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NGC 6649 (15,207 of 18,816)

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NGC 6649

NGC 6649, Cl Collinder 384, C 1830-104, Ocl 66, h 3751, GC 4420

RA: 18h 33m 30s
Dec: −10° 24′ 0″

Con: Scutum
Ch: MSA:1343, U2:295, SA:16

Ref: SIMBAD, Collinder (1931), DAML02, Archinal&Hynes (2003)

(reference key)

Type: open cluster, 13m

Mag: B=10.35, V=8.9

Size: 5′
PA: ?

Historical observations

John Herschel (1847) Cape Observations

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."

Published comments

Trumpler, R.J. (1928)

Trumpler (Lick Obs Bul, Vol 14, No. 420) gives the diameter as 7.5' and the class as 1 2 m.

Raab, S. (1922)

Raab, S. (1922) A research on open clusters. Lund Medd. Astron. Obs. Ser. II, 28, 1.

Discussed, based of F-A plates.

Helwan Obs. Bulletin No 22 (1921)

S, glboaulr cluster in a large space devoid of stars. In corner of plate.

Sulentic & Tifft (1973)

The RNGC (Sulentic and Tifft 1973) notes that this is a 10.5 mag open cluster.

Vorontsov-Velyaminov, B. (1925/1926)

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

Melotte, P.J. (1915)

A catalogue of star clusters shown on Franklin-Adams chart plates. Mem.R.A.S., 60(5), 175-186.

Modern observations

Tom Lorenzin

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

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.

Brian Skiff

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.

Contemporary observations

Auke Slotegraaf

1983

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 June 01

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.

Magda Streicher

13 June 2008

NGC: 6649 SCUTUM

Open Cluster

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.

Favourite lists

Lacaille's catalogue

The Messier objects

Dunlop's catalogue

The Bennett objects

The Caldwell list

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