Messier 25

Messier 25
Messier 25
	Open cluster Messier 25 in Sagittarius
Observation data (J2000.0 epoch)
Right ascension	18h 31m 47.0s
Declination	−19° 07′ 00″
Distance	2,000 ly (620 pc)
Apparent magnitude (V)	4.6
Apparent dimensions (V)	36′
Physical characteristics
Mass	1,937 M☉ M☉
Radius	6.5 light-years
Estimated age	67.6 million years
Other designations	Messier 25, IC 4725, Cr 382, C 1828–192, Mel 204
Associations
	See also: Open cluster, List of open clusters

Messier 25, also known as IC 4725, is an open cluster of stars in the southern constellation of Sagittarius. The first recorded observation of this cluster was made by Philippe Loys de Chéseaux in 1745 and it was included in Charles Messier's list of nebulous objects in 1764.^[6] The cluster is located near some obscuring features, with a dark lane passing near the center.^[7]

M25 is at a distance of about 2,000 light-years away from Earth and is 67.6 million years old.^[2] The spatial dimension of this cluster is about 13 light-years across. It has an estimated mass of 1,937 M_☉, of which about 24% is interstellar matter.^[4] A Delta Cephei type variable star designated U Sagittarii is a member of this cluster,^[8] as are two red giants, one of which is a binary system.^[9]

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^ ^a ^b ^c ^d Cite error: The named reference kharchenko2005 was invoked but never defined (see the help page).
^ "Messier 25". SEDS Messier Catalog. Retrieved 21 July 2024.
^ ^a ^b ^c Cite error: The named reference Tadross2002 was invoked but never defined (see the help page).
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[3] "Messier 25". SEDS Messier Catalog. Retrieved 21 July 2024.

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