MDM Observatory 1.3m Telescope Observing Report for 2015 May 12

Observer(s): Meghin Spencer
Institution(s): University of Michigan

Instrument: 4K

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

Seeing and Weather:
   Clouds all night.
   Beg: Patchy Clouds, Winds Light & Variable
   Mid: Patchy Clouds, Winds Light & Variable, Humidity 75%
   End: Cirrus, Winds Light & Variable, Humidity 56%

Observing Summary:

Cloudy all of the night (cirrus), but some larger clouds hung around during the first half of the night. 
Guiding failed a couple times because of clouds. We lost a few of our fainter targets from the clouds 
but were able to observe the brighter ones during these times. 
The humidity reached 75% for a while around midnight but then dropped back down.
We filled the dewar at the beginning of the night, 
but around 1am we noticed that the temperature reading was around -80. 
We refilled the dewar but noted that it didn't take very long to refill. 
However, when we checked the temp half an hour later it had cooled down to about -95.
We also noticed that using the  call roi4k  or  call roi2k  commands in Prospero issued a pile of errors.
JSkyCalc froze for a little while too. Just as I was about to restart, it started working again.


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Submitted on 2015 May 13 [5:14:48]