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StarSense Alignment
After you connect CPWI to your Celestron mount and SSAG as
described previously, the Alignment window will appear (Fig. 14) so you
can select a method to align your mount with the night sky. But fi rst,
check the date, time, and location near the top of the window. If you
notice any mistakes, click the "Set Time" or "Set Location" buttons to
adjust.
Fig. 14: The SSAG alignment window in CPWI.
If you are using an AZ mount with an EQ Wedge, select the "EQ Wedge"
option that appears in the top right of the Alignment window. Selecting
this will treat the AZ mount as an EQ mount.
For completely automatic alignment, choose "StarSense Alignment,"
then press the "Begin Alignment" button. The Pointing Model Information
will appear (Fig. 15). In the "Home Switches" section, CPWI asks, "Is
the mount ready to move to the home switches?" If your mount has home
switches (e.g., CGX and CGX-L), click "Ready," and the telescope will
move to its home switches. If your mount does not have home switches
but has index marks, manually move the telescope to its index marks.
If you are using an AZ mount, CPWI will ask you to point your telescope
toward the Northern horizon (i.e. tube horizontal and pointing North).
Point the telescope to the southern horizon if you are in the Southern
Hemisphere. Use the Mount Slew Controls window that appears
onscreen to do this. You don't need to be precise with this step; it's only
an initial position for the alignment routine.
Fig. 15: Pointing Model Info window in CPWI.
If you have not center calibrated your SSAG previously, you should do
so before sky alignment when prompted by CPWI. Unlike the NexStar+
hand control, CPWI requires you to perform center calibraton before sky
alignment. Otherwise, you will need to perform the sky alignment again.
Please refer to the "Center Calibration" section on page 8.
Next, if you are using an EQ mount or AZ mount on an EQ wedge, CPWI
will ask if you would like to polar align. (If you want to polar align your
mount, now is the best time. If you polar align after sky alignment, you'll
need to perform sky alignment again.) To polar align, click "Yes" and
follow the instructions in the Polar Align section on page 8. If you choose
not to polar align, click "No" to move on to sky alignment. You can always
polar align later by selecting the "Polar Align Mount" option from the
StarSense AG menu.
NOTE: Remember, in many cases, you will not need to accurately polar
align your mount to use SSAG, including for autoguiding.
After polar alignment, the window will display "StarSense Alignment"
and prompt you to select an alignment option (Fig. 16).
Fig. 16: StarSense Alignment options in CPWI.
Auto Four Points
Auto Four Points is the most automated alignment choice. SSAG will
automatically slew to four points in the sky to achieve sky alignment. If it
points to an obstruction or otherwise fails to determine its position, the
telescope will simply slew to another point in the sky to obtain another
alignment reference.
Custom Points
Custom Points allows you to defi ne points in the sky where the telescope
slews for alignment. It's a good choice if your observing site has local
obstructions because you can defi ne the alignment points so that the
telescope steers clear of them. If you choose this option, the StarSense
User Interface Auto Alignment Creator window will appear (Fig. 17).
Fig. 17: Auto Alignment Creator window in CPWI.
Click within the chart to select alignment points in the sky. You'll fi nd the
cardinal directions on the perimeter of the chart. The interior of the chart
goes from 0° altitude (i.e., the horizon) at the edge to 90° (i.e., zenith)
at the center. You can choose more than four alignment points if you
wish. For the best results, choose points spaced widely apart and avoid
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