Messier Index/M25
Open Cluster M25 (also known as Messier Object 25 or IC 4725) is an w:open cluster in the w:constellation Sagittarius. It was discovered by w:Philippe Loys de Chéseaux in w:1745 and included in w:Charles Messier's list in w:1764.
| 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′ |
| Other designations | IC 4725 |
M25 is at a distance of about 2,000 w:light-years away from w:Earth. The spatial dimension of this cluster is about 19 w:light years across. A Delta Cephei type w:variable star designated U Sagittarii is a member of this cluster.