Bedienungsanleitung Celestron CGEM II (Seite 25 von 161) (Deutsch, Englisch, Französisch, Italienisch, Spanisch)

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Polar Aligning the Mount

Latitude Scales

The easiest way to polar align a telescope is with a latitude

scale. Unlike other methods that require you to ﬁnd the

celestial pole by identifying certain stars near it, this method

works off of a known constant to determine how high the

polar axis should be pointed. The CGEM II mount can be

adjusted from 15 to 70 degrees.

The constant, mentioned above, is a relationship between

your latitude and the angular distance the celestial pole

is above the northern (or southern) horizon; the angular

distance from the northern horizon to the north celestial pole

is always equal to your latitude. To illustrate this, imagine that

you are standing on the North Pole, latitude +90°. The north

celestial pole, which has a declination of +90°, would be

directly overhead (i.e., 90° above the horizon). Now, let’s say

that you move one degree south — your latitude is now +89°

and the celestial pole is no longer directly overhead. It has

moved one degree closer toward the northern horizon.

This means the pole is now 89° above the northern horizon.

If you move one degree further south, the same thing happens

again. You would have to travel 70 miles north or south to

change your latitude by one degree. As you can see from

this example, the distance from the northern horizon to the

celestial pole is always equal to your latitude.

If you are observing from Los Angeles, which has latitude

of 34°, then the celestial pole is 34° above the northern

horizon. All a latitude scale does then is to point the polar

axis of the telescope at the right elevation above the northern

(or southern) horizon. To align your telescope:

1. Make sure the polar axis of the mount is pointing due

north. Use a landmark that you know faces north.

2. Level the tripod. There is a bubble level built into the

mount for this purpose.

3. Adjust the mount in altitude until the latitude indicator

points to your latitude. Moving the mount affects the

angle the polar axis is pointing. For speciﬁc information

on adjusting the equatorial mount, please see the section

“Adjusting the Mount.”

This method can be done in daylight, thus eliminating the

need to attempt in the dark. Although this method does

NOT put you directly on the pole, it will limit the number of

corrections you will make when tracking an object. It will also

be accurate enough for short exposure prime focus planetary

imaging (a couple of seconds) and short exposure piggyback

astroimaging (a couple of minutes).

Polar Align using the Hand Control

The CGEM II mount has a polar alignment function called

“All-Star” Polar Alignment that will help you polar

align your telescope for increased tracking precision and

for astroimaging. This feature allows you to choose any

bright alignment star to assist in accurately aligning your

telescope’s mount with the North Celestial Pole. Before

using the Polar Align feature, the scope must ﬁrst be roughly

pointed towards north and should be aligned with three

stars in the sky. See the “Latitude Scale” section for help

with ﬁnding north and adjusting the mounts latitude.

Once your telescope is aligned on two stars and at least

one additional calibration star, slew the telescope to any

bright star in its Named Star database list. For best results,

choose a polar alignment star that is high in the sky and near

the Meridian. Try to avoid stars that are close to the west/

east horizon, directly overhead or too near the celestial pole.

Once completed, press the Align button and use the Up/

Down buttons on the hand controller to select Polar Align

from the list.

Align Mount – After performing a two star alignment with one

calibration star and slewing your telescope to any bright star

in the telescope’s database, select the “Align Mount” option.

The telescope will then slew away from and then back to the

same star.

1. The hand control will ask you to re-center the star in the

ﬁnderscope and press ENTER.

2. The hand control will ask you to accurately center the star

in your eyepiece and press ALIGN. The telescope will

then “sync” on this star and slew to the position that the

star should be if it were accurately polar aligned.

Note: For the most accurate alignment, it is best to use a

reticle eyepiece or a high power eyepiece to precisely center

the star in the ﬁeld of view.

3. Use the mount’s latitude and azimuth adjustments to

place the star in the center of the eyepiece. Do not use

the direction buttons on the hand control to position the

star. Once the star is centered in the eyepiece, press

ENTER; the polar axis should now be pointed towards

the North Celestial Pole.

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