MDM Observatory 2.4m Telescope Observing Report for 2015 Sep 16

Observer(s): Joel C Zinn
Institution(s): OSU

Instrument: OSMOS

Worked for 4 hours (off and on through the night)
Conditions were Mixed most of the night.
No equipment or software problems were encountered.

Seeing and Weather:
   High Humidity from 4:00 until 10:00.
   Beg: Clear, Winds Calm
   Mid: Seeing 2.4 arcsec, Clear, Winds Light & Variable
   End: Seeing 1.5 arcsec, Clear, Winds Light & Variable

Observing Summary:

Seeing during observing hours ranged from 1.5  to 2.4 , improving over the course of the night as the humidity dropped.
Had to close at 400UTC due to high humidity. Condensation had accumulated on the window by reopening at 1015UTC, which was cleared after observing two SN candidates
in order to ensure some data were taken before humidity rose again. In point of fact, humidity fell from that point onward.
Also observed a MgII absorber, though the red grism did not yield an unambiguous spectrum in 600s for this object with R=17.4.

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Submitted on 2015 Sep 17 [5:37:23]