NGC 6657
| Galaxy NGC 6657 |
|
|---|---|
|
|
| AladinLite | |
| Constellation | lyre |
|
Position equinox : J2000.0 , epoch : J2000.0 |
|
| Right ascension | 18 h 33 m 01.4 s |
| declination | + 34 ° 03 ′ 38 ″ |
| Appearance | |
| Morphological type | SB |
| Brightness (visual) | 13.7 mag |
| Brightness (B-band) | 14.4 mag |
| Angular expansion | 1 ′ × 0.6 ′ |
| Position angle | 138 ° |
| Surface brightness | 13.0 mag / arcmin² |
| Physical data | |
| Redshift | 0.023463 ± 0.000100 |
| Radial velocity | 7034 ± 30 km / s |
|
Stroke distance v rad / H 0 |
(323 ± 23) x 10 6 ly (99.1 ± 7.0) Mpc |
| history | |
| discovery | Édouard Stephan |
| Discovery date | July 16, 1876 |
| Catalog names | |
| NGC 6657 • UGC 11271 • PGC 62019 • CGCG 201-008 • MCG + 06-41-003 • IRAS 18312 + 3401 • 2MASX J18330147 + 3403376 • GC 5917 • | |
NGC 6657 is the name of a bar-spiral galaxy of the Hubble type SBc in the constellation Lyra in the northern sky. It is an estimated 323 million light years away from the Milky Way and about 95,000 light years in diameter. It has an apparent magnitude of 13.7 mag and an apparent size of 0.8 '× 0.4'.
The object was discovered on July 16, 1876 by the French astronomer Édouard Jean-Marie Stephan .