Mayall II

File:Mayall II (HST-Judy Schmidt-JPG).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)| +13.81[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 rh) 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 as NGC-224-G1, SKHB 1, GSC 2788:2139, HBK 0-1, M31GC J003247+393440 or Andromeda's Cluster, is a globular cluster orbiting M31, the Andromeda Galaxy.

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

It was first identified as a possible globular cluster by American astronomers Nicholas Mayall and Olin J. Eggen in 1953 using a Palomar 48-inch (1.2 m) Schmidt plate exposed in 1948.[3]

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.[3][5]

## Contents

* 1 Origin of names
* 2 See also
* 3 References
* 4 External links

## Origin of names

* Mayall II is named after Nicholas U. Mayall, who, with Olin J. Eggen, discovered it in 1953.
* SKHB 1 is named for Wallace L. W. Sargent, Charles T. Kowal, F. D. A. Hartwick and Sidney van den Bergh. They also named it G1 in 1977.
* HBK 0-1 is named for John Huchra, J. P. Brodie and S. M. Kent in 1991.[4]

## See also

* Messier 54
* Omega Centauri
* Mayall's Object

## References

1. ↑ 1.0 1.1 1.2 1.3 "NAME Mayall II". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NAME+Mayall+II.
2. ↑ 2.0 2.1 Ma, Jun; de Grijs, Richard; Fan, Zhou; Rey, Soo-Chang; Wu, Zhen-Yu; Zhou, Xu; Wu, Jiang-Hua; Jiang, Zhao-Ji et al. (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. doi:10.1088/1674-4527/9/6/003. Bibcode: 2009RAA.....9..641M.
3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 Ma, J.; de Grijs, R.; Chen, D.; van den Bergh, S.; Fan, Z.; Wu, Z.; Wu, H.; Zhou, X. et al. (April 2007). "Structural parameters of Mayall II = G1 in M31". Monthly Notices of the Royal Astronomical Society 376 (4): 1621–1629. doi:10.1111/j.1365-2966.2007.11573.x. Bibcode: 2007MNRAS.376.1621M.
4. ↑ 4.0 4.1 admin (2021-01-31). "Mayall II" (in en-US). https://www.messier-objects.com/mayall-ii/.
5. ↑ 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. doi:10.1086/321166. Bibcode: 2001AJ....122..830M.

## 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
* NightSkyInfo.com: Mayall II

* v
* t
* e

Andromeda Galaxy

Location|

Andromeda Galaxy → Andromeda subgroup → Local Group → Local Sheet → Virgo Supercluster → Laniakea Supercluster → 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 Galaxy*

*It is uncertain whether it is a companion galaxy of the Andromeda Galaxy

Catalogued stars|

* AE Andromedae
* M31-RV

Other|

* Andromeda–Milky Way collision
* S Andromedae
* Mayall II
* M32p
* NGC 206
* 3XMM J004232.1+411314

* Category

* v
* t
* e

Constellation of Andromeda

* Adhil
* Andromeda in Chinese astronomy
* List of Andromeda's satellite galaxies
* List of stars in Andromeda

Stars|

| Bayer|

* α
* β
* γ
* δ
* ε
* ζ
* η
* θ
* ι
* κ
* λ
* μ
* ν
* ξ
* ο
* π
* ρ
* σ
* τ
* υ
* φ
* χ
* ψ
* ω

|

Flamsteed|

* 2
* 3
* 4
* 5
* 6
* 7
* 8
* 9
* 10
* 11
* 12
* 13
* 14
* 15
* 18
* 22
* 23
* 26
* 28
* 32
* 36
* 39
* 41
* 44
* 45
* 47
* 49
* 51
* 55
* 56
* 58
* 59
* 60
* 62
* 63
* 64
* 65
* 66

Variable|

* R
* T
* U
* W
* Z
* RT
* RU
* RV
* RX
* SU
* SW
* TU
* TW
* WZ
* XZ
* AB
* AC
* AD
* AE
* AR
* BM
* BX
* CC
* CN
* DS
* DX
* EG
* ET
* EU
* FF
* GP
* GR
* GY
* HN
* KK
* KX
* KZ
* LL
* LP
* LQ
* OP
* OS
* OU
* PX
* QR
* QV
* QX
* V385
* V455
* V529

HD|

* 3
* 166
* 895
* 1185
* 1606
* 2421
* 2767
* 2942
* 3322
* 3346
* 4778
* 5608
* 5789/5788
* 6114
* 7853
* 8673
* 10307
* 13931
* 14622
* 15082
* 16004
* 16028
* 16175
* 217811
* 220105
* 221246
* 221776
* 222109
* 222399
* 223229
* 224365
* 224801
* 225218

Other|

* 3XMM J004232.1+411314
* 6 Persei
* ADS 48
* Groombridge 34
* HAT-P-6
* HR 178
* HR 8768
* M31-RV
* NGC 44
* NGC 82
* NGC 84
* NGC 91
* NGC 162
* NGC 464
* PA-99-N2
* Ross 248
* WASP-1
* WISE 0146+4234
* WISE J0005+3737
* WISE J004945.61+215120.0

| Exoplanets|

* 14 Andromedae b
* Upsilon Andromedae b
* c
* d
* e
* Gliese 15 Ab
* HD 13931 b
* HD 16175 b
* HAT-P-6b
* HAT-P-32b
* WASP-1b
* WASP-33b

|

| Star clusters|

* Mayall II
* NGC 206
* NGC 272
* NGC 752
* NGC 956
* NGC 7686

|

| Nebulae|

* NGC 7662

|

Galaxies|

| NGC|

* 5
* 11
* 13
* 19
* 21
* 20
* 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
* 478
* 512
* 513
* 523
* 528
* 536
* 668
* 679
* 687
* 700
* 703
* 704
* 705
* 708
* 709
* 710
* 712
* 714
* 717
* 732
* 753
* 759
* 891
* 1000
* 7640
* 7836

|

Numbered|

* I
* II
* III
* IV
* V
* VIII
* IX
* X
* XI
* XVIII
* XIX
* XXI

Other|

* 3C 66A
* 3C 66B
* Andromeda Galaxy
* Donatiello I
* Messier 32
* Messier 110

| Galaxy clusters|

* Abell 262
* NGC 68 group

|

| Astronomical events|

* GRB 101225A
* SN 1885A

|

Category

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