Messier 18
Coordinates: 
18h 19m 54s, −17° 07′ 60″
| Messier 18 | |
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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 |
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.
Gallery
M18 photo from the 2MASS project
Map showing location of M18 (Roberto Mura)
External links
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Wikimedia Commons has media related to Messier 18. |
- Messier 18, SEDS Messier pages
- Messier 18 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
References
- ↑ "Stellar Lab in Sagittarius". www.eso.org. Retrieved 11 August 2016.
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This article is issued from Wikipedia - version of the 8/11/2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.