| Name: | NGC7317-7320 |
| Other names: | Stephan's Quintet (Sextet with ngc 7320) |
| Description: | Compact Galaxy Group |
| Ascension: | 22 : 36.1 |
| Declanation: | +33 : 57 |
| Apparent diameter: | 2.2 (arc min) for ngc 7320 |
| Constellation: | Pegasus |
| Magnitude: | 13 |
| Distance: | 345 million light years!! (MY RECORD) |
| Equipment: | Meade ETX90+sc3 icx424 camera f-0.6 |
| Date / Time UTC: | 13 october 2004 00:30 |
| Stacked : | 142 of 636 ! |
| Exposure time: | 20 s |
| Location: | The Hague, The Netherlands |
| Other info: | In 1877, the French astronomer E. M. Stephan, observing visually with the 40cm refracting telescope of the Observatory of Marseilles, discovered a small, dense group of galaxies. This remarkable system, now known as Stephan's Quintet (aka Hickson 92, Arp 319, & VV 228), consists of five galaxies which appear so close together that their images overlap. Many of the galaxies are extraordinary in themselves, showing signs of violent interaction, including highly distorted shapes, and long filaments of stars and gas extending far from the body of the galaxy. This system is the prototype of a class of small clusters of galaxies commonly known as "compact groups of galaxies".
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© Job Gehéniau
http://www.jgeheniau.nl/etx90/astronomy2.html