Mayall II

Mayall II, G1, SKHB 1, or HBK 0–1 is a globular cluster in M31, the Andromeda Galaxy.

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 contend 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.

See also

• Globular Cluster M54
• Omega Centauri

External links

• Astrophysical Journal, Vol. 370, p. 495–504
• Publications of the Astronomical Society of the Pacific, Vol. 65, No. 382, p. 24–29
• Astronomical Journal, vol. 82, p. 947–953