comet Pat Pinnell Image taken: Dec. 25, 2007 Location: Villa Ridge, Mo. Details: This is the fastest motion of any comet I've seen. These 2 exposures were taken less than 45 minutes apart. 102mm refractor, Canon EOS 300D, ISO 800, 2 1/2 minute exposure. ©2013, SpaceWeather.com -- This site is penned daily by Dr. Tony Phillips.