With an orbital period of about 5.5 years, Comet 71P/ Clark is a short-period comet that is a member of Jupiter's "family" of comets. Normally a faint comet, it may reach 11th magnitude during a very favourable return, such as the one in 1995.
At magnitude 12.2, this was the faintest comet I had tried to photograph with the 5". The comet is indicated by the lines. The bright star in the image is the 2.1 magnitude star Nunki, or sigma sagittari.
The 2011 return was quite unfavourabe, with the comet being too close to the Sun for observation for several months during perihelion passage.