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RA: 01h 29m 33s
Dec: +63° 18′ 6″
Ch: MSA:34, U2:16, SA:1
Ref: SIMBAD, Collinder (1931), DAML02, Archinal&Hynes (2003), Skiff20080430-s
Type: open cluster, 11m
Mag: B=9.85, V=9.5
Synonyms: H II-473, H VII-048
H VII-048 was recorded on November 9, 1787 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "a compressed cluster of some pL and many vS stars, iR, 6' or 7' diameter."
Photo Index by Jim Lucyk: Deep Sky #8 Fa84 p25.
Trumpler (Lick Obs Bulletin, Vol 14, No. 420) gives the diameter as 6' and the class as I 2 m
The RNGC (Sulentic and Tifft 1973) notes that this is a 7.5 mag open cluster.
Listed by the Herschel Club, described as "some 60 stars were counted in this rich and bright cluster, loosely scattered. Appears to be a chain of stars with a fairly bright star situated within the cluster. 6-inch, 43x."
Tom Lorenzin, in the electronic version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "9.5M; 4' diameter; 50-plus 10M and dimmer members; compact and rich group."
who-sis: string of *s NW about m10.5.
8cm - sim to oc N659 @ 20x. gran-to-partially res. string of four *s extend NW from center. BS, 17Oct1982, Anderson Mesa.
15cm - mod f grainy/fuzzy cl @ 80x distinguished by triangle on m11 *s sup nr center. 140x/165x: outliers reach NW as far as m10.5 * at NW edge. few *s in SE quad SE of triangle. 30 *s mostly m13.5+ w/mod concen. BS,11Dec1990, Anderson Mesa.
25cm - sm, 3' diam w/three brtr *s and 20 f threshold mag *s.
30cm - three br *s in SE section of cl. 40 *s counted fntr than m12 w/even sprinkling, mostly m12. highly irreg outline: stretches to SW w/curving line to NE. NW 5' is m10 *. 9'x5' in pa45.
Observing site: Little Tycho Observatory
[1h 29m 30s, 63° 18m 0s] A faint smattering of nebulosity surrounding 3 9-10mv stars. WikiSky: the nebulosity is a cloud of about 30 13...mv stars. Tonight's skies were hazy, and the night ended early, clouded out.
The Messier objects
The Bennett objects
The Caldwell list
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