IC 4665 (Collinder 349 / Melotte 179) is an open cluster in the constellation Ophiuchus. It was discovered by Philippe Loys de Chéseaux in 1745. The cluster began to develop less than 40 million years ago, and lies about 1,400 light years away from Earth. It is easily visible in the smallest of telescopes and also with binoculars. From a sufficiently dark place it is also visible to the naked eye. It is one of the brightest clusters not to be cataloged by Charles Messier or William Herschel, probably because it is so loose and coarse.

IC 4665
Observation data (J2000 epoch)
Constellation	Ophiuchus
Right ascension	17h 46m 18s[1]
Declination	+05° 43′ 00″[1]
Distance	1.4 kly (352 pc)
Apparent magnitude (V)	4.2[1]
Apparent dimensions (V)	45′x45′
Physical characteristics
Other designations	Cr 349, Mel 179 [1]
See also: Open cluster, List of open clusters

References

External links

• Media related to IC 4665 at Wikimedia Commons
• IC 4665 @ SEDS IC objects pages
• IC 4665 www.univie.ac.at
• IC 4665 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
• X-Ray Activity in the Open Cluster IC 4665 National Aeronautics and Space Administration

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