Weather Report for December 4, 2010

The night started out with light to moderate cirrus, but good progress was made before midnight. Little spectrophotometry could be attempted, but good polarization measurements could be obtained. After midnight, heavier cirrus moved into the area. Observations continued until dawn, but the going was slow and painful. The seeing was spectacular all night long (0.8-1.2 arcsec). This, and the fact that there was no moon, allowed several targets to be observed through the cirrus.