NGC 3921
| Galaxy NGC 3921 |
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|---|---|
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| Taken using the Hubble Space Telescope | |
| AladinLite | |
| Constellation | Big Bear |
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Position equinox : J2000.0 , epoch : J2000.0 |
|
| Right ascension | 11 h 51 m 06.9 s |
| declination | + 55 ° 04 ′ 43 ″ |
| Appearance | |
| Morphological type | (R ') SA (s) 0 / a pec |
| Brightness (visual) | 12.2 mag |
| Brightness (B-band) | 13.1 mag |
| Angular expansion | 2.1 ′ × 1.3 ′ |
| Position angle | 20 ° |
| Surface brightness | 13.2 mag / arcmin² |
| Physical data | |
| Affiliation | Abell 1377 |
| Redshift | 0.019667 ± 0.000003 |
| Radial velocity | (5896 ± 1) km / s |
|
Stroke distance v rad / H 0 |
(267 ± 19) · 10 6 ly (81.8 ± 5.7) Mpc |
| history | |
| discovery | Wilhelm Herschel |
| Discovery date | April 14, 1789 |
| Catalog names | |
| NGC 3921 • UGC 6823 • PGC 37063 • CGCG 269-007, 268-095 • MCG + 09-20-009 • IRAS 11484 + 5521 • KUG 1148 + 553 • 2MASX J11510686 + 5504433 • Arp 224 • Mrk 430 • VV 31 • GC 2584 • H II 788 • h 997 • LDCE 0846 NED002 | |
NGC 3921 = Arp 224 is a lenticular Galaxy from the Hubble type (R ') SA (s) 0 / a in the constellation Big Bear at the northern sky , an estimated 267 million light-years of the Milky Way is removed.
Halton Arp organized his catalog of unusual galaxies into groups according to purely morphological criteria. This galaxy belongs to the class of galaxies with amorphous spiral arms . The galaxy has two companion galaxies ( SDSS J115113.47 + 550659.3 & SDSS J115059.24 + 550413.6 ).
The object was discovered by William Herschel on April 14, 1789 and is listed in the New General Catalog .
Web links
- astronews.com: Picture of the day September 15, 2015
- Arp Atlas of Peculiar Galaxies
- Seligman Arp
literature
- Jeff Kanipe and Dennis Webb: The Arp Atlas of Peculiar Galaxies - A Chronicle and Observer's Guide , Richmond 2006, ISBN 978-0-943396-76-7