Arp 21
| Galaxy Arp 21 |
|
|---|---|
|
|
| SDSS recording | |
| AladinLite | |
| Constellation | Little lion |
|
Position equinox : J2000.0 , epoch : J2000.0 |
|
| Right ascension | 11 h 04 m 58.5 s |
| declination | + 30 ° 01 ′ 38 ″ |
| Appearance | |
| Morphological type | S. |
| Brightness (visual) | 14.7 mag |
| Angular expansion | 1.1 ′ × 0.7 ′ |
| Physical data | |
| Affiliation | Abell 1185 |
| Redshift | 0.028945 ± 0.000096 |
| Radial velocity | (8677 ± 29) km / s |
|
Stroke distance v rad / H 0 |
(386 ± 27) · 10 6 ly (118.5 ± 8.3) Mpc |
| history | |
| Catalog names | |
| PGC 33487 • CGCG 155-056 • MCG + 05-26-047 • IRAS 11021 + 3018 • 2MASX J11045845 + 3001387 • Arp 21 • VV 552b • | |
Arp 21 is a spiral galaxy from the Hubble type S in the constellation Leo Minor . It is around 386 million light years from the Milky Way .
Halton Arp organized his catalog of unusual galaxies into groups according to purely morphological criteria. This galaxy belongs to the class of three-armed spiral galaxies .
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