MDM Observatory 2.4m Telescope Observing Report for 2020 Mar 01

Observer(s): Wei Sun
Institution(s): University of Michigan

Instrument: OSMOS

Worked for 16 hours (all night)
Conditions were Mixed most of the night.
Problems were encountered, see the separate trouble report for details.

Seeing and Weather:
   Clouds from 16:00 until 23:00.
   Beg: Patchy Clouds, Winds Light & Variable
   Mid: Cirrus, Winds Moderate
   End: Clear, Winds Moderate, high humidity

Observing Summary:

Cloudy weather at beginning, and the sky turns to clear at around 23:00pm. High humidity in the morning
(above 80% since 06:00am).

The approaching limit of the telescope was reached around 05:50am, and recovered with hand paddle
(rotation eastward).

Two other things should also be noticed:
1. several dark spots exist in every image (the most prominent one is at around (1930, 2464) of image
coordinate: those spots even exist in the data we obtained in January! I suspect there are some dirt on
the detector;
2. When I took the Hg+Ne lamp spectrum, some lines looks much fainter than several days ago. I suspect
that the Neon light becomes dim during the past week.

------------------------------

Submitted on 2020 Mar 2 [7:46:40]