Weather Report for January 19, 2013

For most of the night, scattered, thin-to-moderate cirrus was in the sky. These clouds did not slow polarimetry except for some objects located close to a first-quarter moon. Valid photometric measurements, however, were a challenge to obtain. The sky cleared rather well during the last 3-4 hours of the night and the seeing was 1-1.5 arcsec all night long.