Weather Report for October 20, 2017

For the third night running, observations had to be made between and through cirrus clouds for most of the night. The sky was clearest during the first 3 hours and last 2 hours of the night. Progress was completely halted by clouds from midnight until 0130 local time. The seeing was around 2 arcsec. Again, photometry is limited, but nearly 20 blazars were measured for polarization.