MDM Observatory 2.4m Telescope Observing Report for 2025 Sep 11

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

Instrument: OSMOS

Worked for 2 hours (part of the night)
Conditions were Non-Photometric most of the night.
No equipment or software problems were encountered.

Seeing and Weather:
   High Humidity from 10 PM until end.
   Beg: Seeing 1.5 arcsec, Patchy Clouds, Winds Light & Variable
   Mid: Patchy Clouds, Winds Light & Variable
   End: Fog/Low Clouds, Winds Light & Variable

Observing Summary:

No raindrops or big storm in the evening, but after I opened
just before sunset some more substantial clouds came over and I
closed in case they generated sprinkles.  It was reasonably clear
late in twilight so I opened and took data for a couple of hours
as the humidity crept up. It got to be too much by about 10 PM,
so I closed up; as of 3 AM, we've been in heavy fog for a few 
hours so I'm calling it a night. 

I was working near the zenith and kept a trickle of dry N2 
flowing into the instrument, so none of the data showed any 
effects of window fogging.


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Submitted on 2025 Sep 12 [3:37:36]