2021a1 20211220 0139 molason

Another nice clear evening for viewing the comet except for the just rising Full Moon. The comet was slightly fainter this evening with Astrometrica calculating magnitudes of G=4.3, 4.2, 4.2 and V=4.6, 4.6, 4.5 at 0120, 0124, 0135UT on 2021 December 20 UT using 10x10s green filter images each time. The comet coma was 9' wide and the fan tail >70' at PA 92 degrees before disappearing into the moonlit sky and light pollution. In an attempt to show the structure of the comet coma and tail along with all the colors this comet is showing at an altitude of 6 degrees from the Tucson desert I have include a color image composed of 10x10 seconds each of GRB (in that order).