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RA: 20h 06m 0s
Dec: +35° 47′ 0″
Ch: MSA:1149, U2:119, SA:9
Ref: SIMBAD, Collinder (1931), DAML02, Archinal&Hynes (2003)
Type: open cluster, 22pn
Mag: B=5.43, V=5.2
This cluster is possibly a member of the Cygnus OB 3 Association.
Trumpler (Lick Obs Bul, Vol 14, No. 420) gives the diameter as 25' and the class as 4 3 p.
The RNGC (Sulentic and Tifft 1973) notes that this is a 6.0 mag open cluster.
Tom Lorenzin, in the e-version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "5.2M; 20' diameter; 15-plus 7M members; large and sparse; bright star in the NE portion is 5.5M 27 CYG."
MacRobert notes that although this cluster is catalogued as having only 15 stars very loosely spread over 20', "there's clearly more going on here, perhaps in the cluster's background. Two bright pairs in the cluster's middle are each surrounded closely by many fainter stars, more and more of them the longer you look. Here's a place to use high power."
Hartung notes "a large field is needed for this bright scattered cluster on a profuse starry ground; it includes the bright orange 27 Cyg and amongst others an unequal pair (7.0 9.5; 11 arcsec, 300 deg), and is a good object for small apertures."
6cm - not vdistinct from Milky Way. nine brtr *s strung Swd from 27 Cyg. two
nice pairs on N side, N one colored. 27 Cyg orangish.
15cm - interesting mult * reminiscent of far-southern oc @ 80x. two grps nr m7
*s: Srn one incl nine *s as f as line of three m14 *s aligned E-W to S
of brtst; Nrn grp has six *s, fntst on S edge. BS, 15Oct1990, Anderson
25cm - brilliant @ 47x. 90x shows an array or close colored mult *s. on N is
27 Cyg. in center are br pairs, many w/close comps.
30cm - a rich fld w/dk areas to E&W. 80 *s or so in 25' diam cl.
Alldays (22.50S, 20.12E, 770m).
12-inch f/10 SCT (95x, 218x)
Stars display a beautiful combination of various magnitude stars. Open feeling with two groups N and S. The southern grouping is more densted with more stars which had open spaces in between. Very busy star field and a few stars show up as double. Just 11' SW from 29 Cygni
The Messier objects
The Bennett objects
The Caldwell list
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