Great Cluster in Hercules

Great Cluster in Hercules

(M13; NGC 6205) The finest globular cluster to be seen from the northern hemisphere, discovered in Hercules by Edmund Halley in 1714. It has a dense broad center that is just visible to the naked eye; a 7.5-cm telescope will show some of the outer stars.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
References in periodicals archive ?
The other great deep-sky showpiece in this area is Messier 13, the Great Cluster in Hercules. It's quite easy to spot once you've located the four faintish stars of the Keystone, which marks Hercules' kilt or skirt.
M5 is 24,500 light-years from Earth, while M13, the celebrated Great Cluster in Hercules, is 25,100 light-years away.
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