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NGC 6633 information


NGC 6633
Open cluster NGC 6633
Observation data (J2000.0 epoch)
Right ascension18h 27.7m
Declination6° 34
Distance1.04 kly
Apparent magnitude (V)4.6
Apparent dimensions (V)27
Physical characteristics
Estimated age660 million years
Other designationsNGC 6633, De Cheseaux No. 3
H VIII.72, Cr 380, Mel 201
Associations
ConstellationOphiuchus
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)
  1. ^ a b "NGC 6633". messier.seds.org. Archived from the original on 2021-01-18. Retrieved 2020-10-05.
  2. ^ 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.
  3. ^ O'Meara, Stephen James (2007). Deep-Sky Companions: Hidden Treasures. Cambridge University Press. pp. 457–458. ISBN 978-0521-83704-0.
  4. ^ a b c Paunzen, 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

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NGC 6633

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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...

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Ophiuchus

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Willem Blaeu Ophiuchus contains several star clusters, such as IC 4665, NGC 6633, M9, M10, M12, M14, M19, M62, and M107, as well as the nebula IC 4603-4604...

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IC 4756

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telescopes. IC 4756 is also known as the Tweedledee Cluster (paired with NGC 6633 as Tweedledum), also as the Secret Garden Cluster. Metallicity of IC 4756...

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List of open clusters

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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...

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Messier 50

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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", Astronomy & Astrophysics...

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Extrasolar Planet Search: methods and first results from a field centred on NGC 6633". Monthly Notices of the Royal Astronomical Society. 360 (2): 703–717....

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Messier 35

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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", Astronomy & Astrophysics...

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Melotte catalogue

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2020-06-26. "ngc 1857". sim-id. Retrieved 2020-06-26. "ngc 2192". sim-id. Retrieved 2020-06-26. "ngc 2215". sim-id. Retrieved 2020-06-26. "ngc 2243". sim-id...

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Collinder catalogue

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Embedded within Messier 24. Associated with Messier 17. Associated with NGC 6820. Embedded within the Iris Nebula. There are some errors in Collinder's...

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Herschel 400 Catalogue

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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...

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NGC 6818

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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...

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NGC 2539

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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...

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NGC 6509

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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...

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NGC 6782

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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...

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Black hole

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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...

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Ammonia

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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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