Messier 91
| Galaxy Messier 91 |
|
|---|---|
|
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| Image taken with the 81 cm reflecting telescope of the Mount Lemmon Observatory . | |
| AladinLite | |
| Constellation | Berenike's hair |
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Position equinox : J2000.0 , epoch : J2000.0 |
|
| Right ascension | 12 h 35 m 26.4 s |
| declination | + 14 ° 29 ′ 47 ″ |
| Appearance | |
| Morphological type | SBb (rs); LINER Sy |
| Brightness (visual) | 10.1 mag |
| Brightness (B-band) | 10.9 likes |
| Angular expansion | 5.2 ′ × 4.2 ′ |
| Position angle | 150 ° |
| Surface brightness | 13.3 mag / arcmin² |
| Physical data | |
| Affiliation | Virgo Galaxy Clusters |
| Redshift | +0.001621 ± 0.000013 |
| Radial velocity | +486 ± 4 km / s |
|
Stroke distance v rad / H 0 |
(20 ± 1) x 10 6 ly (6.06 ± 0.43) Mpc |
| history | |
| discovery | Wilhelm Herschel |
| Discovery date | April 8, 1784 |
| Catalog names | |
| M 91 • NGC 4548 • UGC 7753 • PGC 41934 • CGCG 099-096 • MCG + 03-32-75 • IRAS 12328 + 1446 • 2MASX J12352642 + 1429467 • VCC 1615 • GC 3093 • H II 120 • h 1345 • HIPASS J1235 +14 | |
Messier 91 (also known as NGC 4548 ) is a 10.1 mag bright bar- spiral galaxy with an area of 5.2 '× 4.2' in the constellation Haar der Berenike . Distance measurements with the help of variable stars of the Cepheid class showed a distance to the Milky Way of about 20 million light years. The diameter is around 83,000 light years, the total mass is given as around 100 billion solar masses .
Messier 91 was discovered on April 8, 1784 by the German-British astronomer Friedrich Wilhelm Herschel . The assignment of NGC 4548 to object number 91 from the Messier catalog has long been controversial, as Messier incorrectly stated the coordinates in his records relative to Messier 58 , but probably meant Messier 89 .
Web links
Commons : Messier 91 - collection of images, videos and audio files
Individual evidence
- ↑ a b c d NASA / IPAC EXTRAGALACTIC DATABASE
- ↑ a b c d e SEDS : NGC 4548
- ↑ SuW 04.2017 p. 64
- ↑ Seligman
