NGC 4640
| Galaxy NGC 4640 |
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|---|---|
![LEDA 214021, NGC 4640 & LEDA 42737 [1] SDSS mount](https://de.wikipedia.org/wiki/Datei:NGC4640_-_SDSS_DR14.jpg)
|
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| LEDA 214021, NGC 4640 & LEDA 42737 SDSS Recording | |
| AladinLite | |
| Constellation | Virgin |
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Position equinox : J2000.0 , epoch : J2000.0 |
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| Right ascension | 12 h 42 m 57.8 s |
| declination | + 12 ° 17 ′ 13 ″ |
| Appearance | |
| Morphological type | dS0, N |
| Brightness (visual) | 13.4 mag |
| Brightness (B-band) | 14.2 mag |
| Angular expansion | 1.4 ′ × 0.8 ′ |
| Position angle | 45 ° |
| Surface brightness | 13.4 mag / arcmin² |
| Physical data | |
| Affiliation | Virgo cluster |
| Redshift | 0.006441 ± 0.000037 |
| Radial velocity | 1931 ± 11 km / s |
|
Stroke distance v rad / H 0 |
(84 ± 6) · 10 6 ly (25.8 ± 1.8) Mpc |
| history | |
| discovery | Lewis Swift |
| Discovery date | April 17, 1887 |
| Catalog names | |
| NGC 4640 • 4640A • UGC 7888 • PGC 42753 • CGCG 071-009 • MCG + 02-32-190 • 2MASX J12425775 + 1217121 • VCC 1949 • GALEX ASC J124257.60 + 121713.1 • USGC U490 NED43 • EVCC 1082 • HOLM 446A | |
NGC 4640 (also NGC 4640A ) is a 13.4 mag bright galaxy of the Hubble type SB (0?) In the constellation of Virgo on the ecliptic . It is an estimated 84 million light years away from the Milky Way and about 35,000 light years in diameter. It is listed as a member of the Virgo galaxy cluster under catalog number VCC 1949 .
Together with the galaxy PGC 214021 (also NGC 4640 B ), which is about ten times further away , it forms the optical galaxy pair Holm 446 .
In the same area of the sky are the galaxies NGC 4641 , IC 810 , IC 3663 , IC 3710 .
The object was discovered by Lewis A. Swift on April 17, 1887 .
Web links
- NGC 4640. SIMBAD , accessed January 28, 2015 .
- NGC 4640. DSO Browser, accessed January 28, 2015 .
- Auke Slotegraaf : NGC 4640. Deep Sky Observer's Companion, accessed on January 28, 2015 (English).