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RA: 15h 05m 44.8s
Dec: −55° 37′ 30″
Ch: MSA:968, U2:431, SA:25
Ref: SIMBAD, Collinder (1931), DAML02, Archinal&Hynes (2003)
Type: open cluster, 22r
Mag: B=8.61, V=7.9
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."
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) A research on open clusters. Lund Medd. Astron. Obs. Ser. II, 28, 1.
Discussed, based of F-A plates.
"Cat. of Open Cl. south of -45° Decl.", Mem. 17 Mnt Stromlo Obs.
A catalogue of star clusters shown on Franklin-Adams chart plates. Mem.R.A.S., 60(5), 175-186.
Trumpler (Lick Obs Bul, Vol 14, No. 420) gives the diameter as 10' and the class as 3 2 m.
Sanford notes that this open cluster has "about 80 stars and is appreciated only with a telescope of 12-inch aperture or greater."
The RNGC (Sulentic and Tifft 1973) notes that this is a 8.5 mag open cluster.
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 Vol 24 No 3 June 1971: "small Y-shaped cluster in 4-inch 64x."
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.
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 Sept 03: 11x80 tripod-mounted. 23:00 SAST. Jonkershoek. Like a smaller version of NGC 5822.
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."
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."
(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.
The Messier objects
The Bennett objects
The Caldwell list
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