MDM Observatory 2.4m Telescope Observing Report for 2023 Dec 10

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

Instrument: OSMOS

Worked for 13 hours (all night)
Conditions were Non-Photometric most of the night.
No equipment or software problems were encountered.

Seeing and Weather:
   Beg: Seeing 1+ arcsec, Clear, Winds Calm
   Mid: Seeing 1 arcsec, Cirrus, Winds Calm
   End: Seeing 1 arcsec, Cirrus, Winds Calm

Observing Summary:

Light cirrus later in the night but all usable. No problems.

I set the focus compensation to truss arms rather than the 
default center section, and the focus seemed to hold pretty 
well all night.  I wonder if the temperature compensation was
actually working on previous nights, or if the truss arms choice
was responsible.  I remember that the original study by Tonry
and others showed a tight relationship between truss arm
temperature and focus value, so this seems possible at least.

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Submitted on 2023 Dec 11 [7:08:21]