MDM Trouble Report for 2008 Dec 22

Telescope: 1.3m
Observer(s): Nathan Crockett (University of Michigan)
Instrument: Nellie

Problem(s) Encountered:
During the second part of the night the telescope would wobble 
along dec. I first noticed this in the guider camera when the
guider would lose the guide star. The guide star would bounce back
and forth along the North/South axis. The movement seemed random.
I thought it might be a problem with the guider, but the problem
persisted even if I turned off guiding. The magnitude of the 
wobble could get as large as an arc minute. As a result, many of 
the images I took during the second part of the night look like 
they contain vertical lines, instead of well defined PSF's. 

Winds were not particularly strong last night (10-15 mph), so I'm 
not sure that was the problem. 

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Submitted on 2008 Dec 22 [5:43:52]