MDM Observatory 1.3m Telescope Observing Report for 2011 Aug 26

Observer(s): Jules Halpern
Institution(s): Columbia U.

Instrument: R4k

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

Seeing and Weather:
   Beg: Seeing 1.2 arcsec, Overcast, Winds Light & Variable
   Mid: Seeing 1.2 arcsec, Patchy Clouds, Winds Moderate
   End: Seeing 1.2 arcsec, Patchy Clouds, Winds Light & Variable

Observing Summary:

First object was a standard star.  Virtually all of its images 
were doubled by 2-2.5 arcseconds as described in the trouble 
report.   After an hour, had to close for rain.  Opened again
after a couple of hours.  Was able to observe my main program
object for 5 hours with no doubled images,  However, at one
point the images made a permanent jump by about 11 arcseconds 
in a diagonal direction.  The latter, by the way, is vintage 
behavior of this telescope that no one has ever explained.
The final object was a standard star, for which the doubled
images returned.  This night is therefore a duplicate of last
night's behavior as far as the doubled images are concerned.

So. Any ideas ???  This is not a lecture class . . .

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Submitted on 2011 Aug 27 [5:49:57]