MDM Observatory 2.4m Telescope Observing Report for 2023 Dec 12 Observer(s): Ignacio Cevallos-Aleman, Nicole Melso, Quinn Casey Institution(s): Columbia Univeristy Instrument: CHaS Worked for 12 hours (all night) Conditions were Photometric most of the night. No equipment or software problems were encountered. Seeing and Weather: Beg: Clear, Winds Calm Mid: Clear, Winds Calm End: Clear, Winds Calm Observing Summary: Excellent conditions all night, we observed NGC 660 and NGC 2146. Also tested the SII filter in CHaS for the first time. ------------------------------ Submitted on 2023 Dec 13 [6:26:38]