Date:
Wednesday, April 20, 2022
Telescope:
CTIO Blanco 4-m
Submitter:
Antonella Palmese
Submitter Email:
Observer Support:
Hernan Tirado
Night Assistant:
Alberto Alvarez
Also Present:
Alfredo Zenteno, Humberto Orrego
Problems:
r and Y have particularly low zero points based on afternoon calibrations. We are not sure this is OK.
Environment seeing monitor does not work.
We lost about 5 minutes due to bad pointing at the beginning of the night.
20:50 Local time: The telescope operators realized the F/8 chimney cover was missing and went to put it on. 30 minutes were lost because of this. Putting the cover on seems to have improved on the seeing, which went from 3-4 to <2 arcsec. The lack of cover may have been causing heating and turbulence, and in fact Gemini was recording a much lower seeing. CTIO site monitoring is not working for the seeing, so we cannot compare with CTIO environmental seeing to confirm that the lack of cover was the cause.
3:50 Local time: Pointing off by ~40 arcsec for the past few hours, correcting it now.
Program:
| Total Times | Time Observed | Time Engineering | Time lost technical | Time lost weather | Time lost other | Total Program Time |
|---|---|---|---|---|---|---|
| 2022-04-20 | 11.25 | 0.0 | 0.75 | 0.0 | 0.0 | 12 |
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Exposures from 107293 are affected by the alert “Time stamps out of sync”, difference 31 second. It may be a result of today’s power outage that affected exactly that card. It should not be a problem for these exposures though.