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NGC 6318
NGC 6318, Dunlop 522, Cl Collinder 325, C 1714-394, Bennett 91a, h 3672, GC 4280
RA: 17h 17m 58.5s
Dec: −39° 26′ 32″
Con: Scorpius
Ch: MSA:1459, U2:408, SA:22
Ref: SIMBAD, Collinder (1931), DAML02, Archinal&Hynes (2003)
Type: open cluster, 31m
Mag: B=?, V=11.8
Size: 4′
PA: ?
Image gallery
Sketches (1)
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Historical observations
Dunlop, James (1827)
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."
John Herschel (1847) Cape Observations
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."
Published comments
Trumpler, R.J. (1928)
Trumpler (Lick Obs Bul, Vol 14, No. 420) gives the diameter as 5' and the class as 2 2 m.
Raab, S. (1922)
Raab, S. (1922) A research on open clusters. Lund Medd. Astron. Obs. Ser. II, 28, 1.
Discussed, based of F-A plates.
Sulentic & Tifft (1973)
The RNGC (Sulentic and Tifft 1973) notes that this is a 12.0 mag open cluster.
Melotte, P.J. (1915)
A catalogue of star clusters shown on Franklin-Adams chart plates. Mem.R.A.S., 60(5), 175-186.
Modern observations
Steve Coe
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.
Contemporary observations
Auke Slotegraaf
1997 March 15
Jonkershoek. 11x80 tripod mounted. No moon. Scarecely imaginable faint glow, like a globular cluster.
Magda Streicher
1998 April 27
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.
(no date)
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.
Richard Ford
2012 September, 14th
Location:Night Sky Caravan Park,Bonnievale.
Sky Conditions:Whole Milky Way is visible.The sky is clean.Atmosphere stable with little interference.
Instrument:12-inch Dobsonian.
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.
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Favourite lists
Lacaille's catalogue
The Messier objects
Dunlop's catalogue
The Bennett objects
The Caldwell list
Named DSOs
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