sponsored by psychohistorian.org
Type: globular cluster
Mag: B=9.7, V=?
Select a sketch and click the button to view
Dunlop, J. (1828) A Catalogue of Nebulae and Clusters of Stars in the Southern Hemisphere, Observed at Paramatta in New South Wales. Phil. Trans. Roy. Soc., 118, 113-151. [1828RSPT..118..113D]
James Dunlop discovered this object from Paramatta, New South Wales, and included it as No. 236 in his catalogue of 1827. Using a 9-inch f/12 telescope, he described it as "a small nebula, 20 arcseconds diameter, with a very bright point in the centre." He observed it twice.
John Herschel recorded it as "Globular cluster, B, rich, compact, vm compressed." On a second occassion he called it "vB, S, R cluster of distinct stars, mbM, 2' diameter." It was next recorded as "vB, R, gmbM, 0.5', has several small stars near it." His fourth observation was recorded as "globular cluster, vB, L, R, gpmbM, 100 arcseconds, resolved. I see the stars." His next entry reads: "vB, R, psmbM, 2' diameter, resolved. The stars well seen." The final description reads: "globular cluster, vB, S, R, vmbM, resolved, has several outliers."
"globular cluster of few stars, fairly condensed; LMC."
Bailey, S.I. (1908) A catalogue of bright stars and nebulae. Ann.Harv.Coll.Obs., 60(8), 199.
Doig, P. (1925) Notes on the nebulae and clusters in Webb's 'Celestial Objects for Common Telescopes' (Sixth edition, Vol.ii). Part V. M.N.R.A.S., 36(3), 89.
Shapley and Lindsay ("A Catalogue of Clusters in the Large Magellanic Cloud", Irish Astronomical Journal, Vol. 6, 1963) give a diameter of 2.5' and remark "very bright condensed centre, outer resolved."
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 9.85. They classify it as an open cluster.
The RNGC (Sulentic and Tifft 1973) notes that this is a 10.0 mag open cluster in the LMC.
Photo Index by Jim Lucyk: Sky&Tel. 2/61 p74.
ASV Journal Vol 24 No 3 June 1971: "remote and small."
15cm - mod br cl part res @ 80x. 195x: 1'.2 diam, reaching as far as m12.5 * E. strong even concen w/20 *s countable plus strong clumpy haze. BS, 11Nov1993, LCO.
- nice br cl part res @ 80x. 195x: m12.5 * on E edge defines boundary. 2' diam w/mod sharp concen from vf hazy halo up to starry core. *s m13.5+, about two doz. BS, 12Nov1993, LCO.
12-inch f/10 SCT (95x 218x)
The cluster displays a very dense unresolved knot with fainter members barely seen in high power. Spot the very faint glow of the unresolved cluster.
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 1818 mag 9 size 3
Resembles a globular look, small, bright, round, brighter to the middle. Just a few small stars to the edges.
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)
Positioned in the centre of the LMC, resembling a globular, small, bright, round and with a compact middle, rather impressive. Quite a few stars of varying size are located outside around the edge of the cluster (218x). Short star strings within the outer regions of the cluster. Numerous clusters and nebulae appear within this area.
Sky Conditions:The fainter parts of the Milky Way are barely visible.Haziness only visible on the horizon.Atmosphere stable with little interference.
This cluster is well detached as an irregular compact cluster whereby there are bright and faint stars being mixed.This open cluster consists of 12th magnitude stars which are slightly concentrated towards each other.This open cluster measures 8.2'x 6.3'.
The Messier objects
The Bennett objects
The Caldwell list
DOCdb is still in beta-release.
Known issues, feature requests, and updates on bug fixes, are here:
Found a bug? Have a comment or suggestion to improve DOCdb? Please let us know!
DOCdb is a free online resource that exists to promote deep sky observing.
You could help by sharing your observations, writing an article, digitizing and proof-reading historical material, and more.
Everything on DOCdb.net is © 2004-2010 by Auke Slotegraaf, unless stated otherwise or if you can prove you have divine permission to use it. Before using material published here, please consult the Creative Commons Attribution-Non-Commercial-Share Alike 2.5 License. Some material on DOCdb is copyright the individual authors. If in doubt, don't reproduce. And that goes for having children, too. Please note that the recommended browser for DOCdb is Firefox 3.x. You may also get good results with K-Meleon. Good luck if you're using IE. A successful experience with other browsers, including Opera and Safari, may vary.