File:NGC_7317_photograph_by_James_Webb_Space_Telescope_-_12_July_2022.png · Wikimedia Commons · See Wikimedia Commons
Q660849
Sign in to savegalaxy in the constellation Pegasus
Key facts
- Constellation
- Pegasus
- Right ascension
- 22 35 51.8674
- Declination
- +33 ° 56 ′ 41.765 ″
- Heliocentric radial velocity
- 6599 ± 26 km/s
- Distance
- 301.7 ± 21.2 Mly (92.51 ± 6.51 Mpc )
- Type
- E4
- Size
- ~107,700 ly (33.03 kpc ) (estimated)
- Apparent size v
- 0.4′ x 0.4′
via Wikipedia infobox
~1 min read
Encyclopedic overview
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 give 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.
Excerpted from Wikipedia’s “Q660849” article, available under the CC BY-SA 4.0 licence.
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