Weather Report for December 5, 2012

As with the previous night, a lot of cirrus had to be contended with, only worse. Very little photometry was attempted, but it was a productive night in terms of spectropolarimetry. Operations were completely halted twice during the night by thicker bands of cirrus and the moon did not help matters after midnight. More than an hour was lost to these clouds and there were other periods when operations were significantly slowed.

The seeing was excellent at around 1 arcsec at the start of the night and held in at around 1.5 arcsec at the end of the night. There were a few periods of 2-arcsec seeing associated with the thicker bands of cirrus moving over the mountain.