NGC 6217
| Galaxy NGC 6217 |
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|---|---|
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| Image of the Hubble Space Telescope from NGC 6217 | |
| AladinLite | |
| Constellation | Little Bear |
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Position equinox : J2000.0 , epoch : J2000.0 |
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| Right ascension | 16 h 32 m 39.2 s |
| declination | + 78 ° 11 ′ 53 ″ |
| Appearance | |
| Morphological type | (R) SB (rs) bc / HII / Sy2 |
| Brightness (visual) | 11.0 mag |
| Brightness (B-band) | 11.8 mag |
| Angular expansion | 3 ′ × 2.5 ′ |
| Position angle | 153 ° |
| Surface brightness | 13.0 mag / arcmin² |
| Physical data | |
| Redshift | 0.004543 ± 0.000013 |
| Radial velocity | (1362 ± 4) km / s |
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Stroke distance v rad / H 0 |
(69 ± 5) · 10 6 ly (21.1 ± 1.5) Mpc |
| history | |
| discovery | Wilhelm Herschel |
| Discovery date | December 12, 1797 |
| Catalog names | |
| NGC 6217 • UGC 10470 • PGC 58477 • CGCG 355-014 • MCG + 13-12-08 • IRAS 16350 + 7818 • 2MASX J16323921 + 7811535 • Arp 185 • GC 4236 • H I 280 • Kaz 73 | |
NGC 6217 = Arp 185 is an active bar-spiral galaxy with extensive star formation areas in the constellation Little Bear . The galaxy is estimated to be 70 million light years from the Milky Way and about 55,000 light years across .
Halton Arp organized his catalog of unusual galaxies into groups according to purely morphological criteria. This galaxy belongs to the class of narrow filament galaxies .
The object was discovered on December 12, 1797 by the German-British astronomer Wilhelm Herschel .
Web links
Commons : NGC 6217 - collection of images, videos, and audio files
- Hubble Space Telescope
- Active Spiral Galaxy NGC 6217 (ROSAT)
- 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