NGC 4643
| Galaxy NGC 4643 |
|
|---|---|
|
|
| SDSS | |
| AladinLite | |
| Constellation | Virgin |
|
Position equinox : J2000.0 , epoch : J2000.0 |
|
| Right ascension | 12 h 43 m 20.1 s |
| declination | + 01 ° 58 ′ 42 ″ |
| Appearance | |
| Morphological type | SB (rs) 0 / a / LINER |
| Brightness (visual) | 10.8 mag |
| Brightness (B-band) | 11.7 mag |
| Angular expansion | 3.1 ′ × 2.5 ′ |
| Position angle | 48 ° |
| Surface brightness | 12.8 mag / arcmin² |
| Physical data | |
| Affiliation | NGC 4643 group NGC 4753 group LGG 315 |
| Redshift | 0.004446 ± 0.000017 |
| Radial velocity | 1333 ± 5 km / s |
|
Stroke distance v rad / H 0 |
(56 ± 4) · 10 6 ly (17.2 ± 1.2) Mpc |
| history | |
| discovery | Wilhelm Herschel |
| Discovery date | January 24, 1784 |
| Catalog names | |
| NGC 4643 • UGC 7895 • PGC 42797 • CGCG 015-008 • MCG + 00-33-005 • IRAS 12407 + 0215 • 2MASX J12432013 + 0158422 • GC 3176 • H I 10 • h 1404 • NSA 172734 • LDCE 904 NED235 • EVCC 2212 | |
NGC 4643 is a lenticular galaxy with an active nucleus of the Hubble type SB0 / a in the constellation Virgo north of the ecliptic . It is estimated to be 56 million light-years from the Milky Way and about 50,000 light-years across.
In the same area of the sky is u. a. the galaxy NGC 4636 .
The object was discovered on January 24, 1784 by Wilhelm Herschel with an 18.7-inch reflector telescope , who described it as "vB pL lE GmbH, 2'long, 1.5 'broad".