Page Comparison

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• Transfer code works. The images are written to the internal disk and then transferred to the external disk.
• Sources are consistent through 22:45 Chile time
• The camera is moving to the left with a rate of 2 pixels for 500 frames, this was 488
• Actually no turning left, the images started moving right, this is 1276
• We may see huge differential image motion. Or it may cancel out in the COM frame.
• We were taking 5 second exposures, from 11 until 322.
• Started 1, 10, 30  second exposures with 323
• Started 1, 5, 10, 30 second exposures with 326
•  Frame 2110, still all sources detected.
• Time 23:33, rotating the dome and taking pictures with the best exposure. Planning to take an additional hour of data after this.
• 23:48 dome opened up more in addition to rotation.
• 23:50, tried 3072, focus gone, going to run back.
  
  
• Went up to dome and refocused. New data is in observe-readjust folder
• We find decent sources but it looks like we have a significant shift to left. This time for real.
• Will start taking flats at 1AM.
• The files source locations got fixed again. No left shift.

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• Took flat files with dome closed to see the background light. Here is the summary table for the night of 12/13/22:

  Exposure ID	Exposure Time (s)	filter	AT azimuth	AT elevation	flash (y/n)	ND filter	computer screen status		count
  435	60	none	270	20	n	1,50	all screens off		4
  436	60	none	270	20	y	1,50	all screens off		4
  437	60	none	215	20	n	1,50	all screens off
  438	60	none	215	20	y	1,50	all screens off
  439	60	none	315	20	n	1,50	all screens off
  440	60	none	315	20	y	1,50	all screens off
  441	60	none	270	50	n	1,50	all screens off
  442	60	none	215	50	y	1,50	all screens off
  443	60	none	270	50	n	1,50	all screens off
  444	60	none	270	50	y	1,50	all screens off
  445	60	none	315	50	n	1,50	all screens off
  446	60	none	315	50	y	1,50	all screens off
  447	60	none	215	50	n	1,50	all screens off
  448	60	none	215	50	y	1,50	all screens off

  We were only able to check the count of the first two images, they were both approximately 4. The absolute difference was negligible, Tiago suggested dividing the flash pictures by non flash pictures.

Images From Different Times of Focusing from the night of 13/12/22:

• The different centeroids will be available in the final jupyter notebook.
• The fixed focus before the trials start:
  Image Added
  That was the best I got at the limited time. It still gave decent sources.
• Focus when I checked to see what went wrong around midnight:
  Image Added
  At that point, it looked good which was shocking but it may have been slightly tilted. I readjusted the focus when I went up just in case.
• The final state of the pegboard after readjustment:
  Image Added
  I am aware I should have documented the final focus as well. I unfortunately did not. It had looked okay and I wanted to get out of the dome to not have any background light while the observations were running.
• A possible camera issue: The camera names files from 0 9999. After it reaches 9999 it goes back to 0. If we get more than 10000 photos in a run, that may be a problem because the files with the same name will be in the same directory. I can try to write a python script to add some sort of an additional extension or time stamp to the names of the files.

From Stubbs:
Ok sounds like a partial success. I think the key think is to get a good dome-closed vs. dome-open comparison. 
I don't understand the longer exposures. Is that with a single flash per image? If so then all the longer images would seem to do is add to the background and not the signal. Or are you running with constant light source? 
I can certainly believe that dome rotation shakes things- During most image the dome is not rotating. 
The focus change could well be due to temperature change of the lens. I can't remember if there is an f-stop ring on that lens or not... I think not. The depth of focus will increase if you make a smaller aperture in front of the lens. There is heavy duty Aluminum foil in the cardboard fan box at the base of the pier. You could try making a snout with a 1 inch off-axis hole and see if that (with reducing ND filter) helps with focus.

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