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Stephan's quintet in Pegasus

September 28, 2017


The famous among astronomers Stephan's quintet in the constellation Pegasus, is another example of a galactic merger. This group has been a case study by the Hubble and some earth-based radio telescopes, as we are trying to identify all the collision forces at play. Four of the five galaxies are physically associated, and dubbed Hickson compact group 92. The fifth galaxy (NGC 7320) depicted in blue, is a foreground projection, estimated at a distance of 39ml ly., vs. the 210-340 ml. ly. of the background galaxies. 


This was imaged remotely in Hocking Hills during July and August, 2016. 

Technical details:


Stephan's quintet in Pegasus

Imaging telescope: AT12 RC astrograph f/8
Imaging camera: QHY9M CCD
Filters: Orion 2'' LRGB, 2''
Mount: AP900 GTO
Guider: Meade DSI Pro II, Robofocus
Software: CCD Commander, Maxim DL, Photoshop CC, Pixinsight 1.8

Date: L: 7/10,8/8,23,24,27, 2016 RGB: 8/26,27, 2016
Seeing: 2.5'' (3-4/5)
Exposure: Ha: 12x1200'' bin1, RGB: 6X600'' each bin2
Total integration 7 hours
Location: Asteria remote observatory, Hocking Hills, Ohio, US


Click image for larger image and prints




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