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. The cluster is located near some obscuring features, with a dark lane passing near the center.
M25 is at a distance of about away from Earth and is 67.6 million years old. The spatial dimension of this cluster is about across. It has an estimated mass of , of which about 24% is interstellar matter. A Delta Cephei type variable star designated U Sagittarii is a member of this cluster, as are two red giants, one of which is a binary system.
See also
List of Messier objects
References
External links
Messier 25, The Messier Catalog. Students for the Exploration and Development of Space (SEDS)
Open Cluster M25. Astronomy Picture of the Day 2009 August 31
Messier 025
Orion–Cygnus Arm
Messier 025
025
IC objects
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