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RA: 19h 41m 18s
Dec: +40° 11′ 12″
Ch: MSA:1129, U2:84, SA:8
Ref: SIMBAD, Collinder (1931), DAML02, Archinal&Hynes (2003)
Type: open cluster, 11r
Mag: B=8.21, V=7.3
An open cluster in Cygnus that is of 7th magnitude. It is about 5' across, and contains about 20 stars. The Webb Society handbook mentions several reports of nebulosity involved with the group.
Trumpler (Lick Obs Bul, Vol 14, No. 420) gives the diameter as 6' and the class as 1 2 r.
Raab, S. (1922) A research on open clusters. Lund Medd. Astron. Obs. Ser. II, 28, 1.
Discussed, based of F-A plates.
Roslund, C. (1960) Remarks on Some New and Some Known Galactic Clusters. PASP, 72(426), 205. [1960PASP...72..205R]
"Faint cluster of late type stars."
The RNGC (Sulentic and Tifft 1973) notes that this is a 10.0 mag open cluster.
Photo Index by Jim Lucyk: Sky&Tel. 9/82 p292, Sky&Tel. 12/80 p476, Burnhams V3 p1617, Deep Sky #22 Sp88 p44-45, Vehrenberg's Atlas of DS Splendors (3ed) p209, Rev.Shapley-Ames Cat.of Bright Gal. (Sandage,Tammann 1981) p113, Field Guide to Stars & Planets (Menzel, 1964) p135.
A catalogue of star clusters shown on Franklin-Adams chart plates. Mem.R.A.S., 60(5), 175-186.
Houston notes that he found this cluster in his youth with a 40x 1-inch scope, in which it was "barely detectable. . . A large telescope will resolve this pretty 6' cluster into many stars of magnitude 12 and fainter.
Harrington writes: "NGC 6819 appears as a hazy glow with a few dim stars. Instruments of 6- to 8-inch aperture partially resolve the cluster into a dense throng of faint stars unevenly distributed across 10'. Larger instruments reveal more than 100 suns. Many observers comment on the asymmetric appearance of NGC 6819. For instance, in the [Webb Society handbook] Guy Hurst describes the cluster as roughly U-shaped as seen with a 10-inch telescope. By contrast, Luginbuhl and Skiff liken it to the letters K or X."
Hartung notes: "This is a rich but distant cluster and the stars are not bright, so that 20cm is needed to resolve it well; the main part is about 5' across and melts into a well-sown star field with two bright stars nf and sf. Small apertures show it as a small hazy area."
Tom Lorenzin, in the e-version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", calls it "The Foxhead" and notes: "10M; 6' diameter; 150-plus 11 thru 14M members; two v-like "ears" pointing NW with starless space between them."
POSS: * NE 8'.2, SSE 11'.2.
8cm - modhisfcbr spot, well concen, grainy. maybe a few *s res. BS, 13Aug1983, Anderson Mesa.
15cm - nice, partially res + neb @ 80x/140x. 15' total diam, not quite reaching to br *s E&S. lg `corona', rel well-concen core 7' across that has 75 *s incl consp m12 pair on SE. 150 *s total. BS, 16Jun1988, KPNO.
20cm - mod f cl w/50 *s vis in 5' area. shape is X- or K-like form; w/four bars of *s anyway. many f *s in fld. cl lies N of a br *. sev br *s w/in 2deg of cl. JM/BS, 19Aug1971, FtL.
25cm - fairly br w/unres haze @ 90x. a line of *s SE-NW on W side of cl; a pair on the S and a sm irresolveable clump on the E. 75 *s in 5' area.
30cm - 238x: 80 *s in 5' area, irreg concen. two sm concens on E, the Srn one being lgr w/20 *s. on W is strip of five *s running N-S. well res, no haze.
Location: 90 Millimeter Observatory
Telescope: Explore Scientific 152mm Refractor
Limiting magnitude: 6.1
Sky conditions: 3/8
The cluster shows about 10 stars of magnitude 11 or 12 against a hazy background at 71x.
The Messier objects
The Bennett objects
The Caldwell list
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