| NGC 7769 | |
|---|---|
 The spiral galaxy NGC 7769 | |
| Observation data (J2000epoch) | |
| Constellation | Pegasus |
| Right ascension | 23h 51m 03.9592s[1] |
| Declination | +20° 09′ 01.508″[1] |
| Redshift | 0.014046[1] |
| Heliocentric radial velocity | 4211 ± 2 km/s[1] |
| Distance | 185.4 ± 13.0 Mly (56.85 ± 4.00 Mpc)[1] |
| Group orcluster | NGC 7771 Group (LGG 483) |
| 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′ × 2.7′[1] |
| Other designations | |
| HOLM 820C,IRAS 23485+1952,2MASX J23510396+2009014,UGC 12808,MCG +03-60-030,Mrk 9005,PGC 72615,CGCG 455-054[1] | |
NGC 7769 is an unbarredspiral galaxy in theconstellation ofPegasus. Its velocity with respect to thecosmic microwave background is 3855 ± 25 km/s, which corresponds to aHubble distance of 56.85 ± 4Mpc (~185 millionlight-years).[1] It was discovered by German-British astronomerWilliam Herschel on 18 September 1784.[2]
The galaxies NGC 7769, together withNGC 7770 andNGC 7771, are listed together asHolm 820 inErik Holmberg'sA Study of Double and Multiple Galaxies Together with Inquiries into some General Metagalactic Problems, published in 1937.[3] NGC 7769 also is listed as part of the five-member NGC 7771 Group (also known asLGG 483), which contains the 3 galaxies from Holm 820,NGC 7786, and UGC 12828.[4]
NGC 7769 is aLINER 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]
Threesupernovae have been observed in NGC 7769:
Media related toNGC 7769 at Wikimedia Commons
