sponsored by psychohistorian.org
RA: 17h 17m 58.5s
Dec: −39° 26′ 32″
Ch: MSA:1459, U2:408, SA:22
Ref: SIMBAD, Collinder (1931), DAML02, Archinal&Hynes (2003)
Type: open cluster, 31m
Mag: B=?, V=11.8
Select a sketch and click the button to view
James Dunlop discovered this object from Paramatta, New South Wales, and included it as No. 522 in his catalogue of 1827. Using a 9-inch f/12 telescope, he described it as "an exceddingly faint nebula, about 1.5' long and 1' broad, elliptical in the direction of the meridian, with two or three very small stars in it."
Observed by Sir John Herschel at the Cape of Good Hope with an 18-inch f/13 speculum telescope. He recorded it as "cluster VII class. Rich, pL, R, gbM, stars 12..14th mag, not a globular."
Trumpler (Lick Obs Bul, Vol 14, No. 420) gives the diameter as 5' and the class as 2 2 m.
Raab, S. (1922) A research on open clusters. Lund Medd. Astron. Obs. Ser. II, 28, 1.
Discussed, based of F-A plates.
The RNGC (Sulentic and Tifft 1973) notes that this is a 12.0 mag open cluster.
A catalogue of star clusters shown on Franklin-Adams chart plates. Mem.R.A.S., 60(5), 175-186.
Steve Coe, observing with a 17.5" f/4.5 at 100X, notes: "Pretty faint, pretty small, pretty rich, somewhat elongated, not much at 100X.
Jonkershoek. 11x80 tripod mounted. No moon. Scarecely imaginable faint glow, like a globular cluster.
Location: Campsite (South 23 16 East 29 26).
Sky conditions: Very clear semi transparent.
Instrument: Meade 8" (Super plossl 26mm and wide-angle 18mm eyepiece).
Date: 26 to 28 April 1998.
Field of view: 36.2arc minutes.
Truly faint, large grouping of about 50 stars in a very much roundish shape. The brighter stars scattered out to the edges with the fainter stars in the middle. Low surface brightness.
12-inch f/10 SCT (EP: 2-inch 32mm SW 95x 42' fov; 2-inch 14mm UW 218x 23' fov)
Approximately 50 faint stars in a reasonably wide grouping. The cluster divides into three sections with the larger and fainter group in the north. The other two patches position along one another to the west and east barely stand out against the field of view. Appears flimsy and separated from one another deep within the Milky Way section of the sky.
Location:Night Sky Caravan Park,Bonnievale.
Sky Conditions:Whole Milky Way is visible.The sky is clean.Atmosphere stable with little interference.
The stars in this cluster are well detached.In this cluster I have found that most of the stars are nearly the same brightness as each other.The stars are strongly concentrated towards each other in this cluster. This cluster consists of 11th magnitude stars being seen in this open cluster.Around some of the bright stars in this cluster there are some starless patches.This open cluster measures 8.1'*4.1'.Chart No:345,NSOG Vol.2.
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.