MDM Observatory 2.4m Telescope Observing Report for 2025 Sep 15

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

Instrument: OSMOS

Worked for 6 hours (off and on through the night)
Conditions were Mixed most of the night.
No equipment or software problems were encountered.

Seeing and Weather:
   Clouds all night.
   Beg: Seeing 1+ arcsec, Clear, Winds Calm
   Mid: Overcast, Winds Calm
   End: Seeing 1+ arcsec, Patchy Clouds, Winds Calm

Observing Summary:

Pretty clear at start, with fair-weather cumulus dissipating, and
got several good hours.  Around 11 clouds rolled in -- apparently
a backwash from a system near the AZ/NM/Mexico border. I soldiered
on for a while getting nothing, and closed around midnight.  

However I had a critical morning target so I kept an eye on things
and the clouds started to break up around 3, so I opened at 3:30
and miraculously the part of the sky with my target stayed clear.
By dawn conditions were much better.  

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Submitted on 2025 Sep 16 [6:27:44]