NGC 2921
| Galaxy NGC 2921 |
|
|---|---|
|
|
| AladinLite | |
| Constellation | Water snake |
|
Position equinox : J2000.0 , epoch : J2000.0 |
|
| Right ascension | 09 h 34 m 31.6 s |
| declination | -20 ° 55 ′ 13 ″ |
| Appearance | |
| Morphological type | (R ') SAB (rs) a |
| Brightness (visual) | 11.9 likes |
| Brightness (B-band) | 12.9 mag |
| Angular expansion | 2.9 ′ × 1.1 ′ |
| Position angle | 83 ° |
| Surface brightness | 13.0 mag / arcmin² |
| Physical data | |
| Redshift | 0.009877 ± 0.000017 |
| Radial velocity | 2961 ± 5 km / s |
|
Stroke distance v rad / H 0 |
(123 ± 8) · 10 6 ly (37.8 ± 2.6) Mpc |
| history | |
| discovery | William Herschel |
| Discovery date | December 24, 1786 |
| Catalog names | |
| NGC 2921 • PGC 27214 • ESO 565-017 • MCG -03-25-006 • IRAS 09321-2041 • 2MASX J09343160-2055134 • SGC 093213-2041.9 • GC 1875 • H III 597 • h 3173 • GALEX ASC J093431.72- 205514.6 | |
NGC 2921 is a barred spiral galaxy of the Hubble type SBa / P in the constellation Hydra south of the ecliptic . It is estimated to be 123 million light years from the Milky Way and about 115,000 light years in diameter.
In the same area of the sky are u. a. the galaxies NGC 2920 and NGC 2935 .
The object was discovered by Wilhelm Herschel on December 24, 1786 .