NGC 6257
| Galaxy NGC 6257 |
|
|---|---|
|
|
| SDSS recording | |
| AladinLite | |
| Constellation | Hercules |
|
Position equinox : J2000.0 , epoch : J2000.0 |
|
| Right ascension | 16 h 56 m 03.5 s |
| declination | + 39 ° 38 ′ 44 ″ |
| Appearance | |
| Morphological type | Sc (f) |
| Brightness (visual) | 14.8 mag |
| Brightness (B-band) | 15.6 mag |
| Angular expansion | 0.8 ′ × 0.2 ′ |
| Position angle | 123 ° |
| Surface brightness | 12.7 mag / arcmin² |
| Physical data | |
| Redshift | 0.015651 +/- 0.000057 |
| Radial velocity | 4692 +/- 17 km / s |
|
Stroke distance v rad / H 0 |
(217 ± 15) · 10 6 ly (66.6 ± 4.7) Mpc |
| history | |
| discovery | John Herschel |
| Discovery date | May 16, 1831 |
| Catalog names | |
| NGC 6257 • PGC 59274 • CGCG 225-012 • IRAS F16543 + 3942 • 2MASX J16560347 + 3938442 • GC 4259 • h 1974 • | |
NGC 6257 is a 14.4 mag bright spiral-shaped Low Surface Brightness Galaxy of the Hubble-type Sc in the constellation Hercules . It is estimated to be 217 million light years from the Milky Way and about 50,000 light years in diameter.
The object was discovered by John Herschel on May 16, 1831 .
Web links
- NGC 6257. SIMBAD, accessed July 13, 2016 .
- NGC 6257. DSO Browser, accessed July 13, 2016 .
- Auke Slotegraaf: NGC 6257. Deep Sky Observer's Companion, accessed on July 13, 2016 .