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Mayall II

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Group of stars in the constellation Andromeda

Mayall II
Hubble Telescope image of Mayall II
Observation data (J2000 epoch)
Constellation	Andromeda
Right ascension	00^h 32^m 46.51^s^[1]
Declination	+39° 34′ 39.7″^[1]
Distance	2.52 ± 0.14Mly (770 ± 40kpc)
Apparent magnitude (V)	+13.81^[1]
Physical characteristics
Mass	1×10⁷^[2] `M`_☉ (2×10³⁷ kg)
Radius	21.2 ± 1.0 ly (6.5 ± 0.3 pc) (Half light radius r_h) and tidal radius 263.2 ± 12.7 ly (80.7 ± 3.9 pc)^[3]
Estimated age	~ 12 Gyr^[2]
Other designations	SKHB 1, HBK 0-1^[1]
See also:Globular cluster,List of globular clusters

Mayall II, also known asNGC-224-G1,SKHB 1,GSC 2788:2139,HBK 0-1,M31GC J003247+393440 orAndromeda's Cluster, is aglobular cluster orbiting M31, theAndromeda Galaxy.

It is located 130,000light-years (40 kpc)^[3] from the Andromeda Galaxy's galactic core, and is the brightest^[3] (byabsolute magnitude) globular cluster in theLocal Group, with an absolute visual magnitude of −10.94 and the luminosity of 2 million Suns.^[4] It has anapparent magnitude of 13.81 in V band. Mayall II is considered to have twice the mass ofOmega Centauri, and may contain a central,intermediate-mass (~ 2×10⁴M_⊙)black hole.^[3]

It was first identified as a possible globular cluster by American astronomersNicholas Mayall andOlin J. Eggen in 1953 using aPalomar 48-inch (1.2 m)Schmidt plate exposed in 1948.^[3]

Because of the widespread distribution ofmetallicity, indicating multiplestar 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 adwarf galaxy consumed by Andromeda.^[3]^[5]

Origin of names

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Mayall II is named afterNicholas U. Mayall, who, withOlin J. Eggen, discovered it in 1953.
SKHB 1 is named forWallace L. W. Sargent,Charles T. Kowal,F. D. A. Hartwick andSidney van den Bergh. They also named it G1 in 1977.
HBK 0-1 is named forJohn Huchra,J. P. Brodie andS. M. Kent in 1991.^[4]

References

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^^a ^b ^c ^d"NAME Mayall II".SIMBAD.Centre de données astronomiques de Strasbourg. Retrieved2009-09-13.
^^a ^bMa, Jun; de Grijs, Richard; Fan, Zhou; Rey, Soo-Chang; Wu, Zhen-Yu; Zhou, Xu; Wu, Jiang-Hua; Jiang, Zhao-Ji; Chen, Jian-Sheng; Lee, Kyungsook; Sohn, Sangmo Tony (June 2009). "RESEARCH PAPER: Old stellar population synthesis: new age and mass estimates for Mayall II = G1".Research in Astronomy and Astrophysics.9 (6):641–652.arXiv:0904.0674.Bibcode:2009RAA.....9..641M.doi:10.1088/1674-4527/9/6/003.S2CID 16360116.
^^a ^b ^c ^d ^e ^fMa, J.; de Grijs, R.; Chen, D.; van den Bergh, S.; Fan, Z.; Wu, Z.; Wu, H.; Zhou, X.; Wu, J.; Jiang, Z.; Chen, J. (April 2007)."Structural parameters of Mayall II = G1 in M31".Monthly Notices of the Royal Astronomical Society.376 (4):1621–1629.arXiv:astro-ph/0702012.Bibcode:2007MNRAS.376.1621M.doi:10.1111/j.1365-2966.2007.11573.x.S2CID 3591548.
^^a ^badmin (2021-01-31)."Mayall II".Messier Objects. Retrieved2024-05-10.
^Meylan, G.; Sarajedini, A.; Jablonka, P.; Djorgovski, S. G.; Bridges, T.; Rich, R. M. (August 2001). "Mayall II=G1 in M31: Giant Globular Cluster or Core of a Dwarf Elliptical Galaxy?".The Astronomical Journal.122 (2):830–841.arXiv:astro-ph/0105013.Bibcode:2001AJ....122..830M.doi:10.1086/321166.S2CID 17778865.

External links

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v t e Andromeda Galaxy
Location	Andromeda Galaxy → Andromeda subgroup →Local Group →Local Sheet →Local Volume →Virgo Supercluster →Laniakea Supercluster →Pisces–Cetus Supercluster Complex →Local Hole →Observable universe →Universe Each → may be read as "within" or "part of".	Andromeda Galaxy
Satellite galaxies	M32 M110 NGC 185 NGC 147 Andromeda I Andromeda II Andromeda III Andromeda IV* Andromeda V Andromeda VI Andromeda VII Andromeda VIII Andromeda IX Andromeda X Andromeda XI Andromeda XII Andromeda XIII Andromeda XIV Andromeda XV Andromeda XVI Andromeda XVII Andromeda XVIII Andromeda XIX Andromeda XX Andromeda XXI Andromeda XXII Andromeda XXIII Andromeda XXIV Andromeda XXV Andromeda XXVI Andromeda XXVII Andromeda XXVIII Andromeda XXIX Triangulum subgroup* *It is uncertain whether these are companion galaxies of the Andromeda Galaxy
Catalogued stars	AE Andromedae AF Andromedae M31-RV
Other	Andromeda–Milky Way collision S Andromedae Mayall II M32p NGC 206 3XMM J004232.1+411314
Category

Constellation of Andromeda

Stars

Bayer	α (Alpheratz) β (Mirach) γ (Almach) δ ε ζ (Shimu) η (Kui) θ ι (Rasalnaqa) κ (Kaffalmusalsala) λ (Udkadua) μ ν ξ (Adhil) ο (Alfarasalkamil) π ρ σ τ υ (Titawin) φ (Junnanmen) χ ψ ω
Flamsteed	2 3 4 5 6 7 (Honores) 8 9 10 11 12 13 14 (Veritate) 15 18 22 23 26 28 32 36 39 41 44 45 47 49 (A) 51 (Nembus) 55 56 58 59 60 (b) 62 (c) 63 64 65 66 6 Per
Variable	R T U W Z RT RV RX SU SW TU TW WZ XZ AB AC AD AE AF AR BM BX CC CG CN DS DX EG ET EU FF GO GP GQ GX GR GY HH HN IW KK KX KZ LL LN LP LQ OP OS OU PX PY QR QV QX V385 V428 V439 V455 V529 V807
HR	1 40 56 78 104 122 134 178 275 282 283 289 379 410 483 687 746 748 8884 8925 8950 8962 8973 9011 9074 9075 9105
HD	3765 16175 (Buna) 222155
Other	3XMM J004232.1+411314 ADS 48 Gliese 2 HAT-P-6 (Sterrennacht) HAT-P-16 HAT-P-19 HAT-P-28 M31-RV KELT-1 NGC 82 NGC 84 NGC 91 NGC 162 NGC 464 Qatar-3 Qatar-4 Qatar-5 PA-99-N2 WASP-1 WISE 0146+4234 WISE J0005+3737 WISE J004945.61+215120.0

Exoplanets	14 Andromedae b κ Andromedae b υ Andromedae b c d Gliese 15 Ab c HD 13931 b HD 16175 b HAT-P-6b HAT-P-32b WASP-1b WASP-33b Qatar-4b Qatar-5b

Star
clusters

NGC	206 272 752 956 7686
Other	Mayall II RBC EXT8

Nebulae

NGC	7662

Galaxies

Messier	Andromeda Galaxy 32 110
NGC	11 13 19 20 21 27 39 43 48 49 51 67 68 69 70 71 72 74 76 79 80 81 83 85 86 90 93 94 96 97 108 109 112 140 149 160 169 181 183 184 214 218 226 228 229 233 243 252 258 260 262 280 304 317 389 393 404 425 431 477 512 513 523 528 531 536 542 561 605 620 668 679 687 700 703 704 705 708 709 710 712 714 717 721 732 753 759 801 812 834 891 906 910 911 912 913 920 937 980 995 996 999 1000 7640 7836
Numbered	I II III IV V VIII IX X XI XVIII XIX XXI
Other	3C 66A 3C 66B Arp 273 Donatiello I IC 239 IERS B0125+487 QSO B0133+476 UGC 1840

Galaxy clusters	Abell 262 NGC 68 group

Astronomical events	GRB 101225A SN 1885A (S)

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Origin of names

See also

References

External links