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NGC 6704 (15,394 of 18,816)

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NGC 6704

NGC 6704, Cl Collinder 390, C 1848-052, Ocl 82, Ocl 82.0, GC 4435

RA: 18h 50m 54s
Dec: −05° 12′ 0″

Con: Scutum
Ch: MSA:1318, U2:250, SA:16

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

(reference key)

Type: open cluster, 12m

Mag: B=10, V=9.2

Size: 5′
PA: ?

Remarks

This open cluster is located in the middle of a large dark nebula, superimposed on the rich Milky Way field in Scutum. Only 6' across, it contains about 20 stars.

Published comments

Trumpler, R.J. (1928)

Trumpler (Lick Obs Bul, Vol 14, No. 420) gives the diameter as 5' and the class as 1 2 p.

Houston writes that it lies one degree due north of M11 and adds "it is about 2' across and contains stars between 10th and 12th mag. The Webb Society handbook on open and globular clusters contains a drawing of NGC 6704 made by Canadian amateur Pat Brennan. He shows the group as distinctly elongated in a north-south direction, and this can be seen will in my 5-inch apogee scope. Since the cluster lies in front of a large area of dark nebulosity, it is easily picked out from this otherwise rich region in the Milky Way."

Sulentic & Tifft (1973)

The RNGC (Sulentic and Tifft 1973) notes that this is a 9.5 mag open cluster.

Photo index

Photo Index by Jim Lucyk: Deep Sky #23 Su88 p27.

Modern observations

Tom Lorenzin

Tom Lorenzin, in the e-version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "10M; 2' diameter; 25-plus 12 thru 14M members; in a larger field of bright stars; oblong outline withaxis oriented WSW-ESE; cluster M-11 is 1 degree due S."

Brian Skiff

Forbes & DuPuy: * SSE V=11.35/2.04. three *s on E are V=12.,12.2(var),12.6.

8cm - mod f haze in dk area. unres. BS, 17Aug1982, Anderson Mesa.

15cm - about 5 *s, main body of cl is in arrow shape pointing N. quite f and uninteresting. underlying haze with hint of res---but they don't. BS.

- mod f cl in lg dk area, res @ 50x. 140x: main body 2'.5 diam w/15 *s m12+. brtst is in Ern arm of V-shaped *ism pointing N. m12.5-13 pair in Wrn arm SW of brtst. outliers to N w/30*s in 6'x3' area incl these. BS, 22Jun1990, Anderson Mesa.

25cm - quite f. surrounding fld is devoid of *s. 5' diam. br * (m9) on SE with three br *s on E edge. 10-12 *s vis, seems compact.

- only 15 *s @ 125x brtr * on S side. 6' diam, *s m12.5+. BS, 15Mar1981, Anderson Mesa.

30cm - 238x: 15 *s, m10.5-12. arc on N side. not interesting. CBL, Roof.

Steve Coe

Steve Coe, observing with a 17.5" f/4.5 at 100X, notes: "Pretty bright, round, pretty compressed, 25 stars counted at 135X. The cluster has a fish hook shape and is surrounded by a dark lane that rings the cluster.

Contemporary observations

Auke Slotegraaf

1995 June 01

1995-06-01: 11x80. Kelsey Farm. 22:00 SAST. A very tentative catch. Not at all sure that I see it. I suspect a small nebulous round patch in the position, but this is with some uncertainty.

1997 July 08

1997 July 8, Tuesday, 20:55 - 23:30 Jonkershoek. 11x80's tripod-mounted. Tiny smudge in B 111. Like a 9.5mag star unfocussed.

Magda Streicher

13 June 2008

NGC: 6704 SCUTUM

Open Cluster

RA: 18h50m54s - DEC: -05°12'00" - Magnitude: 9.2 - Size: 6'

Tel: 16" S/C 102x - 127x - 290x - Date: 13 June 2008 - Site: Pburg - Good

Just seen as a grouping against a faint star field. Very much in and N-S direction. Around a dozen 12-13 magnitude stars. A prominent dark lane on the eastern side of the cluster.

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