NGC 6902
| Galaxy NGC 6902 / IC 4948 |
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|---|---|
![NGC 6902 with LEDA 546866 (ro) [1]](https://de.wikipedia.org/wiki/Datei:NGC6902_-_ESO_-_Potw1908a.jpg)
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| NGC 6902 with LEDA 546866 (ro) | |
| AladinLite | |
| Constellation | Sagittarius |
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Position equinox : J2000.0 , epoch : J2000.0 |
|
| Right ascension | 20 h 24 m 28.1 s |
| declination | -43 ° 39 ′ 13 ″ |
| Appearance | |
| Morphological type | SA (r) b / LINER |
| Brightness (visual) | 10.9 likes |
| Brightness (B-band) | 11.8 mag |
| Angular expansion | 5.60 × 3.9 |
| Position angle | 153 ° |
| Surface brightness | 14.1 mag / arcmin² |
| Physical data | |
| Affiliation | SSRS group 37 NGC 6902-group LGG 434 |
| Redshift | 0.009326 ± 0.000013 |
| Radial velocity | 2796 ± 4 km / s |
|
Stroke distance v rad / H 0 |
(125 ± 9) x 10 6 ly (38.2 ± 2.7) Mpc |
| history | |
| discovery | John Herschel |
| Discovery date | September 2, 1836 |
| Catalog names | |
| NGC 6902 • IC 4948 • PGC 64632 • ESO 285-008 • MCG -07-42-002 • IRAS 20210-4348 • 2MASX J20242813-4339127 • SGC 202102-4348.9 • GALEX MSC J202427.84-433915.5 • LDCE 1394 NED004 | |
NGC 6902 = IC 4948 is a bar-spiral galaxy with an active nucleus of the Hubble type SBa in the constellation Sagittarius on the ecliptic . It is estimated to be 125 million light years from the Milky Way and about 210,000 light years in diameter.
Together with IC 4946 and PGC 64580 ( NGC 6902B ) it forms the small NGC 6902 group or LGG 434 .
The object was discovered by John Herschel on September 2, 1836 (listed as an NGC object).
NGC 6902 group ( LGG 434 )
| Galaxy | Alternative name | Distance / million Lj |
|---|---|---|
| NGC 6902 | PGC 64632 | 125 |
| IC 4946 | PGC 64614 | 129 |
| PGC 64580 | NGC 6902B | 132 |