MDM Observatory 2.4m Telescope Observing Report for 2013 May 11

Observer(s): Oey
Institution(s): Michigan

Instrument: CCDS

Worked for 8 hours (all night)
Conditions were Non-Photometric most of the night.
No equipment or software problems were encountered.

Seeing and Weather:
   Beg: Clear, Winds Moderate
   Mid: Clear, Winds Moderate
   End: Clear, Winds Moderate

Observing Summary:

Sky was clear, but clouds were visible on horizon, so good
for relative photometry, but prob not absolute.  

Everything generally went well, except that guider was not behaving
very well.  Problem especially noticeable at larger zenith angles.
Guider position started moving star out of slit.  We had to stop
guiding during some longer exposures, and just monitoring guiding
by hand.  This was similar to what we noticed with the previous 
observers.  We weren't at parallactic angle, so I wonder if it 
may have been due to atmospheric dispersion, but even near 
zenith the guiding is less than ideal.

------------------------------

Submitted on 2013 May 12 [21:23:59]