MDM Observatory 2.4m Telescope Observing Report for 2011 Feb 20

Observer(s): Brendan Miller
Institution(s): University of Michigan

Instrument: CCDS

No Observing (see comments below)
Bad weather most of the night.
Problems were encountered, see the separate trouble report for details.

Seeing and Weather:
   Snow from 1530 until 2300.

Observing Summary:

Rain and snow in afternoon, then overcast. 
Sky cleared somewhat in early morning, but high humidity outside persisted throughout, so dome stayed shut. 

A/C display showed periodic spikes in temperature readings that were clearly inaccurate (e.g., saying dome went from 0 to 20C almost immediately).
Briefly gave message (before returning to normal): system disabled, sensors appear to be malfunctioning.
Seemed to maintain correct control (ie, cooling appropriately, mirror kept above dewpoint) so treated as software/sensor glitch; filed trouble report. 

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Submitted on 2011 Feb 21 [5:57:48]