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Contains:  M 92, NGC 6341
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M92 Globular Cluster (NGC 6341), 


            Douglas J Struble
M92 Globular Cluster (NGC 6341)

M92 Globular Cluster (NGC 6341)

Technical card

Resolution: 2935x2347

Dates:May 25, 2018May 26, 2018

Astrnomik CLS-CCD: 104x60" -20C bin 1x1
Astrodon Blue Tru-Balance E-Series Gen 2: 61x60" -20C bin 1x1
Astrodon Green Tru-Balance E-Series Gen 2: 60x60" -20C bin 1x1
Astrodon Red Tru-Balance E-Series Gen 2: 60x60" -20C bin 1x1

Integration: 4.8 hours

Darks: ~50

Flats: ~50

Bias: ~250

Avg. Moon age: 11.31 days

Avg. Moon phase: 86.90%

Bortle Dark-Sky Scale: 6.00 job: 2077014

RA center: 259.282 degrees

DEC center: 43.134 degrees

Pixel scale: 0.648 arcsec/pixel

Orientation: 290.316 degrees

Field radius: 0.338 degrees

Locations: Backyard Red Zone Observatory, Taylor, MI, Michigan, United States

Data source: Backyard


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.



Douglas J Struble
License: None (All rights reserved)

Sky plot

Sky plot


M92 Globular Cluster (NGC 6341), 


            Douglas J Struble