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RA: 15h 27m 26.6s
Dec: −54° 32′ 4″
Ch: MSA:968, U2:431, SA:25
Ref: SIMBAD, Collinder (1931), DAML02, Archinal&Hynes (2003)
Type: open cluster, 32r
Mag: B=?, V=8.4
James Dunlop discovered this object from Paramatta, New South Wales, and included it as No. 357 in his catalogue of 1827. Using a 9-inch f/12 telescope, he described it as "a very extensive cluster of stars of mixed small magnitudes; the stars appear to be either congregating together in different parts of the cluster, or breaking up; there are several groups already formed, the whole cluster is composed of lines of stars, but no general attraction towards any particular point."
Observed by Sir John Herschel at the Cape of Good Hope with an 18-inch f/13 speculum telescope. He recorded it as "a remarkable cluster, 20' diameter, R, very discrete, and composed of small groups of 2, 3, 4 stars, chielfy 11, 12 and 13th mag, sufficiently insulated from the rest of the pretty rich neighbourhood to be considered a cluster." On a second occassion he called it "a most numerous and beautiful milky way group or cluster covering a space of 1.5 or 2 fields diameter (20' or 30') entirely composed of double and triple stars, and distinct groups of 4 or 5 nearly of a size (10th and 11th mag) on a black ground. Perhaps 100 or 150 stars in field." His third observation was recorded as "Cluster VIII class. The field uniformly covered with insulted stars 11..14th mag, forming a rich cluster of 8th class, remarkable for the total darkness of he ground and absence of minute stars. Cluster much more than fills the field."
Trumpler (Lick Obs Bul, Vol 14, No. 420) gives the diameter as 20' and the class as 3 2 m.
The RNGC (Sulentic and Tifft 1973) notes that this is a 8.5 mag open cluster.
Journal BAA, 36(3), Dec, p91
L Ri cluster with little condensation.
"Cat. of Open Cl. south of -45° Decl.", Mem. 17 Mnt Stromlo Obs.
15cm - lg loose grp of *s, poss an abs hole. lies at N edge of naked-eye dk
cloud extending E from nr alpha Cen and north of Norma *cloud. anyway,
30' diam w/at least 75 *s @ 80x. dk areas rel free of f fld *s S and in
dk lane NW of cl. good @ 50x. BS, 26Feb1990, LCO.
Tel: 16" S/C - 290x - Date: 29 April 2009 – Polokwane – Vis 5.2+-
Very difficult to discern this cluster, it blend in with the star field, but closer investigation brings to the fore two small groups of stars in random round shape. Does not at all shows a busy center. A lot of the stars seem to share in pairs.
The Messier objects
The Bennett objects
The Caldwell list
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