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Messier 2 or M2 (also designated NGC 7089) is a globular cluster in the constellation Aquarius, five degrees north of the star Beta Aquarii. It was discovered by Jean-Dominique Maraldi in 1746, and is one of the largest known globular clusters.
41 Aquarii is a double star [3] in the equatorial constellation of Aquarius. 41 Aquarii is its Flamsteed designation.It is visible to the naked eye as a dim, orange-hued point of light with a combined apparent visual magnitude of 5.354. [2]
[2] A preliminary version of the catalogue first appeared in 1774 in the Memoirs of the French Academy of Sciences for the year 1771. [3] [4] [5] The first version of Messier's catalogue contained 45 objects, which were not numbered. Eighteen of the objects were discovered by Messier; the rest had been previously observed by other astronomers. [6]
Abel (globular star clusters) Abell — Abell catalogue; Abetti — Giorgio Abetti (double stars) Abt — (for example: open star cluster Abt 1 = Biurakan 4 = Markarian 6 = Stock 7) (at 2:29.6 / +60°39' near the southwestern section of the Heart Nebula in Cassiopeia) AC — Astrographic Catalogue; A.C. — Alvan Clark (double stars)
91 Aquarii is a triple star system. [7] The primary component, 91 Aqr A, is a giant star with a stellar classification of K1 III. [3] This is an evolved star with 138% of the Sun's mass that has expanded to over 10 times the size of the Sun. [3] It is radiating 54 [3] times the Sun's luminosity from its outer envelope at an effective temperature of 4,730 K. [3] This gives it the orange-hued ...
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HD 222582 is a multiple star system in the equatorial constellation of Aquarius.It is invisible to the naked eye with an apparent visual magnitude of 7.7, [2] but can be viewed with binoculars or a small telescope. [12]
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