Manual Celestron CGEM II (page 26 of 161) (English, German, French, Italian, Spanish)

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26 | ENGLISH

Updating your Star Alignment

After polar alignment, it is a good idea to check the pointing

accuracy of the telescope to see how much it may have been

affected by moving the mount. Since the polar alignment

process requires you to “sync” the telescope on a bright

star before you begin, it will be necessary to undo the sync

before re-aligning. To undo the sync:

• Press the Align button and use the Up/Down buttons on

the hand controller to select Undo Sync from the list, and

press Enter. The message Complete will display on the

LCD.

To re-align your telescope:

1. Slew the telescope to one of the original alignment stars

or another bright star if the original alignment stars are

no longer in a convenient location. Press the Align button

and use the Up/Down buttons on the hand controller to

select Alignment Stars from the list.

2. The hand control will ask you which of the original

alignment stars you wish to replace. Use the Up/Down

buttons to select the desired star and press Enter.

3. Once again, center the star in the ﬁnderscope and

press Enter.

4. Center the star in the eyepiece and Press Align.

5. Repeat the process on a second alignment star.

For additional all-sky pointing accuracy, it is a good idea to

align on at least one additional calibration star located on

the opposite side of the Meridian. To add calibration stars:

1. Slew the telescope to a bright star on the opposite side

of the Meridian from your two alignment stars.

2. Press the Align button and use the Up/Down buttons on

the hand controller to select Calib. Stars from the list, and

press Enter.

3. Align the star in the ﬁnderscope and then in the eyepiece

as you did with the alignment stars.

Display Align – the user can now display the polar

alignment error in the RA and DEC axes. These values show

how close the mount is pointed at the celestial pole base on

how accurately the user centered the alignment star with the

hand control and with the mount adjustment. To display the

alignment error:

• Press the Align button and use the Up/Down buttons on

the hand controller to select Display Align from the list,

and press Enter.

Pointing at Polaris

This method of Polar aligning utilizes Polaris as a guidepost

to the celestial pole. Since Polaris is less than a degree from

the celestial pole, you can simply point the polar axis of your

telescope at Polaris. Although this is by no means perfect

alignment, it does get you within one degree and is suitable

for visual observing and short exposure piggyback photography.

This must be done in the dark when Polaris is visible and can

be done using the hole in the polar axis or with the help of

the optional polar axis ﬁnderscope.

1. Set up the telescope so the polar axis is pointing towards

north.

2. Remove the polar ﬁnderscope cover and the polar axis

cover from both sides of the mount. The polar ﬁnderscope

cover unthreads from the rear of the mount, and the polar

axis cover presses into the front of the mount

3. Loosen the DEC clutch knob and move the telescope so

the tube is perpendicular to the polar axis (i.e., the tube

should be pointing either due west or east).

4. Look through the hole located underneath the polar

ﬁnderscope cover (or through the eyepiece if using the

optional polar axis ﬁnderscope). You should be able to

see the sky from the hole under the polar axis cover.

5. Adjust the mount in altitude and/or azimuth until Polaris

is visible through the polar axis hole. Center Polaris as

accurately as possible.

Like the Display Align method, this gets you close to the

pole but not directly on it. For help in identifying and locating

Polaris, read the section below.

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.

Big

Dipper

Lile Dipper

Cassiopeia

N.C.P

Polaris

(North Star)

Pointer Stars

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

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Celestron CGEM II Manual

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