MDM Observatory 2.4m Telescope Observing Report for 2024 Jun 14

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

Instrument: OSMOS

Worked for 7.5 hours (all night)
Conditions were Photometric most of the night.
No equipment or software problems were encountered.

Seeing and Weather:
   Beg: Seeing 1.5 arcsec, Clear, Winds Moderate
   Mid: Seeing 1.3 arcsec, Clear, Winds Light & Variable
   End: Seeing 1.3 arcsec, Clear, Winds Calm

Observing Summary:

A beautiful night, clear from dusk to dawn, and with less smoke -
Kitt Peak was open all night.  

Everything worked well, but I did have an issue early on -- On my
evening flatfields, there was a blurry dark blob several hundred
pixels across.  This moved around from frame to frame and was 
consistent with dispersed flats (solar spectrum with slit and 
disperser) and direct images (no slit or disperser), so it had 
to have been on the dewar window.  All evidence was consistent
with a ladybug, which have been a plague.  It went away on my
first science exposure and never came back, thankfully!  I don't
know how it got in the instrument. 

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Submitted on 2024 Jun 15 [5:07:11]