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NGC 2489 (4,922 of 18,816)

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NGC 2489

NGC 2489, Dunlop 626, Cl Collinder 169, Cl VDBH 15, C 0754-299, COCD 174, Bennett 38, VII 23, h 479, h 3107, GC 1601

RA: 07h 56m 18s
Dec: −30° 04′ 0″

Con: Puppis
Ch: MSA:367, U2:362, SA:19

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

(reference key)

Type: open cluster, 12m

Mag: B=8.58, V=7.9

Size: 6′
PA: ?

Historical observations

William Herschel (c.1784)

Synonyms: H VII-023

Discovered in 1785 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "a compressed cluster of pretty large stars, considerably rich."

Dunlop, James (1827)

James Dunlop observed this object from Paramatta, New South Wales, and included it as No. 626 in his catalogue of 1827. Using a 9-inch f/12 telescope, he described it as "a cluster of small stars, of an irregular round figure, with faint nebula, easily resolvable. The 257 Argus is south following."

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 "Cluster 7th class. Round, 5' diameter, stars 12th mag." On a second occassion he called it "A round, pretty compressed cluster of stars 11..13th mag; 6th or 7th class; gradually brighter in the middle, pretty rich, 7' diameter."

Published comments

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.

Trumpler, R.J. (1928)

Trumpler (Lick Obs Bul, Vol 14, No. 420) gives the diameter as 7' and the class as 1 2 m.

Sulentic & Tifft (1973)

The RNGC (Sulentic and Tifft 1973) notes that this is a 9.5 mag open cluster.

Modern observations

Ancient City Astron.Club (1980)

Listed by the Herschel Club, described as "some 30 stars, small, faint stars, stands out well, circular in shape, two bright stars stand out within cluster. 8-inch, 48x."

Steve Coe

Steve Coe, observing with a 13" f/5.6, notes: "Bright, pretty large, pretty rich, not compressed, 31 stars in nice chains counted at 100X. Seen in 11X80 finder."

Tom Lorenzin

Tom Lorenzin, in the electronic version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "7.9M; 8' diameter; small and scattered; 35-plus 11M and dimmer members; bright star to SE is 5M SAO 198636."

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.

Pretty large, bright, round to irregular. Nice example of an open cluster. Spacious with pinpoint bright and faint stars, a little compact to the middle, outliers run uneven to the far edges. Standing fairly out to the background.

(no date)

12-inch f/10 SCT (EP: 2-inch 32mm SW 95x 42' fov; 2-inch 14mm UW 218x 23' fov)

Pretty bright, round to slightly irregular in shape. Nice example of a typical medium size open cluster. Spacious with pinpoint bright and faint stars radiate in loose woven curls around a little compact middle with dark areas in-between. Outliers run irregularly out to the far edges. Standing fairly well out against the background. Contains about 30 stars.

Richard Ford

2013 April, 13th Saturday

Location:Perdeberg.

Time:11:18pm.

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 Dobsonain.

This open cluster is well arranged in an east west direction and that this clusters stars are slightly concentrated towards each other.This open cluster is arranged in a circular motion and that this cluster has bright and faint stars being mixed together.This open cluster consists of 11th to 12th magnitude stars.This open cluster measures 23.9'x 18.3'.

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The Messier objects

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