Celestial hemisphere:  Northern  ·  Constellation: Andromeda (And)
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Mayall II, G1 and Mayall III, G2 - Andromeda's Globular Clusters, Mau_Bard

Mayall II, G1 and Mayall III, G2 - Andromeda's Globular Clusters

Getting plate-solving status, please wait...
Mayall II, G1 and Mayall III, G2 - Andromeda's Globular Clusters, Mau_Bard

Mayall II, G1 and Mayall III, G2 - Andromeda's Globular Clusters

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Description

I exposed this target in RGB at beginning October 2021. I was curious to catch the globular cluster of a different galaxy than ours. Only later I realized that a second Andromeda Globular Cluster, Mayall III,  is included in the field.
1000mm focal is too short for this target, and probably shorter subs would have lead to a better result. Technical advice is welcome and would be highly appreciated!

I attach here a short excerpt from Wikipedia describing Mayall II.

Mayall II is a globular cluster orbiting M31, the Andromeda Galaxy, also known as NGC-224-G1, SKHB 1, GSC 2788:2139, HBK 0-1, M31GC J003247+393440.

It is located 130,000 light-years (40 kpc) from the Andromeda Galaxy's galactic core, and is the brightest (by absolute magnitude) globular cluster in the Local Group, having 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 (∼ 2×10^4 M⊙) black hole.

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.
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 remnant of a dwarf galaxy consumed by Andromeda.

Distance 2.52 ± 0.14 Mly (770 ± 40 kpc)
Apparent magnitude (V)    +13.81
Physical characteristics
Mass    1×10^7 M☉
Radius    21.2 ± 1.0 ly (6.5 ± 0.3 pc)
Estimated age    ~ 12 Gyr

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