| NGC 7691 | |
|---|---|
| 👁 Image NGC 7691 imaged by SDSS | |
| Observation data (J2000 epoch) | |
| Constellation | Pegasus |
| Right ascension | 23h 32m 24.4185s[1] |
| Declination | +15° 50′ 52.392″[1] |
| Redshift | 0.013479±0.00000300[1] |
| Heliocentric radial velocity | 4,041±1 km/s[1] |
| Distance | 199.44 ± 9.12 Mly (61.150 ± 2.796 Mpc)[1] |
| Group or cluster | NGC 7711 group (LGG 477) |
| Apparent magnitude (V) | 13.9g[1] |
| Characteristics | |
| Type | SAB(rs)bc[1] |
| Size | ~153,200 ly (46.96 kpc) (estimated)[1] |
| Apparent size (V) | 1.67′ × 1.25′[1] |
| Other designations | |
| IRAS 23299+1534, 2MASX J23322441+1550520, UGC 12654, MCG +03-60-001, PGC 71699, CGCG 455-009[1] | |
NGC 7691 is an intermediate spiral galaxy in the constellation of Pegasus. Its velocity with respect to the cosmic microwave background is 3,676±26 km/s, which corresponds to a Hubble distance of 176.8 ± 12.4 Mly (54.21 ± 3.81 Mpc).[1] However, four non-redshift measurements give a farther mean distance of 199.44 ± 9.12 Mly (61.150 ± 2.796 Mpc).[2] It was discovered by German-British astronomer William Herschel on 16 October 1784.[3][4]
NGC 7711 group
[edit]NGC 7691 is part of the NGC 7711 group (also known as LGG 477). This galaxy group contains seven members, including NGC 7711 [fr], NGC 7722, UGC 12633 [d], UGC 12640 [d], UGC 12653 [d], and UGC 12673 [d].[5][6]
Supernova
[edit]One supernova has been observed in NGC 7691:
- SN 2014az (TypeII-P, mag. 16.3) was discovered by Stuart Parker and the Backyard Observatory Supernova Search (BOSS) on 30 April 2014.[7][8]
See also
[edit]References
[edit]- ^ a b c d e f g h i j k "Results for object NGC 7691". NASA/IPAC Extragalactic Database. NASA and Caltech. Retrieved 1 February 2026.
- ^ "Distance Results for NGC 7691". NASA/IPAC EXTRAGALACTIC DATABASE. NASA. Retrieved 1 February 2026.
- ^ Herschel, William (1786). "Catalogue of One Thousand New Nebulae and Clusters of Stars". Philosophical Transactions of the Royal Society of London. 76: 457–499. Bibcode:1786RSPT...76..457H. doi:10.1098/rstl.1786.0027.
- ^ Seligman, Courtney. "New General Catalogue Objects: NGC 7691". Celestial Atlas. Retrieved 1 February 2026.
- ^ Garcia, A. M. (1993). "General study of group membership. II. Determination of nearby groups". Astronomy and Astrophysics Supplement Series. 100: 47. Bibcode:1993A&AS..100...47G.
- ^ "LGG 477". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 1 February 2026.
- ^ Parker, Stuart; Yusa, T.; Shima, K.; Morrell, N.; Hsiao, E.; Phillips, M. (2014). "Supernova 2014az in NGC 7691 = PSN J23322284+1551106". Central Bureau Electronic Telegrams (3872): 1. Bibcode:2014CBET.3872....1P.
- ^ "SN 2014az". Transient Name Server. IAU. Retrieved 1 February 2026.
External links
[edit]- 👁 Wikimedia Commons logo
Media related to NGC 7691 at Wikimedia Commons - NGC 7691 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
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