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RA: 16h 34m 6s
Dec: −44° 03′ 0″
Ch: MSA:1461, U2:407, SA:22
Ref: SIMBAD, Collinder (1931), DAML02, Archinal&Hynes (2003)
Type: open cluster, 31m
Mag: B=?, V=6.6
This cluster (also known as the Mu Normae Cluster) is a member of the Ara OB 1 Association.
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."
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."
The RNGC (Sulentic and Tifft 1973) notes that this is a 5.5 mag open cluster.
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.
The Messier objects
The Bennett objects
The Caldwell list
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