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RA: 18h 33m 30s
Dec: −10° 24′ 0″
Ch: MSA:1343, U2:295, SA:16
Ref: SIMBAD, Collinder (1931), DAML02, Archinal&Hynes (2003)
Type: open cluster, 13m
Mag: B=10.35, V=8.9
Discovered by Sir John Herschel at the Cape of Good Hope with an 18-inch f/13 speculum telescope. He recorded it as "Cluster VIII class; a small well insulated groupo of a roundish figure, 5' diameter, stars 12..13m, one star 9m, at the southern edge."
Trumpler (Lick Obs Bul, Vol 14, No. 420) gives the diameter as 7.5' and the class as 1 2 m.
Raab, S. (1922) A research on open clusters. Lund Medd. Astron. Obs. Ser. II, 28, 1.
Discussed, based of F-A plates.
S, glboaulr cluster in a large space devoid of stars. In corner of plate.
The RNGC (Sulentic and Tifft 1973) notes that this is a 10.5 mag open cluster.
Vorontsov-Velyaminov, B. "Integral magnitudes of south star clusters", Astron. Nach. 228, 325. Comparing the brightness of the cluster with the extrafocal images of stars, he estimates the magnitudes as 8.84
A catalogue of star clusters shown on Franklin-Adams chart plates. Mem.R.A.S., 60(5), 175-186.
Tom Lorenzin, in the e-version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "9M; 7' diameter; 50-plus 11M and dimmer members; includes DBL ST Struve 2325 (12.4" separation @ PA 256; 6-9M) at SE edge of cluster; (possible ERROR! on DBL ST; observed to be fainter, closer in separation and with PA @ approx. 090)."
Steve Coe, observing with a 17.5" f/4.5 at 100X, notes: "Pretty bright, pretty small, somewhat compressed, 25 stars counted at 100X. It was seen in the 50mm finder. The field has several dark lanes in it and there is a lovely orange star on the nothern edge.
whosis: pair on S = ADS11441: V= 9.7,11.4; 4".1; 90.
7cm - brtr than expected. 30x: br * on S consp. gran to part-res. 75x: well-
concen w/15 *s res plus fairly strong nebulous glow. fld nrly blank.
BS, 23Jun1996, Mars Hill.
15cm - f, not a hint of res @ lox. 60 shows about 15 *s, haziness.
- br * consp, plus 15-17 others. BS, 7Aug1980, Anderson Mesa.
- 18 *s @ 125x, not hazy. in rather blank fld. m9 * res by 125x: m9,11.5; 10"; pa95. BS, 15Mar1981, Anderson Mesa.
- mod f but wonderfully isolated cl in lg dk area. 6' diam w/30 *s res @ 140x, mostly m12+. pair on S res @ 80x, although comp is vf. some haziness which goes away using best averted vis, revealing dozens more *s but only fleetingly. BS, 21Jun1990, Anderson Mesa.
25cm - less than 5' diam. m9 pair on SW edge. m10.5 *s around periphery; inside is m11 cen *. 20*s total, some haze.
- 4'-5' diam, m10 * on SSW side. 30 more *s, m11+. lies in blank spot w/few fld *s. no bkgrnd haze. BS, 7Aug1980, Anderson Mesa.
- 28 *s in 4' area @ 190x. m9 * on SSW. unconcen, most *s m12+. BS, 15Mar1981, Anderson Mesa.
30cm - loose, 20 *s. m10 * on S. no haze. *s m11-12.5. 5' diam.
Observing from Stellenbosch, 1983, I saw this cluster in a 2-inch refractor as a very very faint object, only glimpsed with averted vision. Appears like a bright star surrounded by hazy nebulosity.
1995-06-01: 11x80. Kelsey Farm. 23:00 SAST. Quite a noticeabel object. Looks like a deocused star or globular cluster. A neat little object; it has right on its south-west border a 9th mag prick of light. Two bright field stars help locate it. I noticed the cluster while star-hopping to this bright pair.
NGC: 6649 – SCUTUM
RA: 18h33m27s - DEC: -10°24'12" - Magnitude: 8.9 - Size: 6'
Tel: 16" S/C – 102x - 127x - 290x - Date: 13 June 2008 - Site: Pburg - Good
Lovely splash of faint stars, well resolved. Faint stars towards the middle area for a sort of a bar more or less in a E-W direction. High power is needed and the cluster contain more or less 25 stars between 9-13 magnitude. Dark lanes can be seen.
The Messier objects
The Bennett objects
The Caldwell list
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