NGC 3642
| Galaxy NGC 3642 |
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|---|---|
![NGC 3642 [1] Image taken with a 24-inch telescope](https://de.wikipedia.org/wiki/Datei:N3642s.jpg)
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| NGC 3642 image taken with a 24-inch telescope | |
| AladinLite | |
| Constellation | Big Bear |
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Position equinox : J2000.0 , epoch : J2000.0 |
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| Right ascension | 11 h 22 m 17.891 s |
| declination | + 59 ° 04 ′ 28.25 ″ |
| Appearance | |
| Morphological type | SA (r) bc: / LINER / Sy3 |
| Brightness (visual) | 10.8 mag |
| Brightness (B-band) | 11.6 mag |
| Angular expansion | 1.8 ′ × 1.5 ′ |
| Position angle | 105 ° |
| Surface brightness | 14.2 mag / arcmin² |
| Physical data | |
| Affiliation | NGC 3642 group LGG 234 |
| Redshift | 0.005297 ± 0.000030 |
| Radial velocity | 1588 ± 9 km / s |
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Stroke distance v rad / H 0 |
(75 ± 5) x 10 6 ly (22.9 ± 1.6) Mpc |
| history | |
| discovery | William Herschel |
| Discovery date | March 18, 1790 |
| Catalog names | |
| NGC 3642 • UGC 6385 • PGC 34889 • CGCG 291-062 • MCG + 10-16-128 • IRAS 11194 + 5920 • 2MASX J11221801 + 5904272 • GC 2387 • H I 245 • h 865 • WISEA J112217.88 + 590428.4 • LDCE 867 NED015 | |
NGC 3642 is a spiral galaxy with an active nucleus of the Hubble-type Sbc in the constellation Great Bear in the northern sky . It is estimated to be 75 million light years from the Milky Way and about 115,000 light years in diameter . She is the brightest member of the NGC 3642 group ( LGG 234 ).
The object was discovered by William Herschel on March 18, 1790 .
NGC 3642 group ( LGG 234 )
| Galaxy | Alternative name | Distance / million Lj |
|---|---|---|
| NGC 3610 | PGC 34566 | 80 |
| NGC 3619 | PGC 34641 | 73 |
| NGC 3642 | PGC 34889 | 75 |
| NGC 3674 | PGC 35191 | 95 |
| NGC 3683 | PGC 35249 | 80 |