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Type: globular cluster
Mag: B=9.98, V=9.73
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John Herschel recorded it as "vB, L, R, vgmbM, 2', resolvable."
"! globular cluster, extremely condensed, partially resolved; LMC."
Bailey, S.I. (1908) A catalogue of bright stars and nebulae. Ann.Harv.Coll.Obs., 60(8), 199.
Harvard Circular 271, "The Magellanic Clouds, IV."
(p.5) "The positions and angular diameters are given in Harvard Bulletin 775 for seven clusters in the Large Magellanic Cloud. Their apparent magnitudes measured on a special small scale photograph, Bo 907, are as follows:"
NGC 1651, 12.0 mp
NGC 1783, 8.0 mp
NGC 1806, 10.4 mp
NGC 1831, 8.3 mp
NGC 1846, 8.9 mp
NGC 1866, 7.2 mp
NGC 1978, 10.3 mp
"The first and sixth objects in the list are not certainly globular clusters; the dispresion on the best Harvard photographs with the Bruce telescope is hardly sufficient to decide that the first is not a nebula and that the sixth is not a nebulous open cluster. For the other five, which appear to be typical globular clusters, the mean apparent photographic magnitude is 9.2, corresponding to the absolute photographic magnitude -8.5."
The RNGC (Sulentic and Tifft 1973) notes that this is a 10.0 mag open cluster in the LMC.
Van den Bergh and Hagen ("UBV photometry of star clusters in the Magellanic Clouds", Astronomical Journal, Vol. 73, 1968) find that the integrated V magnitude through a 60'' diaphragm is 9.89. They remark that through a 42'' diaphragm V = 10.26. They classify it as an open cluster.
Shapley and Lindsay ("A Catalogue of Clusters in the Large Magellanic Cloud", Irish Astronomical Journal, Vol. 6, 1963) give a diameter of 5.1' and remark "very condensed centre, outer well resolved."
Harvard College Obs. Circ., No 271. "The Magellanic Clouds, IV. The Absolute Magnitudes of Nebulae, Clusters, and Peculiar Stars in the Large Cloud."
Mentioned. Also gives integrated apparent magnitude.
Photo Index by Jim Lucyk: Sky&Tel. 2/61 p72, Sky&Tel. 7/69 p25, Sky&Tel. 9/70 p135.
ASV Journal Vol 24 No 3 June 1971: "easy in 4-inch 64x."
15cm - br grainy cl @ 80x. 195x: just barely res, 2'.25 diam w/strong
even-broad concen. BS, 11Nov1993, LCO.
12-inch f/10 SCT (EP: 2-inch 40mm SW 76x 53' fov; 2-inch 32mm SW 95x 42' fov; 2-inch 14mm UW 218x 23' fov)
Small and densely packed, round blob of light. Displays a barely brighter middle, with a few faint stars on the outskirts (218x). It seems that the northeast side has a few extensions of faint stars (218x). Very bare star field. Discovered by Sir John Herschel.
Location: Pietersburg South 23o 53. East 29o 28.
Sky conditions: Clear.
Date: 4 Julie 1997.
Field of view: 52.7 arc minutes.
ASSA-DSO - Report J
NGC 1866 mag 9 size 5.
Small to medium, condensed packed, round plop of light. Little brighter to the middle with no stars visible. Bare starfield.
Sky Conditions:The fainter parts of the Milky Way are barely visible.Haziness only visible on the horizon.Atmosphere stable with little interference.
This open cluster is well detached as a large cluster with a bright central core which looks like an out of focus halo of pale white light.This open clusters stars are not at all concentrated and that this clusters stars are nearly as bright as each other.This cluster is well composed of 12th to 13th magnitude stars.This open cluster measures 14.2'x 10.9'.
The Messier objects
The Bennett objects
The Caldwell list
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