MDM Observatory 2.4m Telescope Observing Report for 2023 Sep 12

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

Instrument: OSMOS

Worked for 5 hours (off and on through the night)
Bad weather most of the night.
Problems were encountered, see the separate trouble report for details.

Seeing and Weather:
   Clouds all night.
   Beg: Seeing < 1 arcsec, Patchy Clouds, Winds Light &amp; Variable
   Mid: Seeing 1 arcsec, Clear, Winds Moderate
   End: Fog/Low Clouds, Winds Light &amp; Variable

Observing Summary:

Thunderstorms nearby early, then clearing nicely with good seeing,
and occasional cloudy intervals.  

It got cloudier in the second half and felt humid; around 2 AM
the middle of the 4K dewar fogged up.  However, the Davis weather
station read 62 percent, so I soldiered on, cleared the dewar 
with CO2, and so on. But then the whole sky went grey on the 
all-sky camera, with a halo around Jupiter -- it was fog, so I 
closed as quickly as I could manage.  Somewhat later the sky 
was partially clear but the roof was dripping, so that was that.

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Submitted on 2023 Sep 13 [4:49:45]