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It is located 170,000 ly from the galactic core, and is the brightest ( absolute magnitude) globular cluster in the Local Group, having an apparent magnitude of 13.7 . G1 is considered to have twice the mass of Omega Centauri
Because of the widespread distribution of metallicity, indicating multiple star generations and a large stellar creation period, many contned that it is not a true globular cluster, but is actually the galactic core that remains of a dwarf galaxy consumed by Andromeda.
Mayall II is named after N.U. Mayall and O.J. Eggen in 1953
SKHB 1 is named for W.L.W. Sargent , C.T. Kowal , F.D.A. Hartwick , S. van den Bergh . They also named it G1 in 1977.
HBK 0-1 is named for J.P. Huchra , J.P. Brodie , and S.M. Kent in 1991.
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