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NGC 6169 (13,811 of 18,816)

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mu Normae Cluster

NGC 6169, Cl Collinder 306, C 1630-439, Ocl 984, mu Normae Cluster, h 3636, GC 4210

RA: 16h 34m 6s
Dec: −44° 03′ 0″

Con: Scorpius
Ch: MSA:1461, U2:407, SA:22

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

(reference key)

Type: open cluster, 31m

Mag: B=?, V=6.6

Size: 12′
PA: ?

Remarks

This cluster (also known as the Mu Normae Cluster) is a member of the Ara OB 1 Association.

Historical observations

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 "cluster, place of a star Mu Normae in it."

Published comments

Vogt, N. & Moffat, A.F.J. (1972/3)

Vogt. N. & Moffat, AFJ (1973), "Southern Open Star Clusters III." Astron.Astrophys.Suppl., 10, 135-193. [image, table]

"According to the Catalogue of Star Clusters and Associations this cluster has a diameter of 7' and is centred on the bright super-giant mu Nor. However, there is no obvious clustering here. To check this, three stars close to mu Nor were observed which show no genetic relation to one another or to mu Nor."

Sulentic & Tifft (1973)

The RNGC (Sulentic and Tifft 1973) notes that this is a 5.5 mag open cluster.

Contemporary observations

Auke Slotegraaf

1984

From this information it would appear as if the cluster is easy to spot. However, it is not visible in 11x80 binoculars under urban skies, and even a 15.5-inch could only show one or two stars near Mu using averted vision at magnifications up to 650x.

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