MDM Observatory 2.4m Telescope Observing Report for 2009 Sep 20 Observer(s): O'Connor/Crotts/collaborators Institution(s): BNL/Columbia/IAA Instrument: User instrument LSST Prototype Worked for 11 hours (all night) Conditions were Mixed most of the night. No equipment or software problems were encountered. Seeing and Weather: Beg: Seeing 1.2 arcsec, Patchy Clouds, Winds Calm Mid: Seeing 1 arcsec, Cirrus, Winds Calm End: Seeing 1 arcsec, Cirrus, Winds Calm Observing Summary: Less windy than previous night, seeing slightly worse. Thin cloud toward end of night. ------------------------------ Submitted on 2009 Sep 21 [4:45:40]