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The 4U 1820-30 system, consisting of a neutron star and a white dwarf, compared to the Earth and the Sun (bottom). The neutron star is tied with PSR J1748−2446ad as the fastest rotating pulsar known, both making 716 revolutions per second.
The globular cluster was discovered in 1784 by the astronomer William Herschel with his 18.7-inch telescope and the discovery was later catalogued in the New General Catalogue. It is located 1.5 degrees south-southeast of Gamma 2 Sagittarii.
NGC 6603 is an open cluster discovered by John Herschel on July 15, 1830 [2] located in Sagittarius constellation. [3]Situated within the brightest part of star cloud Messier 24, it is classified by Shapley as type "g".
NGC 6633 is a large bright open cluster in the constellation Ophiuchus.Discovered in 1745-46 by Philippe Loys de Chéseaux, it was independently rediscovered by Caroline Herschel in 1783 and included in her brother William's catalog as H VIII.72. [1]
NGC 6621 is an interacting spiral galaxy in the constellation Draco.It lies at a distance of about 260 million light-years. NGC 6621 interacts with NGC 6622, with their closest approach having taken place about 100 million years ago. [4]
Messier 18 or M18, also designated NGC 6613 and sometimes known as the Black Swan Cluster, is an open cluster of stars in the constellation Sagittarius. It was discovered by Charles Messier in 1764 and included in his list of comet -like objects. [ 8 ]
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