sponsored by psychohistorian.org
RA: 17h 34m 48s
Dec: −32° 34′ 0″
Ch: MSA:1416, U2:376, SA:22
Ref: SIMBAD, Collinder (1931), DAML02, Archinal&Hynes (2003)
Type: open cluster, 23mn
Mag: B=5.56, V=5.5
NGC 6383 = NGC 6374, which see.
This scattered open cluster lies just over a degree WSW of M6. The brightest star is the unequal double star h4962, component magnitudes 5.5 and 10.5 and separation 5.5"
Discovered by Sir John Herschel at the Cape of Good Hope with an 18-inch f/13 speculum telescope. He recorded it as "a star 7th mag witha cluster of stars 12m assembled about it. the great star occupies the centre. A very remarkable object." On a second occassion he called it "A curious cluster consisting of one large star 6-7m and some 15 or 20 small ones 13m clustering close around it."
Bailey, examining a Bruce plate (Harvard Annals, Vol 72, No 2), describes it as "Milky Way, coarse cluster, involving HR 6535, mag 5.71."
(Lick Obs Bul, Vol 14, No. 420) gives the diameter as 5.5' and the class as 2 3 p.
The RNGC (Sulentic and Tifft 1973) notes that this is a 5.5 mag open cluster.
Coe, observing with a 17.5" f/4.5 at 100X, notes: "Pretty bright, pretty large, irregular, 18 stars counted at 100X. The cluster surrounds the double star h 4962, it is split at 100X with white and blue colors.
Hartung describes the cluster as follows: "A bright yellow star with two faint companions [h4962] lies in a small star cluster about 3' across, the whole bearing a striking resemblance to 30 CMa in NGC 2362, but neither so vivid nor so rich. The field is fine and both of the companions are visible with four-inch telescope."
The Messier objects
The Bennett objects
The Caldwell list
DOCdb is still in beta-release.
Known issues, feature requests, and updates on bug fixes, are here:
Found a bug? Have a comment or suggestion to improve DOCdb? Please let us know!
DOCdb is a free online resource that exists to promote deep sky observing.
You could help by sharing your observations, writing an article, digitizing and proof-reading historical material, and more.
Everything on DOCdb.net is © 2004-2010 by Auke Slotegraaf, unless stated otherwise or if you can prove you have divine permission to use it. Before using material published here, please consult the Creative Commons Attribution-Non-Commercial-Share Alike 2.5 License. Some material on DOCdb is copyright the individual authors. If in doubt, don't reproduce. And that goes for having children, too. Please note that the recommended browser for DOCdb is Firefox 3.x. You may also get good results with K-Meleon. Good luck if you're using IE. A successful experience with other browsers, including Opera and Safari, may vary.