MDM Observatory 2.4m Telescope Observing Report for 2010 Nov 09

Observer(s): Haojing Yan
Institution(s): OSU

Instrument: OSMOS

Worked for 10 hours (all night)
Conditions were Photometric most of the night.
No equipment or software problems were encountered.

Seeing and Weather:
   High Humidity from 09:00 until 06:00.
   Beg: Seeing 1.3 arcsec, Clear, Winds Moderate
   Mid: Seeing 1.5 arcsec, Clear, Winds Moderate
   End: Seeing 1.5 arcsec, Clear, Winds Moderate

Observing Summary:

A very likely photometric night. The seeing was no good (1.3 -1.6 ).
The observations were all in imaging mode. Overall it's a rather
smooth night (well, compared to the previous nights anyway). 

The only big problem was the focus. While this is already known to
everyone, it was still very annoying. The change was not necessarily
monolithic as a function of time or hour angle or even temperature,
which made any attempt to outsmart it look like a joke. During a
couple of hours when the foucs was relatively stable, it was confirmed
that the best focus values for the u'g'r'i' set and the BVRI set
is like focus(ugri)=focus(BVRI)+20.

A couple of long-exposures had problem with the guiding. This will
be described in detail in the trouble report.

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Submitted on 2010 Nov 10 [7:29:23]