Arp 99, Hickson 93 (NGC 7547, 7549, 7550, 7553, and NGC 7558). The first four galaxies form a cluster of interacting galaxies about 230 million light years distance. The large elliptical 7550 with an extended shell of stars may be interacting with the smaller 7547. The distorted spiral galaxy 7549 has active star forming clusters. The spiral galaxy below 7550, NGC 7558, at about 400 MLY is not part of this group.

Lum: 9 hours, 22 x 25 min; RGB: 6 x 20 min each, bin 2 x 2
14.5 inch RCOS f/8 with PIR on Paramount ME
SBIG 11000M and AO-L and Custom Scientific filters
Image acquisition: CCDSoft, TheSky6, Focusmax
Processing: CCDStack2, Photoshop CS3, Maxim DL5, eXcalibrator, Deep Sky Colors, Noise Ninja,Gradient Exterminator