Location of Photo:
Lorton, Virginia, USA
Date/Time of photo:
8 Nov. 2007, 16:02 UT
Canon 10D digital camera at prime focus of Celestron C90, 90mm F/11. 30 second exposure.
The diameter appears to be 0.325 degrees (20 minutes) or 62.5% the diameter of the sun. If the comet is 150 million miles away, that would make the diameter of the coma, visible in this photo, about 850,000 miles.