NGC 6217

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Galaxy
NGC 6217
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NGC 6217 hs-2009-25-bc-full.jpg
Image of the Hubble Space Telescope from NGC 6217
AladinLite
Constellation Little Bear
Position
equinoxJ2000.0 , epoch : J2000.0
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  
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

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

Individual evidence

  1. a b c d NASA / IPAC EXTRAGALACTIC DATABASE
  2. a b c d e f SEDS : NGC 6217
  3. Seligman