NGC 4157
| Galaxy NGC 4157 |
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| Image of the galaxy NGC 4157 with the help of the 81 cm mirror telescope of the Mount Lemmon Observatory with a total exposure time of around 11 hours. North is diagonally down to the right. | |
| AladinLite | |
| Constellation | Big Bear |
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Position equinox : J2000.0 , epoch : J2000.0 |
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| Right ascension | 12 h 11 m 04.4 s |
| declination | + 50 ° 29 ′ 05 ″ |
| Appearance | |
| Morphological type | SAB (s) b? / HII |
| Brightness (visual) | 11.4 mag |
| Brightness (B-band) | 12.2 mag |
| Angular expansion | 6.7 ′ × 1.2 ′ |
| Position angle | 66 ° |
| Surface brightness | 13.6 mag / arcmin² |
| Physical data | |
| Affiliation | UMa cluster NGC 3992 group LGG 258 |
| Redshift | 0.002583 ± 0.000006 |
| Radial velocity | 774 ± 2 km / s |
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Stroke distance v rad / H 0 |
(38 ± 3) x 10 6 ly (11.5 ± 0.8) Mpc |
| history | |
| discovery | William Herschel |
| Discovery date | March 9, 1788 |
| Catalog names | |
| NGC 4157 • UGC 7183 • PGC 38795 • CGCG 269-38 • MCG + 09-20-106 • IRAS 12085 + 5045 • 2MASX J12110436 + 5029048 • GC 2761 • H I 208 • h 1114 • NSA 140872 • LDCE 867 NED086 | |
NGC 4157 is a bar-spiral galaxy with extensive star formation regions of the Hubble type SBb in the constellation Great Bear in the northern sky . It is estimated to be 38 million light years from the Milky Way and about 70,000 ly in diameter. The galaxy is part of the Ursa Major Galaxy Cluster .
In the same area of the sky is u. a. the galaxy NGC 4187 .
Ultraviolet absorption by GALEX
The type IIP supernovae SN 1937A , SN 1955A and SN 2003J were observed here.
The object was discovered on March 9, 1788 by William Herschel .
Web links
Commons : NGC 4157 - collection of images, videos, and audio files
