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 Stephan's Quintet 


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About:
The first identified compact galaxy group, Stephan's Quintet is featured in this image. The galaxies of the quintet are gathered near the center of the field, but really only four of the five are locked in a cosmic dance of repeated close encounters taking place some 300 million light-years away. The odd man out is easy to spot, though. The interacting galaxies, NGC 7319, 7318A, 7318B, and 7317 have a more dominant yellowish cast. They also tend to have distorted loops and tails, grown under the influence of disruptive gravitational tides. The mostly bluish galaxy, NGC 7320, is in the foreground about 40 million light-years distant, and isn't part of the interacting group. Still, captured in this field above and to the right of Stephan's Quintet is another galaxy, NGC 7320C, that is also 300 million light-years distant. Of course, including it would bring the four interacting galaxies back up to quintet status. Stephan's Quintet lies within the boundaries of the high flying constellation Pegasus. [Text from APOD]



Pubblications "Flickr" Explore - November 3rd, 2014
Optics: GSO RC 10" F8 2000mm - Astrograph Ritchie-Chrétien
Mount: AP Mach1 GTO on Gemini Q-Lock tripod
Camera: QSI-640WSG
Filters: Astrodon LRGB 1.25" I Series Gen II
Guiding Systems: SXV-AO-LF Active Optics - SX Lodestar
Dates/Times: 25-26-27 September 2014 / 17-25-28-29-30 October 2014
Location: Pragelato - Turin - (Italy)
Exposure Details: L:R:G:B => 900:110:120:130 = > (60x15):(11x10):(12x10):(13x10) color Bin2 [num x minutes]
Cooling Details: -25°C
Acquisition: Maxim DL/CCD, TheSkyX, Voyager
Processing: CCDStack2+, PS CS5
Mean FWHM: 1.68" / 2.78"
SQM-L: 20.45 / 21.13