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NGC 2243 (4,204 of 18,816)


oc gc pln bn dn gx gxcl ast aka lost




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NGC 2243

NGC 2243, Cl Collinder 98, Cl Melotte 46, ESO 426-16, C 0627-312, Bennett 36a, h 3053, GC 1423

RA: 06h 29m 34s
Dec: −31° 17′ 0″

Con: Canis Major
Ch: MSA:371, U2:360, SA:19

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

(reference key)

Type: open cluster, 12r

Mag: B=10.12, V=9.4

Size: 5′
PA: ?

Historical observations

Dunlop, James (1827)

James Dunlop discovered this object from Paramatta, New South Wales, and included it as No. 616 in his catalogue of 1827. Using a 9-inch f/12 telescope, he described it as "an ill-defined faint nebulosity of some considerable extent, with several small stars scattered in it."

John Herschel (1847) Cape Observations

Observed by Sir John Herschel at the Cape of Good Hope with an 18-inch f/13 speculum telescope. He recorded it as "pB, R, gbM, 4' diameter, mottled or resolved, amongst bright stars." On a second occassion he called it "pB, R, vglbM, all evidently resolved into stars, not very rich. Something between a cluster and a globular cluster."

Published comments

Stewart (1908) Ann.Harv.Coll.Obs., 60 (6)

Table IV: As in NGC, but F open cl, st 9-11 mag.

Melotte, P.J. (1915)

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

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.

Trumpler, R.J. (1928)

Trumpler (Lick Obs Bul, Vol 14, No. 420) gives the diameter as 4' and the class as 1 2 m.

Burnham's Celestial Handbook

Burnham calls this a pretty bright, small round open cluster, 4' across, containing about 50 faint stars.

Sulentic & Tifft (1973)

The RNGC (Sulentic and Tifft 1973) notes that this is a 10.5 mag open cluster.

Phelps, R. L., Janes, K. A. & Montgomery, K. A. (1994)

Phelps, R. L., Janes, K. A. & Montgomery, K. A. (1994) Development of the galactic disk: A search for the oldest open clusters. Astron.J., 107(3), 1079.

Included in Table 6: The oldest open clusters.

Modern observations

Tom Lorenzin

Tom Lorenzin, in the electronic version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "10M; 4' diameter; 70-plus faint members; small and very rich group with one 7M star (SAO 196879) off the NE edge."

Steve Coe

Steve Coe, using a 17.5" f/4.5, notes: "pretty bright, Compressed, Round, many faint stars, looks like a globular somewhat"

Brian Skiff

who-sis: pair V=12.0,12.2; ~13"; pa53. fntr * = j. brtr *s in box = M, P, and N, ~1'.5 from center, 11.8

15cm - f haze SW of m7.5 *. has m10 *s on NE, NW, & SW sides boxing it in. one m10.5 * on NW side of haze.

- sm hazy cl of hisfcbr @ 50x, a few fld *s sup. 140x: 3' diam, boxed in by brtr *s, incl wide = pair ENE. 20 *s res mostly nr threshold, plus a few brtr ones (m12) on W side of brtr part. still haze @ 140x. BS, 25Feb1990, LCO.

25cm - 4' diam, partially res w/20 *s and haze.

30cm - sm unevenly concen cl w/an overcast of ~15 brtr fgrnd *s. 4' diam w/three brtr *s on W side. irres, ~10 *s w/clumpy haze. m12.5 pair lies E, 10" sep in pa45.

Contemporary observations

Magda Streicher

1998 January 25

Location: Pietersburg (South 23 53. East 29 28).

Sky conditions: Good.

Instrument: Meade 12 inch (Eyepiece 40mm).

Date: 25 January 1998.

Field of view: 52.7 arc minutes.

Large, faint and clean irregular open cluster, spacious, with mixed magnitude stars stretched towards the edges. To the north east stars look more fainter and closer together with a nice faint double to round it off. About 4 to 5 arc minute in size.

(no date)

12-inch f/10 SCT (EP: 2-inch 40mm SW 76x 53' fov; 2-inch 14mm UW 218x 23' fov)

Quite a pretty open cluster, spacious, with a mixed multitude of stars, not very outstanding against the star-field. Slightly oval and appears in a way like a globular. Prominent double star situated just to the east of the cluster and show off beautifully (218x). Field stars group in an asterism 8' arc minutes to the east.

Auke Slotegraaf

1994 February 08

1994-02-08, Die Boord, 11x80's tripod-mounted. Could not find this cluster.

Richard Ford

2013 January 13 Sun



Sky Conditions:The fainter parts of the Milky Way are barely visible.Haziness only visible on the horizon.Atmosphere stable with little interference.

Instrument:12-inch Dobsonian.

This open cluster consists of 28 stars which is arranged in and east west direction which is embedded in an unresolved background haze.The stars in this cluster is well detached and that the stars are nearly the same brightness as each other.This open clusters stars are well within the magnitude range of 12.This open cluster measures 7.1'x 3.5'with P.A:East/West.Chart No.92,NSOG Vol.1.

Favourite lists

Lacaille's catalogue

The Messier objects

Dunlop's catalogue

The Bennett objects

The Caldwell list

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