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NGC 6633 is a large bright open cluster in the constellation Ophiuchus. Discovered in 1745-46 by Philippe Loys de Chéseaux, it was independently rediscovered by Caroline Herschel in 1783 and included in her brother William'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 | |
|---|---|
 NGC 6633 (Stellarium image) (Roberto Mura) | |
| Observation data (J2000.0 epoch) | |
| Constellation | Ophiuchus |
| Right ascension | 18h 27.7m |
| Declination | 6° 34′ |
| Distance | 1.04 kly |
| 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, Cr 380, Mel 201 |
NGC 6633 is also known as the Tweedledum Cluster (paired with IC 4756 as Tweedledee), also as the Captain Hook Cluster.[3] It is also designated Collinder 380 or Melotte 201. 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
- "NGC 6633". messier.seds.org. Retrieved 2020-10-05.
- Michael Bakich. "Open cluster NGC 6633, a complex of dark nebulae, and globular cluster M54". astronomy.com. Retrieved 2020-10-05.
- O'Meara, Stephen James (2007). Deep-Sky Companions: Hidden Treasures. Cambridge University Press. pp. 457–458. ISBN 978-0521-83704-0.
- Photoelectric search for peculiar stars in open clusters. XV. Feinstein 1, NGC 2168, NGC 2323, NGC 2437, NGC 2547, NGC 4103, NGC 6025, NGC 6633, Stock 2, and Trumpler 2, 2014, arXiv:1403.3538
External links
Media related to NGC 6633 at Wikimedia Commons- NGC 6633 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
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На других языках
[de] NGC 6633
NGC 6633 ist ein Offener Sternhaufen vom Trumpler-Typ III2m im Sternbild Schlangenträger auf der Ekliptik. Er hat eine Helligkeit von 4,6 mag und einen Winkeldurchmesser von 20 Bogenminuten. Der Haufen ist rund 1.000 Lichtjahre vom Sonnensystem entfernt und hat einen Durchmesser von etwa 8 Lichtjahren. Er beinhaltet knapp 30 Sterne, sein Alter wird auf 600 - 700 Millionen Jahre geschätzt.- [en] NGC 6633
[ru] NGC 6633
NGC 6633 (другое обозначение — OCL 90) — рассеянное скопление в созвездии Змееносец.Другой контент может иметь иную лицензию. Перед использованием материалов сайта WikiSort.org внимательно изучите правила лицензирования конкретных элементов наполнения сайта.
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