MDM Observatory 1.3m Telescope Observing Report for 2018 Sep 03

Observer(s): John Thorstensen
Institution(s): Dartmouth

Instrument: modspec + echelle CCD

Worked for 5 hours (off and on through the night)
Conditions were Non-Photometric most of the night.
No equipment or software problems were encountered.

Seeing and Weather:
   Clouds all night.
   Beg: Seeing 1+ arcsec, Patchy Clouds, Winds Light & Variable
   Mid: Seeing 1+ arcsec, Patchy Clouds, Winds Light & Variable
   End: Seeing 1+ arcsec, Patchy Clouds, Winds Light & Variable

Observing Summary:

Some clear time with decent seeing, but mixed with frequently 
cloudy spells and humidity flirting with the limits.  I closed for
a while when the dewar fogged up; Justin purged it, and I took
some more data, only to have it fog up again even with the 
humidity below the nominal limit.  This isn't quite a trouble-report
issue, but it's odd -- I've never seen it fog that easily and
I wonder if the vacuum could be a little soft, or something. It
wasn't of that much consequence since the weather wasn't great
anyway, and I had another program using the Andor slit-viewer
to do eclipse timings.  

I closed a little before twilight because it clouded up -- Kitt
Peak called them  threatening clouds .  I found that the 
dropleaf and slit wouldn't close; once again, rslit had stopped
on its own, so I did a telescope stop and a telescope start and
then they closed properly.

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Submitted on 2018 Sep 4 [4:56:23]