NGC 7769 is a spiral galaxy in the constellation of Pegasus. Its velocity with respect to the cosmic microwave background is 3855 ± 25 km/s, which corresponds to a Hubble distance of 56.85 ± 4.00 Mpc (∼185 million light-years).[1] It was discovered by German-British astronomer William Herschel on 18 September 1784.[2]
| NGC 7769 | |
|---|---|
 The spiral galaxy NGC 7769. | |
| Observation data (J2000 epoch) | |
| Constellation | Pegasus |
| Right ascension | 23h 51m 03.97s[1] |
| Declination | +20° 09′ 01.5″[1] |
| Redshift | 0.014046[1] |
| Heliocentric radial velocity | 6580 ± 10 km/s[1] |
| Distance | 185.4 ± 13.0 Mly (56.85 ± 4.00 Mpc)[1] |
| Apparent magnitude (V) | 12.0[1] |
| Characteristics | |
| Type | (R)SA(rs)b[1] |
| Size | ~176,600 ly (54.14 kpc) (estimated)[1] |
| Apparent size (V) | 3.2' x 2.7'[1] |
| Other designations | |
| IRAS 23485+1952, 2MASX J23510396+2009014, UGC 12808, MCG +03-60-030, PGC 72615, CGCG 455-054[1] | |
NGC 7769, together with NGC 7770 and NGC 7771, forms the galaxy trio Holm 820.[3] It also is listed as part of the five-member group LGG 483, also known as the NGC 7771 Group, which contains the 3 galaxies from Holm 820, NGC 7786, and UGC 12828.[4]
NGC 7769 is a LINER galaxy, i.e. it has a type of nucleus that is defined by its spectral line emission which has weakly ionized or neutral atoms, while the spectral line emission from strongly ionized atoms is relatively weak.[1]
Two supernovae have been observed in NGC 7769: SN 2019iex (type II, mag. 17.6)[5] and SN 2024grb (type II, mag. 18.2).[6]
See also
editReferences
edit- ^ a b c d e f g h i j k l "NASA/IPAC Extragalactic Database". Results for NGC 7769. Retrieved 2 August 2024.
- ^ Celestial Atlas entry for NGC 7769. Retrieved 2 August 2024.
- ^ The Webb Deep-Sky Society entry for NGC 7771 Trio in Pegasus. Retrieved 2 August 2024.
- ^ 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.
- ^ Transient Name Server entry for SN 2019iex. Retrieved 2 August 2024.
- ^ Transient Name Server entry for SN 2024grb. Retrieved 2 August 2024.
External links
edit
Media related to NGC 7769 at Wikimedia Commons- NGC 7769 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
