MDM Observatory 2.4m Telescope Observing Report for 2010 Nov 10

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

Instrument: OSMOS

Worked for 7 hours (most of the night)
Conditions were Non-Photometric most of the night.
Problems were encountered, see the separate trouble report for details.

Seeing and Weather:
   Beg: Seeing 0.9 arcsec, Clear, Winds Calm
   Mid: Seeing 1.3 arcsec, Clear, Winds Calm
   End: Seeing 1.5 arcsec, Clear, Winds Calm

Observing Summary:

   The night was quite clear, but not likely photometric. All
went well until the observer began to do deep imaging exposures
at around 9:30pm. The same focusing problem that the observer
encountered in the past few nights came again. After struggling
with it for two more hours, the observer decided to switch
to a backup program that does not require very good imaging
quality till the end of the time slot assigned to this deep
imaging program. In the rest of the night, only the spectroscopic
programs and that backup program were executed. 

   The three hours spent on the focusing problem might not be
totally worthless. The observer believes that the source of the 
problem has been located. See the trouble report for details.

    The instrument (OSMOS) itself worked very well. With the
helpful tips from John Thorstensen, the slit acquisition
efficiency has improved by a factor of 3~4, and the imaging
dithering efficiency has also been significantly improved. All
what we need is to let every observer aware of the most efficent
way of operating this instrument.

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Submitted on 2010 Nov 11 [7:14:56]