NGC 4642
| Galaxy NGC 4642 |
|
|---|---|
|
|
| SDSS | |
| AladinLite | |
| Constellation | Virgin |
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Position equinox : J2000.0 , epoch : J2000.0 |
|
| Right ascension | 12 h 43 m 17.8 s |
| declination | -00 ° 38 ′ 39 ″ |
| Appearance | |
| Morphological type | SAB (rs) bc / pec / sp |
| Brightness (visual) | 13.0 likes |
| Brightness (B-band) | 13.8 mag |
| Angular expansion | 1.9 x 0.5 |
| Position angle | 37 ° |
| Surface brightness | 12.8 mag / arcmin² |
| Physical data | |
| Redshift | 0.008819 ± 0.000020 |
| Radial velocity | (2644 ± 6) km / s |
|
Stroke distance v rad / H 0 |
(114 ± 8) x 10 6 ly (35.0 ± 2.5) Mpc |
| history | |
| discovery | Wilhelm Herschel |
| Discovery date | January 1, 1786 |
| Catalog names | |
| NGC 4642 • UGC 7893 • PGC 42791 • CGCG 015-007 • MCG + 00-33-004 • IRAS 12407-0022 • 2MASX J12431778-0038392 • GC 3175 • H III 494 • GALEXASC J124317.81-003840.5 • LDCE 913 NED001 • EVCC 1092 | |
NGC 4642 is a barred spiral galaxy of the Hubble type SBbc in the constellation Virgo on the ecliptic . It is estimated to be 114 million light years from the Milky Way and about 70,000 light years in diameter.
In the same area of the sky are the galaxies NGC 4632 , NGC 4653 , NGC 4666 , NGC 4668 .
The object was discovered on January 1, 1786 by Wilhelm Herschel with an 18.7-inch reflector telescope, who described it as "vF, pS, E".