NGC 6633, De Cheseaux No. 3 H VIII.72, Cr 380, Mel 201
Associations
Constellation
Ophiuchus
See also: Open cluster, List of open clusters
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 is also known as the Tweedledum Cluster (paired with IC 4756 as Tweedledee), also as the Captain Hook Cluster and the Wasp 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]
Map showing location of NGC 6633 (Roberto Mura)
^ ab"NGC 6633". messier.seds.org. Archived from the original on 2021-01-18. Retrieved 2020-10-05.
^Michael Bakich. "Open cluster NGC 6633, a complex of dark nebulae, and globular cluster M54". astronomy.com. Archived from the original on 2020-09-20. 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.
^ 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, S2CID 119174151
NGC6633 is a large bright open cluster in the constellation Ophiuchus. Discovered in 1745-46 by Philippe Loys de Chéseaux, it was independently rediscovered...
Willem Blaeu Ophiuchus contains several star clusters, such as IC 4665, NGC6633, M9, M10, M12, M14, M19, M62, and M107, as well as the nebula IC 4603-4604...
telescopes. IC 4756 is also known as the Tweedledee Cluster (paired with NGC6633 as Tweedledum), also as the Secret Garden Cluster. Metallicity of IC 4756...
photometric search for peculiar stars in open clusters. V. NGC 2099, NGC 3114, NGC 6204, NGC 6705 and NGC 6756". Astronomy and Astrophysics. 412 (3): 721–725...
Extrasolar Planet Search: methods and first results from a field centred on NGC6633". Monthly Notices of the Royal Astronomical Society. 360 (2): 703–717....
stars in open clusters. XV. Feinstein 1, NGC 2168, NGC 2323, NGC 2437, NGC 2547, NGC 4103, NGC 6025, NGC6633, Stock 2, and Trumpler 2", Astronomy & Astrophysics...
stars in open clusters. XV. Feinstein 1, NGC 2168, NGC 2323, NGC 2437, NGC 2547, NGC 4103, NGC 6025, NGC6633, Stock 2, and Trumpler 2", Astronomy & Astrophysics...
Binarity and stellar evolution in five Hyades-generation clusters : NGC 2447, 2539, 2632, 6633 and 6940". Astronomy and Astrophysics. 219: 125–141. Bibcode:1989A&A...
II Program. The catalogue contains 400 objects. All objects are from the NGC. All objects are visible in mid northern latitudes, since they were all observed...
The Little Gem Nebula or NGC 6818 is a planetary nebula located in the constellation of Sagittarius. It has magnitude 10 and oval diameter of 15 to 22...
Embedded within Messier 24. Associated with Messier 17. Associated with NGC 6820. Embedded within the Iris Nebula. There are some errors in Collinder's...
NGC 6782 is a barred spiral galaxy located in the southern constellation of Pavo, at a distance of approximately 173 megalight-years from the Milky Way...
NGC 6509 is a galaxy in the New General Catalogue. It is located in the constellation Ophiuchus. It is a Sc type spiral galaxy. Simbad Astronomical Database...
hole candidates include the Andromeda Galaxy, M32, M87, NGC 3115, NGC 3377, NGC 4258, NGC 4889, NGC 1277, OJ 287, APM 08279+5255 and the Sombrero Galaxy...
of ammonia by nitrogen reduction and hydrogen oxidation". Science. 379 (6633): 707–712. doi:10.1126/science.adf4403. Roth, Karl S. "eMedicine Specialties...
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