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RA: 16h 24m 36s
Dec: −51° 58′ 0″
Ch: MSA:1498, U2:432, SA:22
Ref: SIMBAD, DAML02, Archinal&Hynes (2003)
Type: open cluster, 12p
Mag: B=10.29, V=9.8
Discovered by Sir John Herschel at the Cape of Good Hope with an 18-inch f/13 speculum telescope. He recorded it as "a part of the milky way, so immensely rich as to be one cast cluster of clusters."
The RNGC (Sulentic and Tifft 1973) notes that this is a nonexistent object. Their coded description reads NOCL) S.
Vogt. N. & Moffat, AFJ (1973), "Southern Open Star Clusters III." Astron.Astrophys.Suppl., 10, 135-193. [image, table]
"Assuming five of the observed stars to be members of a group .. we derive d = 1.34 kpc, earliest Sp = B8 .These parameters are very tentative. The reality of the cluster is somewhat doubtful."
Observing with a 6-inch f/8.6 Newtonian on 24/05/93 at 52x & 72x, this cluster shows as a ghostly sheen of nebulous light to the east of Ru 116. One star in the cluster, near the western edge, can be seen -- it is 11..12th mag. The rest of the cluster is an unresolved nebulous glow, extended east-west. It was not easily seen, and lost at 144x.
Ru 116 and Ru 118 forms a very nice contrasting pair, just like the binocular view of M46 & M47 or NGC 2477 & NGC 2451.
Alldays (22.50S, 20.12E, 770m).
12-inch f/10 SCT (76x, 218x)
Start again with Gamma and draw an imaginary line 2o right south east to discover a feast of clusters. The centre of attention is NGC 6115 that displays a rich scattering of faint stars accompany three Ruprecht clusters in a very busy star field. Try to sort out this bundle of joy is quite a challenge. They all mingle well with each other in the northern fringes of the rich Norma cloud. Round splash of faint stars, next to Ruprecht 118 to its east. Field very busy to the SE. Ruprecht 116 seen as a faint gathering of stars about 6' to the SW seen easier.
The Messier objects
The Bennett objects
The Caldwell list
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