MDM Observatory 2.4m Telescope Observing Report for 2025 Dec 20 Observer(s): Meghna Sitaram, David Schiminovich Institution(s): Columbia Instrument: CHaS Worked for 12.5 hours (all night) Conditions were Non-Photometric most of the night. No equipment or software problems were encountered. Seeing and Weather: Beg: Cirrus, Winds Calm Mid: Clear, Winds Calm End: Clear, Winds Calm Observing Summary: Installed another new custom narrowband filter centered at a slightly higher redshift and used it to observe some fun new galaxy targets. Some cirrus in the beginning of the night but overall nice weather and collected some great calibration and science data ------------------------------ Submitted on 2025 Dec 21 [7:10:05]