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Messier object
Plot of declination vs right ascension of the Messier objects relative to the modern constellations, ecliptic and Milky Way The Messier objects are a set of astronomical objects first listed by French astronomer Charles Messier in 1771. Messier was a comet hunter, and was frustrated by objects which resembled but were not comets, so he compiled a list of them, in collaboration with his assistant Pierre Méchain, to avoid wasting time on them.A similar list had been published in 1654 by Giovanni Hodierna, but had no impact and was probably not known to Messier. ^ "Charles Messier's Catalog of Nebulae and Star Clusters". SEDS. 12 August 2011. Retrieved 2014-05-17.  ^ "The Messier Catalog". SEDS Messier Database. SEDS. 25 February 2008. Retrieved 2010-05-08.  ^ Birthday of a star cluster, Astronomy Now, January 2011, page 20.
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