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Messier 25

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Title: Messier 25  
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Subject: List of Messier objects, Orion–Cygnus Arm, M25, 1745 in science, Messier 43
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Messier 25

Messier 25
Sketch of the cluster
Observation data (J2000.0 epoch)
Right ascension 18h 31.6m
Declination −19° 15′
Distance 2.0 kly (613 Pc)
Apparent magnitude (V) 4.6
Apparent dimensions (V) 32.0′
Physical characteristics
Radius 10
Estimated age 90 million years
Other designations IC 4725

Open Cluster M25 (also known as Messier Object 25 or IC 4725) is an open cluster in the constellation Sagittarius. It was discovered by Philippe Loys de Chéseaux in 1745 and included in Charles Messier's list in 1764.

M25 is at a distance of about 2,000 light-years away from Earth. The spatial dimension of this cluster is about 19 light years across. A Delta Cephei type variable star designated U Sagittarii is a member of this cluster.

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