NGC 640
| Galaxy NGC 640 |
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|---|---|
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| SDSS recording | |
| AladinLite | |
| Constellation | whale |
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Position equinox : J2000.0 , epoch : J2000.0 |
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| Right ascension | 01 h 39 m 24.9 s |
| declination | -09 ° 24 ′ 04 ″ |
| Appearance | |
| Morphological type | Sa / Sy2 |
| Brightness (visual) | 15.0 mag |
| Brightness (B-band) | 15.9 mag |
| Angular expansion | 0.7 ′ × 0.5 ′ |
| Position angle | 145 ° |
| Surface brightness | 13.7 mag / arcmin² |
| Physical data | |
| Redshift | 0.025111 ± 0.000043 |
| Radial velocity | 7528 ± 13 km / s |
|
Stroke distance v rad / H 0 |
(337 ± 23) x 10 6 ly (103.4 ± 7.2) Mpc |
| history | |
| discovery | Francis Preserved Leavenworth |
| Discovery date | 1886 |
| Catalog names | |
| NGC 640 • PGC 6130 • MCG -02-05-031 • IRAS F01368-0939 • 2MASX J01392485-0924042 • GALEXASC J013924.85-092404.2 • GIN 91 | |
NGC 640 is a spiral galaxy with an active nucleus of the Hubble type Sa in the constellation Whale south of the ecliptic . It is estimated to be 337 million light years away from the Milky Way and has a diameter of around 70,000 ly.
In the same area of the sky are the galaxies NGC 647 and NGC 649 .
The object was discovered in 1886 by the American astronomer Francis Preserved Leavenworth .
Web links
Commons : NGC 640 - collection of images, videos, and audio files
- SIMBAD Astronomical Database
- Auke Slotegraaf: NGC 640. Deep Sky Observer's Companion, accessed September 4, 2015 .