Celestial hemisphere:  Southern  ·  Constellation: Ophiuchus (Oph)  ·  Contains:  M 12  ·  NGC 6218  ·  PGC 1101748  ·  PGC 1101781  ·  PGC 1102958  ·  PGC 1103219  ·  PGC 1103420  ·  PGC 1110851
M12 Gumball Globular NGC6218, Jerry Macon
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M12 Gumball Globular NGC6218

M12 Gumball Globular NGC6218, Jerry Macon
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M12 Gumball Globular NGC6218

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Description

Messier 12 or M12 is a globular cluster in the constellation of Ophiuchus. It was discovered by the French astronomer Charles Messier on May 30, 1764, who described it as a "nebula without stars". In dark conditions this cluster can be faintly seen with a pair of binoculars. Resolving the stellar components requires a telescope with an aperture of 8 in or greater. In a 10 in scope, the granular core shows a diameter of 3 arcminutes surrounded by a 10 arcminute halo of stars.

Located roughly 3° in the sky from the cluster M10 and 5.6° from the star Lambda Ophiuchi, M12 is about 15,700 light-years from Earth and has a spatial diameter of about 75 light-years. The brightest stars of M12 are of 12th magnitude. With a Shapley-Sawyer rating of IX, it is rather loosely packed for a globular and was once thought to be a tightly concentrated open cluster. Thirteen variable stars have been recorded in this cluster. M12 is approaching us at a velocity of 16 km/s.

A study published in 2006 concluded that this cluster has an unusually low number of low mass stars. The authors surmise that they were stripped from the cluster by the gravitational influence of the Milky Way.
(Wilipedia)

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M12 Gumball Globular NGC6218, Jerry Macon

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