Messier 12, from 2MASS
|Observation data (J2000 epoch)|
|Right ascension||16h 47m 14.52s|
|Declination||-01° 56′ 52.1″|
|Distance||16.0 kly (4.9 kpc)|
|Apparent magnitude (V)||+7.68|
|Apparent dimensions (V)||16′.0|
|Mass||kg ( M)|
|Other designations||NGC 6218|
Located roughly 3° in the sky from the cluster M10, M12 is about 16,000 w:light-years from Earth and has a spatial diameter of about 75 light-years. The brightest stars of M12 are of 12th magnitude. It is rather loosely packed for a globular and was once thought to be a tightly concentrated w:open cluster. Thirteen w:variable stars have been recorded in this cluster.
A study published in w: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 w:Milky Way.