Celestial hemisphere:  Northern  ·  Constellation: Hercules (Her)  ·  Contains:  HD150679  ·  HD150998  ·  Hercules Globular Cluster  ·  IC 4617  ·  M 13  ·  NGC 6205  ·  NGC 6207
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M13 The Great Cluster in Hecules, George C. Lutch
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M13 The Great Cluster in Hecules

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M13 The Great Cluster in Hecules, George C. Lutch
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M13 The Great Cluster in Hecules

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About 145 light-years in diameter, M13 is composed of several hundred thousand stars, the brightest of which is a red giant, the variable star V11, also known as V1554 Herculis,[12] with an apparent visual magnitude of 11.95. M13 is 22,200–25,000 light-years away from Earth,[13] and the globular cluster is one of over one hundred that orbit the center of the Milky Way.[14][15]

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M13 The Great Cluster in Hecules, George C. Lutch