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RA: 18h 51m 18s
Dec: +10° 19′ 0″
Ch: MSA:1246, U2:205, SA:16
Ref: SIMBAD, Collinder (1931), DAML02, Archinal&Hynes (2003)
Type: open cluster, 42m
Mag: B=7.18, V=6.7
NGC 6709 may also be NGC 6724, which see.
In the 5th edition of Webb's Celestial Objects for Common Telescopes it is described as "beautiful wide group, [stars] 9.5-11th mag."
Burnham calls it a pretty rich, loose, little compressed cluster of about 40 stars.
Trumpler (Lick Obs Bul, Vol 14, No. 420) gives the diameter as 12' and the class as 2 2 p.
The RNGC (Sulentic and Tifft 1973) notes that this is a 7.5 mag open cluster.
Doig, P. (1925) Notes on the nebulae and clusters in Webb's 'Celestial Objects for Common Telescopes' (Sixth edition, Vol.ii). Part I. M.N.R.A.S., 35(5), 159.
Doig, P. (1926) "A Catalogue of Estimated Parallaxes of 112 Nebulae, Open clusters and Star Groups", Vol 36 (4), p 107-115.
"distinct irregular cluster." He gives the approx. diameter as 17 arcmin.
Raab, S. (1922) A research on open clusters. Lund Medd. Astron. Obs. Ser. II, 28, 1.
Discussed, based of F-A plates.
Photo Index by Jim Lucyk: Burnhams V1 p230.
A catalogue of star clusters shown on Franklin-Adams chart plates. Mem.R.A.S., 60(5), 175-186.
Hartung notes that "this group of medium bright stars about 15' x 12' lies in a fine field and has little central condensation; there are three pointed lobes north-preceding and an orange star south following. The cluster is fairly rich but not effective with small apertures."
Sanford notes that this is the only prominent open cluster in Aquila - it is "large but has little central condensation. It takes an 8-inch or larger aperture to appreciate."
Steve Coe, in "SACNEWS On-line for September 1996", observing with a 13-inch, notes: NGC 6709 is a nice open cluster in the 13"; large, pretty rich and not compressed at 100X. I counted 59 member stars, including several nice chains of stars. There is a wide blue and gold double on the western edge of the cluster. This cluster was seen in 11 X 80 finder at 18 hr 51.5 min and +10 21.
Steve Coe, using a 13" f/5.6, notes: "Large, pretty rich, not compressed at 100X, 59 members counted. Several nice chains of stars with wide blue and gold double star on the western edge of the cluster. Seen in 11 X 80 finder."
Phil Harrington (1990, Touring the Universe through Binoculars) calls it a "collection of about two dozen stars set within a 13' area . . their dim light blurs together to form a ghostly haze against the background sky."
Tom Lorenzin, in the e-version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "8M; 12' diameter; 40-plus 9M and dimmer members; kinda out there by its lonesome; 5 degrees SW of 3M Zeta AQL."
AJ Crayon, using an 8" f/6 Newtonian, notes: "is a bright open cluster that is visible in an 8x50 finder as a small round and faint patch of light. At 120x I counted 20 stars from 8m to 12m in a 20' area. It forms a Y shape and has a sprinkling of many fainter stars.
7x35mm - mod f and grainy w/brtr * on NE edge. BS, 28Jun1992, Hutch Mtn.
8x50mm - consp as hazy spot. BS, 3Sep1981, Anderson Mesa.
7cm - nice, mod br isolated cl @ 30x. seems to be in circ dk area 1.25deg diam. cl nrly contained in triangle of brtr *s, the vertex on E comprised of dbl w/third br comp. about 35 *s @ 50x in immed region of the triangle. BS, 30Jun1997, Anderson Mesa.
8cm - br, well res @ 20x. two br *s on W side like wide dbl. cl triangular, w/br pair at one corner. BS, 13Sep1982, Anderson Mesa.
15cm - consp @ 30x. seems squarish w/hole. *s mostly on E&W ends. 18' diam overall. hole is shaped like chapel door. string string of *s on W going N-S. HM, Roof.
- br cl 25'-30' diam w/a couple of br wide pairs on E side, both easy @ 125x. 45 *s, most m11, some m9.5-11. BS, 3Sep1981, Anderson Mesa.
- consp @ 30x, mod well detached from fld. the two brtr *s on the E side are both pairs res @ 50x. 80x/140x: 12' diam, somewhat oval elong ~E-W. 70 *s counted, not much concen, brtr *s on E&W sides. BS, 2Jul1989, Anderson Mesa.
25cm - br; square outline by br *s on perimeter. on E is odd-looking trapezoid
w/Ern pair being fairly close. 60 *s to m13 in 15' area. some threshold haze, some dk patches w/in. BS, Roof.
- 190x: 90 *s incl sev m-12-13 pairs. nice, scattered. BS, 3Sep1981, Anderson Mesa.
30cm - 140x: 18' diam, ~75 *s m8-11.5. loose. CBL, Roof.
Karoo Star Party, Britstown, Northern Cape, ZA.
15x70 Celestron binoculars.
Highly granular, large (12.5') triangular (approx. equilateral) grouping, well-separated from the background. This mottled grouping has a single brighter star, in the south-western corner (HD 229716, V=9.0).
1997 July 7, Monday, 21:00 - 24:00 Jonkershoek. 11x80's tripod-mounted. IN the field with many 7-8th mag stars. Cluster shaped like an equilateral triangle. One bright star at the south-east corner; stars in other tips, too. Inbetween, filled with faint haze of unseen suns.
16-inch f/10 SCT (127x 290x)
The brighter stars in this grouping displays a sort of fish shape point its starry nose towards the south-west. Fainter stars forms string and pairs to fill in the gaps. A very striking magnitude 9 golden star situated on the south-western edge of the group.
The Messier objects
The Bennett objects
The Caldwell list
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