messier Catalog Complete Caldwell Solar System objects Famous Asterisms Selected SAO Stars
16 bit, 20 arc sec. calculations RS-232 communication port on hand control Sidereal, Solar, Lunar and King Alt-Az, EQ North & EQ South 2-Star Alignment, AutoAlign 18,000+ objects 25 user defined programmable objects. 9 user defined programmable longitudes and latitudes. Enhanced information on over 100 objects 7,840 110 109 9 20 10,385
Total Object Database
18,473 42
Appendix B – Glossary of Terms AAbsolute magnitude
Airy disk
Alt-Azimuth Mounting Altitude Altitude Aperture Apparent Magnitude Arcminute Arcsecond Asterism Asteroid Astrology Astronomical unit Aurora Azimuth
BBinary Stars
CCelestial Equator Celestial pole Celestial Sphere Collimation DDeclination EEcliptic Equatorial mount FFocal length
JJovian Planets
The apparent magnitude that a star would have if it were observed from a standard distance of 10 parsecs, or 32.6 light-years.The absolute magnitude of the Sun is 4.8. at a distance of 10 parsecs, it would just be visible on Earth on a clear moonless night away from surface light. The apparent size of a star's disk produced even by a perfect optical system. Since the star can never be focused perfectly, 84 per cent of the light will concentrate into a single disk, and 16 per cent into a system of surrounding rings. A telescope mounting using two independent rotation axis allowing movement of the instrument in Altitude and Azimuth. In astronomy, the altitude of a celestial object is its Angular Distance above or below the celestial horizon. In astronomy, the altitude of a celestial object is its Angular Distance above or below the celestial horizon. the diameter of a telescope's primary lens or mirror; the larger the aperture, the greater the telescope''s light-gathering power. A measure of the relative brightness of a star or other celestial object as perceived by an observer on Earth. A unit of angular size equal to 1/60 of a degree. A unit of angular size equal to 1/3,600 of a degree (or 1/60 of an arcminute). A small unoffical grouping of stars in the night sky. A small, rocky body that orbits a star. the pseudoscientific belief that the positions of stars and planets exert an influence on human affairs; astrology has nothing in common with astronomy The distance between the Earth and the Sun. It is equal to 149,597,900 km., usually rounded off to 150,000,000 km. the emission of light when charged particles from the solar wind slam into and excite atoms and molecules in a planet''s upper atmosphere. The angular distance of an object eastwards along the horizon, measured from due north, between the astronomical meridian (the vertical line passing through the centre of the sky and the north and south points on the horizon) and the vertical line containing the celestial body whose position is to be measured. . Binary stars are pairs of stars that, because of their mutual gravitational attraction, orbit around a common Centre of Mass. If a group of three or more stars revolve around one another, it is called a multiple system. It is believed that approximately 50 percent of all stars belong to binary or multiple systems. Systems with individual components that can be seen separately by telescope are called visual binaries or visual multiples. The nearest "star" to our solar system, Alpha Centauri, is actually our nearest example of a multiple star system, it consists of three stars two very similar to our Sun and one dim, small, red star orbiting around one another. The projection of the Earth's equator on to the celestial sphere. It divides the sky into two equal hemispheres. the imaginary projection of Earth''s rotational axisnorth or south pole onto the celestial sphere. An imaginary sphere surrounding the Earth, concentric with the Earth's center. the act of putting a telescope''s optics into perfect alignment. The angular distance of a celestial body north or south of the celestial equator. It may be said to correspond to latitude on the surface of the Earth. The projection of the Earth's orbit on to the celestial sphere. It may also be defined as "the apparent yearly path of the Sun against the stars". A telescope mounting in which the instrument is set upon an axis which is parallel to the axis of the Earth; the angle of the axis must be equal to the observer's latitude. The distance between a lens (or mirror) and the point at which the image of an object at infinity is brought to focus. The focal length divided by the aperture of the mirror or lens is termed the focal ratio. Any of the four gas giant planets that are at a greater distance form the sun than the terrestial planets.
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KKuiper Belt LLight-Year
MMagnitude
Meridian
Messier
NNebula North Celestial Pole
Nova OOpen Cluster
PParallax
Parfocal
Parsec
Point Source
RReflector Resolution Right Ascension: (RA) SSchmidt Telescope
Sidereal Rate TTerminator
A region beyond the orbit of Neptune extending to about 1000 AU which is a source of many short period comets. A light-year is the distance light traverses in a vacuum in one year at the speed of 299,792 km/ sec. With 31,557,600 seconds in a year, the light-year equals a distance of 9.46 X 1 trillion km (5.87 X 1 trillion mi). Magnitude is a measure of the brightness of a celestial body. The brightest stars are assigned magnitude 1 and those increasingly fainter from 2 down to magnitude 5. The faintest star that can be seen without a telescope is about magnitude 6. Each magnitude step corresponds to a ratio of 2.5 in brightness. Thus a star of magnitude 1 is 2.5 times brighter than a star of magnitude 2, and 100 times brighter than a magnitude 5 star. The brightest star, Sirius, has an apparent magnitude of -1.6, the full moon is -12.7, and the Sun's brightness, expressed on a magnitude scale, is -26.78. The zero point of the apparent magnitude scale is arbitrary. A reference line in the sky that starts at the North celestial pole and ends at the South celestial pole and passes through the zenith. If you are facing South, the meridian starts from your Southern horizon and passes directly overhead to the North celestial pole. A French astronomer in the late 1700’s who was primarily looking for comets. Comets are hazy diffuse objects and so Messier cataloged objects that were not comets to help his search. This catalog became the Messier Catalog, M1 through M110. Interstellar cloud of gas and dust. Also refers to any celestial object that has a cloudy appearance. The point in the Northern hemisphere around which all the stars appear to rotate. This is caused by the fact that the Earth is rotating on an axis that passes through the North and South celestial poles. The star Polaris lies less than a degree from this point and is therefore refered to as the "Pole Star". Although Latin for "new" it denotes a star that suddenly becomes explosively bright at the end of its life cycle. One of the groupings of stars that are concentrated along the plane of the Milky Way. Most have an asymmetrical appearance and are loosely assembled. They contain from a dozen to many hundred stars. Parallax is the difference in the apparent position of an object against a background when viewed by an observer from two different locations. These positions and the actual position of the object form a triangle from which the apex angle (the parallax) and the distance of the object can be determined if the length of the baseline between the observing positions is known and the angular direction of the object from each position at the ends of the baseline has been measured. The traditional method in astronomy of determining the distance to a celestial object is to measure its parallax. Refers to a group of eyepieces that all require the same distance from the focal plane of the telescope to be in focus. This means when you focus one parfocal eyepiece all the other parfocal eyepieces, in a particular line of eyepieces, will be in focus. The distance at which a star would show parallax of one second of arc. It is equal to 3.26 lightyears, 206,265 astronomical units, or 30,8000,000,000,000 km. (Apart from the Sun, no star lies within one parsec of us.) An object which cannot be resolved into an image because it to too far away or too small is considered a point source. A planet is far away but it can be resolved as a disk. Most stars cannot be resolved as disks, they are too far away. A telescope in which the light is collected by means of a mirror. The minimum detectable angle an optical system can detect. Because of diffraction, there is a limit to the minimum angle, resolution. The larger the aperture, the better the resolution. the angular distance of a celestial object measured in hours, minutes, and seconds along the Celestial Equator eastward from the Vernal Equinox. Rated the most important advance in optics in 200 years, the Schmidt telescope combines the best features of the refractor and reflector for photographic purposes. It was invented in 1930 by Bernhard Voldemar Schmidt (1879-1935). This is the angular speed at which the Earth is rotating. Telescope tracking motors drive the telescope at this rate. The rate is 15 arc seconds per second or 15 degrees per hour. The boundry line between the light and dark portion of the moon or a planet.
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UUniverse VVariable Star WWaning Moon Waxing Moon ZZenith Zodiac
The totality of astronomical things, events, relations and energies capable of being described objectively. A star whose brightness varies over time due to either inherent properties of the star or something eclipsing or obscuring the brightness of the star. The period of the moon's cycle between full and new, when its illuminated portion is decreasing. The period of the moon's cycle between new and full, when its illuminated portion is increasing. The point on the Celestial Sphere directly above the observer. The zodiac is the portion of the Celestial Sphere that lies within 8 deg on either side of the Ecliptic. The apparent paths of the Sun, the Moon, and the planets, with the exception of some portions of the path of Pluto, lie within this band. Twelve divisions, or signs, each 30 deg in width, comprise the zodiac. These signs coincided with the zodiacal constellations about 2,000 years ago. Because of the Precession of the Earth's axis, the Vernal Equinox has moved westward by about 30 deg since that time; the signs have moved with it and thus no longer coincide with the constellations.
45
APPENDIX C LONGITUDES AND LATITUDES LONGITUDE degrees min ALABAMA Anniston Auburn Birmingham Centreville Dothan Fort Rucker Gadsden Huntsville Maxwell AFB Mobile Mobile Aeros Montgomery Muscle Shoal Selma Troy Tuscaloosa ALASKA Anchorage Barrow Fairbanks Haines Hrbor Homer Juneau Ketchikan Kodiak Nome Sitka Sitkinak Skagway Valdez ARIZONA Davis-M AFB Deer Valley Douglas Falcon Fld Flagstaff Fort Huachuc Gila Bend Goodyear GrandCanyon Kingman Luke Page Payson Phoenix Prescott Safford Awrs Scottsdale Show Low Tucson Williams AFB Winslow Yuma Yuma Mcas Yuma Prv Gd ARKANSAS Blytheville Camden El Dorado Fayetteville Ft Smith Harrison Hot Springs Jonesboro Little Rock Pine Bluff Springdale Texarkana Walnut Ridge CALIFORNIA Alameda Alturas Arcata Bakersfield Beale AFB Beaumont Bicycle Lk Big Bear Bishop Blue Canyon
LATITUDE degrees
min
85 85 86 87 85 85 86 86 86 88 88 86 87 86 86 87
51 26.4 45 15 27 43.2 5.4 46.2 22.2 15 4.2 2.4 37.2 59.4 1.2 37.2
33 32 33 32 31 31 33 34 32 30 30 32 34 32 31 33
34.8 40.2 34.2 54 19.2 16.8 58.2 39 22.8 40.8 37.8 18 45 20.4 52.2 13.8
149 156 147 135 151 134 131 152 165 135 154 135 146
51 46.8 52.2 25.8 3 34.8 4.2 3 25.8 21 1.2 31.8 21
61 71 64 59 59 58 55 57 64 57 56 59 61
13.2 18 49.2 13.8 37.8 22.2 21 45 30 4.2 52.8 45 7.8
110 112 109 111 111 110 113 112 112 113 112 111 111 112 112 109 111 110 110 111 110 115 114 114
52.8 4.8 3.6 43.8 40.2 21 10.2 22.8 9 57 22.8 27 19.8 1.2 25.8 40.8 55.2 0 55.8 40.2 43.8 0 37.2 2.4
32 33 31 33 35 31 33 33 35 35 33 36 34 33 34 32 33 34 32 33 35 33 32 32
10.2 40.8 27 28.2 7.8 36 33 25.2 57 16.2 31.8 55.8 13.8 25.8 39 49.2 37.2 16.2 7.2 18 1.2 6 39 51
89 92 92 94 94 93 93 90 92 91 94 94 90
57 2.4 4.8 10.2 22.2 9 0.6 39 22.8 55.8 7.8 0 55.8
35 33 33 36 35 36 34 35 35 34 36 33 36
58.2 31.2 13.2 0 19.8 16.2 28.8 49.8 13.2 10.2 10.8 27 7.8
122 120 124 119 121 116 116 116 118 120
19.2 31.8 0.6 3 27 57 37.2 40.8 3.6 4.2
37 41 40 35 39 33 35 34 37 39
46.8 28.8 58.8 25.8 7.8 55.8 16.8 16.2 36 16.8
Blythe Burbank Campo Carlsbad Castle AFB Chico China Lake Chino Concord Crescent Cty Daggett Edwards AFB El Centro El Monte El Toro Eureka Fort Hunter Fort Ord Fresno Fullerton George AFB Hawthorne Hayward Imperial Imperial Bch La Verne Lake Tahoe Lancaster Livermore Long Beach Los Alamitos Los Angeles Mammoth March AFB Marysville Mather AFB Mcclellan Merced Miramar NAS Modesto Moffet Mojave Montague Monterey Mount Shasta Mount Wilson Napa Needles North Is Norton AFB Oakland Ontario Intl Oxnard Palm Springs Palmdale Palo Alto Paso Robles Pillaro Pt Point Mugu Pt Arena Pt Arguello Pt Piedras Red Bluff Redding Riverside Sacramento Salinas San Carlos San Clemente San Diego San Francisco San Jose San Luis Obi San Mateo San Miguel Sandburg Santa Ana Santa Barb Santa Maria Santa Monica Santa Rosa
LONGITUDE degrees 114 118 116 117 120 121 117 117 122 124 116 117 115 118 117 124 121 121 119 117 117 118 122 115 117 117 120 118 121 118 118 118 118 117 121 121 121 120 117 120 122 118 122 121 122 118 122 114 117 117 122 117 119 116 118 122 120 122 119 124 121 121 122 122 117 121 121 122 117
min 43.2 22.2 28.2 16.8 34.2 51 40.8 37.8 3 13.8 46.8 52.8 40.8 1.8 43.8 16.8 19.2 46.2 43.2 58.2 22.8 19.8 7.2 34.2 7.2 46.8 0 13.2 49.2 9 3 2.4 55.2 16.2 34.2 1.8 2.4 31.2 9 57 3 9 31.8 51 19.2 4.2 16.8 37.2 1.2 13.8 13.2 37.2 1.2 3 7.8 7.2 37.8 49.8 7.2 13.2 7.2 16.8 15 1.8 27 3 3.6 15 37.2
117 122
7.8 22.8
32 37
49.2 37.2
121 120 117 120 118 117 119 120 118 122
55.2 39 34.8 2.4 43.8 52.8 49.8 27 27 49.2
37 35 33 34 34 33 34 34 34 38
22.2 13.8 22.8 1.8 45 40.2 25.8 54 1.2 31.2
46
LATITUDE degrees 33 34 32 33 37 39 35 33 37 41 34 34 32 34 33 41 36 36 36 33 34 33 37 32 32 34 38 34 37 33 33 33 37 33 39 38 38 37 32 37 37 35 41 36 41 34 38 34 32 34 37 34 34 33 35 37 35 37 34 39 34 35 40 40 33 38 36 37 33
min 37.2 12 37.2 7.8 22.8 46.8 40.8 58.2 58.8 46.8 52.2 54 49.2 4.8 40.2 19.8 0 40.8 46.2 52.2 34.8 55.2 39 49.8 34.2 6 54 43.8 42 49.2 46.8 55.8 37.8 52.8 6 34.2 40.2 16.8 52.2 37.8 25.2 3 43.8 34.8 19.2 13.8 13.2 46.2 42 6 43.8 3 12 49.8 3 28.2 40.2 49.8 7.2 34.8 57 40.2 9 30 57 31.2 40.2 31.2 25.2
Shelter Cove Siskiyou Stockton Superior Val Susanville Thermal Torrance Travis AFB Tahoe Tustin Mcas Ukiah Van Nuys Vandenberg Visalia COLORADO Air Force A Akron Alamosa Aspen Brmfield/Jef Buckley Colo Sprgs Cortez Craig-Moffat Denver Durango Eagle Englewood Fort Carson Fraser Ft Col/Lovel Ft Collins Grand Jct Greeley-Wld Gunnison La Junta Lamar Leadville Limon Montrose Pueblo Rifle Salida Trinidad Winter Park
LONGITUDE degrees 124 122 121 117 120 116 118 121 120 117 123 118 120 119
min 4.2 28.2 15 0.6 57 10.2 19.8 55.8 7.8 49.8 1.2 28.8 57 2.4
LATITUDE degrees 40 41 37 35 40 33 33 38 39 33 39 34 35 36
105 103 105 106 105 104 104 108 107 104 107 106 104 104 105 105 105 108 104 106 103 102 106 103 107 104 107 106 104 105
21 13.2 52.2 52.2 7.2 45 43.2 37.8 31.8 52.2 45 55.2 49.8 46.2 3 1.2 4.8 31.8 37.8 55.8 31.2 3.6 1.8 4.2 52.8 31.2 4.8 3 19.8 52.2
39 40 37 39 39 39 38 37 40 39 37 39 39 38 39 40 40 39 40 38 38 38 39 39 38 38 39 38 37 40
31.2 10.2 27 13.2 54 43.2 49.2 18 30 45 9 39 34.2 40.8 34.2 27 34.8 7.2 25.8 33 3 7.2 15 10.8 30 16.8 31.8 31.8 15 0
73 73 72 72 72 72 72
7.8 28.8 3 39 40.2 4.8 40.8
41 41 41 41 41 41 41
10.2 22.2 19.8 43.8 13.2 18 55.8
75 75
28.2 3.6
39 39
7.8 40.2
77
27.6
38
57
85 81 81 80
1.8 34.2 33 33
29 29 28 28
43.8 7.2 4.8 28.2
81 86 83 81 86 86 82 81 80 81 82 80 86 81 81 81 82 85 81
52.8 31.2 0.6 3 31.2 31.8 46.2 52.2 9 52.2 16.2 22.8 40.8 40.8 45 57 31.2 10.8 25.2
30 30 29 29 30 30 27 26 26 26 29 25 30 30 24 28 27 30 30
13.2 46.8 37.2 10.8 39 28.8 36 34.8 4.2 39 40.8 28.8 25.8 13.8 33 1.8 51 50.4 24
min 1.8 46.8 54 19.8 37.8 37.8 48 16.2 19.2 42 7.8 13.2 12 19.2
CONNECTICUT
Bridgeport Danbury Groton Hartford New Haven New London Windsor Loc DELAWARE Dover Wilmington D.C. WASH Washington FLORIDA Apalachicola Astor NAS Avon Park G Cape Canaveral Cecil Crestview Cross City Daytona Bch Duke Fld Eglin AFB Egmont Key Fort Myers Ft Lauderdale Ft Myers Gainesville Homestead Hurlburt Fld Jacksonville Key West Lakeland Macdill AFB Marianna Mayport NAS
Melbourne Miami Naples Nasa Shuttle Orlando Panama City Patrick AFB Pensacola Ruskin Saint Peters Sanford Sarasota Tallahassee Tampa Intl Titusville Tyndall AFB Vero Beach West Palm Beach Whiting Fld GEORGIA Albany Alma Athens Atlanta Augusta/Bush Brunswick Columbus Dobbins AFB Fort Benning Ft Stewart Hunter Aaf La Grange Macon/Lewis Moody AFB Robins AFB Rome/Russell Valdosta Waycross HAWAII Barbers Pt Barking San Fr Frigate Hilo Honolulu Int Kahului Maui Kaneohe Mca Kilauea Pt Lanai-Lanai Lihue-Kauai Maui Molokai Upolo Pt Ln WaimeaKoha IDAHO Boise Burley Challis Coeur d'Alene Elk City Gooding Grangeville Idaho Falls Lewiston Malad City Malta Mccall Mullan Pocatello Salmon Soda Springs Sun Valley Twin Falls ILLINOIS Alton Aurora Bistate Park Bloomington Bradford Cairo Carbondale Centralia Champaign Chicago Danville DeKalb Decatur Du Page Galesburg
LONGITUDE degrees 80 80 81 80 81 85 80 87 82 82 81 82 84 82 80 85 80 80
min 37.8 16.8 4.8 40.8 19.2 40.8 3.6 19.2 3.6 40.8 15 33 22.2 31.8 4.8 34.8 25.2 7.2
LATITUDE degrees 28 25 26 28 28 30 28 30 27 27 28 27 30 27 28 30 27 26
87
1.2
30
43.2
84 82 83 84 81 81 84 84 85 81 81 85 83 83 83 85 83 82
10.8 31.2 19.2 25.2 58.2 22.8 55.8 31.2 0 34.2 9 4.2 39 1.2 3.6 10.2 16.8 2.4
31 31 33 33 33 31 32 33 32 31 32 33 32 30 32 34 30 31
31.8 31.8 57 39 22.2 9 31.2 55.2 19.8 52.8 1.2 0.6 42 58.2 37.8 21 46.8 15
158 160 166 155 157 156 158 159 156 159 156 157 156 156
7.2 1.8 28.2 4.2 55.8 25.8 16.8 40.2 57 21 49.8 0.6 28.2 7.2
21 22 24 19 21 20 21 22 20 21 20 21 20 20
31.8 3 27 43.2 21 54 45 22.8 48 58.8 58.2 9 25.2 0
116 113 114 116
13.2 46.2 13.2 49.2
43 42 44 47
34.2 31.8 31.2 46.2
115 115 116 112 117 112 113 116 115 112 113 111 114 114
25.8 10.2 7.8 4.2 1.2 19.2 22.2 0.6 4.8 3.6 5.4 34.8 1.8 28.8
45 43 45 43 46 42 42 44 47 42 45 42 43 42
49.2 0 55.2 31.2 22.8 10.2 18 52.8 28.2 55.2 10.8 39 30 28.8
90 88 90 88 89 89 89 89 88 87 87 88 88 88 90
3 19.2 9 55.8 3.6 13.2 15 5.4 16.8 39 3.6 43.2 52.2 15 25.8
38 41 38 40 41 37 37 38 40 41 40 41 39 41 40
52.8 46.2 34.2 28.8 9.6 4.2 46.8 30.6 1.8 54 12 55.8 49.8 55.2 55.8
min 6 49.2 7.8 37.2 25.8 12 13.8 21 58.2 55.2 46.8 24 22.8 58.2 31.2 4.2 39 40.8
Glenview NAS Kankakee Macomb Marion Marseilles Mattoon Moline/Quad Mount Vernon Peoria Quincy Rockford Salem Scott AFB Springfield Sterling Taylorville Vandalia INDIANA Bakalar Bloomington Elkhart Evansville Fort Wayne Gary Grissom AFB Indianapolis Muncie South Bend Terre Haute W Lafayette IOWA Burlington Cedar Rapids Des Moines Dubuque Estherville Fort Dodge Lamoni Mason City Ottumwa Sioux City Spencer Waterloo Mun KANSAS Chanute Col. J Jabar Concordia Dodge City Elkhart Emporia Ft Leavnwrth Ft Riley Garden City Goodland Hays Hill City Hutchinson Johnson Cnty Liberal Manhatten Mcconnell Af Medicine Ldg Olathe Russell Salina Topeka Topeka/Forbe Wichita KENTUCKY Bowling Gren Ft Campbell Ft Knox Jackson Lexington London Louisville Owensboro Paducah Pikeville LOUISIANA Alexandria Barksdale Baton Rouge Boothville Cameron Heli Claiborne R England AFB Eugene Is. Fort Polk
LONGITUDE degrees min 87 49.2
LATITUDE degrees 42
min 4.8
87 90 89 88 88 90 88
51 39.6 0 40.8 16.8 31.2 51.6
41 40 37 41 39 41 38
4.2 31.2 45 22.2 28.8 27 19.2
89 91 89 88 89 89 89 89 89
40.8 1.2 0.6 57.6 51 40.2 40.2 19.8 10.2
40 39 42 38 38 39 41 39 38
40.2 55.8 12 37.8 33 51 44.4 31.8 59.4
86 86 86 87 85 87 86 86 85 86 87 86
3 37.2 0 31.8 1.2 25.2 9 16.2 22.8 19.2 1.8 55.8
39 39 41 38 41 41 40 39 40 41 39 40
22.8 7.8 43.2 3 0 37.2 39 43.8 13.8 42 27 25.2
91 91 93 90 94 94 93 93 92 96 95 92
7.2 4.2 39 4.2 45 10.8 55.8 19.8 27 22.8 9 2.4
40 41 41 42 43 42 40 43 41 42 43 42
46.8 52.8 31.8 24 24 33 37.2 9 6 24 10.2 33
95 97 97 99 101 96 94 96 100 101 99 99 97 94 100 96 97 98 94 98 97 95 95 97
28.8 13.2 39 58.2 52.8 1.2 55.2 46.2 43.2 4.2 16.2 49.8 52.2 52.8 58.2 40.2 16.2 34.8 5.4 49.2 39 37.2 40.2 25.8
37 37 39 37 37 38 39 39 37 39 38 39 38 38 37 39 37 37 38 38 38 39 38 37
40.2 45 33 46.2 0 19.8 22.2 3 55.8 22.2 51 22.8 4.2 49.2 3 9 37.2 18 51 52.2 48 4.2 57 39
86 87 85 83 85 84 85 87 88 82
25.8 3 58.2 19.2 0 4.2 40.2 10.2 46.2 31.2
36 36 37 37 38 37 38 37 37 37
58.2 40.2 54 36 3 4.8 13.8 45 4.2 28.8
92 93 91 89 93 92 92 91 93
1.8 40.2 9 40.2 1.8 57 33 46.8 1.2
31 32 30 29 29 31 31 28 31
22.8 30 31.8 33 46.8 13.2 19.8 28.2 3
47
LONGITUDE degrees Grand Isle 90 High Island 94 Houma 90 Intercoastal 92 Lafayette 92 Lake Charles 93 Lk Palourde 91 Missippi Can 89 Monroe 92 Morgan City 91 New Iberia 91 New Orleans 90 S Marsh Isl 91 Shreveport 93 Slidel 89 MAINE Augusta 69 Bangor 68 Bar Harbor 68 Brunswick 69 Caribou Mun 68 Greenville 69 Houlton 67 Loring AFB 67 Portland 70 Presque Isle 68 Rockland 69 Rumford 70 MARYLAND Andrews AFB 76 Baltimore 76 Fort Meade 76 Hagerstown 77 Ocean City 75 Patuxent 76 Phillips 76 Salisbury 75 MASSACHUSETTS Bedford 71 Beverly 70 Boston 71 Cape Cod 70 Chatham 69 Fort Devens 71 Hyannis 70 Lawrence 71 Marthas Vine 70 Nantucket 70 New Bedford 70 Norwood 71 Otis ANGB 70 Pittsfield 73 S Weymouth 70 Westfield 72 Westover 72 Worcester 71 MICHIGAN Alpena 83 Ann Arbor 83 Battle Creek 85 Benton 86 Harbor Chippewa 84 Coopersville 85 Copper Harb 87 Detroit 83 Escanaba 87 Flint/Bishop 83 Grand Rapids 85 Hanco*ck 88 Harbor Beach 82 Houghton 84 Lake Iron Mtn 88 Ironwood 90 Jackson 84 Kalamazoo 85 Lansing 84 Manistee 86 Marquette 87 Menominee 87 Muskegon 86 Pellston 84 Pontiac 83 Saginaw 84 Sault Ste M 84 Sawyer AFB 87 Selfridge 82 Seul Choix 85 Traverse Cty 85
min 4.2 2.4 39 7.2 0 13.2 0.6 3 3 1.2 52.8 15 58.8 45 49.2
LATITUDE degrees 29 28 29 29 30 30 29 28 32 29 30 29 28 32 30
min 10.8 7.8 34.2 43.8 12 7.2 42 46.8 31.2 42 1.8 58.8 18 31.2 21
4.8 49.2 22.2 55.8 1.2 33 46.8 52.8 19.2 3 7.2 52.8
44 44 44 43 46 45 46 46 43 46 44 44
19.2 48 27 52.8 52.2 27 7.8 57 39 40.8 4.2 52.8
52.2 40.2 46.2 43.2 7.8 2.4 10.2 3
38 39 39 39 38 38 39 38
49.2 10.8 4.8 42 33 16.8 28.2 19.8
16.8 55.2 1.8 3 58.2 3.6 16.8 7.2 37.2 4.2 58.2 10.8 31.2 10.8 55.8 43.2 31.8 52.2
42 42 42 41 41 42 41 42 41 41 41 42 41 42 42 42 42 42
28.2 34.8 22.2 46.8 40.2 34.2 40.2 43.2 24 15 40.8 10.8 39 15.6 9 10.2 12 16.2
34.2 45 13.8 25.8
45 42 42 42
4.2 13.2 18 7.8
28.2 57 51 1.2 4.8 45 31.2 3 31.8 40.8
46 43 47 42 45 42 42 47 43 44
15 4.2 28.2 25.2 43.8 58.2 52.8 10.2 49.8 22.2
7.2 7.8 28.2 33 3.6 15 57 37.8 15 4.8 25.2 4.8 22.2 2.4 49.8 55.2 34.8
45 46 42 42 42 44 46 45 43 45 42 43 46 46 42 45 44
49.2 31.8 16.2 13.8 46.2 16.2 52.8 7.2 10.2 34.2 40.2 31.8 28.2 21 37.2 55.2 43.8
Wurtsmith Ypsilanti MINNESOTA Albert Lea Alexandria Bemidji Muni Brainerd-Crw Detroit Laks Duluth Ely Fairmont Fergus Falls Grand Rapids Hibbing Intl Falls Litchfield Mankato Marshall Arpt Minneapolis Park Rapids Pequot Lake Rochester Saint Paul St Cloud Thief River Tofte Warroad Worthington MISSISSIPPI Columbus AFB Golden Trian Greenville Greenwood Gulfport Hattiesburg Jackson Keesler AFB Laurel Mccomb Meridian NAS Meridian/Key Natchez Oxford Tupelo MISSOURI Columbia Cape Girardeau Ft Leonard Jefferson City Joplin Kansas City Kirksville Monett Muskogee Poplar Bluff Richards-Geb Spickard Springfield St Joseph St Louis Vichy/Rolla West Plains Whiteman AFB MONTANA Billings Bozeman Broadus Butte Cut Bank Dillon Drummond Glasgow Glendive Great Falls Harlowton Havre Helena Jordan Kalispell Lewiston Livingston Malmstrom Miles City Missoula Monida Sidney W Yellowston
LONGITUDE degrees min 83 2.4 83 31.8
LATITUDE degrees 44 42
min 27 13.8
93 95 94 94 95 92 91 94 96 93 92 93 94 93 95 93 95 94 92 93 94 96 90 95 95
22.2 22.8 55.8 7.8 52.8 10.8 49.2 25.2 4.2 31.2 51 22.8 31.2 55.2 49.2 28.2 4.2 19.2 3 3 4.2 10.8 49.8 21 34.8
43 45 47 46 46 46 47 43 46 47 47 48 45 44 44 44 46 46 43 44 45 48 47 48 43
40.8 52.2 30 24 49.2 49.8 54 39 18 13.2 22.8 34.2 7.8 13.2 27 49.8 54 36 55.2 55.8 33 4.2 34.8 55.8 39
88
27
33
39
88 90 90 89 89 90 88 89 90 88 88 91 89 88
34.8 58.8 4.8 4.2 19.8 4.8 55.2 10.2 28.2 34.2 45 15 32.4 46.2
33 33 33 30 31 32 30 31 31 32 32 31 34 34
27 28.8 30 24 28.2 19.2 25.2 40.2 10.8 33 19.8 37.2 23.4 16.2
92 89
13.2 34.8
38 37
49.2 13.8
92 92 94 94 92 94 95 90 94 93 93 95 90 91 92 93
7.8 10.2 3 43.2 33 21 21.6 28.2 33 43.2 22.8 31.8 22.2 46.2 25.2 33
37 38 37 39 40 37 35 36 38 40 37 40 38 38 37 38
45 36 10.2 19.2 6 19.8 39.6 46.2 51 15 13.8 16.8 45 7.8 13.2 43.8
108 111 105 112 112 112 113 106 104 111 109 109 112 106 114 109 110 111 105 114 112 104 111
31.8 9 40.2 3 22.2 33 9 37.2 4.8 22.2 49.8 46.2 0 55.8 16.2 27 25.8 10.8 52.2 4.8 19.2 10.8 0.6
45 45 45 45 48 45 46 48 47 47 46 48 46 47 48 47 45 47 46 46 44 47 44
48 46.8 40.2 57 36 15 40.2 13.2 7.8 28.8 25.8 33 36 19.8 18 3 42 30 25.8 55.2 34.2 43.2 39
LONGITUDE degrees NEBRASKA Ainsworth 99 Alliance 102 Beatrice 96 Broken Bow 99 Burwell 99 Chadron 103 Columbus 97 Cozad 100 Falls City 95 Grand Island 98 Hastings 98 Imperial 101 Kearney 99 Lincoln Muni 96 Mccook 100 Mullen 101 Norfolk 97 North Omaha 96 North Platte 100 O'neill 98 Offutt AFB 95 Omaha 95 Ord/Sharp 98 Scottsbluff 103 Sidney Muni 102 Valentine 100 NEVADA Austin 117 Battle Mtn 116 Caliente 114 Elko 115 Ely/Yelland 114 Eureka 115 Fallon NAS 118 Hawthorne 118 Ind Sprng Rn 115 Las Vegas 115 Lovelock 118 Mercury 116 Nellis AFB 115 Owyhee 116 Reno 119 Tonopah 117 Wildhorse 116 Winnemucca 117 Yucca Flat 116 NEW HAMPSHIRE Berlin 71 Concord 71 Jaffrey 72 Keene 72 Laconia 71 Lebanon 72 Manchester 71 Mt Washingtn 71 Nashua 71 Pease AFB 70 Wolfeboro 71 NEW JERSEY Atlantic CtIy 74 Barnegat Ls 74 Fairfield 74 Lakehurst 74 Mcguire AFB 74 Millville 75 Morristown 74 Newark Intl 74 Teterboro 74 Trenton 74 NEW MEXICO Albuquerque 106 Cannon 103 Carlsbad 104 Clayton Arpt 103 Corona 105 Deming 107 Farmington 108 Gallup/Clark 108 Grants 107 Hobbs 103 Holloman 106 AFB Las Cruces 106 Las Vegas 105 Los Alamos 106 Moriarity 106 Northrup Str 106 Raton 104 Roswell 104
48
min
LATITUDE degrees
min
58.8 4.8 45 39 9 4.8 21 0 34.8 19.2 25.8 23.4 0 45 34.8 3 25.8 1.2 40.8 40.8 55.2 5.4 57 3.6 58.8 33
42 42 40 41 41 42 41 40 40 40 40 40 40 40 40 42 41 41 41 42 41 41 41 41 41 42
34.8 3 19.2 25.8 46.8 49.8 27 52.2 4.2 58.2 36 19.8 43.8 51 13.2 3 58.8 22.2 7.8 28.2 7.2 18 37.2 52.2 6 52.2
7.8 52.2 31.2 46.8 51 58.2 4.2 37.8 34.2 10.2 55.2 1.2 1.8 10.2 46.8 4.8 15 4.8 4.8
39 40 37 40 39 39 39 38 36 36 40 36 36 42 39 38 41 40 37
49.8 37.2 37.2 49.8 16.8 30 25.2 33 31.8 4.8 6 37.2 13.8 34.8 30 4.2 19.8 54 34.8
10.8 3 0 16.2 25.8 1.8 25.8 1.8 31.2 49.2 22.8
44 43 42 42 43 43 42 44 42 43 44
34.8 12 48 54 34.2 37.8 55.8 16.2 46.8 4.8 0
34.2 16.8 16.8 21 3.6 4.2 25.2 10.2 3 49.2
39 40 40 40 40 39 40 40 40 40
27 16.8 52.2 1.8 1.2 22.2 48 42 51 16.8
3.6 19.2 16.2 9 40.8 4.2 13.8 46.8 5.4 1.2 0.6
35 34 32 36 34 32 36 35 35 32 32
3 22.8 19.8 27 6 15 45 31.2 10.2 40.8 51
46.2 9 16.8 3 2.4 3 31.8
32 35 35 34 32 36 33
18 39 52.8 58.8 54 44.4 18
LONGITUDE degrees Santa Fe 106 Silver City 108 Socorro 106 Taos 105 Truth Or Con 107 Tucumcari 103 White Sands 106 NEW YORK Albany 73 Ambrose 74 Binghamton 75 Buffalo 78 Dansville 78 Elmira 76 Farmingdale 73 Fort Drum 75 Glens Falls 73 Griffiss AFB 75 Islip 73 Ithaca 76 Jamestown 79 Massena 74 Monticello 74 New York 73 Newburgh 74 Niagara Fall 78 Ogdensburg 75 Oneonta 75 Plattsburgh 73 Rochester 77 Saranac Lk 74 Schenectady 73 Syracuse 76 Utica 75 Watertown 76 Westhampton 72 White Plains 73 NORTH CAROLINA Asheville 82 Cape Hattera 75 Charlotte 80 Cherry Point 76 Dare Co Gr 76 Diamond Sho 75 Elizabeth 76 Fayetteville 78 Fort Bragg 78 Greensboro 79 Hickory 81 Hot Springs 82 Jacksonville 77 Kinston 77 Mackall Aaf 79 Manteo Arpt 75 New Bern 77 New River 77 Pope AFB 79 Raleigh-Durh 78 Rocky Mt 77 Southern Pin 79 Wilmington 77 Winston80 Salem NORTH DAKOTA Bismarck 100 Devil's Lake 98 Dickenson 102 Fargo 96 Grand Forks 97 Jamestown 98 Lidgerwood 97 Minot 101 Roseglen 101 Williston 103 OHIO Athens 82 Canton 81 Cincinnati 84 Cleveland 81 Columbus 82 Dayton 84 Findlay 83 Mansfield 82 Rickenbacker 82 Toledo 83 Willoughby 81 Youngstown 80 Zanesville 81
min 4.8 10.2 5.4 34.2 16.2 3.6 2.4
LATITUDE degrees 35 32 34 36 33 35 32
min 37.2 37.8 4.2 25.2 13.8 10.8 37.8
4.8 22.2 58.8 43.8 1.2 5.4 25.8 43.8 37.2 2.4 0.6 28.2 15 51 4.8 58.8 0.6 57 2.4 7.2 28.2 40.2 1.2 55.8 7.2 22.8 1.2 37.8 43.2
42 40 42 42 42 42 40 44 43 43 40 42 42 44 41 40 41 43 44 42 44 43 44 42 43 43 44 40 41
45 45 13.2 55.8 58.2 10.2 43.8 3 21 13.8 46.8 28.8 9 55.8 42 46.2 30 6 40.8 52.2 39 7.2 22.8 51 7.2 9 0 51 4.2
33 33 55.8 52.8 3 3 10.8 52.8 55.8 57 22.8 49.2 37.2 37.8 3 40.8 3 25.8 1.2 46.8 52.8 23.4 55.2 13.8
35 35 35 34 36 35 36 35 35 36 35 35 34 35 35 35 35 34 35 35 35 35 34 36
25.8 16.2 13.2 54 7.8 15 16.2 0 7.8 4.8 45 54 49.2 19.2 1.8 55.2 4.8 42 10.2 52.2 51 14.4 16.2 7.8
45 5.4 4.8 4.8 10.8 40.8 9 16.8 49.8 37.8
46 48 46 46 47 46 46 48 47 48
46.2 7.2 46.8 54 57 55.2 6 16.2 45 10.8
13.8 25.8 40.2 40.8 52.8 1.2 40.2 31.2 55.8 4.8 2.4 40.2 5.4
39 40 39 41 40 39 41 40 39 41 41 41 39
12.6 55.2 3 31.2 0 54 1.2 49.2 49.2 36 37.8 16.2 57
LONGITUDE degrees OKLAHOMA Altus AFB 99 Ardmore 97 Bartlesville 96 Clinton 99 Enid 97 Fort Sill 98 Gage 99 Hobart 99 Lawton 98 Mcalester 95 Norman 97 Oklahoma 97 Page 94 Ponca City 97 Stillwater 97 Tinker AFB 97 Tulsa 95 Vance AFB 97 OREGON Astoria 123 Aurora 122 Baker 117 Brookings 124 Burns Arpt 118 Cape Blanco 124 Cascade 121 Corvallis 123 Eugene 123 Hillsboro 122 Klamath Fall 121 La Grande 118 Lake View 120 Meacham 118 Medford 122 Newport 124 North Bend 124 Ontario 117 Pendleton 118 Portland 122 Redmond 121 Roseburg 123 Salem 123 Sexton 123 The Dalles 121 Troutdale 122 PENNSYLVANIA Allentown 75 Altoona 78 Beaver Falls 80 Blairsville 79 Bradford 78 Dubois 78 Erie 80 Franklin 79 Harrisburg 76 Johnstown 78 Lancaster 76 Latrobe 79 Middletown 76 Muir 76 Nth Philadel 75 Philadelphia 75 Philipsburg 78 Pittsburgh 79 Reading 75 Site R 77 State Colleg 77 Wilkes-Barre 75 Williamsport 76 Willow Grove 75 RHODE ISLAND Block Island 71 Nth Kingston 71 Providence 71 SOUTH CAROLINA Anderson 82 Beaufort 80 Charleston 80 Columbia 81 Florence 79 Greenville 82 Mcentire 80
min
LATITUDE degrees
min
16.2 1.2 0 1.2 4.8 2.4 46.2 3 25.2 46.8 28.2 3.6 37.2 0.6 5.4 22.8 5.4 55.2
34 34 36 35 36 34 36 35 34 34 35 35 34 36 36 35 36 36
40.2 18 45 21 22.8 39 18 0 34.2 52.8 13.8 24 40.8 43.8 9.6 25.2 12 19.8
52.8 45 49.2 28.2 57 57 52.8 16.8 13.2 57 43.8 0 21 2.4 52.2 3 15 1.2 51 3.6 9 22.2 0 22.2 9 2.4
46 45 44 42 43 43 45 44 44 45 42 45 42 45 42 44 43 44 45 45 44 43 44 42 45 45
9 15 49.8 4.8 36 22.8 40.8 30 7.2 31.8 9 16.8 10.8 30 22.2 37.8 25.2 1.2 40.8 36 16.2 13.8 55.2 37.2 37.2 33
25.8 19.2 19.8 5.4 37.8 5.4 10.8 52.2 51 49.8 1.8 2.4 46.2 34.2 1.2 15 7.8 55.8 58.2 25.8 49.8 43.8 55.2 9
40 40 40 40 41 41 42 41 40 40 40 40 40 40 40 39 41 40 40 39 40 41 41 40
39 18 45 16.2 48 10.8 4.8 22.8 13.2 19.2 7.8 16.8 12 25.8 4.8 52.8 28.2 21 22.8 43.8 51 19.8 15 12
34.8 25.2 25.8
41 41 41
10.2 36 43.8
43.2 43.2 1.8 7.2 43.2 21 4.8
34 32 32 33 34 34 33
30 28.8 54 57 10.8 51 55.2
LONGITUDE degrees Myrtle Beach 78 Shaw AFB 80 Spartanburg 81 SOUTH DAKOTA Aberdeen 98 Brookings 96 Chamberlain 99 Custer 103 Ellsworth 103 Huron 98 Lemmon 102 Mitchell 98 Mobridge 100 Philip 101 Pierre 100 Rapid City 103 Redig 103 Sioux Falls 96 Watertown 97 Yankton 97 TENNESSEE Bristol 82 Chattanooga 85 Clarksville 87 Crossville 85 Dyersburg 89 Jackson 88 Knoxville 83 Memphis Intl 90 Monteagle 85 Nashville 86 Smyrna 86 TEXAS Abilene 99 Alice 98 Amarillo 101 Austin 97 Bergstrom Af 97 Big Sky 101 Big Spring 101 Brownsville 97 Brownwood 98 Carswell AFB 97 Chase NAS 97 Childress 100 College Stn 96 Corpus Chrst 97 Cotulla 99 Dalhart 102 Dallas/FW 97 Del Rio 100 Dyess AFB 99 El Paso 106 Ellington Af 95 Fort Worth 97 Ft Hood Aaf 97 Galveston 94 Gray AFB 97 Greenville 96 Guadalupe 104 Harlingen 97 Hondo 99 Houston 95 Junction 99 Kelly AFB 98 Kerrville 99 Killeen 97 Kingsville 97 Laredo Intl 99 Laughlin AFB 100 Longview 94 Lubbock 101 Lufkin 94 Marfa 104 Mcallen 98 Midland 102 Mineral Wlls 98 Palacios 96 Paris/Cox 95 Plainview 101 Port Arthur 94 Reese AFB 102 Rockport 97
49
min 55.8 28.2 57.6
LATITUDE degrees 33 33 34
min 40.8 58.2 55.2
25.8 4.8 19.2 3.6 0.6 13.2 10.2 1.8 25.8 3.6 16.8 4.2 19.2 43.8 9 22.8
45 44 43 43 44 44 45 43 45 44 44 44 45 43 44 42
27 18 48 46.2 9 22.8 55.8 46.2 31.8 3 22.8 3 9.6 34.8 55.2 55.2
2.4 1.2 25.2 4.8 2.4 55.2 58.8 0 30.6 40.8 3
36 35 36 35 36 35 35 35 35 36 36
28.8 1.8 37.2 57 1.2 36 49.2 3 9 7.2 0
40.8 1.8 4.2 4.2 40.8 28.8 27 25.8 57.6 25.8 40.2 16.8 22.2 3 13.2 33 1.8 55.2 51 2.4 10.2 21 43.2 52.2 49.8 4.2 4.8 40.2 10.2 21 46.2 34.8 4.8 40.8 49.2 28.2 46.8 43.2 49.2 45 1.2 13.8 10.8 4.2 15 27 42.6 1.2 3 1.8
32 27 35 30 30 32 32 25 31 32 28 34 30 27 28 36 32 29 32 31 29 32 31 29 31 33 31 26 29 29 30 29 29 31 27 27 29 32 33 31 30 26 31 32 28 33 34 30 33 28
25.2 43.8 13.8 18 12 23.4 18 54 47.4 46.8 22.2 25.8 34.8 46.2 27 1.2 54 22.2 25.8 48 37.2 49.2 9 16.2 4.2 4.2 49.8 13.8 21 58.2 30 22.8 58.8 4.8 30 31.8 22.2 22.8 39 13.8 22.2 10.8 57 46.8 43.2 37.8 10.2 34.8 36 4.8
LONGITUDE degrees San Angelo 100 San Antonio 98 Sanderson 102 South Brazos 95 Stephenville 98 Temple 97 Tyler/Pounds 95 Victoria 96 Wichita Flls 98 Wink 103 UTAH Blanding 109 Bullfrog Mar 110 Cedar City 113 Delta 112 Eagle Range 113 Green River 110 Hanksville 110 Hill AFB 111 Logan 111 Milford 113 Moab 109 Ogden 112 Price/Carbon 110 Provo 111 Roosevelt 110 Saint George 113 Salt Lake Ct 111 Tooele 112 Vernal 109 Wendover 114 VERMONT Burlington 73 Montpelier 72 Newport 72 Rutland 73 St Johnsbury 72 Wilmington 72 VIRGINIA Charlottes 78 Chesapeake 76 Danville 79 Fort Belvoir 77 Fort Eustis 76 Hot Springs 79 Langley AFB 76 Lynchburg 79 Newport 76 News Norfolk NAS 76 Norfolk Rgnl 76 Oceana NAS 76 Quantico Mca 77 Richmond 77 Roanoke 79 Muni Staunton 78 Volens 78 Wallops Sta 75 WASHINGTON Bellingham 122 Bremerton 122 Burlington 122 Colville 118 Ephrata 119 Everet/Paine 122 Fairchild 117 Fort Lewis 122 Hanford 119 Hoquiam 123 Mcchord AFB 122 Moses Lake 119 Oak Harbor 122 Olympia 122 Omak 119 Pasco 119 Port Angeles 123 Pullman 117 Quillayute 124 Renton 122 Seattle 122 Shelton 123 Spokane 117 Tacoma 122 Toledo 122
min 3 28.2 25.2 52.2 10.8 25.2 2.4 55.2 3 1.2
LATITUDE degrees 31 29 30 28 32 31 32 28 33 31
min 22.2 31.8 10.2 1.8 13.2 9 22.2 51 58.8 46.8
46.8 4.2 0.6 34.8 4.2 9 43.2 58.2 51 1.8 45 1.2 45 43.2 37.8 3.6 58.2 1.2 31.2 3
38 37 37 39 41 39 38 41 41 38 38 41 39 40 40 37 40 40 40 41
1.8 30 42 19.8 3 0 22.2 7.2 46.8 43.2 46.2 10.8 37.2 13.2 30 4.8 46.8 10.2 27 13.2
9 34.2 19.8 57 1.2 52.8
44 44 45 43 44 42
28.2 12 33 31.8 25.2 52.8
27 1.2 19.8 10.8 37.2 49.2 22.2 1.2 3
38 37 36 38 37 37 37 37 37
7.8 30 34.2 43.2 7.8 57 4.8 19.8 7.8
16.8 1.2 1.8 1.8 19.8 58.2
36 36 36 38 37 37
55.8 54 49.2 30 30 19.2
51 58.8 28.8
38 36 37
16.2 57 51
31.8 46.2 19.8 28.2 31.2 16.8 39 34.8 3.6 58.2 28.8 19.2 40.8 5.4 31.8 7.2 3 7.2 33 13.2 1.8 9 31.8 34.8 4.8
48 47 48 48 47 47 47 47 46 46 47 47 48 46 48 46 48 46 47 47 47 47 47 47 46
48 28.8 30 52.8 19.2 55.2 37.2 4.8 34.2 58.2 9 12 15 58.2 25.2 16.2 7.2 45 57 30 27 15 37.8 16.2 28.8
LONGITUDE LATITUDE degrees min degrees Walla Walla 118 16.8 46 Wenatchee 120 1.2 47 Whidbey Is 122 39 48 Yakima 120 31.8 46 WEST VIRGINIA Beckley 81 7.2 37 Bluefield 81 13.2 37 Charleston 81 3.6 38 Clarksburg 80 13.8 39 Elkins 79 51 38 Huntington 82 33 38 Lewisburg 80 2.4 37 Martinsburg 77 58.8 39 Morgantown 79 55.2 39 Parkersburg 81 25.8 39 Wheeling 80 39 40 Wh Sulphur 80 1.2 37
LONGITUDE degrees min
min 6 24 21 34.2
WISCONSIN Appleton Eau Claire Green Bay Janesville La Crosse Lone Rock Madison Manitowac Milwaukee Mosinee Neenah Oshkosh Rhinelander Rice Lake Volk Fld Wausau
46.8 18 22.2 16.8 52.8 22.2 52.2 24 39 21 10.8 27.6
88 91 88 89 91 90 89 87 87 89 88 88 89 91 90 89
31.2 28.8 7.8 1.8 15 10.8 19.8 40.2 5.4 40.2 31.8 34.2 27 43.2 16.2 37.2
LATITUDE degrees 44 44 44 42 43 43 43 44 42 44 44 44 45 45 43 44
LONGITUDE degrees min
min 15 52.2 28.8 37.2 52.2 12 7.8 7.8 57 46.8 13.2 0 37.8 28.8 55.8 55.2
WYOMING Big Piney Casper Cheyenne Cody Douglas Evanston Gillette Jackson Lander Laramie Moorcroft Rawlins Riverton Rock Springs Sheridan Worland Yellowstone
110 106 104 109 105 111 105 110 108 105 104 107 108 109 106 107 110
LATITUDE degrees
0.6 28.2 49.2 1.2 22.8 0 31.8 43.8 43.8 40.8 48.6 1.2 27 4.2 58.2 58.2 25.2
CANADA CITY Calgary Churchill Coppermine Edmonton Frederickton Ft Mcpherson Goose Bay Halifax Hazelton Kenora Labrador City Montreal Mt. Logan Nakina Ottawa Peace River Pr. Edward Isl Quebec Regina Saskatoon St. Johns Toronto Vancouver Victoria Whitehorse Winnipeg
PROVINCE Alberta Newfoundland Northwest Terr. Alberta New Brunswick Northwest Terr Newfoundland Nova Scotia BC Ontario Labrador Quebec Yukon Yukon Ontario Alberta Nova Scotia Quebec Saskatchewan Saskatchewan Newfoundland Ontario BC BC Yukon Manitoba
LONGITUDE 114 7 94 0 115 21 113 25 66 40 134 50 60 20 63 34 127 38 94 29 66 52 73 39 140 24 132 48 75 45 117 18 63 9 71 15 104 38 101 32 52 43 79 23 123 7 123 20 135 3 97 9
LATITUDE 51 14 58 45 67 49 53 34 45 57 67 29 53 15 44 39 55 15 49 47 52 56 45 32 60 34 59 12 45 18 56 15 46 14 46 50 50 30 52 10 47 34 43 39 49 16 48 26 60 43 49 53
CITY Glasgow Guatemala City Guayaquil Hamburg Hammerfest Havana Helsinki Hobart Iquique Irkutsk Jakarta Johannesburg Kingston La Paz Leeds Lima Liverpool London Lyons Madrid Manchester Manila Marseilles Mazatlán Mecca Melbourne Mexico City Milan Montevideo Moscow Munich Nagasaki Nagoya Nairobi Nanjing Naples Newcastle Odessa Osaka Oslo Panama City Paramaribo Paris Beijing Perth Plymouth Rio de Janeiro Rome Salvador Santiago St. Petersburg Sao Paulo Shanghai Sofia Stockholm Sydney Tananarive Teheran Tokyo Tripoli Venice Veracruz Vienna Warsaw Wellington Zürich
INTERNATIONAL Aberdeen Adelaide Amsterdam Ankara Asunción Athens Auckland Bangkok Barcelona Belém Belfast Belgrade Berlin Birmingham Bombay Bordeaux Bremen Brisbane Bristol Brussels Bucharest Budapest Buenos Aires Cairo Canton Cape Town Caracas Chihuahua Chongqing Copenhagen Córdoba Darwin Dublin Durban Edinburgh Frankfurt Georgetown
Scotland Australia Holland Turkey Paraguay Greece New Zealand Thailand Spain Brazil Northern Ireland Yugoslavia Germany England India France Germany Australia England Belgium Romania Hungary Argentina Egypt China South Africa Venezuela Mexico China Denmark Argentina Australia Ireland South Africa Scotland Germany Guyana
2 138 4 32 57 23 174 100 2 48 5 20 13 1 72 0 8 153 2 4 26 19 58 31 113 18 67 106 106 12 64 130 6 30 3 8 58
9w 36 e 53 e 55 e 40 w 43 e 45 e 30 e 9e 29 w 56 w 32 e 25 e 55 w 48 e 31 w 49 e 8e 35 w 22 e 7e 5e 22 w 21 e 15 e 22 e 2w 5w 34 e 34 e 10 w 51 e 15 w 53 e 10 w 41 e 15 w
57 34 52 39 25 37 36 13 41 1 54 44 52 52 19 44 53 27 51 50 44 47 34 30 23 33 10 28 29 55 31 12 53 29 55 50 6
9n 55 s 22 n 55 n 15 s 58 n 52 s 45 n 23 n 28 s 37 n 52 n 30 n 25 n 0n 50 n 5n 29 s 28 n 52 n 25 n 30 n 35 s 2n 7n 55 s 28 n 37 n 46 n 40 n 28 s 28 s 20 n 53 s 55 n 7n 45 n
50
COUNTRY Scotland Guatemala Ecuador Germany Norway Cuba Finland Tasmania Chile Russia Indonesia South Africa Jamaica Bolivia England Peru England England France Spain England Phillipines France Mexico Saudi Arabia Australia Mexico Italy Uruguay Russia Germany Japan Japan Kenya China Italy England Ukraine Japan Norway Panama Surinam France China Australia England Brazil Italy Brazil Chile Russia Brazil China Bulgaria Sweden Australia Madagascar Iran Japan Libya Italy Mexico Austria Poland New Zealand Switzerland
LONGITUDE 4 15 w 90 31 w 79 56 w 10 2e 23 38 e 82 23 w 25 0e 147 19 e 70 7w 104 20 e 106 48 e 28 4e 76 49 w 68 22 w 1 30 w 77 2w 3 0w 0 5w 4 50 e 3 42 w 2 15 w 120 57 e 5 20 e 106 25 w 39 45 e 144 58 e 99 7w 9 10 e 56 10 w 37 36 e 11 35 e 129 57 e 136 56 e 36 55 e 118 53 e 14 15 e 1 37 w 30 48 e 135 30 e 10 42 e 79 32 w 55 15 w 2 20 e 116 25 e 115 52 e 4 5w 43 12 w 12 27 e 38 27 w 70 45 w 30 18 e 46 31 w 121 28 e 23 20 e 18 3e 151 0e 47 33 e 51 45 e 139 45 e 13 12 e 12 20 e 96 10 w 16 20 e 21 0e 174 47 e 8 31 e
LATITUDE 55 50 n 14 37 n 2 10 s 53 33 n 70 38 n 23 8n 60 10 n 42 52 s 20 10 s 52 30 n 6 16 s 26 12 s 17 59 n 16 27 s 53 45 n 12 0s 53 25 n 51 32 n 45 45 n 40 26 n 53 30 n 14 35 n 43 20 n 23 12 n 21 29 n 37 47 s 19 26 n 45 27 n 34 53 s 55 45 n 48 8n 32 48 n 35 7n 1 25 s 32 3n 40 50 n 54 58 n 46 27 n 34 32 n 59 57 n 8 58 n 5 45 n 48 48 n 39 55 n 31 57 s 50 25 n 22 57 s 41 54 n 12 56 s 33 28 s 59 56 n 23 31 s 31 10 n 42 40 n 59 17 n 34 0s 18 50 s 35 45 n 35 40 n 32 57 n 45 26 n 19 10 n 48 14 n 52 14 n 41 17 s 47 21 n
42 42 41 44 42 41 44 43 42 41 44 41 43 41 44 43 44
min 34.2 55.2 9 31.2 45 19.8 21 36 49.2 19.2 21 48 3 36 46.2 58.2 33
Appendix D - RS-232 Connection To make a RS-232 connection with the NexStar , the hand control must be in RS-232 mode – which can be accessed through the Menu button. Once in the RS-232 mode, the hand control still has the following abilities:
• • •
Direction buttons – Allowing you to move the telescope in both directions Rate changes – Allows you to change the telescope's rate of speed when using the direction Undo – Use to escape from RS-232 mode.
buttons.
Protocol: NexStar5 communicates at 9600 bits/sec, No parity and stop bit..
All angles are communicated with 16 bit numbers.
Before all commands, the following INITIALIZATION is necessary: PC sends one byte (63=Ascii “?”) to check that NexStar is ready. • NexStar responds with one byte (35) when NexStar is ready to respond. After NexStar sends a 35, the • buttons to the hand control do not respond until the command from the PC has been received, then the direction, rate, and undo buttons are active. Goto RA-Dec positions: INITIALIZATION • PC sends (82=Ascii “R”) • PC sends the RA high byte, RA low byte, Dec high byte, Dec low byte. • When the scope is finished slewing, it will send back a “@”. • Goto Alt-Az positions: INITIALIZATION • PC sends (65=Ascii “A”) • PC sends the Azm high byte, Azm low byte, Alt high byte, Alt low byte. • When the scope is finished slewing, it will send back a “@”. • Get RA-Dec positions: INITIALIZATION • PC sends (69=Ascii “E”) • NexStar sends the RA high byte, RA low byte, Dec high byte, Dec low byte. • Get Alt-Az positions: INITIALIZATION • PC sends (90=Ascii “Z”) • • NexStar sends the Azm high byte, Azm low byte, Alt high byte, Alt low byte.
51
Appendix E – Maps of the Time Zones
52
53
54
55
56
57
58
59
CELESTRON ONE YEAR WARRANTY A.
Celestron International (CI) warrants this telescope to be free from defects in materials and workmanship for one year. CI will repair or replace such product or part thereof which, upon inspection by CI, is found to be defective in materials or workmanship. As a condition to the obligation of CI to repair or replace such product, the product must be returned to CI together with proof-of-purchase satisfactory to CI.
B.
The Proper Return Authorization Number must be obtained from CI in advance of return. Call Celestron at (310) 328-9560 to receive the number to be displayed on the outside of your shipping container. All returns must be accompanied by a written statement setting forth the name, address, and daytime telephone number of the owner, together with a brief description of any claimed defects. Parts or product for which replacement is made shall become the property of CI. The customer shall be responsible for all costs of transportation and insurance, both to and from the factory of CI, and shall be required to prepay such costs. CI shall use reasonable efforts to repair or replace any telescope covered by this warranty within thirty days of receipt. In the event repair or replacement shall require more than thirty days, CI shall notify the customer accordingly. CI reserves the right to replace any product which has been discontinued from its product line with a new product of comparable value and function. This warranty shall be void and of no force of effect in the event a covered product has been modified in design or function, or subjected to abuse, misuse, mishandling or unauthorized repair. Further, product malfunction or deterioration due to normal wear is not covered by this warranty. CI DISCLAIMS ANY WARRANTIES, EXPRESS OR IMPLIED, WHETHER OF MERCHANTABILITY OF FITNESS FOR A PARTICULAR USE, EXCEPT AS EXPRESSLY SET FORTH HEREIN. THE SOLE OBLIGATION OF CI UNDER THIS LIMITED WARRANTY SHALL BE TO REPAIR OR REPLACE THE COVERED PRODUCT, IN ACCORDANCE WITH THE TERMS SET FORTH HEREIN. CI EXPRESSLY DISCLAIMS ANY LOST PROFITS, GENERAL, SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES WHICH MAY RESULT FROM BREACH OF ANY WARRANTY, OR ARISING OUT OF THE USE OR INABILITY TO USE ANY CI PRODUCT. ANY WARRANTIES WHICH ARE IMPLIED AND WHICH CANNOT BE DISCLAIMED SHALL BE LIMITED IN DURATION TO A TERM OF ONE YEAR FROM THE DATE OF ORIGINAL RETAIL PURCHASE. Some states do not allow the exclusion or limitation of incidental or consequential damages or limitation on how long an implied warranty lasts, so the above limitations and exclusions may not apply to you. This warranty gives you specific legal rights, and you may also have other rights which vary from state to state. CI reserves the right to modify or discontinue, without prior notice to you, any model or style telescope. If warranty problems arise, or if you need assistance in using your telescope contact: Celestron International Customer Service Department 2835 Columbia Street Torrance, CA 90503 Tel. (310) 328-9560 Fax. (310) 212-5835 Monday-Friday 8AM-4PM PST This warranty supersedes all other product warranties.
NOTE:
This warranty is valid to U.S.A. and Canadian customers who have purchased this product from an Authorized CI Dealer in the U.S.A. or Canada. Warranty outside the U.S.A. and Canada is valid only to customers who purchased from a CI International Distributor or Authorized CI Dealer in the specific country and please contact them for any warranty service.
Celestron International 2835 Columbia Street Torrance, CA 90503 Tel. (310) 328-9560 Fax. (310) 212-5835 Web site at http//www.celestron.com Copyright 1999 Celestron International All rights reserved. (Products or instructions may change without notice or obligation.)
Item # 11011-INST $10.00
03/00
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