Introduction | Map | My Own Photos | My Own Observations | References
On this page I collect my observations of the galaxy NGC 7317 and Stephan's Quintet (also called Hickson 92 / HGC 92 or Arp 391) in the constellation Pegasus.
NGC 7317 is an elliptical galaxy in the constellation Pegasus, which is about 300 million light years away from the Milky Way. NGC 7317 is a member of the Stephan's Quintet galaxy group (also called Hickson 92 / HGC 92 or Arp 391). This is a group of five galaxies in the constellation Pegasus, which was discovered on September 22, 1877 by the French astronomer Édouard Jean-Marie Stephan. The galaxy group consists of the galaxies NGC 7317, NGC 7318A, NGC 7318B, NGC 7319 and NGC 7320C (see below).
The galaxies NGC 7317 to NGC 7319 form a spatially close, interacting system at a distance of around 300 million light years. Due to the mutual gravitational effect, the spiral arms of the galaxies are irregularly deformed.
NGC 7320 was originally counted as part of Stephan's quintet by its namesake, but this galaxy is a foreground galaxy at a distance of around 45 million light years, which only coincides with Stephan's quintet by projection. Instead, NGC 7320C is now added to the quintet (it is 5' apart and somewhat outside of the group...), so that there are still five galaxies.
In the eVscope all the galaxies are very small and in the Vespera even more so. The group is located close (about 30') to the galaxy NGC 7331.
| NGC 7317 | NGC 7318A | 7318B | ||
| Size: 0.4' x 0.4' (Wikipedia) Distance: 304 millions light years (Wikipedia) Rating: --- |
Size: 1.2' x 1' (Wikipedia) |
Size: 1.6' x 1.1' (Wikipedia) Distance: 267 millions light years (Wikipedia) Rating: --- |
||
| NGC 7319 | NGC 7320C | NGC 7331 | ||
| Size: 1.4' x 1.1' (Wikipedia) Distance: 311 millions light years (Wikipedia) Rating: --- |
Size: 0.6' x 0.4' (Wikipedia) Distance: 277 millions light years (Wikipedia) Rating: --- |
Size: 4' x 1.5' / 10.5′ × 3.7' (Stoyan/Wikipedia) Distance: 46 millions light years (Wikipedia) Rating: * (Stoyan) |
||
| NGC 7320 | ||||
| Size: 2.2' x 1.1' (Wikipedia) Distance: 45 millions light years (Wikipedia) Rating: --- |
The spiral galaxy NGC 7317 in the constellation Pegasus is part of Stephan's Quintet and close to the galaxy NGC 7331 (Image Courtesy of SkySafari Astronomy, www.simulationcurriculum.com)
Stephan's Quintet (right) is close to the galaxy NGC 7331 (left); NGC 7320C is indicated (Image Courtesy of SkySafari Astronomy, www.simulationcurriculum.com)
 |
 |
 |
||
NGC 7317 - Aug 23, 2020 |
NGC 7317 - Aug 24, 2020 |
NGC 7317 - Oct 9, 2021, somewhat fuzzy |
||
 |
 |
 |
||
NGC 7317 - Aug 23, 2020, processed |
NGC 7317 - Aug 24, 2020, processed |
NGC 7317 - Oct 9, 2021, processed |
||
 |
||||
| Evaluation with nova.astrometry.net |
 |
|
 |
||
NGC 7317 - Dec 10, 2021 |
NGC 7317 - Dec 10, 2021, processed |
Evaluation with nova.astrometry.net |
 |
 |
|
NGC 7317/SQ & NGC 7331, Aug 25, 2022 - original (90 frames = 900 seconds) |
Evaluation with nova.strometry.net |
Galaxies close to NGC 7331: IC 1450, NGC 7325, NGC 7326, NGC 7327, NGC 7333 (double star), NGC 7335, NGC 7336, NGC 7337, NGC 7338 (double star), NGC 7340
