NGC 2957
| Galaxy NGC 2957 |
|
|---|---|
|
|
| AladinLite | |
| Constellation | Dragon |
|
Position equinox : J2000.0 , epoch : J2000.0 |
|
| Right ascension | 09 h 47 m 16.9 s |
| declination | + 72 ° 59 ′ 06 ″ |
| Appearance | |
| Morphological type | E1 + E |
| Brightness (visual) | 1: 14.8 mag 2: 14.7 mag |
| Brightness (B-band) | 1: 15.8 mag 2: 15.7 mag |
| Angular expansion | 1: 0.30 '× 0.2' 2: 0.70 '× 0.3' |
| Position angle | 1: 12 ° 42 ° |
| Surface brightness | 1: 11.8 mag / arcmin² 2: 13.1 mag / arcmin² |
| Physical data | |
| Redshift | 0.022352 ± 0.000083 |
| Radial velocity | (6701 ± 25) km / s |
|
Stroke distance v rad / H 0 |
(305 ± 21) · 10 6 ly (93.4 ± 6.5) Mpc |
| history | |
| discovery | John Herschel |
| Discovery date | November 4, 1831 |
| Catalog names | |
| NGC 2957 • PGC 28113/28119 • CGCG 332-064 / 333-002 • MCG + 12-10-065 • Mrk 121 • | |
NGC 2957 is an interacting pair of galaxies, both of the Hubble-type E, in the constellation of Dragon. It is an estimated 302 million light years from the Milky Way .
The object was discovered on November 4, 1831 John Herschel .