NGC 4955
| Galaxy NGC 4955 |
|
|---|---|
|
|
| AladinLite | |
| Constellation | Water snake |
|
Position equinox : J2000.0 , epoch : J2000.0 |
|
| Right ascension | 13 h 06 m 04.8 s |
| declination | -29 ° 45 ′ 15 ″ |
| Appearance | |
| Morphological type | E2 |
| Brightness (visual) | 12.1 mag |
| Brightness (B-band) | 13.1 mag |
| Angular expansion | 1.9 ′ × 1.3 ′ |
| Position angle | 23 ° |
| Surface brightness | 13.2 mag / arcmin² |
| Physical data | |
| Affiliation | LGG 328 |
| Redshift | 0.011548 +/- 0.000033 |
| Radial velocity | 3462 +/- 10 km / s |
|
Stroke distance v rad / H 0 |
(148 ± 10) · 10 6 ly (45.4 ± 3.2) Mpc |
| history | |
| discovery | John Herschel |
| Discovery date | March 30, 1835 |
| Catalog names | |
| NGC 4955 • PGC 45340 • ESO 443-G062 • MCG -05-31-034 • 2MASX J13060479-2945155 • SGC 130321-2929.2 • GC 3394 • h 3464 • LDCE 0924 NED036 | |
NGC 4955 is a 12.1 mag bright elliptical galaxy of the Hubble-type E2 in the constellation Hydra south of the celestial equator . It is estimated to be 148 million light years from the Milky Way and about 90,000 ly in diameter.
The object was discovered on March 30, 1835 by John Herschel with an 18-inch reflecting telescope, who described it as "F, R, gbM, 35 arcseconds".