NGC 29
| Galaxy NGC 21 / NGC 29 |
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|---|---|
![NGC 29 [1] (SDSS image)](https://de.wikipedia.org/wiki/Datei:NGC29_-_SDSS_DR14.jpg)
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| NGC 29 ( SDSS image) | |
| AladinLite | |
| Constellation | Andromeda |
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Position equinox : J2000.0 , epoch : J2000.0 |
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| Right ascension | 00 h 10 m 46.9 s |
| declination | + 33 ° 21 ′ 10 ″ |
| Appearance | |
| Morphological type | SAB (s) bc: |
| Brightness (visual) | 12.8 mag |
| Brightness (B-band) | 13.6 mag |
| Angular expansion | 1.5 ′ × 0.7 ′ |
| Position angle | 149.8 ° |
| Surface brightness | 12.7 mag / arcmin² |
| Physical data | |
| Affiliation |
NGC 7819 Group NGC 7831 Group LGG 1 |
| Redshift | 0.015911 ± 0.000013 |
| Radial velocity | 4770 ± 4 km / s |
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Stroke distance v rad / H 0 |
(221 ± 15) x 10 6 ly (67.8 ± 4.7) Mpc |
| history | |
| discovery | Wilhelm Herschel Lewis A. Swift |
| Discovery date | November 26, 1790 September 20, 1885 |
| Catalog names | |
| NGC 21 • NGC 29 • UGC 100 • PGC 767 • CGCG 499-066 • MCG + 05-01-048 • IRAS 00082 + 3304 • 2MASX J00104688 + 3321102 • GC 14 • H II 853 • h 6 • NVSS J001047 + 332110 • Swift II • LDCE 4 NED007 | |
NGC 21 = NGC 29 is a bar-spiral galaxy of the Hubble type SBbc in the constellation Andromeda in the northern sky . It is an estimated 221 million light years away from the Milky Way and about 95,000 light years in diameter. The galaxy is considered a member of the NGC 7831 group ( LGG 1 ).
In the same area of the sky are u. a. the galaxies NGC 6 , NGC 13 , NGC 19 , NGC 7836 .
The object was discovered on November 26, 1790 by the German-British astronomer Wilhelm Herschel . About a century later, Lewis A. Swift also observed this galaxy. The double observation was not recognized, however, and so the object received two catalog numbers: NGC 21 (Swift) and NGC 29 (Herschel).