Mayall II
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| Mayall II | |
.jpg/280px-HST_G1_(Mayall_II).jpg) Hubble Telescope image of Mayall II |
|
| Observation data (J2000 epoch) | |
|---|---|
| Constellation | Andromeda |
| Right ascension | 00h 32m 46.51s[1] |
| Declination | +39° 34′ 39.7″[1] |
| Distance | 2.52 ± 0.14 Mly (770 ± 40 kpc) |
| Apparent magnitude (V) | +13.7[1] |
| Physical characteristics | |
| Mass | kg ( M ) |
| Other designations | SKHB 1, HBK 0- 1[1] |
| See also: Globular cluster, List of globular clusters | |
Mayall II (M31 G1) also known as NGC-224-G1, SKHB 1, GSC 2788:2139, HBK 0-1 or Andromeda's Cluster is a globular cluster in M31, the Andromeda Galaxy.
It is located 170,000 light-years 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.[2]
Mayall II is named after Nicholas U. Mayall and O.J. Eggen in 1953.
SKHB 1 is named for Wallace L. W. Sargent, C.T. Kowal, F.D.A. Hartwick, Sidney 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.
[edit] References
- ^ a b c d SIMBAD Astronomical Database. Results for Mayall II. Retrieved on 2006-11-17.
- ^ Meylan, 2001, "G1 in M31 - Giant Globular Cluster or Core of a Dwarf Elliptical Galaxy?", arXiv
