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RA: 21h 07m 12.8s
Dec: +50° 52′ 55″
Ch: MSA:1106, U2:56, SA:9
Ref: SIMBAD, Collinder (1931), DAML02, Archinal&Hynes (2003)
Type: open cluster, 32m
Mag: B=10.01, V=9.1
Synonyms: H VIII-074
Discovered in 1788 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "a cluster of coarsely scattered large stars, not rich, 6' diameter."
Trumpler (Lick Obs Bul, Vol 14, No. 420) gives the diameter as 7' and the class as 2 3 pU.
The RNGC (Sulentic and Tifft 1973) notes that this is a 11.0 mag open cluster.
15cm - rel poor cl in mostly dk 80x/50' fld. only 20 *s m10-14 in 3' diam.
brtr ones in circlet incl a sm triangle on E side. rel close approx =
pair just E of brtst *, which is on N side of circlet. another wider
pair to W. no vf *s. BS, 21Jun1991, Anderson Mesa.
The Messier objects
The Bennett objects
The Caldwell list
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