This is Comet Hartley 2 as it appeared on the night of October 9/10, 2010 as it travelled through Perseus. The comet is the cyan glow at left, wth the Double Cluster at lower right and the complex of red nebulosity of IC 1848 / IC 1805 / IC 1795 at top. Technical: This is a stack of 5 x 2.5 minute exposures at ISO 1600 with Canon 5D MkII on 135mm L-series telephoto lens at f/3.2. Tracked the sky on Kenko SkyMemo tracking platform to follow the stars.
Comet Holmes (17P) at upper left and Comet Tuttle (8P) at lower right (as green spot), taken Dec 29, 2007 with 35mm Canon lens at f/2.8 and Canon 20Da at ISO 400 for stack of 6 x 2.5 minute exposures. Also includes M33 (below Tuttle) and M31, and clusters NGC 752 (middle) and M34 (left beside Holmes).
