Messier number

Messier number

See Messier Catalog.

Messier number

[me′syā ‚nəm·bər]
(astronomy)
A number by which star clusters and nebulae are listed in Messier's catalog; for example, the Andromeda Galaxy is M 31.
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References in periodicals archive ?
Upper left of M8 is a small but rich Milky Way star cloud that received its own Messier number, M24.
In June, during the dark-Moon period from about the 5th to 19th, Pluto is seen against some of the richest Milky Way fields in the sky, a star cloud so bright that it gained its own Messier number, M24.
Charts more detailed than our all-sky map show seven galaxies bearing Messier numbers in a 5[degrees]-long line.
Camelopardalis contains NGC 2403, one of the brightest galaxies in the northern celestial hemisphere that don't have Messier numbers.