Messier 92
Globular cluster Messier 92 / NGC 6341 |
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SDSS | |
AladinLite | |
Constellation | Hercules |
Position equinox : J2000.0 , epoch : J2000.0 |
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Right ascension | 17 h 17 m 07.3 s |
declination | + 43 ° 08 ′ 11 ″ |
Appearance | |
Concentration class | IV |
Brightness (visual) | 6.5 mag |
Angular expansion | 14.0 ' |
Physical data | |
Redshift | −0.000402 ± 0.000006 |
Radial velocity | −120.5 ± 1.7 km / s |
distance | 27 kLj (8 kpc ) |
history | |
discovery | Johann Elert Bode |
Discovery date | December 27, 1777 |
Catalog names | |
M 92 • NGC 6341 • C 1715 + 432 • GCl 59 • |
Messier 92 = NGC 6341 is a 6.3 mag bright globular cluster with an area of 14.0 ′ in the constellation Hercules in the northern sky . The distance from Messier 92 is about 26,000 light years , its mass is estimated to be about 330,000 solar masses . The very low metal abundance of only 0.6% of the solar element abundance suggests that this globular cluster is very old. In fact, measurements with the help of color-brightness diagrams show an age of around 13 billion years. It is one of the oldest known globular clusters.
Due to its great brightness and its northern location in the sky, M92 is already visible in binoculars in Central Europe . In small telescopes (four- to eight-inch ) the edge of the cluster can be resolved into individual stars.
M92 is found exactly 6.3 ° north of the star π Herculis. It is almost as bright as the better-known Hercules cluster M13 , but appears much more compact.
The object was discovered on December 27, 1777 by Johann Elert Bode and in 1781 (independently of Bode) by Charles Messier .
Web links
- SIMBAD Astronomical Database
- Messier 92 at SEDS
- Spektrum .de: amateur recordings [1]
Individual evidence
- ↑ NASA / IPAC EXTRAGALACTIC DATABASE
- ↑ Harlow Shapley, Helen B. Sawyer: A Classification of Globular Clusters . In: Harvard College Observatory Bulletin . tape 849 , 1927, pp. 11-14 , bibcode : 1927BHarO.849 ... 11S .
- ↑ SEDS : NGC 6341
- ↑ Messier 92 at SEDS
- ↑ Constellation Hercules ( Memento of the original from April 27, 2011 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. on Astronomie.de
- ↑ Seligman