sponsored by psychohistorian.org
RA: 19h 52m 12s
Dec: +29° 25′ 0″
Ch: MSA:1172, U2:119, SA:8
Ref: SIMBAD, Collinder (1931), DAML02, Archinal&Hynes (2003)
Type: open cluster, 22m
Mag: B=8.46, V=7.8
Synonyms: H VIII-016
Discovered in 1785 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "a cluster of not very compressed stars, closest in the middle. It may be called (if the expression be allowed) a forming cluster, or one that seems to be gathering."
Roslund, C. (1960) Remarks on Some New and Some Known Galactic Clusters. PASP, 72(426), 205. [1960PASP...72..205R]
"The two brightest stars are of types F0 I and A0 Iab, followed by faint OB stars."
Raab, S. (1922) A research on open clusters. Lund Medd. Astron. Obs. Ser. II, 28, 1.
Discussed, based of F-A plates.
Trumpler (Lick Obs Bul, Vol 14, No. 420) gives the diameter as 7' and the class as 1 2 m.
The RNGC (Sulentic and Tifft 1973) notes that this is a 10.0 mag open cluster.
A catalogue of star clusters shown on Franklin-Adams chart plates. Mem.R.A.S., 60(5), 175-186.
On the border betrween Vulpecula and Cygnus lies this open cluster of about 50 stars. It is 5' in diameter and about 8th magnitude. Houston notes that it is "suitable for a 4-inch scope. It looks great in a 17-inch."
MacRobert calls this a faint but interesting cluster; "at first glance it displays a straight line of five stars oriented east-west. With averted vision a smattering of many additional faint stars appears behind it, apparently elongated in the same direction. I also thought I saw hints of a second cluster, smaller, fainter and more condensed, just off the southern edge."
Tom Lorenzin, in the e-version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "8M; 4' diameter; small, rich and compressed; 50-plus 11 thru 15M members; planetary N6842 (13M; 50" x 45" extent) faint and round; 38' to E and a little S."
15cm - hazy cloud @ 30x w/consp cen *. nicely res @ 80x. at 140x it is 6' diam, the outline roughly square. the brtr cen * in middle of line of five running approx E-W across cl, br * lies just E of concen core 30" across. at N&S `corners' are sm clumps of rel f *s, m12.5-13.5. 75 *s in 6' box. BS, 12Jul1988, Anderson Mesa.
25cm - fairly sm and surprisingly rich. br cen * w/50 fntr members. concen on S edge.
- nice cl. a line of *s 10' long runs E-W through center incl m9.5 cen *. clumps of *s 5' N&S of cen *. 40 *s seen other than br bar, m11+. circ, 7'-8' diam.
30cm - 35-40 *s, 7' diam. string of five *s even spaced aligned ESE-WNW is centered in cl. br *s in N. S 3' are f ones.
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.