Messier 18

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Coordinates: Sky map 18h 19m 54s, −17° 07′ 60″

Messier 18
The star cluster Messier 18 and its surroundings.jpg
Star cluster Messier 18 and its surroundings, taken by y the OmegaCAM.[1]
Observation data (J2000.0 epoch)
Right ascension 18h 19.9m
Declination −17° 08′
Distance 4.9 kly (1.5 kPc)
Apparent magnitude (V) 7.5
Apparent dimensions (V) 9.0′
Physical characteristics
Radius 9 ly
Estimated age 32 million years
Other designations NGC 6613
See also: Open cluster, List of open clusters

Messier 18 or M18 (also designated NGC 6613) is an open cluster of stars in the constellation Sagittarius. It was discovered by Charles Messier in 1764 and included in his list of comet-like objects. From the perspective of Earth, M18 is situated between the Omega Nebula (M17) and the Sagittarius Star Cloud (M24). Its age is estimated at 32 million years. It is 4,900 light-years away.


External links[edit]


  1. ^ "Stellar Lab in Sagittarius". Retrieved 11 August 2016.