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Celestron CGEM DX Manual

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7
2. Align: Instructs the telescope to use a selected star or
object as an alignment position.
3. Direction Keys: Allows complete control of the telescope
in any direction. Use the direction keys to move the
telescope to the initial alignment stars or for centering
objects in the eyepiece.
4. Catalog Keys: The hand control has keys on the hand
control to allow direct access to each of the catalogs in its
database. The hand control 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.
Caldwell — A combination of the best NGC and
IC objects.
Planets — All 8 planets in our Solar System plus
the Moon.
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 telescope’s database have been broken
down into lists based on their type and/or
common name:
Named Stars Common name listing of the brightest
stars in the sky.
Named Objects Alphabetical listing of over 50 of the most
popular deep sky objects.
Double Stars Numeric-alphabetical listing of the most
visually stunning double, triple and
quadruple stars in the sky.
Variable Stars Select list of the brightest variable
stars with the shortest period of
changing magnitude.
Asterisms A unique list of some of the most
recognizable star patterns in the sky.
CCD Objects A custom list of many interesting galaxy
pairs, trios and clusters that are well suited
for CCD imaging.
IC Objects A complete list of all the Index Catalog
deep-sky objects.
Abell Objects A custom list of the Abell Catalog
deep-sky galaxies.
Constellation A complete list of all 88 constellations.
5. Info: Displays coordinates and useful information about
objects selected from the telescope database.
6. Tour: Activates the tour mode, which seeks out all the best
objects for the current date and time, and automatically
slews the telescope to those objects.
7. Enter: Pressing Enter allows you to select any of the
telescope’s functions and accept entered parameters.
8. 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.
9. Menu: Displays the many setup and utilities functions such
as tracking rates and user defined objects and many others.
10. 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.
11. Rate: Instantly changes the rate of speed of the motors
when the direction buttons are pressed.
12. RS-232 Jack: Allows you to interface with a computer and
control the telescope remotely.
Hand Control Operation
This section describes the basic hand control procedures
needed to operate all Celestron computerized telescopes.
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;nally,thelastsectionreviews
all of the utilities functions such as calibrating your mount, polar
alignment and backlash compensation.
aliGnMEnt proCEDurES
In order for the telescope to accurately point to objects in the
sky, it must first be aligned 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 with known coordinates.
There are many ways to align your telescope with the sky
depending on what information the user is able to provide:
Figure 3-1
the hanD Control
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