NGC 2857
| Galaxy NGC 2857 |
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|---|---|
![NGC 2857 with SDSS J092445.36 + 492234.2 [1] (lo)](https://de.wikipedia.org/wiki/Datei:NGC2857_-_SDSS_DR14.jpg)
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| NGC 2857 with SDSS J092445.36 + 492234.2 (lo) | |
| AladinLite | |
| Constellation | Big Bear |
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Position equinox : J2000.0 , epoch : J2000.0 |
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| Right ascension | 09 h 24 m 37.7 s |
| declination | + 49 ° 21 ′ 25 ″ |
| Appearance | |
| Morphological type | SA (s) c / LINER |
| Brightness (visual) | 12.5 mag |
| Brightness (B-band) | 13.2 mag |
| Angular expansion | 2.2 ′ × 2 ′ |
| Position angle | 138 ° |
| Surface brightness | 14.0 mag / arcmin² |
| Physical data | |
| Affiliation | WBL 221-003 LGG 168 |
| Redshift | 0.016301 ± 0.000023 |
| Radial velocity | (4887 ± 7) km / s |
|
Stroke distance v rad / H 0 |
(220 ± 15) · 10 6 ly (67.4 ± 4.7) Mpc |
| history | |
| discovery | RJ Mitchell |
| Discovery date | January 9, 1856 |
| Catalog names | |
| NGC 2857 • UGC 5000 • PGC 26666 • CGCG 238-049 • MCG + 08-17-095 • IRAS 09212 + 4934 • 2MASX J09243769 + 4921256 • Arp 1 • NSA 34021 | |
NGC 2857 = Arp 1 is a spiral galaxy with an active nucleus of the Hubble type Sc in the constellation Ursa Major in the northern sky . It is an estimated 220 million light-years away from the Milky Way and about 140,000 light-years in diameter . In the same area of the sky are u. a. the galaxies NGC 2854 and NGC 2856 .
Halton Arp organized his catalog of unusual galaxies into groups according to purely morphological criteria. This galaxy belongs to the class spiral galaxies with low surface brightness (Arp catalog) .
The type IIP supernova SN 2012fg was observed here.
The object was added to his New General Catalog on January 9, 1856 by the astronomer RJ Mitchell and later by Johan Dreyer .
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
Web links
Commons : NGC 2857 - collection of images, videos, and audio files
