MDM Observatory 1.3m Telescope Observing Report for 2025 Dec 12 Observer(s): John Thorstensen and students Institution(s): Dartmouth Instrument: Templeton direct Worked for 10 hours (most of the night) Conditions were Non-Photometric most of the night. No equipment or software problems were encountered. Seeing and Weather: Beg: Seeing 1+ arcsec, Cirrus, Winds Light & Variable Mid: Seeing 1+ arcsec, Cirrus, Winds Light & Variable End: Seeing 1+ arcsec, Cirrus, Winds Light & Variable Observing Summary: High cloud built in before sunset, but it was mostly optically thin and we worked almost all night. Closed (and filled the dewar) around 4 AM so I could drive the students to the airport. ------------------------------ Submitted on 2025 Dec 13 [8:07:42]