NGC 251
| Galaxy NGC 251 |
|
|---|---|
|
|
| SDSS recording | |
| AladinLite | |
| Constellation | fishes |
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Position equinox : J2000.0 , epoch : J2000.0 |
|
| Right ascension | 00 h 47 m 54.0 s |
| declination | + 19 ° 35 ′ 49 ″ |
| Appearance | |
| Morphological type | Sc |
| Brightness (visual) | 13.4 mag |
| Brightness (B-band) | 14.1 mag |
| Angular expansion | 2.4 ′ × 1.9 ′ |
| Position angle | 96 ° |
| Surface brightness | 14.9 mag / arcmin² |
| Physical data | |
| Redshift | 0.015184 ± 0.000017 |
| Radial velocity | 4552 ± 5 km / s |
|
Stroke distance v rad / H 0 |
(209 ± 15) x 10 6 ly (64.2 ± 4.5) Mpc |
| history | |
| discovery | Wilhelm Herschel |
| Discovery date | October 15, 1784 |
| Catalog names | |
| NGC 251 • UGC 490 • PGC 2806 • CGCG 458-005 • MCG + 03-03-003 • 2MASX J00475403 + 1935485 • GC 135 • H III-204 • h 58 • KCPG 15B | |
NGC 251 is a spiral galaxy of Hubble type Sc in the constellation Pisces on the ecliptic . It is estimated to be 209 million light years from the Milky Way and about 145,000 light years across.
The object was discovered on October 15, 1784 by the German-British astronomer Wilhelm Herschel .
Web links
Commons : NGC 251 - collection of images, videos, and audio files
