Messier 25
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| AladinLite | |
| Constellation | Sagittarius |
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Position equinox : J2000.0 |
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|---|---|
| Right ascension | 18 h 31 m 47 s |
| declination | −19 ° 07 ′ 00 ″ |
| Appearance
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| classification | I, 2, p (Trumpler), d (Shapley) |
| Brightness (visual) | 4.6 likes |
| Brightness (B-band) | 5.29 likes |
| Angular expansion | 32 ' |
| Variable stars | U Sgr |
| Physical data
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| Redshift | −6 · 10 −6 |
| Radial velocity | −1.81 km / s |
| distance | 2100 ly (650 pc ) |
| diameter | 19 ly |
| Age | 90 million years |
| history | |
| Discovered by | Chéseaux |
| Discovery time | 1745 |
| Catalog names | |
| M 25 • IC 4725 • C 1828-192 • Mel 204 • Cr 382 • Lund 839 • ESO 591-SC6 • | |
Messier 25 (M25, also known as IC 4725 ) is one of the five brightest open star clusters in the summer constellation Sagittarius (Sagittarius). It has a brightness of +4.6 mag and an angular extent of 32 '.
A few degrees to the west - almost in the center of the Milky Way - lies the small Sagittarius cloud (M24) and the star cluster Messier 23, which is comparable to M25 .
See also: Messier catalog
Individual evidence
Attention: The sorting key "Messier 025" overwrites the previously used key "IC4725".