Comet 2005 B1 Christensen

Comet 2005 B1 Christensen was a rather distant comet (perihelion 3.2AU) that remained around 16th magnitude for about 2 years.

Comet 2005 B1 Christensen. June 1, 2005.
Combination of 3, 3 minute images, SBIG ST-9XE CCD.
10" f/6.3 schmidt-cassegrain at prime focus.