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RA: 16h 59m 6s
Dec: −52° 43′ 0″
Ch: MSA:1497, U2:433, SA:26
Ref: SIMBAD, Collinder (1931), DAML02, Archinal&Hynes (2003)
Type: open cluster, 21m
Mag: B=?, V=10.2
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Sir John Herschel notes that this object may be Dunlop 374, which was observed by James Dunlop from Paramatta, New South Wales, and included in his catalogue of 1827. Using a 9-inch f/12 telescope, Dunlop described it as "a very faint nebula, of an irregular round figure, about 2' diameter, slightly bright towards the centre, easily resolvable into very minute stars, slightly compressed to the centre; this also precedes Epsilon Arae."
Observed by Herschel at the Cape of Good Hope with an 18-inch f/13 speculum telescope. He recorded it only as "a small triangular cluster, 2' diameter, stars of 13th magnitude."
Raab, S. (1922) A research on open clusters. Lund Medd. Astron. Obs. Ser. II, 28, 1.
Discussed, based of F-A plates.
"Cat. of Open Cl. south of -45° Decl.", Mem. 17 Mnt Stromlo Obs.
Trumpler (Lick Obs Bul, Vol 14, No. 420) gives the diameter as 5' and the class as 1 2 m.
The RNGC (Sulentic and Tifft 1973) notes that this is a 10.0 mag open cluster.
Burnham calls it a fairly well compressed, compact cluster of about 70 stars 13th mag and fainter. The cluster lies near the red Epsilon Arae and is a challenge in 11x80 binoculars, which isn't surprising since the brightest stars are 13th magnitude, and the cluster has an overall magnitude of 10.
A catalogue of star clusters shown on Franklin-Adams chart plates. Mem.R.A.S., 60(5), 175-186.
10x50 tripod-mounted, 1997-05-02 (clear skies, no light pollution on horizon, dew on binocs): nothing visible
1998-05-25/26, 6-inch f/8.6 Newtonian, Jonkershoek (exurban). Lim mag 6.2 naked eye; seeing good; dew!
Just north of epsilon Areae. Evident in the sweeper as a large, faint spray of dim light erupting out of a 9.5mag star.
This very rich, 3.5' cluster is generally triangular in shape and has a 9.5 mag star close southwest. The grouping is quite well separated from the background and at 144x is resolved into a host of tiny stars. About half a dozen are held directly, many others glimpsed; two stars on the southern side are much brighter, giving this grouping a modest brightness range.
1997 April 05, 01:00 SAST, Coetzenburg, 11x80 tripod-mounted binoculars. Seen as an extended glow, fanning away from a 9th mag star attached to the west.
12-inch f/10 SCT (EP: 2-inch 32mm SW 95x 42' fov; 2-inch 14mm UW 218x 23' fov)
Large, rich grouping of faint stars in an elongated cone shape spraying away from east to west. To the west and close to the rim of the cup-shaped opening, is a bright 9th magnitude star. Faint stars lead the way from this tri-angle point show the way to an unusual orange-yellow star embedded. The northern part of the cluster is slightly bulge. Although a faint attractive cluster, it does stand out against the background star-field. Knowing Jenni Kay just on e-mail but consider her a close friend it strongly reminds me of an Australia Kangaroo, not that I ever see one in my life. Bright stars descending from south of this cone, lead the way further south to epsilon Arae. About 30 stars resolved.
Location:Night Sky Caravan Park, Bonnievale.
Sky Conditions:Whole Milky is visible.The sky is clear.
Atmosphere stable with little interference.
This open cluster is well detached with bright stars which are nearly the same brightness as each other in this cluster.In this cluster the stars are strongly concentrated towards each other.In this cluster I have counted 30 stars lying 27'north of the orange 4.1 magnitude star Epsilon-1 Arae. Around the outskirts of this cluster there are some starless patches in between. This open cluster measures 6.2'*3.1'.Chart:No.23,NSOG Vol.3.
The Messier objects
The Bennett objects
The Caldwell list
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