NGC 21
Galaxy in the constellation Andromeda
From Wikipedia, the free encyclopedia
NGC 21 (also known as NGC 29) is a spiral galaxy in the Andromeda constellation. It was discovered by German-British astronomer William Herschel on 26 November 1790. Lewis Swift observed it again in 1885, leading to its double listing in the New General Catalogue.
| NGC 21 | |
|---|---|
NGC 21/NGC 29 (Sloan Digital Sky Survey) | |
| Observation data (J 2000.0 epoch) | |
| Constellation | Andromeda |
| Right ascension | 00h 10m 46.9s[1] |
| Declination | +33° 21′ 10″[1] |
| Redshift | 0.015911[1] |
| Heliocentric radial velocity | 4,770 ± 4 km/s[1] |
| Distance | 234 ± 29 Mly (71.7 ± 8.9 Mpc)[2] |
| Apparent magnitude (V) | +12.8 |
| Absolute magnitude (V) | -20.75[3] |
| Characteristics | |
| Type | SAB(s)bc |
| Apparent size (V) | 1.2′ × 0.59′ |
| Other designations | |
| IRAS 00082+3304, NGC 29, UGC 100, MCG +05-01-048, PGC 767, CGCG 499-066[1] | |
