Weather Report for January 20, 2018


This was a very windy night, but it was photometric up until the last couple of hours when high cirrus clouds associated with a strong cold front advancing from the west through Arizona made it to Kitt Peak. As many objects were observed as during the previous night, but tonight photometric data could be obtained for nearly every blazar observed. The seeing was 1-1.5 arcsec throughout the night, but the image quality was degraded somewhat for a few objects because the wind shook the telescope whenever the dome slit was facing into the wind.