MDM Observatory 2.4m Telescope Observing Report for 2019 Jan 18

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

Instrument: OSMOS/B

Worked for 5 hours (off and on through the night)
Conditions were Mixed most of the night.
No equipment or software problems were encountered.

Seeing and Weather:
   High Humidity from 8 PM until 2:30 .
   Beg: Seeing 1+ arcsec, Clear, Winds Moderate
   Mid: Fog/Low Clouds, Winds Moderate
   End: Seeing 4-5 arcsec, Clear, Winds High

Observing Summary:

The night looked good starting out, but then about an hour after
twilight the humidity shot up and fog was scudding over the 
observatory maybe a couple hundred feet up.  Closed quickly; 
fog dissipated fairly soon, but humidity was well above limit 
until about 2:30 AM, when it started falling rapidly.  Opened 
a bit after that, to find that the windy and cold conditions were
producing some almost comically poor seeing.  Worked on bright
targets.

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Submitted on 2019 Jan 19 [7:20:37]