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RA: 22h 15m 16s
Dec: +54° 20′ 12″
Ch: MSA:1086, U2:57, SA:3
Ref: SIMBAD, Collinder (1931), DAML02, Archinal&Hynes (2003)
Type: open cluster, 22m
Mag: B=9.81, V=9.2
NGC 7245. Pulling this cluster up on the DSS, I wondered at first if the somewhat richer, but more distant cluster at 22 13 37.4, +54 09 38 (King 9) might have been seen by one of the Herschels. However, reducing both their positions to B1950.0 makes it clear that they both saw the same, nearer, poorer cluster: both positions are within an arcminute of the center as I see it on the DSS.
Synonyms: H VI-029
Discovered in 17867by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "a compressed cluster of eS stars."
Trumpler (Lick Obs Bul, Vol 14, No. 420) gives the diameter as 4' and the class as 2 2 p.
The RNGC (Sulentic and Tifft 1973) notes that this is a 11.5 mag open cluster.
Raab, S. (1922) A research on open clusters. Lund Medd. Astron. Obs. Ser. II, 28, 1.
Discussed, based of F-A plates.
A catalogue of star clusters shown on Franklin-Adams chart plates. Mem.R.A.S., 60(5), 175-186.
This small open cluster, only 3' across, is of 11th magnitude and needs high powers (150-200x) and averted vision to see well. It consists of several dozen stars.
In 1971, Houston wrote: "It is faint and only 3' across. Recently, I could not locate it with a 5-inch at 20x, but when I switched to my 4-inch at 100x it was clearly seen."
Tom Lorenzin, in the e-version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "10M; 3' diameter; 50-plus very faint stars; small and rich."
NGC 7252 "Four Petal Daisy", Sky&Tel. 6/87 p570, Cat.of South.Peculiar Gal.and Ass. Vol 2 (Arp&Madore, 1987) p15.1.
POSS: oc King 9 on N side of m11 * NE. its *s vf.
Yilmaz: W edge * is G=11.49. other br * lies further SSE.
15cm - another cl (like I1434) w/rel f *s. 50x: seems to be behind stratum of Milky Way *s; grainy only. star m14+. 140x: 6' diam at most, core defined by m11.5 * on W edge. 40 *s plus grainy haze of vf unres members. BS, 14Sep1990, Anderson Mesa.
25cm - found @ 90x. fairly f, but takes magnification well. *s m12+. 3' diam. 15 *s res + haze. in 10' area are more f *s. BS, Roof. - neat cl of f *s. 6' diam, *s little concen, m13.0+ (fntr than in I1434). 40 *s res w/vsl haze @ 190x. dark bar in pa30 on E side 1' wide, 5' long; some *s on E side of this. BS, 30Aug1981, Anderson Mesa.
30cm - nice cl w/f *s. pretty compact. 20 *s bounded on W & SE by m11 *s. 45" across w/haze; outliers to 2'.
The Messier objects
The Bennett objects
The Caldwell list
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