IC 579
| Galaxy IC 579 |
|
|---|---|
|
|
| AladinLite | |
| Constellation | Water snake |
|
Position equinox : J2000.0 , epoch : J2000.0 |
|
| Right ascension | 09 h 56 m 39.4 s |
| declination | -13 ° 46 ′ 30 ″ |
| Appearance | |
| Morphological type | SB (rs) from: / HII |
| Brightness (visual) | 13.9 likes |
| Brightness (B-band) | 14.7 mag |
| Angular expansion | 1.3 ′ × 0.4 ′ |
| Position angle | 141 ° |
| Surface brightness | 13.0 mag / arcmin² |
| Physical data | |
| Redshift | 0.031649 ± 0.000127 |
| Radial velocity | (9488 ± 38) km / s |
|
Stroke distance v rad / H 0 |
(416 ± 29) x 10 6 ly (127.4 ± 8.9) Mpc |
| history | |
| discovery | Lewis Swift |
| Discovery date | March 25, 1889 |
| Catalog names | |
| IC 579 • PGC 28702 • MCG -02-26-005 • IRAS 09542-1332 • 2MASX J09563939-1346295 • LDCE 0687 NED005 | |
IC 579 is a bar-spiral galaxy of the Hubble type Sab in the constellation Hydra south of the celestial equator . It is an estimated 416 million light years from the Milky Way .
The object was discovered by Lewis A. Swift on March 25, 1889 . However, there isn't a very good reason to believe that PGC 28702 is IC 579, but it is listed as such in a number of databases (albeit with the occasional warning that the identification is very uncertain). The identification is believed to be based on the galaxy being roughly the same right ascension as Swift's measurement and being the brightest object at a reasonable distance from its position. For the most part, however, Swift's declinations were far more accurate than his right ascension, and when his declinations were wrong they were usually offset by a simple multiple of one or ten arc minutes, or whole or half degrees (errors that could be easily fixed by adding You misread the setting circles on his telescope).