MDM Observatory 1.3m Telescope Observing Report for 2010 Jun 15

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

Instrument: Templeton Direct

Worked for 8.5 hours (all night)
Conditions were Photometric most of the night.
No equipment or software problems were encountered.

Seeing and Weather:
   Beg: Seeing 1.3 arcsec, Clear, Winds Light & Variable
   Mid: Seeing 1.8 arcsec, Clear, Winds Light & Variable
   End: Seeing 1.5 arcsec, Clear, Winds Light & Variable

Observing Summary:

Basically the same guiding performance as described before:

Telescope still oscillates in N-S direction only.  Sometimes slowly,
but sometimes in a rapid, jerky motion.   This happens not only at
extreme hour angle, but at zenith as well.  Changing the declination
guider rate to 4-5 from the default of 2.0 seems to do a reasonable job
of damping the motion, but it isn't ideal for long exposures, which can
drift in declination after 10 minutes or so.  In this alternative, the 
star remains off center by 0.5-1.5 pixels in x forever, being unable to
get back to the center of the box.  

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Submitted on 2010 Jun 16 [4:37:14]