M92 Globular Cluster (NGC 6341) (Douglas J Struble)

Celestial hemisphere: Northern · Constellation: Hercules (Her) · Contains: M 92 · NGC 6341

M92 Globular Cluster (NGC 6341), Douglas J Struble

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M92 Globular Cluster (NGC 6341)

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M92 Globular Cluster (NGC 6341)

Messier 92 (M92) is a globular cluster located in the northern constellation Hercules.

The cluster lies at a distance of 26,700 light years from Earth and has an apparent magnitude of 6.3. Its designation in the New General Catalogue is NGC 6341.

Messier 92 occupies an area of 14 arc minutes of apparent sky, which corresponds to a linear extension of 109 light years. It is positioned north of the Keystone asterism in Hercules, between the Keystone star Eta Herculis and Iota Herculis. The cluster lies about 60 percent of the way from Eta to Iota. It forms a triangle with the two northernmost stars of the Keystone, Eta and Pi Herculis, which form the widest part of the asterism.

M92 can also be found by first locating the bright Etamin (Eltanin, Gamma Draconis), an orange giant in Draco, and then moving about 6 degrees in the direction of the Keystone.

Messier 92 is one of the brighter northern globulars – both visually and in terms of absolute magnitude – and can be seen without binoculars under good conditions. It is, however, not as popular a target for amateur astronomers as the brighter and larger Hercules Globular Cluster (M13), which lies in the vicinity. M92 has a much denser core and is more difficult to resolve than M13.

Messier 92 has an estimated mass of up to 330,000 solar masses. The cluster is approaching us at 112 km/s.

With an estimated age of 14.2 billion years – almost the same age as the universe itself – M92 is one of the oldest clusters known and possibly the single oldest globular in the Milky Way. The cluster has an extremely low abundance of elements other than hydrogen and helium, with only 0.5 percent of the Sun’s metallicity.

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The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

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M92 Globular Cluster (NGC 6341)

M92 Globular Cluster (NGC 6341)

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M92 Globular Cluster (NGC 6341)

M92 Globular Cluster (NGC 6341)

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