MDM Observatory 2.4m Telescope Observing Report for 2019 Dec 15

Observer(s): Thorstensen&students
Institution(s): Dartmouth

Instrument: OSMOS/B

Worked for 10 hours (most of the night)
Conditions were Mixed most of the night.
Problems were encountered, see the separate trouble report for details.

Seeing and Weather:
   High Humidity from 10 PM until midn..
   Beg: Seeing 2 arcsec, Clear, Winds Moderate
   Mid: Clear, Winds Moderate
   End: Seeing 1.5-3 arcsec, Patchy Clouds, Winds Light & Variable

Observing Summary:

Mostly clear, but with a few cirrusy intervals toward morning.
Markedly colder, with temperature dropping through the night.
Humidity spiked causing a close at 10 PM, but subsided by 
around midnight so we opened again.  Seeing was largely rather
poor.  Focus also appeared to go soft toward the end.  MIS
required power cycles twice after the guide probe froze.  The 
telescope jumped in RA several times; Katie Weil tightened the
appropriate bolt, which may have helped.  Finally, the dome
shutter made quite a racket near the top of its travel, both
on opening and on closing.  

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

Submitted on 2019 Dec 16 [7:04:10]