NGC 4643
Galaxy NGC 4643 |
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SDSS | |
AladinLite | |
Constellation | Virgin |
Position equinox : J2000.0 , epoch : J2000.0 |
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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".