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Messier 15 or M15 (also designated NGC 7078 and sometimes known as the Great Pegasus Cluster) is a globular cluster in the constellation Pegasus. It was discovered by Jean-Dominique Maraldi in 1746 and included in Charles Messier 's catalogue of comet -like objects in 1764.
A central massive object (CMO) is a high mass object or cluster of objects at the centre of a large star system, such as a galaxy or globular cluster.In the case of the former, the CMO may be a supermassive black hole, a nuclear star cluster, or even both together.
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NGC 6397 (also known as Caldwell 86) is a globular cluster in the constellation Ara that was discovered by French astronomer Nicolas-Louis de Lacaille in 1752. [9] It is located about 7,800 light-years from Earth, [3] making it one of the two nearest globular clusters to Earth (the other one being Messier 4).
Messier 52 or M52, also known as NGC 7654 or the Scorpion Cluster, is an open cluster of stars in the highly northern constellation of Cassiopeia. It was discovered by Charles Messier in 1774. [ 3 ] [ a ] It can be seen from Earth under a good night sky with binoculars .
Messier 93 or M93, also known as NGC 2447 or the Critter Cluster, is an open cluster in the modestly southern constellation Puppis, the imagined poop deck of the legendary Argo. Observational history and appearance
The cluster is about 16,400 light-years (5,000 parsecs) [3] from Earth and has a spatial diameter of about 75 light-years. The brightest stars of M12 are of 12th magnitude . M10 and M12 are only a few thousand light-years away from each other and each cluster would appear at about magnitude 4.5 from the other. [ 10 ]
Core collapse can refer to: The collapse of the stellar core of a massive star, such as the core collapse that produces a supernova Core collapse (cluster) , the dynamic process that leads to a concentration of stars at the core of a globular cluster