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RA: 21h 53m 36s
Dec: +62° 36′ 0″
Ch: MSA:1072, U2:33, SA:3
Ref: SIMBAD, Collinder (1931), DAML02, Archinal&Hynes (2003)
Type: open cluster, 13p
Mag: B=6.34, V=6.1
It is a member of the Cepheus OB 2 Association.
Synonyms: H VIII-067
Discovered in 1787 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "a cluster of coarsely scattered large and small stars, 7' diameter, like a forming one."
Trumpler (Lick Obs Bul, Vol 14, No. 420) gives the diameter as 10' and the class as 1 3 p.
The RNGC (Sulentic and Tifft 1973) notes that this is a 6.5 mag open cluster.
Tom Lorenzin, in the e-version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "6.6M; 7' diameter; 25-plus 7M and dimmer members; bright and sparse grouping."
Listed by the Herschel Club, described as "Bright, scattered, with some 25 stars within the grouping, rich and resolvable. 6-inch, 35x."
6cm - ten *s, elong NE-SW w/two br *s in NE end. a little haziness.
15cm - fairly br loosely scattered cl w/two br *s. 140x shows 35 *s in 10'
diam circ area. brtr * are in grp elong NE-SW twd center. 195x shows f
comps fairly close to three brtst *s (third is at SW end of elong grp).
BS, 8Sep1991, Anderson Mesa.
25cm - easy, br. 15 *s in 5'x2 area. a grp of mult *s. br wide pair on N.
30cm - loose w/o concen. 30 *s in irreg 8' cl. two br *s NE of center. triplet
on NW has two colored *s.
The Messier objects
The Bennett objects
The Caldwell list
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