MDM Observatory 2.4m Telescope Observing Report for 2026 Jan 08

Observer(s): John Thorstensen
Institution(s): Dartmouth

Instrument: OSMOS

Worked for 3 hours (part of the night)
Conditions were Photometric most of the night.
Problems were encountered, see the separate trouble report for details.

Seeing and Weather:
   High Humidity from start until 2:30.
   Beg: Fog/Low Clouds, Winds High
   Mid: Patchy Clouds, Winds Moderate
   End: Seeing 1.5 arcsec, Clear, Winds Moderate

Observing Summary:

The night started with a rain squall that evidently dropped a 
dusting of snow at the end. By about 1:30 it was clear, and by
2:30 the humidity had dropped below the limit, so I opened. The
dome shutter made a cracking sound as it started to move, 
presumably because it had iced up, but it opened without incident
and nothing fell off it.  

I worked normally until about 5:30, and then the dome rotation
froze and I stopped.  The trouble report has more.

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Submitted on 2026 Jan 9 [6:22:05]