NGC 4102
| Galaxy NGC 4102 |
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|---|---|
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| Photo from the Hubble Space Telescope | |
| AladinLite | |
| Constellation | Big Bear |
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Position equinox : J2000.0 , epoch : J2000.0 |
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| Right ascension | 12 h 06 m 23.0 s |
| declination | + 52 ° 42 ′ 40 ″ |
| Appearance | |
| Morphological type | SAB (s) b? / HII / LINER |
| Brightness (visual) | 11.3 mag |
| Brightness (B-band) | 12.1 mag |
| Angular expansion | 3.1 ′ × 1.7 ′ |
| Position angle | 38 ° |
| Surface brightness | 13.0 mag / arcmin² |
| Physical data | |
| Affiliation | LGG 258 |
| Redshift | 0.002823 +/- 0.000007 |
| Radial velocity | 846 +/- 2 km / s |
|
Stroke distance v rad / H 0 |
(41 ± 3) · 10 6 ly (12.6 ± 0.9) Mpc |
| history | |
| discovery | William Herschel |
| Discovery date | April 12, 1789 |
| Catalog names | |
| NGC 4102 • UGC 7096 • PGC 38392 • CGCG 269-036 • MCG + 09-20-94 • IRAS 12038 + 5259 • 2MASX J12062311 + 5242394 • GC 2717 • H I 225 • h 1085 • LDCE 0867 NED073 | |
NGC 4102 is a bar-spiral galaxy with extensive HII regions of the Hubble-type SAB (s) b? in the constellation Great Bear in the northern sky , which is an estimated 41 million light years from the Milky Way .
The galaxy is classified as a LINER galaxy in astronomy . LINER stands for "low-ionization nuclear emission-line region" and indicates that radiation from its center can be observed which is due to weakly ionized or neutral atoms of certain elements. Most of these galaxies show a high rate of star formation , as can also be seen in the image as bright blue areas.
The object was discovered in 1789 by the astronomer William Herschel using an 18.7 inch telescope.