Stephan's Quintet in Pegasus


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Description: This tight collection of interacting galaxies is of of interest to some cosmologists as there appears to be an interaction with NGC7320, the bluish spiral to the right, and the other galaxies.  Since its red shift is nearly a factor of 10 different from the others, such an interaction would challenge the current big bang theory.  The other galaxies are NGC7317 at the top of the grouping, NGC7318A and NGC7318B next to NGC7320, NGC7319 below and at the bottom right, NGC7320C.  The FOV is 14.7 x 9.7 arc-min.  Southwest is up.
Exposure Data: 8/22, 23, 26/2004.  LRGB: 72x5m, 22x5m, 22x5m, 22x5m, RGB 2x2. -20C, 0.42 arc-sec./pixel.
Automatically acquired via CCDAutoPilot and CCDSoft, reduced and aligned in Mira, combined in Sigma, RGB combined in Maxim, L 50 iterations RL deconvolution, LLRGB assembly, curves, levels, other processing in Photoshop.
Optical System: 14.5 Ritchey-Chretien RCOS Truss @ F/9, ST-10XME NABG CCD camera, FLI CFW-2 filter wheel, Paramount ME. AstroDon filters with luminance filter. AO-7 guided and dithered 4 pixels.
Comments: Average seeing was 2.2 arc-sec., deconvolved to 1.5 arc-sec.  11.5 hours total exposure.