MDM Observatory 1.3m Telescope Observing Report for 2021 Apr 07

Observer(s): Yuming Fu, Jiangtao Li
Institution(s): PKU, UMich

Instrument: CCDS

Worked for 9 hours (all night)
Conditions were Non-Photometric most of the night.
No equipment or software problems were encountered.

Seeing and Weather:
   Beg: Seeing 1.0 arcsec, Clear, Winds Calm
   Mid: Seeing 1.0 arcsec, Clear, Winds Calm
   End: Seeing 1.2 arcsec, Clear, Winds Calm

Observing Summary:

The observation went well except I spent some time testing the 
positioning calibration. On the previous day, the telescope was 
zeroed at the zenith in the end of the observation. During this 
night, I zeroed the telescope with J2000 coordinates of a target 
(along with equinox=2000) when it was in the center of the field. 
It turned out that the positioning after this adjustment did not 
work well for a few other sources, especially those with high
declination. In contrast, zeroing the telescope using spectro
-scopic standard stars works much better. 
The weather was still good. Few very thin clouds might have
been in the sight lines, making the sky less clear at some
point in the first half of the night. Dome closed at 05:20 am.

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Submitted on 2021 Apr 9 [8:30:47]