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NGC 6101

Proper NameNone
Caldwell NumberC107
NGC/IC NumberNGC 6101
Right Ascension16h 25m 48s
Declination-72° 12' 8"
Distancec.47,600 light years
c.14,600 parsecs
MagnitudeApparent: +9.2
Absolute: -6.8
DiameterApparent: 5'
Actual: c.73 light years
Optimum VisibilityJune (Usually visible from southern latitudes)

A member of the Milky Way's halo of globular clusters, C107 lies outside the plane of the Galaxy at a distance of some 47,600 light years from the Sun. Typically for a globular cluster, it is an ancient structure, estimated to be some 12.5 billion years old (which makes it only a billion years younger than the Galaxy itself).

Imagery provided by Aladin sky atlas

While globular clusters commonly form a distinctly spherical group of stars, C107 is a much looser cluster. On the Shapley-Sawyer scale, which ranges from class I (for extreme concentration towards the cluster's centre) to XII (for barely detectable concentration), C107 is rated as class X. Simulations of the cluster's patterns of gravity suggest that it contains a very large number of black holes among its stars.


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