MDM Observatory 2.4m Telescope Observing Report for 2019 May 13

Observer(s): Oey
Institution(s): Michigan

Instrument: CCDS

Worked for 8 hours (all night)
Conditions were Photometric most of the night.
Problems were encountered, see the separate trouble report for details.

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

Observing Summary:

The grating tilt was at a different position from where we'd
left it.  In trying to reset it, found that the grating tilt 
encoder seems to be off by about 300A.  We set it to 4600A but
it seems centered closer to 5000A or so.  Took quite some time
to figure out.

There was a strange little two-note beep that started going off
randomly for a couple hours or so from maybe 2-4am.  Very faint.  
We spent quite some time trying to figure out the source.  It
wasn't from the dome or computer room.  It seemed to be loudest
in the control room, but it wasn't from any of the speakers.
very mysterious.  Eventually it stopped on maybe the last
object.

The pointing was not as good as the last few days.  The star 
was sometimes outside the slit viewing cam, though not too
far.

Other than that, we had a great night!!!


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Submitted on 2019 May 14 [4:30:09]