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NGC 6281 (14,164 of 18,816)

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NGC 6281

NGC 6281, Dunlop 556, Cl Collinder 324, C 1701-378, Cl VDBH 213, COCD 392, h 3664, GC 4265

RA: 17h 04m 42s
Dec: −37° 59′ 0″

Con: Scorpius
Ch: MSA:1440, U2:376, SA:22

Ref: SIMBAD, Collinder (1931), DAML02, Archinal&Hynes (2003)

(reference key)

Type: open cluster, 22p

Mag: B=5.78, V=5.4

Size: 8′
PA: ?

Historical observations

Dunlop, James (1827)

James Dunlop discovered this object from Paramatta, New South Wales, and included it as No. 556 in his catalogue of 1827. Using a 9-inch f/12 telescope, he described it as "a curiously curved line of pretty bright small stars, with many very small stars mixt."

John Herschel (1847) Cape Observations

Discovered by Sir John Herschel at the Cape of Good Hope with an 18-inch f/13 speculum telescope. He recorded it as "a p rich, L, pB, cluster VII class, of loose stars 9, 10, 11th mag, which fills 2/3 of field."

NGC/IC Dreyer (1888, 1895, 1908)

The NGC description reads: "Open cluster, large, pretty rich, only slightly compressed, stars of magnitude 9..11."

Published comments

Trumpler, R.J. (1928)

Trumpler (Lick Obs Bul, Vol 14, No. 420) gives the diameter as 9' and the class as 2 2 p.

Sulentic & Tifft (1973)

The RNGC (Sulentic and Tifft 1973) notes that this is a 8.5 mag open cluster.

Photo index

Photo Index by Jim Lucyk: Burnhams V3 p1681.

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.

Bailey, S.I. (1908)

"cluster, coarse."

Bailey, S.I. (1908) A catalogue of bright stars and nebulae. Ann.Harv.Coll.Obs., 60(8), 199.

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

Harrington, Phil

Harrington calls this an "easy open cluster to glimpse with just about any optical aid. Binoculars reveal a tight swarm of 7-9th mag stars..." He likens it to "a crooked cross" and notes that Luginbuhl and Skiff describes it as "20 stars arranged over haze like Christamas tree lights." Harrington notes "as aperture and magnification increase, the cluster's structure appears to change as many fainter stars flood the field. An 8-inch telescope resolves about two dozen, while a 12-inch adds an additional dozen or so within the cluster's 8' diameter."

Tom Lorenzin

Tom Lorenzin, in the e-version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "5.4M; 9' diameter; rich, large and compressed; 25-plus 9 thru 11M members; 2.5 degrees E of DBL ST Mu SCO; good binocular object."

Steve Coe

Steve Coe, observing with a 17.5" f/4.5 at 100X, notes: "Pretty bright, pretty large, 30 stars in a nice Milky Way field at 100X. Several of the brighter members can be seen in the finderscope.

Contemporary observations

Kerneels Mulder

2008 October 31

Date and Time: 31 October 2008, 20:30
Location: Prince Albert (Western Cape, South Africa).
Instrument: Orion XT10 10" f/4.7 Dobsonian Reflector
Eyepieces: 10mm (120x, 26′ FOV), 25mm (48x, 1° FOV)
Sky Conditions: Clear. Seeing: 5/10. Transparency: Average
Windy, waxing crescent moon

48x: Small open cluster about 10′ in size. A definite arrow shape can be seen pointing in a slightly NW direction. One bright star is visible towards the west and 2 towards the NW. 34 stars counted using both direct and averted vision. Stars vary considerably in brightness, with fainter stars forming the arrow shape.

At 120x: The stars in the arrow shape is more visible and it is easier to make out the fainter stars in the surrounding area.

Auke Slotegraaf

2016 October 30, Sunday

Location: Night Sky Caravan Park, Bonnievale.

Date: 2016 Oct 30, Sunday.

Time: 21:10 SAST

Telescope: Little Martin (4-inch f/6.5 Celestron refractor)

19mm Panoptic (35x): Wow, gorgeous shape! A bright cluster with striking lines. Most obvious is a broad V (spanning the entire cluster) flying north-west, or perhaps it's a lobsided rectangle.

1981

This interesting open cluster looks like an elongated triangle with the apex separated from the main body. A 2-inch refractor shows one prominent member which appears double, and four or so smaller stars, the other members forming a mottled background.

1997 March 15

1997 March 15. Jonkershoek. 11x80 tripod mounted. No moon. Noticeable rectangular knot of large and small stars.

Favourite lists

Lacaille's catalogue

The Messier objects

Dunlop's catalogue

The Bennett objects

The Caldwell list

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