C/103P Comet Hartley2

Comet Hartley2 was discovered in March 1986 at Siding Spring Observatory, Australia. In 2010 during its journey into the inner solar system, the comet was the subject of the EPOXI mission to photograph the comet up close. The mission was highly successful and results were spectacular. Here's some more background about Comet Hartley2 and the mission.

Here's a view taken against the stars of Monoceros.