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NGC 7245 (17,126 of 18,816)


oc gc pln bn dn gx gxcl ast aka lost




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NGC 7245

NGC 7245, Cl Collinder 449, C 2213+540, Ocl 225.0, VI 29, h 2157, GC 4774

RA: 22h 15m 16s
Dec: +54° 20′ 12″

Con: Lacerta
Ch: MSA:1086, U2:57, SA:3

Ref: SIMBAD, Collinder (1931), DAML02, Archinal&Hynes (2003)

(reference key)

Type: open cluster, 22m

Mag: B=9.81, V=9.2

Size: 5′
PA: ?

History and Accurate Positions for the NGC/IC Objects (Corwin 2004)

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.

Historical observations

William Herschel (c.1784)

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."

Published comments

Trumpler, R.J. (1928)

Trumpler (Lick Obs Bul, Vol 14, No. 420) gives the diameter as 4' and the class as 2 2 p.

Sulentic & Tifft (1973)

The RNGC (Sulentic and Tifft 1973) notes that this is a 11.5 mag open cluster.

Raab, S. (1922)

Raab, S. (1922) A research on open clusters. Lund Medd. Astron. Obs. Ser. II, 28, 1.

Discussed, based of F-A plates.

Melotte, P.J. (1915)

A catalogue of star clusters shown on Franklin-Adams chart plates. Mem.R.A.S., 60(5), 175-186.

Modern observations


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.

Walter Scott Houston

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

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.

Brian Skiff

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'.

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