Stephan's Quintet is a compact group of galaxies also called Hickson group 92. One galaxy, NGC 7320, the large blue one at the lower left is likely not part of the group, but a foreground galaxy in front of the others.
Details
2016-11-29
20" f/4.1 telescope at the SDG observatory of Garry Sedun in Arizona.
TV Paracorr coma corrector and SBIG ST2000 XM camera.
Guidescope WO 80mm f/6.8 APO.
Mount - Paramount ME
Used 12 R, 13 G, 13 B and 15 L 240 sec subs with dark, flat and bias frames to match.
Processing in Images Plus and Photoshop.