NGC 6491
| Galaxy NGC 6491 |
|
|---|---|
![NGC 6491 [1] SDSS image](https://de.wikipedia.org/wiki/Datei:NGC6491_-_SDSS_DR14.jpg)
|
|
| NGC 6491 SDSS image | |
| AladinLite | |
| Constellation | Dragon |
|
Position equinox : J2000.0 , epoch : J2000.0 |
|
| Right ascension | 17 h 50 m 00.70 s |
| declination | + 61 ° 31 ′ 54.4 ″ |
| Appearance | |
| Morphological type | Sab |
| Brightness (visual) | 13.6 mag |
| Brightness (B-band) | 14.4 mag |
| Angular expansion | 1.2 ′ × 0.5 ′ |
| Position angle | 39 ° |
| Surface brightness | 12.9 mag / arcmin² |
| Physical data | |
| Redshift | 0.017922 ± 0.000057 |
| Radial velocity | 5373 ± 17 km / s |
|
Stroke distance v rad / H 0 |
(249 ± 18) x 10 6 ly (76.4 ± 5.4) Mpc |
| history | |
| discovery | Lewis Swift |
| Discovery date | June 13, 1885 |
| Catalog names | |
| NGC 6491 • NGC 6493A • UGC 11008 • PGC 60948 • PGC 60949 • CGCG 300-080 • MCG + 10-25-103 • IRAS 17494 + 6132 • 2MASX J17500071 + 6131542 • GALEX ASC J175000.77 + 613153.9 • NVSS J175000 + 613151 | |
NGC 6491 is a 13.8 likes bright spiral galaxy of Hubble type Sab in the constellation Draco the northern sky . It is an estimated 249 million light years away from the Milky Way and about 85,000 light years in diameter . Together with NGC 6493 , it forms an (optical) galaxy pair. In the same area of the sky are u. a. the galaxies NGC 6488 and IC 4669 .
The object was discovered by Lewis A. Swift on June 13, 1885 . The galaxy is listed twice in the catalog as NGC 6493A without explanation
Web links
- NGC 6491. SIMBAD , accessed August 7, 2016 .
- NGC 6491. DSO Browser, accessed August 7, 2016 .
- Auke Slotegraaf : NGC 6491. Deep Sky Observer's Companion, accessed on August 7, 2016 .