Comet 2011 Q4 SWAN

Comet 2011 Q4 SWAN peaked at around 9th magnitude in September 2011 and since then has been fading steadily. At the time of the image below the comet was around 17th magnitude.


Comet 2011 Q4 SWAN. December 30, 2011.
Combination of 5, 3 minute images unfiltered.
SBIG STL-1001E CCD. 20" f/6.8 cassegrain at prime focus.