Barnard's Galaxy

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Galaxy
Barnard's Galaxy
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MPG / ESO telescope image of Barnard's Galaxy (NGC 6822)
MPG / ESO telescope image of Barnard's Galaxy (NGC 6822)
AladinLite
Constellation Sagittarius
Position
equinox :  J2000.0 , epoch : J2000.0
Right ascension 19 h 44 m 57.7 s
declination −14 ° 48 ′ 12 ″
Appearance
Morphological type IB (s) m  
Brightness  (visual) 8.7 likes
Brightness  (B-band) 9.3 mag
Angular expansion 15.4 ′ × 14.2 ′
Position angle 5 °
Surface brightness 14.4 mag / arcmin²
Physical data
Affiliation Local group  
Redshift -0.000190 ± 0.000007  
Radial velocity −57 ± 2 km / s  
distance (1.60 ± 0:13)  ·  10 6 Lj /
(12:49 ± 0.04)  ·  10 6 pc
Absolute brightness −16.4 mag
diameter 6000 ly
history
discovery EE Barnard
Discovery date 17th August 1884
Catalog names
NGC  6822 • IC  4895 • PGC  63616 • MCG  -2-50-6 • IRAS  19421-1455 • HIPASS J1944-14 • DDO  209

Barnard's Galaxy (also known as NGC 6822 and IC 4895 ) is an 8.7  mag bright irregular dwarf galaxy with an area of ​​15.4 '× 14.5' in the constellation Sagittarius . It's about 1.6 million light years away and about 8,000 light years in diameter.

The dwarf has about 10 million stars (Milky Way: 400 billion stars) and 150 star formation areas, which can be seen in the picture on the right as red "bubbles". The galaxy is a member of the local group .

Although Barnard's galaxy is one of the 50 brightest galaxies in the sky, it is difficult to observe in Central Europe because of its low surface brightness and its southerly position.

The name of this galaxy refers to Edward Emerson Barnard , who discovered it as a foggy object on August 17, 1884.

Web links

Commons : Barnards Galaxie  - collection of images, videos and audio files

Individual evidence

  1. ↑ a b c NASA / IPAC EXTRAGALACTIC DATABASE
  2. ↑ a b c d e SEDS : IC 4895
  3. ↑ Scott, Carole., United States. National Aeronautics and Space Administration .: Space - the universe: a unique journey through the universe: [with new images from NASA] . Dorling Kindersley, Munich 2011, ISBN 978-3-8310-1972-4 .
  4. ↑ Seligman
  5. ↑ http://www.eso.org/public/germany/news/eso0938/