Arp 4
| Galaxy Arp 4 |
|
|---|---|
|
|
| AladinLite | |
| Constellation | whale |
|
Position equinox : J2000.0 , epoch : J2000.0 |
|
| Right ascension | 01 h 48 m 25.7 s |
| declination | -12 ° 22 ′ 55 ″ |
| Appearance | |
| Morphological type | IAB (rs) m |
| Brightness (visual) | 13.7 mag |
| Angular expansion | 2.8 ′ × 2.4 ′ |
| Physical data | |
| Affiliation | LGG 038 |
| Redshift | 0.005384 ± 0.000010 |
| Radial velocity | (1614 ± 3) km / s |
|
Stroke distance v rad / H 0 |
(72 ± 5) x 10 6 ly (22.2 ± 1.6) Mpc |
| history | |
| Catalog names | |
| PGC 006626 • MCG -02-05-050 • KUG 0145-126 • Arp 4 • | |
Arp 4 is an irregular galaxy of Hubble type IAB (rs) m in the constellation Cetus . It is about 72 million light years from the Milky Way . It is accompanied by a spiral galaxy (MCG-02-05-50a).
Halton Arp organized his catalog of unusual galaxies into groups according to purely morphological criteria. This galaxy belongs to the class spiral galaxies with low surface brightness .
Web links
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