Celestron CGEM DX Instruction Manual download pdf (Page 14)

either GoTo Sky Obj or Goto Land

Obj and enter the number of the object

you wish to select and press ENTER. The

telescope will automatically retrieve and

display the coordinates before slewing to

the object.

Save Sky Object Your telescope 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 Sky Obj”

command and press ENTER. The display

will ask you to enter a number between

1-200 to identify the object. Press ENTER

again to save this object to the database.

Save Database This feature allows you to create your own

(Db) Object custom tour of database objects by

allowing you to record the current position

of the telescope and save the name of the

object by selecting it from any one of the

database catalogs. These objects then can

be accessed by selecting GoTo Sky Object.

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 RA-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.

Save Land Object The telescope 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 Land Obj” command

and press ENTER. The display will ask

you to enter a number between 1-200 to

identify the object. Press ENTER again to

save this object to the database.

To replace the contents of any of the user deﬁned objects,

simply save a new object using one of the existing identiﬁcation

numbers;thetelescopewillreplacetheprevioususerdened

object with the current one.

Get RA/DEC — Displays the right ascension and declination

for the current position of the telescope.

Goto R.A/ Dec — Allows you to input a speciﬁc R.A. and

declination and slew to it.

To store a set of coordinates (R.A./Dec) permanently

into the database, save it as a User Deﬁned Object as

described above.

Identify

Identify Mode will search any of the telescope’s database

catalogs or lists and display the name and offset distances

to the nearest matching objects. This feature can serve two

purposes. First, it can be used to identify an unknown object in

the ﬁeld of view of your eyepiece. Additionally, Identify Mode

can be used to ﬁnd other celestial objects that are close to

the objects you are currently observing. For example, if your

telescope is pointed at the brightest star in the constellation

Lyra, choosing Identify and then searching the Named Star

catalog will no doubt return the star Vega as the star you are

observing. However, by selecting Identify and searching by the

Named Object or Messier catalogs, the hand control will let you

know that the Ring Nebula (M57) is approximately 6° from your

current position. Searching the Double Star catalog will reveal

that Epsilon Lyrae is only 1° away from Vega. To use the

Identify feature:

• PresstheMenubuttonandselecttheIdentifyoption.

• UsetheUp/Downscrollkeystoselectthecatalogthatyou

would like to search.

• PressENTERtobeginthesearch.

Note: Some of the databases contain thousands of

objects, and can therefore take several minutes to return

the closest objects.

prECiSE Goto

The telescope has a precise goto function that can assist in

ﬁnding extremely faint objects and centering objects closer to

the center of the ﬁeld of view for astrophotography and CCD

imaging. Precise Goto automatically searches out the closest

bright star to the desired object and asks the user to carefully

center it in the eyepiece. The hand control then calculates the

small difference between its goto position and its centered

position. Using this offset, the telescope will then slew to the

desired object with enhanced accuracy. To use Precise Goto:

1. Press the MENU button and use the Up/Down keys to select

Precise Goto.

• ChooseDatabase to select the object that you want to

observefromanyofthedatabasecatalogslistedor;

• ChooseRA/DEC to enter a set of celestial coordinates

that you wish to slew to.

2. Once the desired object is selected, the hand control will

search out and display the closest bright star to your desired

object. Press ENTER to slew to the bright alignment star.

3. Use the direction buttons to carefully center the alignment

star in the eyepiece.

4. Press ENTER to slew to the desired object.

SCopE SEtup FEaturES

Setup Time-Site — Allows the user to customize the

telescope’s display by changing time and location parameters

(such as time zone and daylight savings).

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 CGEM 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. There are two values for each axis, positive

and negative:

Positive is the amount of compensation applied when you

press the button, in order to get the gears moving quickly

without a long pause.

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Celestron CGEM DX Instruction Manual Page 14

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