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The Messier catalogue is one of the most famous lists of astronomical objects, and many objects on the list are still referenced by their Messier numbers. [1] The catalogue includes most of the astronomical deep-sky objects that can be easily observed from Earth's Northern Hemisphere; many Messier objects are popular targets for amateur ...
The Messier catalogue: the Messier objects are a set of astronomical objects first listed by French astronomer Charles Messier in 1771. Nebulae and Star Clusters was published in 1781, with objects M1–M110. The New General Catalogue or NGC, compiled in the 1880s by J. L. E. Dreyer, lists objects NGC 0001 – NGC 7840. It is one of the largest ...
The list was compiled by Patrick Moore as a complement to the Messier catalogue. [1] While the Messier catalogue is used by amateur astronomers as a list of deep-sky objects for observation, Moore noted that Messier's list was not compiled for that purpose and excluded many of the sky's brightest deep-sky objects, [1] such as the Hyades, the ...
See also: Globular cluster, List of globular clusters Messier 107 or M107 , also known as NGC 6171 or the Crucifix Cluster , is a very loose globular cluster in a very mildly southern part of the sky close to the equator in Ophiuchus , and is the last such object in the Messier Catalogue .
Messier 34 (also known as M34, NGC 1039, or the Spiral Cluster) is a large and relatively near open cluster in Perseus. It was probably discovered by Giovanni Batista Hodierna before 1654 [ 4 ] and included by Charles Messier in his catalog of comet -like objects in 1764.
The Butterfly Cluster (cataloged as Messier 6 or M6, and as NGC 6405) is an open cluster of stars in the southern constellation of Scorpius. Its name derives from the resemblance of its shape to a butterfly. [5] The first astronomer to record the Butterfly Cluster's existence was Giovanni Battista Hodierna in 1654. [6]
The cluster is positioned near the Trifid nebula (NGC 6514), but is not associated with that nebulosity. [8] It forms part of the Sagittarius OB1 association. [9] This cluster is located 1,205 pc [2] away from Earth with an extinction of 0.87. [10] Messier 21 is around 6.6 million years old with a mass of 783.4 M ☉. [5]
The cluster was independently re-discovered by Guillaume Le Gentil in 1749, then Charles Messier observed it in 1764 and added it to his catalogue. [6] It is about 1,330 pc (4,340 light years) away from Earth. [1] The cluster is very similar to the Pleiades cluster , and if as far away it would be of similar apparent magnitude. [7]