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How do I turn off autoguiding in ACP?
Views: 2926 Last Updated: 2011-05-27 18:35

Q. How do I turn off autoguiding in ACP? I'm using many short exposures and I don't need autoguiding.

A. Autoguiding is automatic; exposures over a certain duration will be autoguided. If you are taking short exposures, autoguiding will also be active if the total time per object is greater than the same duration. For most ACP scopes, the duration is 300 seconds.

If you need a large number of short exposures (e.g., for time series photometry), you can easily set up your plan in a way that will avoid delays from autoguiding.

Writing a Script

The trick is simple: the #count for any single group of exposures should be small enough that count * interval < 300 seconds (or whatever the duration without guiding is for a specific telescope). Here is a script that uses groups of three 90-second exposures to avoid autoguiding (each group is 270 seconds):

#autofocus
#count 3
#interval 90
#binning 1
#filter Clear
ngc 6888    20.2133    38.317
;
#count 3
#interval 90
#binning 1
#filter Clear
ngc 6888    20.2133    38.317
;
#count 3
#interval 90
#binning 1
#filter Clear
ngc 6888    20.2133    38.317

Using Planner

Use the same concept of group_time < 300 seconds, using one horizontal entry for each group. So if you planned to take fifteen 60-second images, you could use groups of 4, 4, 4, and 3 (totaling 15 exposures, each group 240 seconds).

Using the ACP Web Interface

Again, the concept is the same. Using the 'Single Object Color Series', you can create multiple goups, but using the same filter, to get the total number of exposures you want. Just make sure that the count for each line, times the duration, is < 300 seconds.

Single Object Color Series

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