NGC 639
| Galaxy NGC 639 |
|
|---|---|
![NGC 639 [1]](https://de.wikipedia.org/wiki/Datei:NGC_0639_DSS.jpg)
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| NGC 639 | |
| AladinLite | |
| Constellation | sculptor |
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Position equinox : J2000.0 , epoch : J2000.0 |
|
| Right ascension | 01 h 38 m 59.045 s |
| declination | -29 ° 55 ′ 31.18 ″ |
| Appearance | |
| Morphological type | Sa? |
| Brightness (visual) | 13.8 mag |
| Brightness (B-band) | 14.7 mag |
| Angular expansion | 1.0 ′ × 0.2 ′ |
| Position angle | 31 ° |
| Surface brightness | 11.9 mag / arcmin² |
| Physical data | |
| Redshift | 0.019253 ± 0.000143 |
| Radial velocity | 5772 ± 43 km / s |
|
Stroke distance v rad / H 0 |
(256 ± 18) · 10 6 ly (78.5 ± 5.5) Mpc |
| history | |
| discovery | John Herschel |
| Discovery date | September 27, 1834 |
| Catalog names | |
| NGC 639 • PGC 6105 • ESO 413-013 • MCG -05-05-002 • IRAS 01367-3010 • 2MASX J01385924-2955274 • SGC 013641-3010.7 • GC 379 • h 2430 • NVSS J013859-295527 | |
NGC 639 is a spiral galaxy of Hubble type Sa in the constellation Sculptor at the southern sky . It is an estimated 256 million light years away from the Milky Way and about 75,000 light years in diameter. It probably forms a gravitationally bound galaxy pair with NGC 642 .
The object was discovered on September 27, 1834 by the British astronomer John Herschel .
Web links
- SIMBAD Astronomical Database
- Auke Slotegraaf : NGC 639. Deep Sky Observer's Companion, accessed September 4, 2015 .