MDM Trouble Report for 2011 Apr 10

Telescope: 2.4m
Observer(s): Stoll (OSU)
Instrument: OSMOS

Problem(s) Encountered:
After two days of >90% humidity, had condensation on the dewar 
window of the 4k.  Possibly simply taking long exposures and 
waiting for it to disappear would have solved the problem; after 
consulting Bob and considering my familiarity with OSMOS, I took 
the quicker and more drastic solution of opening the instrument, 
retracting the camera, and aiming dry nitrogen directly at the 
dewar window, which quickly solved the problem.

The fastest way to solve this problem would be to avoid it in 
the first place.  I caution all OSMOS observers to avoid opening 
the shutter when the humidity is above 80%, night or day.  Resist 
the urge to take daytime calibrations in bad weather!

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

Submitted on 2011 Apr 11 [7:23:49]