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The first known globular cluster, now called M 22, was discovered in 1665 by Abraham Ihle, a German amateur astronomer. [4] [5] [6] The cluster Omega Centauri, easily visible in the southern sky with the naked eye, was known to ancient astronomers like Ptolemy as a star, but was reclassified as a nebula by Edmond Halley in 1677, [7] then finally as a globular cluster in the early 19th century ...
NGC 6355 is a globular cluster located in the constellation Ophiuchus. [5] ... It is a core-collapse cluster. [3] See also ... a non-profit organization.
The cluster contains around 400,000 stars, [8] and can be seen with the naked eye under good observing conditions. [ 10 ] NGC 6397 is one of at least 20 globular clusters of the Milky Way Galaxy that have undergone a core collapse , [ 8 ] meaning that the core has contracted to a very dense stellar agglomeration .
Messier 30 (also known as M30, NGC 7099, or the Jellyfish Cluster) is a globular cluster of stars in the southeast of the southern constellation of Capricornus, at about the declination of the Sun when the latter is at December solstice.
Messier 53 (also known as M53 or NGC 5024) is a globular cluster in the Coma Berenices constellation. [a] It was discovered by Johann Elert Bode in 1775.M53 is one of the more outlying globular clusters, being about 60,000 light-years (18.4 kpc) light-years away from the Galactic Center, and almost the same distance (about 58,000 light-years (17.9 kpc)) from the Solar System.
It is one of the most metal-poor globular clusters, which means it has a paucity of elements other than hydrogen and helium. The cluster may be undergoing core-collapse, and it displays signs of being in rotation. The cluster may have been acquired in its gravitational tie to the Milky Way through accretion from a satellite galaxy. [9]
The center of the cluster is fairly concentrated, but does not appear to have undergone a core collapse. [7] It has a core radius of 0.85 ly (0.26 pc), and a half-mass radius of 6.6 ly (2.02 pc). Observations suggest it is one of the most metal–rich globular clusters in the galaxy, and it is close to solar metallicity. [3]
NGC 6256 is a globular cluster of stars in the southern constellation of Scorpius.It was discovered by the Scottish astronomer James Dunlop on Aug 2, 1826. [6] In J. L. E. Dreyer's New General Catalogue annotation it is described as, "very faint, very large, very gradually bright in the middle, well resolved clearly consisting of stars."