MDM Observatory 2.4m Telescope Observer's Report for 2001 Sep 20

Observer(s): Alves
Institution(s): Columbia

Instrument: 8k

Worked for 10 hours (all night)
Conditions were Mixed most of the night.
Problems were encountered, see the summary for details.

Seeing and Weather:
   Beg: Seeing 1.4 arcsec, Patchy Clouds, Winds Calm
   Mid: Seeing 1.2 arcsec, Patchy Clouds, Winds Calm
   End: Seeing 1.0 arcsec, Patchy Clouds, Winds Calm

Observing Summary:

clouds early, then cleared 
in morning the CCD was at 60 mTorr!
I had filled dewar after dinner and
images were fine during night. 
It looks like it got warm around 4:30,
based on inspection of images
lost vacuum?
I refilled at 5:30 - it dropped to 0.4-0.4.
left at 6am 


~

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Submitted on 2001 Sep 21 [6:02:51]