MDM Observatory 2.4m Telescope Observing Report for 2017 May 01

Observer(s): Hodges-Kluck, Lee
Institution(s): Michigan

Instrument: OSMOS B4K

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

Seeing and Weather:
   Beg: Seeing 1.1 arcsec, Clear, Winds Calm
   Mid: Seeing 1.1 arcsec, Clear, Winds Calm
   End: Seeing 1.1 arcsec, Clear, Winds Calm

Observing Summary:

The weather and seeing were very good all night long, with almost
no clouds. We observed the main target for most of the night in V
and H-alpha images. 

We noticed part-way through the night that the fluxes in the V
band, but not H-alpha, underwent something like a state change in
which the count total dropped by a factor of ~2 for a given
exposure time and did not recover for the rest of the night. More
details are given in the trouble report, but we are not sure if
this is actually a problem with the telescope/filter.  

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Submitted on 2017 May 2 [5:39:30]