NGC 5278/79
| Galaxy Arp 239 |
|
|---|---|
 |
|
| HST recording; NGC 5278 right, NGC 5279 left | |
| AladinLite | |
| Constellation | Big Bear |
|
Position equinox : J2000.0 , epoch : J2000.0 |
|
| Right ascension | 13 h 41 m 41.6 s |
| declination | + 55 ° 40 ′ 20 ″ |
| Appearance | |
| Morphological type | SA (s) b? pec (NGC 5278) SB (s) a pec (NGC 5279) |
| Brightness (visual) | 12.9 (NGC 5278) mag 14.0 (NGC 5279) mag |
| Brightness (B-band) | 13.7 (NGC 5278) mag 15.0 (NGC 5279) mag |
| Angular expansion | 1.3 × 1.0 (NGC 5278) 0.7 × 0.4 (NGC 5279) |
| Position angle | 57 ° (NGC 5278) 29 ° (NGC 5279) |
| Surface brightness | 13.0 (NGC 5278) mag / arcmin² 12.5 (NGC 5279) mag / arcmin² |
| Physical data | |
| Redshift | 0.025154 ± 0.000097 0.025284 ± 0.000110 |
| Radial velocity | (7541 ± 29) km / s (7580 ± 33) km / s |
|
Stroke distance v rad / H 0 |
(342 ± 24) x 10 6 ly (104.9 ± 7.4) Mpc |
| history | |
| discovery |
William Herschel (NGC 5278) John Herschel (NGC 5279) |
| Discovery date | April 14, 1789 May 4, 1831 |
| Catalog names | |
| NGC 5278/9 • UGC 8677/8 • PGC 48473/82 • CGCG 271-058 • MCG + 09-22-101 / 2 • Arp 239 • Mrk 271 • VV 19 • GC 3639 • H II 798 • h 1665 • KPG 390 | |
NGC 5278/79 = Arp 239 is an interacting galaxy pair in the constellation Ursa Major with a morphology comparable to M51 . It is around 342 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 galaxies showing signs of splitting .
The object was discovered by William Herschel on April 14, 1789 . On May 4, 1831, John Herschel observed this object cataloged by his father again and found that it was a "double nebula". Dreyer noted the first, slightly lighter object in his New General Catalog as NGC 5278 , the second as NGC 5279 .
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