The bright galaxy NGC 7331 in Pegasus, accompanied by several small, faint companion galaxies to the left of 7331, while southwest (lower right) of 7331 is the group of galaxies called Stephan’s Quintet, though only 3 are immediately obvious here. This is the group, numbered NGC 7317-18-19-20, with one anomalous member with a different redshift than the others, but which is not physically associated with the group. This is a stack of 5 x 8 minute exposures with the Quattro 20cm astrographic Newtonian reflector at f/4 with its coma corrector, and with the Canon 5D MkII at ISO 800.
NGC 7331 and Stephen's Quintet below, with 5-inch Astro-Physics apo refractor at f/6 with Canon 20Da camera at ISO 800 for stack of 4 x 8 minute exposures, at ambient temp of about +4° C. Taken Oct. 7, 2007. No field flattener on scope -- however, even the 20Da needs it. Taken as part of A-B comparison with ST402 shots of same.
