Custom R.a. And Dec; Sync To Target; Alignment; Position Of Polaris/Sigmaoct - iOptron CEM40 Instruction Manual

5.1.8. Custom R.A. and DEC

Here you can go to a target by entering its R.A. and DEC coordinates.

5.2. Sync to Target

This operation will match the telescope's current coordinates to the Target Right Ascension and
Declination. It can be used to correct GOTO pointing error. After slewing to an object, press MENU -
then scroll to "Sync to Target" and press ENTER. Follow the screen to perform the sync. Using this
function will re-align the telescope to the selected object. Multiple syncs can be performed if needed.
This operation is useful to find a faint star or nebula near a bright star.
"Sync to Target" will only work after "Select and Slew" is performed. You can change the slew rate to
make the centering procedure easier. Simply press a number (1 through 9) key to change the speed.
The default slew rate is 64x.

5.3. Alignment

This function is used for aligning the telescope to the celestial pole and to create a sky model to
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calibrate the mount's GOTONOVA functionality.
The system provides four alignment methods to calibrate the mount's GOTO function: "Solar System
Align", "One Star Alignment", "Two Star Alignment" and "Three Star Alignment". The "Two Star
Alignment" may be used to refine the polar alignment.
The mount has to be set to Zero Position before performing any alignment.

5.3.1. Position of Polaris/SigmaOct

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This function displays the position of the Pole Star for Quick Polar Alignment using the iOptron
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AccuAlign polar scope. In the Northern Hemisphere the position of Polaris is displayed, while in the
Southern Hemisphere the position of Sigma Octantis is shown.

5.3.2. One Star Alignment

Press MENU => "Alignment" => "One Star Align". A list of alignment stars that are above the horizon
is computed based on your local time and location. With the mount in the Zero Position, use the▲ and
▼ buttons to select a star and press ENTER. Center the target in your eyepiece using the arrow keys.
Press ENTER when finished. If your mount is set up correctly and polar aligned, one star alignment
should be sufficient for good GoTo accuracy. To increase the pointing accuracy over the sky, you may
choose to do a three star alignment.

5.3.3. Two Star Alignment

Two Star Alignment can be used to improve the accuracy of the mount's polar alignment. Press
MENU => "Alignment" => "Two Star Alignment" A list of alignment stars that are above the horizon is
computed based on your local time and location. With the mount at the Zero Position, use the ▲ and ▼
buttons to select the first alignment star and press ENTER. Center the target in your eyepiece using the
arrow keys after the mount slews to it. Press ENTER when finished. The hand controller will prompt you
to choose a second star. After centering the second star, the two-star alignment is finished.
After Two Star Alignment, the altitude and azimuth errors will be displayed. This number can be used
to fine tune the Quick Polar Alignment.
For example, if the screen shows 7.5" low and 4.3" east, it means that THE MOUNT axis is pointing
lower than and to the east of the Celestial Pole.
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