Celestron NexStar 102GT User manual

1. Your NexStar 102GT includes optical tube,
pre-assembled tripod, Computerized Hand
Control, computerized hand control holder,
erect image diagonal, eyepiece kit, StarPointer
finderscope, accessory tray, battery pack,
documentation, including an owner’s manual,
and TheSkyX®CD.
2. Assemble tripod by spreading the legs out
until the center leg brace is fully extended.
3. Extend tripod legs 6 to 8 inches by loosening
the tripod leg locking knob and pulling the leg
to desired length and re-tightening knob.
4. All three legs should be the same length to
provide a level platform for the telescope.
A bubble level is included (inset) to assist
in leveling.
5. Place accessory tray on top of center leg
brace by lining up the grooves on the tray to
the post on the brace.
6. Once grooves are aligned, turn accessory
tray until it snaps into clips on each leg brace.
7. Hold the telescope fork arm and place the
bottom of the base inside the tripod mounting
platform as shown.
8. Thread the coupling screw into the hole at
the bottom of the fork arm base. Tighten screw
to secure the fork arm.
9. Slide the optical tube dovetail into the fork
arm as shown above.
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COMPUTERIZED TELESCOPE
QUICK SETUP GUIDE

Quick Setup Guide [cont.]
10. Secure optical tube to fork arm by tighten-
ing the screw located on the inside of the fork
arm assembly.
11. To attach the StarPointer finderscope,
loosen the silver screw and slide StarPointer
finderscope into mounting platform.
12. Secure StarPointer finderscope to mounting
platform by tightening the silver screw. The glass
window of the StarPointer finderscope should be
facing towards the front of the telescope.
13. Insert the chrome barrel of the star diagonal
into the focuser and tighten the silver screw to
secure in place.
14. Select the low power (25 mm) eyepiece
and insert it as shown above. Tighten silver
screw to secure.
15. Attach plastic hand control holder to the
tripod leg.
16. Slide Computerized Hand Control into
the holder as shown above.
17. Plug Computerized Hand Control into the
port on the fork arm.
18. Before you begin viewing, please remember
to remove tube lens cap.
19. While observing, tube should be positioned
as shown above.
20. Before use, put 8 AA batteries (not in-
cluded) in the battery pack. Attach the battery
pack to the tripod by hanging the strap from
the tripod leg locking knob.
21. To turn on telescope, plug the battery pack
into the outlet on the base of the fork arm –
there is no on/off switch.
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Before you can begin observing, you must set up your Computerized
Hand Control, align your StarPointer finderscope and align your telescope.
Step by step instructions are included in the following Computerized Hand Control Guide.

4. Use the Computerized Hand Control direction
arrow buttons to point telescope at a distant
land object during daytime, like a telephone
pole, or at night you can use the moon. Center
and focus the object in the 25 mm eyepiece of
the telescope.
5. In order to accurately center an object in the
eyepiece it may be necessary to change the
slew speed of the motors. To change the slew
speed, press the RATE button then select a
number from 1 (slowest) to 9 (fastest).
6. With the object centered in the eyepiece, use
the azimuth (right/left) and altitude (up/down)
adjustment knobs on the StarPointer finder-
scope to place the red alignment dot directly
over the centered object.
7. Once you have aligned your StarPointer
finderscope, make sure to turn off the LED light
to conserve the battery. Now you are ready to
align the telescope. This will have to be done
at night.
8. When the display reads NexStar GT, press
ENTER to begin the alignment procedure
as prompted.
9. Use the UP and DOWN scroll buttons (lo-
cated on #6 and #9) to select “SkyAlign” then
press ENTER. Now you will need to enter your
site/time information.
10. The Computerized Hand Control will display
the last entered time and site information.
Since this is your first time using the
NexStar, press UNDO to enter your time
and site information.
11. Press ENTER to select City Database. Use
the UP and DOWN scroll buttons (located on
#6 and #9) and choose the closest city to your
present location. Press ENTER after selecting
the country, state and city.
12. Using the numeric key pad enter your time
information. Press ENTER to continue. Press
UNDO to backspace.
1. The power to the mount is on whenever the
battery pack is plugged into the power outlet.
The light will be on and the Computerized Hand
Control will display “NexStar GT”.
2. You will notice that there are directional
arrows in the center of the Computerized Hand
Control. These only move the telescope. They
cannot be used to scroll through menu features.
3. Now you will need to align the StarPointer
finderscope. Turn on the red LED light by turn-
ing the knob shown above. When used for the
first time, remove the clear plastic disk that is
located between the battery clip and the battery.
See inset.
Before you can begin using your NexStar 102GT, you must set up your Computerized Hand Control and go through the SkyAlign alignment pro-
cedure. In order for the NexStar to accurately point to the objects in the sky, it must first align with 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 in its database.
Computerized Hand Control Guide
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On Switch
On Switch

16. If the StarPointer finderscope has been
properly aligned, the alignment star should now
be visible in the field of view of the eyepiece.
17. The Computerized Hand Control will prompt
you to center the bright alignment star in the
center of the eyepiece. Once centered, press
ALIGN. This will accept the star as your first
alignment position.
18. For the second alignment object, choose a
bright star or planet as far from the first align-
ment object as possible. Once again use the
directional arrow buttons to center the object in
the StarPointer finderscope and press ENTER.
Once object is centered in the eyepiece,
press ALIGN.
19. Repeat the process for the third alignment
star. When the telescope has been aligned
to the final star, the display will read “Match
Confirmed”. Press UNDO to display the names
of the three bright objects you aligned to,
or press ENTER to accept these three objects
for alignment.
20. Now that your telescope is properly
aligned, you are ready to find your first object.
Press the TOUR button on the Computerized
Hand Control. The Computerized Hand Control
will display a list of objects that are visible for
the date and location entered.
21. Press INFO to read information about the
object displayed. Press the DOWN scroll key to
display the next object. Press ENTER to slew
(move) to the displayed object.
13. Now, using the UP and DOWN scroll but-
tons (located on #6 and #9), verify the time
zone you are in and press ENTER.
14. Using the numeric key pad, enter the date.
Press ENTER to continue. Press UNDO
to backspace.
15. Use the directional arrow keys on the
Computerized Hand Control to slew (move) the
telescope towards any bright celestial object
in the sky. Center the object in the StarPointer
finderscope and press ENTER.
For general usage information, please consult your user’s manual.
If you have questions or problems with setup, please contact Celestron Technical Support: 310.803.5955
Computerized Hand Control Guide [cont.]
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StarPointer
Finderscope
Alignment
Star
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