2010-09-07 21:00 UT
200mm f5 Newtonian SW LPR MPCC
Canon EOS 350D Guided
5x60s 5x90s 3x120s subs darks ISO 800
Processed in Nebulosity, PhotoShop CS5
Also 1 frame to show comet against star field without trailing.

From Wikipedia: Comet Hartley 2, officially designated 103P/Hartley, is a small periodic comet with an orbital period of 6.46 years. It was discovered by Malcolm Hartley in 1986 at the Schmidt Telescope Unit in Siding Spring, Australia. Its diameter is estimated to be 1.2 to 1.6 km. It will be the subject of a flyby by the Deep Impact spacecraft on November 4, 2010, with a closest approach of 700 kilometers. This is part of the EPOXI mission.

And here’s NASA’s view of it from the EPOXI mission.