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NGC 2423 (4,750 of 18,816)

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NGC 2423

NGC 2423, Cl Collinder 153, Cl Melotte 70, C 0734-137, COCD 148, VII 28, h 3090, GC 1552

RA: 07h 37m 6s
Dec: −13° 52′ 0″

Con: Puppis
Ch: MSA:296, U2:274, SA:12

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

(reference key)

Type: open cluster, 22m

Mag: B=7.15, V=6.7

Size: 12′
PA: ?

Historical observations

William Herschel (c.1784)

Synonyms: H VII-028

Discovered in 1786 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "a cluster of pS stars, pretty rich, 15' diameter."

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 "a very large, rich fine cluster of small stars which nearly fills the field. Place that of a double star, class II."

Published comments

Trumpler, R.J. (1928)

Trumpler (Lick Obs Bul, Vol 14, No. 420) gives the diameter as 19' and the class as 1 2 m.

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.

Photo index

Photo Index by Jim Lucyk: Vehrenberg's Atlas of DS Splendors (3ed) p87.

Sulentic & Tifft (1973)

The RNGC (Sulentic and Tifft 1973) notes that this is a 7.0 mag open cluster.

Modern observations

Coe, Steve (1996)

Steve Coe, in SACNEWS On-Line for February 1996, writes: "NGC 2423 is pretty bright, large, pretty rich, pretty compressed, 33 stars counted at 100X. A nice binary star is in the center with both components a lovely dark yellow. It is at 7 hr 37.1 min and -13 52."

Ancient City Astron.Club (1980)

Listed by the Herschel Club, described as "some 60 stars counted, large with bright stars and some faint ones, stands out well. 8-inch, 48x."

Steve Coe

Steve Coe, observing with a 13" f/5.6, notes: "Large, pretty bright, pretty rich, pretty compressed, 33 stars counted at 100X. Nice binary star in the center with both components a lovely dark yellow."

AJ Crayon

AJ Crayon, using an 8" f/6 Newtonian, notes: "is an open cluster. It is 20' has 20 stars from 10 to 12m at 100x. This cluster has a nice double star in the center of 8m and 11m separated by 3" in position angle 315 degrees."

Contemporary observations

Tom Bryant

2010 11 18 4:43:58

Observing site: Little Tycho Observatory

Telescope: C-8

[7h 37m 6s, -13 52' 0"] A coarse cluster of 8...mv stars. There are 5 pairs in it. Nice.

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