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NGC 6031 (13,507 of 18,816)

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NGC 6031

NGC 6031, Dunlop 359, C 1603-539, Cl Collinder 297, Cl VDBH 183, Ocl 951, h 3618, GC 4155

RA: 16h 07m 51.4s
Dec: −54° 03′ 3″

Con: Norma
Ch: MSA:1498, U2:432, SA:26

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

(reference key)

Type: open cluster, 13p

Mag: B=8.92, V=8.5

Size: 3′
PA: ?

Historical observations

Dunlop, James (1827)

James Dunlop discovered this object from Paramatta, New South Wales, and included it as No. 359 in his catalogue of 1827. Using a 9-inch f/12 telescope, he described it as "three very minute stars forming a triangle, with a faint round nebula, about 20 arcseconds diameter in the centre, but none of the stars are involved in the nebula."

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, a small, compact knot of stars 11..14th mag, in a magnificently full field and zone."

Published comments

Hogg, A.R. (1965)

"Cat. of Open Cl. south of -45° Decl.", Mem. 17 Mnt Stromlo Obs.

Moffat, A.F.J. & Vogt. N. (1975)

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]

"From the clear cluster sequence we derive .. d = 1.09 kpc."

Trumpler, R.J. (1928)

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

Sulentic & Tifft (1973)

The RNGC (Sulentic and Tifft 1973) notes that this is a 12.0 mag open cluster.

Modern observations

Brian Skiff

15cm - fairly f & poor cl btwn two m11.5-12 *s. 140x: fourteen *s in 1'.5

area, mostly m13.5+. BS, 27Feb1990, LCO.

Contemporary observations

Auke Slotegraaf

1998 April 27

1998-04-27/28, 11x80 tripod-mounted binoculars, Die Boord. Seeing average, transparency average, dew. "Maybe a little spot. But nothing, really."

1994 March 15

1994-03-15 Die Boord, 6-inch f/8.6 Newtonian, seeing good. In a rich field, this small cluster appears as a sharp triangle defined by three 10th mag stars, with many faint stars scattered about. Overall, small, faint, triangular.

Magda Streicher

29 April 2009

OPEN CLUSTER

RA: 16h07m36s - DEC: -54o01'00" - Magnitude: 8.5 - Size: 3'

Tel: 16" S/C - 290x - Date: 29 April 2009 Polokwane Vis 5.2+-

This grouping shows a triangle in its outline. The inside area show the smallest, faintest half moon stars ever seen through my telescope. Around a dozen stars can be seen. 290x.

(no date)

Alldays (22.50S, 20.12E, 770m).

12-inch f/10 SCT (76x, 218x)

NGC 6031 can be seen 50 arc minutes to the east of glorious NGC 6067. In contrast a very small dainty grouping with more or less 15 faint members that vary between 11 and 13 magnitude. Although faint it is still outstanding against the background star field. The four core stars are installed in the form of a trapezium along with fainter members to share the field. Faint stars company this cluster to the south form the shape of a smoker's pipe, or rather in my minds eye. Visit this lovely small grouping and share my imagination. I came across a few bright sparkling stars about 55 arc minutes to the west of NGC 6031, but with a difference (Streicher DSH). Don't let this unique one get away. It is one of these very small groupings that you always will remember! It reminds me of an aeroplane, tight grouping with lot of character.

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