MDM Observatory 2.4m Telescope Observing Report for 2015 Dec 29

Observer(s): Matthew Penny
Institution(s): Ohio State University

Instrument: OSMOS/R4K

Worked for 1 hours (all night)
Conditions were Non-Photometric most of the night.
No equipment or software problems were encountered.

Seeing and Weather:
   High Humidity from 6pm until 4 am.
   Beg: Fog/Low Clouds, Winds Calm
   Mid: Clear, Winds Calm
   End: Clear, Winds Calm

Observing Summary:

Incomplete fill of dewar morning before resulted in the dewar 
temparature rising to -93, but complete fill in the afternoon 
brought temperature back down without instrument warming further.

Night started very humid after snow during day. Inspected dome
for snow or ice accumulation in daylight, but could see none. KPNO
indicated domes open around 1am, but MDM & ARO humidity 
sensors continued to report high humidity until ~6 am (VLBA sensor 
matched KPNO). At ~4am, concluding that the results were erroneous I 
tentatively opened the dome and watched the dome humitity reading
for any changes. Opening the dome dropped the in-dome humidity by 
~10%, so I turned off the mirror heating/AC and began observing.

Only managed to get a standard star spectrum before twilight 
encroached. Took plenty of darks thru night though, and a nice 
set of sky flats in g.

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Submitted on 2015 Dec 30 [8:25:33]