MDM Observatory 2.4m Telescope Observer's Report for 2001 Apr 16

Observer(s): scharf
Institution(s): columbia

Instrument: 8k

Worked for 6 hours (most of the night)
Conditions were Non-Photometric most of the night.
No equipment or software problems were encountered.

Seeing and Weather:
   Clouds all night.
   Beg: Seeing 1 arcsec, Patchy Clouds, Winds Calm
   Mid: Seeing 1.5 arcsec, Patchy Clouds, Winds Calm
   End: Seeing 1 arcsec, Patchy Clouds, Winds Calm

Observing Summary:

Clouds to South all night, and overhead for 2-3 hours spread 
over night. Unlikely to be photometric during night.
Seeing moderate to good (1-1.5arcsec).

Minor problem/new condition with guider. Appears to be a gradient
of sensitivity from left to right (east-west) on tv monitor (ie in these
coordinates), such that sources to left show many fewer counts 
and can be hard to guide on, right hand side can have a factor
5 more counts for the same source - I am unaware of any problems
with blocking of the guide field of view, perhaps something has
caused a sensitivity variation across the camera ? Only problematic
when it reduces effective area to find guide stars in.

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Submitted on 2001 Apr 17 [4:14:46]