Messier 108

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Galaxy
Messier 108
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SDSS recording
SDSS recording
AladinLite
Constellation Big Bear
Position
equinox :  J2000.0 , epoch : J2000.0
Right ascension 11 h 11 m 31.0 s
declination + 55 ° 40 ′ 27 ″
Appearance
Morphological type SAB (s) c; / HII / Sy1  
Brightness  (visual) 9.9 likes
Brightness  (B-band) 10.6 mag
Angular expansion 8.6 ′ × 2.4 ′
Position angle 80 °
Surface brightness 13.0 mag / arcmin²
Physical data
Redshift (2332 ± 30)  ·  10 −6  
Radial velocity 699 ± 9 km / s  
Stroke distance
v rad  / H 0 		(34 ± 2)  x  10 6  ly
(10.53 ± 0.75)  Mpc 
history
discovery Pierre Méchain
Discovery date February 16, 1781
Catalog names
M  108 • NGC  3556 • UGC  6225 • PGC  34030 • CGCG  267-48 • CGCG 268-1 • MCG  + 09-18-098 • IRAS  11085 + 5556 • GC  2318 • H  V 46 • h  831 • Kara 469

Messier 108 (also known as NGC 3556 ) is a spiral galaxy of the Hubble type Sc with dimensions 8.6 ′ × 2.4 ′ and an apparent magnitude of 9.9 mag in the constellation of Great Bear .

According to previous measurements, the galaxy is about 34 million light years away from the Milky Way and thus has a diameter of the order of 100,000 light years .

With the Chandra X-ray telescope , many starburst regions were found in the galaxy , in which a large number of stars are formed simultaneously in a small space . They are surrounded by hot gas bubbles, which are heated by the extremely strong stellar winds of massive Wolf-Rayet stars and by supernova explosions and driven out of the galactic disk. The gas bubbles glow diffusely in the X-ray light .

On February 6, 1969, a supernova was discovered in this galaxy , which reached a brightness of 16 mag.

M108 was discovered on February 16, 1781 by the French astronomer Pierre Méchain .

Web links

Commons : Messier 108  - album with pictures, videos and audio files

Individual evidence

  1. ↑ a b c d NASA / IPAC EXTRAGALACTIC DATABASE
  2. ↑ a b c d e SEDS : NGC 3556
  3. ↑ Michael Fritz: Sight in X-Ray Light; in: Stars and Space , April 2009, p. 76
  4. ^ Klaus-Peter Schröder: Unequal Neighbors; in: Stars and Space, March 2013, p. 77 f.
  5. ↑ Seligman