NGC 6633
| NGC 6633 | |
|---|---|
 Open cluster NGC 6633 | |
| Observation data (J2000.0epoch) | |
| Right ascension | 18h27.7m |
| Declination | 6° 34′ |
| Distance | 1.04kly |
| Apparent magnitude(V) | 4.6 |
| Apparent dimensions (V) | 27′ |
| Physical characteristics | |
| Estimated age | 660 million years |
| Other designations | NGC 6633, De Cheseaux No. 3 H VIII.72,Cr380,Mel201 |
| Associations | |
| Constellation | Ophiuchus |
NGC 6633is a large brightopen clusterin the constellationOphiuchus.Discovered in 1745-46 byPhilippe Loys de Chéseaux,it was independently rediscovered byCaroline Herschelin 1783 and included in her brotherWilliam's catalog as H VIII.72.[1]Bright enough to be seen with the naked eye, the cluster is considered a fine object for binoculars or small telescopes.[2]
NGC 6633 is also known as the Tweedledum Cluster (paired withIC 4756as Tweedledee), also as the Captain Hook Cluster and the Wasp Cluster.[3]It is also designatedCollinder380 orMelotte201. Nearly as large as the full moon, the cluster contains 38 known stars[4]and shines with a total magnitude of 4.6; the brightest star is of mag 7.6. Its age has been estimated at 660 million years.[1]
The cluster contains at least one chemically peculiar star - NGC 6633 48 (BD+06 3755).[4]
The 8th-magnitude binary star HD 169959 (NGC 6633 58) is within the line-of-sight of the open cluster but is not physically associated with it.[4]
References
[edit]- ^ab"NGC 6633".messier.seds.org.Archivedfrom the original on 2021-01-18.Retrieved2020-10-05.
- ^Michael Bakich."Open cluster NGC 6633, a complex of dark nebulae, and globular cluster M54".astronomy.com.Archivedfrom the original on 2020-09-20.Retrieved2020-10-05.
- ^O'Meara, Stephen James (2007).Deep-Sky Companions: Hidden Treasures.Cambridge University Press. pp. 457–458.ISBN978-0521-83704-0.
- ^abcPaunzen, E.; Netopil, M.; Maitzen, H. M.; Pavlovski, K.; Schnell, A.; Zejda, M. (2014), "Photoelectric search for peculiar stars in open clusters",Astronomy & Astrophysics,564:A42,arXiv:1403.3538,doi:10.1051/0004-6361/201423521,S2CID119174151
External links
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Media related toNGC 6633at Wikimedia Commons- NGC 6633 onWikiSky:DSS2,SDSS,GALEX,IRAS,Hydrogen α,X-Ray,Astrophoto,Sky Map,Articles and images
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