NGC 6101 (also known as Caldwell 107) is a globular cluster in the constellation Apus, which was discovered by James Dunlop and catalogued by him as Δ68. It is located at a distance of about 47,600 light-years from the Sun and about 36,500 light-years from the galactic center of the Milky Way. It requires a telescope of at least 20 cm (7.9 in) aperture to resolve individual stars.[3] Research revealed this cluster to contain an unexpected large number of black holes.[5]

NGC 6101
NGC 6101.jpg
Hubble Space Telescope image of the central region of NGC 6101
Observation data (J2000 epoch)
Right ascension16h 25m 48.12s[2]
Declination–72° 12′ 07.9″[2]
Apparent magnitude (V)9[3]
Apparent dimensions (V)10.7'[3]
Physical characteristics
Metallicity = –1.76[4] dex
Estimated age12.54 Gyr[4]
Other designationsCaldwell 107
See also: Globular cluster, List of globular clusters


  1. ^ Shapley, Harlow; Sawyer, Helen B. (August 1927), "A Classification of Globular Clusters", Harvard College Observatory Bulletin, 849 (849): 11–14, Bibcode:1927BHarO.849...11S.
  2. ^ a b Goldsbury, Ryan; et al. (December 2010), "The ACS Survey of Galactic Globular Clusters. X. New Determinations of Centers for 65 Clusters", The Astronomical Journal, 140 (6): 1830–1837, arXiv:1008.2755, Bibcode:2010AJ....140.1830G, doi:10.1088/0004-6256/140/6/1830.
  3. ^ a b c Dunlop, Storm (2005). Atlas of the Night Sky. Collins. ISBN 978-0-00-717223-8.
  4. ^ a b Forbes, Duncan A.; Bridges, Terry (May 2010), "Accreted versus in situ Milky Way globular clusters", Monthly Notices of the Royal Astronomical Society, 404 (3): 1203–1214, arXiv:1001.4289, Bibcode:2010MNRAS.404.1203F, doi:10.1111/j.1365-2966.2010.16373.x.
  5. ^ Monthly Notices of the Royal Astronomical Society. nov 2016, published online aug 22 2016

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