Zeta Herculis

great hercules cluster,m13,hercules globular cluster

Messier 13: Hercules Globular Cluster

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Messier 13 (M13), also known as the Great Globular Cluster in Hercules, is a globular cluster located in Hercules constellation. It is one of the brightest and best known globular clusters in the northern sky. The cluster has an apparent magnitude of 5.8 and lies at a distance of 22,200 light years, or 6,800 parsecs, from Earth. Its designation in the New General Catalogue is NGC 6205.
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