NGC 6101

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
Hubble Space Telescope image of the central region of NGC 6101
Observation data (J2000 epoch)
Class	X[1]
Constellation	Apus
Right ascension	16h 25m 48.12s[2]
Declination	–72° 12′ 07.9″[2]
Apparent magnitude (V)	9[3]
Apparent dimensions (V)	10.7'[3]
Physical characteristics
Metallicity	${\displaystyle {\begin{smallmatrix}\left[{\ce {Fe}}/{\ce {H}}\right]\end{smallmatrix}}}$ = –1.76[4] dex
Estimated age	12.54 Gyr[4]
Other designations	Caldwell 107
See also: Globular cluster, List of globular clusters