Manual Celestron CPC Deluxe 800 HD - 11007 (page 23 of 50) (English)

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Even though the CPC can precisely track a celestial object while in the

Alt-Az position, it is still necessary to align the polar axis of the telescope

(the fork arm) to the Earth’s axis of rotation in order to do long exposure

astrophotography. To do an accurate polar alignment, the CPC requires

an optional equatorial wedge between the telescope and the tripod. This

allows the telescope’s tracking motors to rotate the telescope around the

celestial pole, the same way as the stars. Without the equatorial wedge,

you would notice the stars in the eyepiece would slowly rotate around

the center of the eld of view. Although this gradual rotation would go

unnoticed when viewing with an eyepiece, it would be very noticeable

when imaging.

Polar alignment is the process by which the telescope’s axis of rotation

(called the polar axis) is aligned (made parallel) with the Earth’s axis of

rotation. Once aligned, a telescope with a clock drive will track the stars

as they move across the sky. The result is that objects observed through

the telescope appear stationary (i.e., they will not drift out of the eld of

view). If not using the clock drive, all objects in the sky (day or night) will

slowly drift out of the eld. This motion is caused by the Earth’s rotation.

>>

The CPC hand control has a polar alignment function called “All-Star”

polar alignment that will help you polar align your telescope for increased

tracking precision and astrophotography. This feature allows you to choose

any bright alignment stars to assist in accurately aligning your telescope and

wedge with the North Celestial Pole. Before using the Polar Align feature,

you must rst perform an EQ North or South Alignment.

Once your telescope is EQ aligned, slew the telescope to any bright star

in its Named Star database list. This will be the star used for the All-Star

Polar Alignment. For best results, it is always good to 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.

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

controller to select Polar Align from the list.

The Polar Align feature has two options: Align Wedge and Display Align.

Align Wedge – After performing an EQ North or South Alignment and

slewing your telescope to any bright star in the telescope’s database,

select the “Align Wedge” option. The telescope will then re-slew to the

same star.

1. Center the star in the nderscope and press ENTER.

2. Then 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.

For the most accurate alignment it is best to use a reticle eyepiece (see

Optional Accessories) or a high power eyepiece to precisely center the

star in the eld of view.

3. Use the wedges latitude and azimuth adjustments to place the

star in the center of the eyepiece. 

  . 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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

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

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



Updating your Star Alignment

After polar alignment, it’s a good idea to check the pointing accuracy

of the telescope to see how much it may have been aected 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:

1. 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:

2. 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.

3. 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.

4. Once again, center the star in the nderscope and press Enter.

5. Then center the star in the eyepiece and Press Align.

6. Repeat the process on a second alignment star.

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 based on how accurately the user

centered the alignment star with the hand control and with the mount

adjustment. To display the alignment error:

1. Press the Align button and use the UP/DOWN buttons on the hand

controller to select Display Align from the list, and press Enter.

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Celestron CPC Deluxe 800 HD - 11007 Manual

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