NGC 4921
| Galaxy NGC 4921 |
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|---|---|
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| Photo from the Hubble Space Telescope | |
| AladinLite | |
| Constellation | Berenike's hair |
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Position equinox : J2000.0 , epoch : J2000.0 |
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| Right ascension | 13 h 01 m 26.1 s |
| declination | + 27 ° 53 ′ 09 ″ |
| Appearance | |
| Morphological type | SB (rs) from / LINER |
| Brightness (visual) | 12.5 mag |
| Brightness (B-band) | 13.3 mag |
| Angular expansion | R 25 , B-band: 75 ″ , 0 × 60 ″, 0 |
| Position angle |
B-band: 164 ° K-band: 135 ° |
| Surface brightness | 14.1 mag / arcmin² |
| Physical data | |
| Affiliation | Coma cluster |
| Redshift | 0.018286 ± 0.000013 |
| Radial velocity | 5482 ± 4 km / s |
|
Stroke distance v rad / H 0 |
(246 ± 17) · 10 6 ly (75.3 ± 5.3) Mpc |
| Absolute brightness | V-band: (−22.59 ± 0.21) mag |
| history | |
| discovery | William Herschel |
| Discovery date | April 11, 1785 |
| Catalog names | |
| NGC 4921 • UGC 8134 • PGC 44899 • CGCG 160-095 • MCG + 05-31-098 • 2MASX J13012613 + 2753095 • GC 3368 • H II-393 • h 1516 • LDCE 926 NED062 | |
NGC 4921 is a bar-spiral galaxy with an active nucleus of the Hubble type SBab in the constellation Coma Berenices in the northern sky . It is estimated to be 246 million light years from the Milky Way and about 175,000 ly in diameter. It is the brightest galaxy in the Coma cluster of galaxies .
The galaxies NGC 4911 , NGC 4919 , NGC 4923 , IC 4044 are located in the same area of the sky .
The galaxy does not have bright, bright spiral arms , but only a dark dust ring and individual clusters of bright bluish stars. NGC 4921 is relatively structureless, especially in the outer areas.
The supernova SN 1959B was observed here.
The object was discovered by William Herschel at the end of the 18th century , but he did not yet know that it was a distant galaxy.
literature
- Myung Gyoon Lee & In Sung Jang (2016): Globular Clusters and Spur Clusters in NGC 4921, the Brightest Spiral Galaxy in the Coma Cluster ; The Astrophysical Journal 819 (1)
