NGC 7317

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).^[1] In addition, four non-redshift measurements give a distance of 294.27 ± 34.22 Mly (90.225 ± 10.491 Mpc).^[2] It was discovered on 27 September 1873 by French astronomer Édouard Stephan.^[3]

NGC 7317
NGC 7317 imaged by the James Webb Space Telescope
Observation data (J2000 epoch)
Constellation	Pegasus
Right ascension	22h 35m 51.8674s[1]
Declination	+33° 56′ 41.765″[1]
Redshift	0.022012[1]
Heliocentric radial velocity	6599 ± 26 km/s[1]
Distance	301.7 ± 21.2 Mly (92.51 ± 6.51 Mpc)[1]
Apparent magnitude (V)	14.57[1]
Characteristics
Type	E4[1]
Size	~107,700 ly (33.03 kpc) (estimated)[1]
Apparent size (V)	0.4′ x 0.4′[1]
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[1]

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.^[4]

The James Webb Space Telescope photographed it as part of Stephan's Quintet; the image was released on 12 July 2022.

See also

• List of NGC objects (7001–7840)