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NGC 5823 (12,871 of 18,816)

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NGC 5823

NGC 5823, Cl Collinder 290, C 1502-554, Cl Melotte 131, Cl VDBH 169, COCD 361, Caldwell 88, h 3589, GC 4032

RA: 15h 05m 44.8s
Dec: −55° 37′ 30″

Con: Circinus
Ch: MSA:968, U2:431, SA:25

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

(reference key)

Type: open cluster, 22r

Mag: B=8.61, V=7.9

Size: 12′
PA: ?

Historical observations

John Herschel

Discovered by John Herschel at the Cape of Good Hope with an 18-inch f/13 speculum telescope. He recorded it as "Cluster class VII; a fine large cluster of separate stars 13..14th mag, 10' diameter; not much compressed in the middle; nearly fills the field."

Published comments

Union Observatory Circular (c.1919)

Described in Union Obs. Circulars, 45-76, p 50. "Nebulae, clusters, etc. on Sydney Plates" as "Cluster of about 80 stars, 12-16 mag., 8' in R.A. and 10' in Dec."

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.

Hogg, A.R. (1965)

"Cat. of Open Cl. south of -45° Decl.", Mem. 17 Mnt Stromlo Obs.

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 10' and the class as 3 2 m.

Sanford (1989) Observing the Constellations

Sanford notes that this open cluster has "about 80 stars and is appreciated only with a telescope of 12-inch aperture or greater."

Sulentic & Tifft (1973)

The RNGC (Sulentic and Tifft 1973) notes that this is a 8.5 mag open cluster.

Modern observations

Harrington, Phil

Phil Harrington (1990, Touring the Universe through Binoculars) notes "NGC 5823 lies just within the northern border of Circinus. It is a rich open cluster embodying some 100 stars shining at 10th magnitude and fainter and spanning 10' of arc."

ASV Journal (1971)

ASV Journal Vol 24 No 3 June 1971: "small Y-shaped cluster in 4-inch 64x."

Brian Skiff

15cm - mod rich mod br cl of ordinary size cf N5822 in Lup 1.2 deg N. outliers

to 10' diam, but main body 6' across w/60 *s m10.5+. uniform but clumpy

distribution of *s, the whole thing not unlike a miniature -22, sort of

core-plus-corona aspect. BS, 26Feb1990, LCO.

Contemporary observations

Auke Slotegraaf

1994 February 08

1994-02-08, Die Boord, 11x80's tripod-mounted. This is one of three milky way patches I swept up. It lies on the northern border of Circinus, with NGC 5822 due north. NGC 5823 shows as a pretty evenly distributed patch of faint stars, rather like a piece of frosted glass. It appears larger using averted vision, and I estimate the overall size as 10'. Close north-west lies Slotegraaf-de Kock 1. NGC 5823 is the faintest of these three milky way patches.

1997 September 03

1997 Sept 03: 11x80 tripod-mounted. 23:00 SAST. Jonkershoek. Like a smaller version of NGC 5822.

1998 April 24

1998-04-24/25, 11x80 tripod-mounted binoculars, Die Boord. Seeing average, transparency below average, dew. "Large (14') vaguely round granular patch, one of three in the field. No concentration or clumped area."

1997 October 02

6-inch f/8.6 Newtonian: 1997-10-02, Franschoek Pass viewing site. Obvious haze and thin clouds, sky fairly bright around horizon. "An immensely rich tear-drop shaped nebulous patch, with many stars resolved, of 11th magnitude and fainter. Although faint, it is quite well seperated from the background, because of the nebulous appearance."

Magda Streicher

(no date)

(8-inch Meade, 18mm Super-Wide Angle eyepiece, 36' fov)

Large, bright, roundish wide-open appearance of a flower with a center resembles curls turning out from the middle like a rose. To the south stars bundle together to from some more strings and curls. Rich, with mixed magnitude stars. Maybe it narrows down to forms a stem.

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