MDM Observatory 2.4m Telescope Observing Report for 2012 Dec 17

Observer(s): Haojing Yan & Zhiyuan Ma
Institution(s): University of Missouri-Columbia

Instrument: OSMOS + B4K

Worked for 10 hours (all night)
Conditions were Non-Photometric most of the night.
No equipment or software problems were encountered.

Seeing and Weather:
   Beg: Seeing 1.5 arcsec, Clear, Winds Calm
   Mid: Seeing 1.2 arcsec, Clear, Winds Light & Variable
   End: Seeing 1.5 arcsec, Patchy Clouds, Winds Light & Variable

Observing Summary:

It was pretty clear most of the night, however clouds came up from
all over the horizon at around 5:00am MST. The temperature varied
by quite a lot throughout the night, from ~ 10 deg C at the beginning
to 4.0 deg C at 3-4am MST, and it came up to ~ 5-6 deg C in the last
two hours before twilight. The highly variable temperature might be
the reason that we could not get stable focus.

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Submitted on 2012 Dec 18 [7:30:02]