Manual Celestron CGEM DX (page 11 of 38) (English)

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2. Once the telescope is ﬁnished slewing to your ﬁrst alignment

star, the display will ask you to use the arrow buttons to align

the selected star with the cross hairs in the center of the

ﬁnderscope. When centered in the ﬁnder, press ENTER.

3. 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 your ﬁrst alignment star.

4. After the ﬁrst alignment star has been entered the hand

control will automatically select a second alignment star and

have you repeat this procedure for that star.

When the telescope has

been aligned on both

stars the display will ask

you if you wish to add

additional calibration stars.

Calibration stars are used

to improve the pointing

accuracy of your telescope

by compensating for

subtle opto-mechanical

misalignments between

the telescope optics and

the mount. Therefore it

is usually a good idea to

add at least one additional

calibration star to improve

the telescope’s all-sky

pointing accuracy.

5. Press ENTER to select a

calibration star. Select a

star the same way you

did with the ﬁrst two

alignments stars and pres

ENTER. You will notice

that all the calibration stars

displayed are located on

the opposite side of the

side of the sky (Meridian)

as the original alignment stars. This is essential for an

accurate calibration of the mount.

Finally you can chose to continue to add additional calibration

stars or Press UNDO to complete the alignment.

Tips for adding calibration stars:

• Althoughforcasualobservingitisnotnecessarytoadd

calibration stars, it is recommended that you add as many

as three calibration stars for optimal point accuracy.

• Calibrationstarsthatareneartheequatorofferthebest

results than stars near the poles.

• Althoughitisnotnecessarytousecalibrationstarsifthe

telescope mount has not been moved since its original

alignment/calibration, it may be necessary to recalibrate

the telescope if the optical tube has been removed for

any reason.

onE Star aliGn

One-Star Alignment works much the same way as Two-Star

Align but uses only a single star in the sky for alignment.

This method of alignment is not as accurate as the two-star

alignment and is recommended only for telescopes that are

permanently and accurately polar aligned.

Solar SyStEM aliGn

Solar System Align is designed to provide excellent tracking

and GoTo performance by using solar system objects (Sun,

Moon and planets) to align the telescope with the sky. Solar

System Align is a great way to align your telescope for daytime

viewing as well as a quick way to align the telescope for

nighttime observing.

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.

1. Select Solar System Align from the alignment options.

2. The SELECT OBJECT message will appear in the top row of

the display. Use the Up and Down scroll keys (10) to select

the daytime object (planet, moon or sun) you wish to align.

Press ENTER.

3. Use the direction arrow buttons to carefully center the object

in the ﬁnderscope. Press ENTER when centered.

4. Then, center the object in the eyepiece and press ALIGN.

Once in position, the telescope will model the sky based on this

information and display Alignment Successful

Tips for Using Solar System Align

• Forsafetypurposes,theSunwillnotbedisplayedinanyof

the hand control’s customer object lists unless it is enabled

from the Utilities Menu. To allow the Sun to be displayed on

the hand control, do the following:

1. Press the UNDO button until the display reads “CGEM

Ready”

2. Press the MENU button and use the Up and Down keys to

select the Utilities menu. Press ENTER.

3. Use the UP and Down keys to select Sun Menu and

press ENTER.

4. Press ENTER again to allow the Sun to appear on the hand

control display.

The Sun can be removed from the display by using the same

procedure as above.

• Toimprovethetelescopepointingaccuracy,youcanusethe

Re-Align feature as described below.

East/West(E/W)Filtering

In order to ensure the best

possible full sky pointing

accuracy, your computerized

telescope automatically

ﬁlters and chooses its initial

alignment stars so that the

ﬁrst two alignment stars are

located on one side of the

Meridian and any calibration

stars are on the opposite side

of the Meridian, as indicated

by the “W” or “E” displayed

in the upper-right corner of

the LCD. East/West ﬁltering

can be changed simply by

pressing the MENU button at

any time during the alignment

process.

Figure 3-3

the MeriDian is an iMaginary 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.

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Celestron CGEM DX Manual

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