Messier 108
Galaxy Messier 108 |
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SDSS recording | |
AladinLite | |
Constellation | Big Bear |
Position equinox : J2000.0 , epoch : J2000.0 |
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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
- M108 at SEDS
- Spektrum.de : Amateur recordings [1] [2]
Individual evidence
- ↑ a b c d NASA / IPAC EXTRAGALACTIC DATABASE
- ↑ a b c d e SEDS : NGC 3556
- ↑ Michael Fritz: Sight in X-Ray Light; in: Stars and Space , April 2009, p. 76
- ^ Klaus-Peter Schröder: Unequal Neighbors; in: Stars and Space, March 2013, p. 77 f.
- ↑ Seligman