2010-10-13 Comet 103P Hartley 2 - Wide view Stacked on Stars
On this night I captured Comet Hartley with my camera piggy-back on my telescope, through a zoom lens (Canon T1i, 300mm, F5.6, ISO3200). It's a wide view, 4 full moons could span the height of this image.
40x 30 second exposures were shot between 11:17pm and 11:50pm PST, so this image shows 33 minutes of the comet's path and used 20 minutes total exposure time.
Stacked on the stars with Deep Sky Stacker 3.3.3 b25, 'Maximum' formula.
I had some trouble stacking this one, 'Maximum' really brings out the noise, but some extra dark frames, and DSS's extra hot and cold pixel removal tools seem to have done the trick well enough for me.
On this night, Comet Hartley was in the constellation Perseus, shining at about magnitude 5.7. It has a distinct green glow but no distinct tail.