Weather Report for January 20, 2013

Despite a slightly larger than first quarter moon, this was an excellent night that completed Campaign 46. Except for a few isolated, thin cirrus clouds at the very beginning, it was a photometric night. The seeing was 1.2-1.5 arcsec all night.

Campaign 46 was interesting from two standpoints: (1) Although temperatures during observations ranged incredibly from 10-52 deg F over the course of the campaign, no time was lost to clouds for nine very long nights and periods of really poor seeing were surprisingly short. (2) Plenty of blazars were flaring during the campaign and large polarization fluctuations were seen on daily time scales for several objects. Campaign 47 will begin within two weeks(!) at the Bok Telescope. Not much time to recover.