IC 4665
Appearance
IC 4665 | |
---|---|
![]() Cluster IC 4665 with star Beta Ophiuchi below | |
Observation data (J2000 epoch) | |
Right ascension | 17h 46m 18s[1] |
Declination | +05° 43′ 00″[1] |
Distance | 1.12 kly (343.6 pc[2]) |
Apparent magnitude (V) | 4.2[1] |
Apparent dimensions (V) | 45′ × 45′ |
Physical characteristics | |
Estimated age | 55 ± 3 Myr[2] |
Other designations | Cr 349, Mel 179 [1] |
Associations | |
Constellation | Ophiuchus |
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 about 55 million years ago, and lies about 1,100 light years away from Earth.[2] 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.
References
[edit]- ^ a b c d "SIMBAD Astronomical Database". Results for NGC 6369. Retrieved 2007-04-17.
- ^ a b c Jeffries, R. D.; Jackson, R. J.; Binks, A. S. (2023). "A revised age greater than 50 Myr for the young cluster IC 4665". Monthly Notices of the Royal Astronomical Society. 526: 1260–1267. arXiv:2309.07619. Bibcode:2023MNRAS.526.1260J. doi:10.1093/mnras/stad2845.
External links
[edit]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