NGC 257
| Galaxy NGC 257 |
|
|---|---|
|
|
| SDSS recording | |
| AladinLite | |
| Constellation | fishes |
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Position equinox : J2000.0 , epoch : J2000.0 |
|
| Right ascension | 00 h 48 m 01.5 s |
| declination | + 08 ° 17 ′ 49 ″ |
| Appearance | |
| Morphological type | Scd: |
| Brightness (visual) | 12.7 mag |
| Brightness (B-band) | 13.4 mag |
| Angular expansion | 1.9 ′ × 1.3 ′ |
| Position angle | 105 ° |
| Surface brightness | 13.5 mag / arcmin² |
| Physical data | |
| Redshift | 0.017592 ± 0.000007 |
| Radial velocity | 5274 ± 2 km / s |
|
Stroke distance v rad / H 0 |
(240 ± 17) x 10 6 ly (73.7 ± 5.2) Mpc |
| history | |
| discovery | Wilhelm Herschel |
| Discovery date | December 29, 1790 |
| Catalog names | |
| NGC 257 • UGC 493 • PGC 2818 • CGCG 410-006 • MCG + 01-03-003 • IRAS 00454 + 0801 • 2MASX J00480150 + 0817494 • GC 143 • H II-863 • GALEX ASC J004801.56 + 081751.2 • LDCE 46 NED002 | |
NGC 257 is a spiral galaxy from the Hubble type Sc in the constellation fish on the ecliptic . It is estimated to be 240 million light years from the Milky Way and about 135,000 light years in diameter.
The galaxy NGC 250 is located in the same area of the sky .
The object was discovered on December 29, 1790 by the German-British astronomer Wilhelm Herschel .