IC 4946
| Galaxy IC 4946 |
|
|---|---|
|
|
| AladinLite | |
| Constellation | Sagittarius |
|
Position equinox : J2000.0 , epoch : J2000.0 |
|
| Right ascension | 20 h 23 m 58.1 s |
| declination | -43 ° 59 ′ 43 ″ |
| Appearance | |
| Morphological type | SB (rl) 0 ^ 0 |
| Brightness (visual) | 11.8 mag |
| Brightness (B-band) | 12.6 mag |
| Angular expansion | 2.40 'x 1.0' |
| Position angle | 68 ° |
| Surface brightness | 12.7 mag / arcmin² |
| Physical data | |
| Affiliation | SSRS group 37 NGC 6902-group LGG 434 |
| Redshift | 0.009680 ± 0.000060 |
| Radial velocity | 2902 ± 18 km / s |
|
Stroke distance v rad / H 0 |
(129 ± 9) · 10 6 ly (39.6 ± 2.8) Mpc |
| history | |
| discovery | Lewis Swift |
| Discovery date | September 11, 1897 |
| Catalog names | |
| IC 4946 • ESO 284-015 • ESO 285-007 • MCG -07-42-001 • IRAS 20205-4409 • 2MASX J20235805-4359432 • SGC 202031-4409.5 • GALEX ASC J202358.04-435943.0 • LDCE 1394 NED003 | |
IC 4946 is a lenticular galaxy of the Hubble type SB0 / a in the constellation Sagittarius on the ecliptic . It is estimated to be 129 million light years from the Milky Way and about 95,000 light years in diameter.
Together with NGC 6902 and PGC 64580 ( NGC 6902B ) it forms the small NGC 6902 group or LGG 434 .
The object was discovered by Lewis Swift on September 11, 1897 .