MDM Observatory 2.4m Telescope Observing Report for 2019 Jun 08

Observer(s): Ryan Chornock
Institution(s): Ohio University

Instrument: OSMOS/B

Worked for 9.5 hours (all night)
Conditions were Non-Photometric most of the night.
No equipment or software problems were encountered.

Seeing and Weather:
   Beg: Seeing 1.5 arcsec, Cirrus, Winds Light & Variable
   Mid: Seeing 1.3 arcsec, Cirrus, Winds Light & Variable
   End: Seeing 1.5 arcsec, Cirrus, Winds Light & Variable

Observing Summary:

Intermittent cirrus during the night, but mostly clear.

The automatic temperature compensation for the focus had been working most of the run, but over the course of the night I found that the image quality was deteriorating. By ~2am, I noticed that the stars were officially donuts, so I increased the focus target position from 5350 to 5475 and that seemed to work for the rest of the night.

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Submitted on 2019 Jun 9 [5:18:13]