NGC 7317
| NGC 7317 | |
|---|---|
NGC 7317 imaged by the James Webb Space Telescope | |
| Observation data (J2000 epoch) | |
| Constellation | Pegasus |
| Right ascension | 22h 35m 51.8674s |
| Declination | +33° 56′ 41.765″ |
| Redshift | 0.022012 |
| Heliocentric radial velocity | 6599 ± 26 km/s |
| Distance | 301.7 ± 21.2 Mly (92.51 ± 6.51 Mpc) |
| Apparent magnitude (V) | 14.57 |
| Characteristics | |
| Type | E4 |
| Size | ~107,700 ly (33.03 kpc) (estimated) |
| Apparent size (V) | 0.4′ x 0.4′ |
| Other designations | |
| Stephan's Quintet NED01, HCG 92E, HOLM 792D, Arp 319, UGC UGC 12100, MCG +06-49-038, PGC 69256, CGCG 514-060, VV 288d | |
NGC 7317 is an elliptical galaxy that is a member of Stephan's Quintet in the constellation Pegasus. Its velocity with respect to the cosmic microwave background is 6272 ± 35 km/s, which corresponds to a Hubble distance of 301.7 ± 21.2 Mly (92.51 ± 6.51 Mpc). In addition, four non-redshift measurements gives a distance of 294.27 ± 34.22 Mly (90.225 ± 10.491 Mpc). It was discovered on 27 September 1873 by French astronomer Édouard Stephan.
The SIMBAD database lists NGC 7317 as a Seyfert II Galaxy, i.e. it has a quasar-like nucleus with very high surface brightnesses whose spectra reveal strong, high-ionisation emission lines, but unlike quasars, the host galaxy is clearly detectable.
The James Webb Space Telescope photographed it as part of Stephan's Quintet; the image was released on 12 July 2022.