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.
![](https://upload.wikimedia.org/wikipedia/commons/thumb/3/37/All_that_glitters_HST.jpg/220px-All_that_glitters_HST.jpg)
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