MDM Observatory 2.4m Telescope Observing Report for 2012 Jan 24

Observer(s): Pinkney & Pleshinger
Institution(s): Ohio Northern University

Instrument: ModSpec + Nellie

Worked for 9 hours (most of the night)
Conditions were Non-Photometric most of the night.
Problems were encountered, see the separate trouble report for details.

Seeing and Weather:
   High Humidity from 7  until 9 PM.
   Beg: Patchy Clouds, Winds Light & Variable
   Mid: Seeing 1.6 arcsec, Clear, Winds Light & Variable
   End: Seeing 1.5 arcsec, Cirrus, Winds Moderate

Observing Summary:


Slight problem during twilight with OG515 filter blocking the
light path.  Ended up switching to Position 6 (open).  This didn't
seem to change the Ar lines present in comps.  Also had to use the 
black air hose to dry off condensation on the CCD window.  The moisture
probably got there during the dewar fill because the Rel Humidity 
was not yet high in the dome.  It did however climb above 85% around
2:00 UT when we were doing our first star spectrum.  We lost a bit 
over 2 hours to high humidity.  After re-opening we had a pretty
good night.  The RH dropped down to the 60's and it was bit 
breezy at times.
Had to power cycle the rotator once.

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Submitted on 2012 Jan 25 [7:13:37]