sponsored by psychohistorian.org
RA: 01h 44m 20s
Dec: +60° 40′ 4″
Ch: MSA:47, U2:37, SA:1
Ref: SIMBAD, Collinder (1931), DAML02, Archinal&Hynes (2003), Skiff20080430-s
Type: open cluster, 12m
Mag: B=8.4, V=7.9
Discovered by Caroline Herschel.
Synonyms: H VIII-065
Observed in 1787 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "a small cluster of small stars, not very rich. Caroline Herschel discovered it in 1783."
Photo Index by Jim Lucyk: Deep Sky #8 Fa84 p29, Vehrenberg's Atlas of DS Splendors (3ed) p31.
NGC 6595 = IC 4700, Vehrenberg's Atlas of Galactic Neb-2 p38 (photo includes IC 1283/1284).
Phelps and Janes give the outer cluster radius as 2.25arcminutes and list the minimum number of cluster members as 56. They include a plotted image of the cluster. [Phelps, R. L. & Janes, K. A. (1994) "Young Open Clusters as Probes of the Star Formation Process. 1. An atlas of open cluster photometry" Astrophys. J. Suppl. Series, 90:31-82.]
A catalogue of star clusters shown on Franklin-Adams chart plates. Mem.R.A.S., 60(5), 175-186.
Raab, S. (1922) A research on open clusters. Lund Medd. Astron. Obs. Ser. II, 28, 1.
Based of F-A plates: "contains only a small num of F* and is not clearly sep. from the environs."
Bailey, S.I. (1908) A catalogue of bright stars and nebulae. Ann.Harv.Coll.Obs., 60(8), 199.
Trumpler (Lick Obs Bulletin, Vol 14, No. 420) gives the diameter as 5' and the class as 2 2 p.
The RNGC (Sulentic and Tifft 1973) notes that this is a 10.0 mag open cluster.
Listed by the Herschel Club, described as "20 stars were counted in this loose and poor grouping of stars. Situated in a rich field, is near to NGC 663, can be seen in same eyepiece field. 6-inch, 48x."
In a 6-inch this cluster shows as a small glow behind a star or two.
7cm - sm mod f cl @ 30x w/a few res *s. 75x: about a dozen *s w/four brtr ones (about m10), most central of which is pair. some haziness. BS, 26Nov1992, Anderson Mesa.
8cm - sm gran-to-partially res spot @ 20x. BS, 17Oct1982, Anderson Mesa.
15cm - mod f cl in rich fld @ 80x. 140x: 4' diam w/20 *s w/mod but irreg concen twd center, which is marked by line of three *s. cl *s m11.5+. BS, 10Dec1990, Anderson Mesa.
25cm - sm, loose w/22 *s. not very br, 3' diam.
30cm - loosely concen. 4'.5 diam w/no more than 20 *s counted. S 4' is m10 *. *s fainter than m10.5. 238x.
Alldays (22.50S, 20.12E, 770m).
12-inch f/10 SCT (76x, 218x)
Surprisingly, NGC 659 revealed three bright stars on the south edge of the cluster, which displays a hazy patch to the NE. (95x). Not much of an observation but my best shot at the most northerly object seen so far. Small and not much to add.
Observing site: Little Tycho Observatory
[1h 44m 12s, 60° 42m 0s] Looks to me like a chance grouping of ~8 10-12mv stars. There might be a haze of much fainter ones, but that might be averted imaganation, too. Wikisky: There is a very slight clumping of Milky Way stars here
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.