NGC 7640
| Galaxy NGC 7640 |
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|---|---|
![NGC 7640 [1] Hubble Space Telescope](https://upload.wikimedia.org/wikipedia/commons/thumb/2/26/NGC_7640_-_HST_-_Potw1706a.tif/lossy-page1-300px-NGC_7640_-_HST_-_Potw1706a.tif.jpg)
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| NGC 7640 Hubble Space Telescope | |
| AladinLite | |
| Constellation | Andromeda |
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Position equinox : J2000.0 , epoch : J2000.0 |
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| Right ascension | 23 h 22 m 06.58 s |
| declination | + 40 ° 50 ′ 43.5 ″ |
| Appearance | |
| Morphological type | SB (s) c / HII |
| Brightness (visual) | 11.1 mag |
| Brightness (B-band) | 11.8 mag |
| Angular expansion | 10.5 ′ × 1.8 ′ |
| Position angle | 167 ° |
| Surface brightness | 14.1 mag / arcmin² |
| Physical data | |
| Redshift | 0.001231 ± 0.000004 |
| Radial velocity | 369 ± 1 km / s |
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Stroke distance v rad / H 0 |
(26 ± 2) x 10 6 ly (7.90 ± 0.56) Mpc |
| history | |
| discovery | Wilhelm Herschel |
| Discovery date | October 17, 1786 |
| Catalog names | |
| NGC 7640 • UGC 12554 • PGC 71220 • CGCG 532-017 • CGCG 533-001 • MCG + 07-48-002 • IRAS 23197 + 4034 • 2MASX J23220658 + 4050435 • GC 4950 • H II 600 • h 2236 • 2MASS J23220658 + 4050407 • NVSS J232205 + 405050 • KTG 80A | |
NGC 7640 is a bar-spiral galaxy with extensive star formation regions of the Hubble type SBc in the constellation Andromeda in the northern sky . Recent observations suggest that the increased star formation is due to absorption of matter after a collision with a smaller galaxy.
It is estimated to be 26 million light years away from the Milky Way and about 60,000 light years in diameter . Together with PGC 71368 and PGC 71596 it forms the isolated galaxy trio KTG 80 .
The object was discovered on October 17, 1786 by the German-British astronomer Wilhelm Herschel using his 18.7-inch mirror telescope.
WebLinks
- SIMBAD Astronomical Database
- astronews.com: Picture of the day February 9, 2017
- Spektrum .de: amateur recordings [1]