NGC 7578
| Galaxy NGC 7578 |
|
|---|---|
|
|
| SDSS uptake of HCG 94 | |
| AladinLite | |
| Constellation | Pegasus |
|
Position equinox : J2000.0 , epoch : J2000.0 |
|
| Right ascension | 23 h 17 m 12.7 s |
| declination | + 18 ° 42 ′ 16 ″ |
| Appearance | |
| Morphological type | A: S0 ^ 0 ^ pec B: E1:; BrClG |
| Brightness (visual) | A: 13.9 mag B: 13.9 mag |
| Brightness (B-band) | A: 14.9 mag B: 14.9 mag |
| Angular expansion | A: 0.8 '× 0.8' B: 0.4 '× 0.4' |
| Surface brightness | A: 12 mag / arcmin² B: 13.3 mag / arcmin² |
| Physical data | |
| Redshift | A: 0.040254 ± 0.000107 |
| Radial velocity | B: (12068 ± 32) km / s |
|
Stroke distance v rad / H 0 |
(547 ± 38) · 10 6 ly (167.7 ± 11.7) Mpc |
| history | |
| discovery | Wilhelm Herschel |
| Discovery date | September 18, 1784 |
| Catalog names | |
| NGC 7578 • UGC 12477/8 • PGC 70933/4 • CGCG 454-022 • MCG + 03-59-24 / 25 • Arp 170 • VV 181 • GC 4926 • H III 182 • h 2225 • HCG 94 A / B | |
NGC 7578 = Arp 170 is an interacting galaxy pair , consisting of an elliptical galaxy (NGC 7578B) and a lenticular galaxy (NGC 7578A) in the constellation Pegasus. The galaxy pair is estimated to be 550 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 with diffuse opposing arms .
The object was discovered by Wilhelm Herschel on September 18, 1784 .
Web links
Commons : NGC 7578 - collection of images, videos, and audio files
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