MDM Observatory 2.4m Telescope Observing Report for 2009 Apr 04

Observer(s): M. Kilic
Institution(s): OSU/CfA

Instrument: Direct Echelle

Worked for 9 hours (all night)
Conditions were Mixed most of the night.
No equipment or software problems were encountered.

Seeing and Weather:
   Clouds from 01:30 until 05:15.
   Beg: Seeing 1 arcsec, Clear, Winds Calm
   Mid: Seeing 1.5-2 arcsec, Clear, Winds Calm
   End: Seeing 2 arcsec, Patchy Clouds, Winds Calm

Observing Summary:

The night started as photometric with seeing around 1 . However,
the ambient temperature fell below the primary mirror temperature
in a few hours. The mirror cooling system has worked all day but
it was not able to cool the mirror enough. I suppose due to this
and possibly other external reasons, the seeing climbed up to
1.5-2  and stayed like that for the most of the night. In
addition, thin cirrus and later clouds showed up.
Once in a while the seeing would get as good as 1.1 .

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Submitted on 2009 Apr 5 [6:04:13]