MDM Observatory 2.4m Telescope Observing Report for 2014 Nov 18

Observer(s): Dan Gifford
Institution(s): Michigan

Instrument: OSMOS

Worked for 6 hours (first half of the night)
Conditions were Photometric most of the night.
Problems were encountered, see the separate trouble report for details.

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

Observing Summary:

After taking several science exposures, I noticed several  splotches  on the images 
which were rather large. During a previous run, Eric let me know that this can be due 
to moisture buildup, and using the nitrogen air tank for 5-15 minutes with a light 
amount of air flow can solve this issue. After attempting to do so, the problem got worse 
and continued to worsen despite attempting only once. I closed at 4:30 as the problem 
didn't get better. There was low humidity in the air (~10%) and no wind throughout the night.

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

Submitted on 2014 Nov 19 [4:26:14]