MDM Observatory 2.4m Telescope Observing Report for 2026 Jan 09

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

Instrument: OSMOS

Worked for 8 hours (most of the night)
Conditions were Mixed most of the night.
No equipment or software problems were encountered.

Seeing and Weather:
   Beg: Clear, Winds High, too humid. 
   Mid: Seeing 2 arcsec, Clear, Winds High
   End: Seeing 3 arcsec, Clear, Winds Above Limit

Observing Summary:

Mostly clear at sunset but with rising humidity and scraps of 
fog blowing close overhead. Opened the dome partway to let water 
drain out of the places it catches, then closed.  The humidity
dropped rapidly around 9:30 PM and never rose again; I was open
by 9:30, and Kitt Peak opened an hour later. It stayed pretty 
breezy, though, with mediocre seeing, so I worked on brighter
objects. The wind remained all night, with a few gusts above 
40 in the last hour before I closed, about an hour before twilight,
due to wind.  Oddly, Kitt Peak never did close.  

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Submitted on 2026 Jan 10 [6:38:11]