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so-artn / ARTN

Arizona Robotic Telescope Network
MIT License
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Write Script that calculates focus from focus-sequence images #19

Closed dsand closed 4 years ago

srswinde commented 6 years ago

Last night I added an rts2 python script that initiates the focus shifting. You can find it here. Eventually we will put the focus calculator in here as well.

you can test this script by associating it with a target in rts2 like:

rts2-target -c C0 -s "exe /home/rts2obs/ARTN/scripts/shiftfocusing.py" <targetid>

or by running it with rts2-scriptexec:

rts2-scriptexec -d C0 -s "exe /home/rts2obs/ARTN/scripts/shiftfocusing.py"

and the shiftfocus will be done wherever the telescope is in the sky currently.

Right now the file is written to shiftfoc.fits, which isn't great because it will overwrite each time. I will try to fix this.

bjweiner commented 6 years ago

Tonight rts2 changed the focus away from the value of 2300 we had determined by hand, winding up around 2480. I think it may be trying to run an autofocusing routine, and I don't know how to enable/disable that. I didn't catch this for a long time and suspect a lot of the data is out of focus.

srswinde commented 6 years ago

To turn off focus run set the shiftfocus value in rts2-mon C0 to false. Though you should never have to do this, it should be done automatically.

It may have become confused because we changed it with the xephem gui.

Another possibility is that I am confused about the focuser settings on RTS2. There are 5, they are written below with their RTS2 descriptions:

I think I move the FOCUS_TAR when I do the focusing script. Maybe this is wrong.

dsand commented 6 years ago

Quick update. I think we want a 1) a good starting value and 2) a good map for seeing how the focus changes with telescope position and temperature.

I think we have this information now.

  1. Based on Betsy's email here: Betsy email We can set the initial focus to 2400, or something close, before our initial focus run?

  2. Go to:CSS_info This shou.d have the CSS-derived focus map on the sky, and info on how the focus changes with temp.

srswinde commented 5 years ago

We are now using T.E. Pickerings focus analysis script which works if there are enough stars on the CCD (5-10). We should come up with some focus fields that will assure we get enough stars at whatever exposure time we deem necessary.