This diffused emission nebula is about 5,500 light years away in Cassiopeia. This is about half of the nebula, if I had the other half, you would know why this is sometimes known as the Pac Man nebula.
Camera: SBIG ST-10XME
Filters: Astrodon LRGB
Dates: October 12-22, 2006
Exposure: LRGB: L=55x6min, RGB=19x5min each for 10.25 hours total at -20C