sponsored by psychohistorian.org
RA: 14h 29m 48s
Dec: −60° 43′ 0″
Ch: MSA:985, U2:430, SA:25
Ref: SIMBAD, Collinder (1931), DAML02, Archinal&Hynes (2003)
Type: open cluster, 13r
Mag: B=7, V=6.3
Select a sketch and click the button to view
James Dunlop discovered this cluster while observing from Paramatta, New South Wales, and included it as No. 302 in his catalogue of 1827. Using a 9-inch f/12 telescope, he described it as "A cluster of small stars of mixt mags, considerably congregated towards the centre, 4' or 5' diameter."
Observed by John Herschel at the Cape of Good Hope with an 18-inch f/13 speculum telescope. He recorded it as a "Class VI object, very rich; irregularly round; pretty much compressed in the middle, but scattered at borders; 15'; there are three stars of 10th mag, 5 or 6 of 11th mag; the rest below 11th mag." On a second occassion he called it a "cluster of Class VII; irregular figure; not much compressed in the middle; large; 10' diameter. There are perhaps 100 stars, 11th and 11..12th mag; with a good sprinkling of 12 and 13." His final observation recorded it as "large, pretty rich, irregular cluster of scattered stars of 8..14th mag; fill field." The NGC description reads "large, pretty rich, pretty compressed in the middle, stars of 8th mag and fainter."
Trumpler (Lick Obs Bul, Vol 14, No. 420) gives the diameter as 14' and the class as 1 2 r.
Raab, S. (1922) A research on open clusters. Lund Medd. Astron. Obs. Ser. II, 28, 1.
Discussed, based of F-A plates.
"Cat. of Open Cl. south of -45° Decl.", Mem. 17 Mnt Stromlo Obs.
A catalogue of star clusters shown on Franklin-Adams chart plates. Mem.R.A.S., 60(5), 175-186.
"cluster, fairly condensed."
Bailey, S.I. (1908) A catalogue of bright stars and nebulae. Ann.Harv.Coll.Obs., 60(8), 199.
Moffat, AFJ & Vogt. N. (1975) "Southern Open Star Clusters VI. UBV-H-beta Photometry of 18 Clusters from Centaurus to Sagittarius." Astron.Astrophys.Suppl., 20, 155-182. [image, table]
d = 1.34 kpc.
"A Catalogue of Estimated Parallaxes of 112 Nebulae, Open clusters and Star Groups", Vol 36 (4), p 107-115.
"loose; bright stars at centre." He gives the approx. diameter as 20 arcmin.
Burnham calls this open cluster in Centaurus large, pretty rich, pretty compressed in the middle, about 50 stars of 8th mag and fainter. Lies 80' west of Alpha Centauri. Also known as Collinder 282, Trumpler described this cluster as detached from the background starfield, strongly concentrated toward the centre, large range in brightness, rich in stars. Its 80 or so stars occupy a 10' region, the brightest star is mag 10.0 and the combined mag is 6.3.
The RNGC (Sulentic and Tifft 1973) notes that this is a 8.5 mag open cluster.
Hartung calls it a "fine open cluster about 15' across with some central condensation, in a rich and beautiful region; it is well shown by 10.5cm."
Bennett observed it with a 5-inch short-focus refractor, including it in his list of cometary objects as number 65. His coded description describes it as an irregular extended object which can be resolved into stars with a higher magnification.
15cm - mod lg/br cl well concen twd center. 140x: 15' diam w/120 *s m10.5+. 3'
core w/25 *s incl sev mod interesting pairs. BS, 24Feb1990, LCO.
8-inch Newtonian, 66x: 1995-06-19 "A group of faint stars (10) surrounded by various brighter ones (9) that I believe do not form part of the cluster. I consider it of class II with a concentration to the centre. It seems that there are two groups of stars in terms of brightness. The brighter are pictured in the sketch, over a whitish background that I could not resolve. Medium richness." [Gabriel Giust, San Isidro, Argentina]
This small sprinkling of stars lies close to Alpha Centauri, only 80' west, and in a two-inch refractor at 25x, the glare from Alpha Cen is irritating. Averted vision shows quite a number of cluster members sparkling out, with the main concentration of stars seeming to lie in a bar extending north-south. Due south of the cluster lies a narrow diamond of roughly 9th mag stars, shown on the Uranometria 2000.0 charts.
1994-01-19: 11x80's, The Boord, 02:00 SAST Easily seen as an irregular patch, with a narrow diamond of stars attached.
1995-05-28: 11x80.Technopark. 20:15 SAST. Hazy sky, thin clouds. Between Alpha and Beta Centauri. Binoculars show an irregular scattering of dim stars, individually too faint to be seen, forming a rough glowing patch. Not at all comet-like.
1997 Sept 03: 11x80 tripod-mounted. 23:00 SAST. Jonkershoek. Irregular milky patch, in a very rich field, of which it seems to be a part. Rating: Easy.
Location: Camp Site: ( South 23 16 East 29 26 )
Sky conditions: clear fair about 6 magnitude.
Instrument: 8 inch Meade ( super wide-angle 18 mm. Eyepiece ).
Date: April 1997.
An excellent example of a packed, large roundish open cluster. Brighter to the middle with stars forming a (straight?) line running out to the east in a medium to rich starfield.
Meade 8-inch, 25mm, 18mm wide angle & 15mm eyepieces
Date: 14 February 1999. (Gert en Mary op die plaas 14 Februarie 1999)
Open Cluster, Centaurus, 14h 29m 8s, -60 43
Reasonably bright, poor, narrow, shapeless cluster, with stars tightly concentrated in the centre. On opposite side, two starchains extends outwards into the field (from the north and south). The cluster appears like a stretched-out, narrow band of reasonably bright stars with a tight compact middle.
12-inch f/10 SCT (EP: 2-inch 32mm SW 95x 42' fov; 2-inch 14mm UW 218x 23' fov)
Reasonably large, shapeless, delicate and bright open cluster, rich in stars. Gives the impression of an outstretched speckled band north to south with bright stars running out in lines and circles away from a packed core. A small patch of faint stars grouped in the south east of the field of view is probably an extension (95x). Two star strings are prominent ľone in the north, the other one displays a short string of about 6 faint stars in a line pointed south (218x). Very impressive, and share a very busy star field.
Sky Conditions:The fainter parts of the Milky Way are barely visible.Haziness only visible on the horizon.Atmosphere stable with little interference.
NGC 5617 is a well detached compact cluster in which I have counted 160 stars in a fixed diameter and that this object has bright and faint stars being mixed together.This open clusters stars are arranged in a north-south direction and that this objects stars are in the magnitude range of 9.2 to 10.1.This open cluster measures 8.5'x 6'.
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.