NGC 2685
| Galaxy NGC 2685 |
|
|---|---|
|
|
| Photo from the Hubble Space Telescope | |
| AladinLite | |
| Constellation | Big Bear |
|
Position equinox : J2000.0 , epoch : J2000.0 |
|
| Right ascension | 08 h 55 m 34.7 s |
| declination | + 58 ° 44 ′ 04 ″ |
| Appearance | |
| Morphological type | (R) SB0 + pec; RETSy2 |
| Brightness (visual) | 11.2 mag |
| Brightness (B-band) | 12.1 mag |
| Angular expansion | 4.6 ′ × 2.5 ′ |
| Position angle | 38 ° |
| Surface brightness | 13.7 mag / arcmin² |
| Physical data | |
| Redshift | 0.002945 ± 0.000013 |
| Radial velocity | (+883 ± 4) km / s |
|
Stroke distance v rad / H 0 |
(42 ± 3) · 10 6 ly (13 ± 0.9) Mpc |
| history | |
| discovery | Ernst Wilhelm Leberecht Temple |
| Discovery date | August 18, 1882 |
| Catalog names | |
| NGC 2685 • UGC 4666 • PGC 25065 • CGCG 288-012 • MCG + 10-13-39 • IRAS 08517 + 5855 • Arp 336 • PRC A-3 | |
NGC 2685 = Arp 336 , also known as Helix Galaxy and Pancake Galaxy is a polar-ring galaxy from the Hubble type SB0 in the constellation Ursa Major at the northern sky . It is estimated to be 42 million light years away from the Milky Way and about 50,000 light years in diameter. Halton Arp organized his catalog of unusual galaxies into groups according to purely morphological criteria. This galaxy belongs to the class Various (Arp catalog) .
The object was discovered on August 18, 1882 by Ernst Wilhelm Leberecht Tempel .
Web links
- Spektrum.de : Amateur recordings [1]
- ARP ATLAS OF PECULIAR GALAXIES
- Seligman Arp
literature
- Jeff Kanipe and Dennis Webb: The Arp Atlas of Peculiar Galaxies - A Chronicle and Observer's Guide , Richmond 2006, ISBN 978-0-943396-76-7