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Everything about Messier 14 totally explained

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Messier 14 (also known as M14 or NGC 6402) is a globular cluster in the constellation Ophiuchus. It was discovered by Charles Messier in 1764.
   At a distance of about 30,000 light-years, M14 contains several 100,000 stars. At a brightness of magnitude 7.6 it can be easily observed with binoculars and medium sized telescopes begin to show some hint of the individual stars of which the brightest is of magnitude +14.
   The total luminosity of M14 is in the order of 400,000 times that of the Sun corresponding to an absolute magnitude of -9.12. The shape of the cluster is decidedly elongated. M14 spans about 100 light-years across.
   A respectable total of 70 variable stars are known in M14, many of the W Virginis variety common in globular clusters. In 1938, a nova appeared in this globular cluster although this wasn't discovered until photographic plates from that time were studied in 1964. It is estimated that the nova reached a maximum brightness of magnitude +9.2, over 5 times brighter than the brightest "normal" star in the cluster.
   Slightly over 3° southwest of M14 lies the faint globular cluster NGC 6366.

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