MDM Trouble Report for 2001 Feb 4

Telescope: 2.4m
Observer(s): S Lepine (Columbia)
Instrument: Mk III spectrograph

Problem(s) Encountered:
1) At the start of the night, it was noticed a feature in the 
biases: a drop by 5-10 counts into a block of 300-400 consecutive
CCD lines. The location of the block would change from bias to
bias. Nothing unusual was noticed in the flats. This had
negligible effect on our observations.

2) At about 1:00AM, it was noticed that the dome slit was 
misaligned with the telescope by 10 degrees, occulting about
20-30% of the field of view. It is not known when or how the
misaligment occured. Dome encoders were reset accordingly.

3) As mentionned in previous night report. We had problems
acquiring our targets on the guider camera. The RA/DEC encoders
were reset on a bright standard at the start of the night. Pointing
on the guide camera (slit mode) would then be off by 1-2 arcmin
on subsequent acquisitions.


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Submitted on 2001 Feb 5 [7:21:28]