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The Lagoon Nebula (catalogued as Messier 8 or M8, NGC 6523, Sharpless 25, RCW 146, and Gum 72) is a giant interstellar cloud in the constellation Sagittarius.It is classified as an emission nebula and has an H II region.
NGC 6530 is a young [8] open cluster of stars in the southern constellation of Sagittarius, located some 4,300 light years from the Sun. [3] It exists within the H II region known as the Lagoon Nebula, or Messier 8, [9] and spans an angular diameter of 14.0′. [5]
Messier's final catalogue was included in the Connaissance des Temps pour l'Année 1784 [Knowledge of the Times for the Year 1784], the French official yearly publication of astronomical ephemerides. [8] [4] Messier lived and did his astronomical work at the Hôtel de Cluny (now the Musée national du Moyen Âge), in Paris, France.
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Messier 83 or M83, also known as the Southern Pinwheel Galaxy and NGC 5236, is a barred spiral galaxy [7] approximately 15 million light-years away in the constellation borders of Hydra and Centaurus. Nicolas-Louis de Lacaille discovered M83 on 17 February 1752 at the Cape of Good Hope. [8]
Messier 78 or M78, also known as NGC 2068, is a reflection nebula in the constellation Orion. It was discovered by Pierre Méchain in 1780 and included by Charles Messier in his catalog of comet-like objects that same year. [4] M78 is the brightest diffuse reflection nebula of a group of nebulae that includes NGC 2064, NGC 2067 and NGC 2071.
Messier 16, NGC 6611, [1] Sharpless 49, RCW 165, Cr 375, Gum 83, Star Queen Nebula See also: Lists of nebulae The Eagle Nebula (catalogued as Messier 16 or M16 , and as NGC 6611 , and also known as the Star Queen Nebula ) is a young open cluster of stars in the constellation Serpens , discovered by Jean-Philippe de Cheseaux in 1745–46.
Messier 81 (also known as NGC 3031 or Bode's Galaxy) is a grand design spiral galaxy about 12 million light-years away in the constellation Ursa Major. It has a D 25 isophotal diameter of 29.44 kiloparsecs (96,000 light-years ).