Hoag's object
| Galaxy data from Hoag's object |
|
|---|---|
|
|
| Hoags object ( HST recording) | |
| AladinLite | |
| Constellation | Snake |
|
Position equinox : J2000.0 , epoch : J2000.0 |
|
| Right ascension | 15 h 17 m 14.4 s |
| declination | + 21 ° 35 ′ 08 ″ |
| Appearance | |
| Brightness (visual) | 16.4 mag |
| Angular expansion | 0.28 ′ × 0.28 ′ |
| Physical data | |
| Redshift | 42,483 · 10 −6 |
| Radial velocity | 12813 ± 3 km / s |
| distance | 540 · 10 6 years |
| Absolute brightness | −20.3 mag |
| diameter | 40,000 ly |
| history | |
| discovery | Art Hoag |
| Discovery date | 1950 |
| Catalog names | |
| PGC 54559 • PRC D-51 | |
Hoag's object is an atypical galaxy of the ring galaxy type . The appearance of this object has interested not only amateur astronomers, but also professional astronomers because of its unusual structure . The object was discovered in 1950 by astronomer Art Hoag , who viewed it as a planetary nebula .
An almost perfect circle of young blue hot stars surrounds the older yellow core of this ring galaxy, which is about 540 million light years away in the constellation of Snake .