The Comet - photo 3

Despite moonlight and smoke from wildfires near Los Angeles, Anthony Cook captured the comet at the prime focus of Griffith Observatory's 12-inch Zeiss refractor at 8:30 UT on October 25th. This frame, cropped to 4 arcminutes wide, shows the comet's nucleus slightly off-center in the larger coma. In longer exposures the coma had a well-defined edge, allowing Cook to measure its growth rate. He got a diameter of 86 arcseconds at 7:46 UT, then 89 arcseconds an hour later.

Griffith Observatory / Anthony Cook