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RA: 15h 03m 58.5s
Dec: −33° 04′ 4″
Ch: MSA:907, U2:373, SA:21
Ref: NGC/IC, Archinal&Hynes (2003), SEDS
Type: globular cluster
Mag: B=9.1, V=9.09
The 9th mag globular cluster was discovered by E. E. Barnard using a 6-inch refractor at Nashville, Tennessee and described as a nebula with a stellar nucleus.
In September 1883 W.H. Finlay used the 6-inch refractor at the Royal Observatory, Cape of Good Hope, to observe the cluster which he described as a "bright small nebula".
Union Observatory Circulars, Nos. 45-76, p328. R T Innes writes: "This was discovered by Barnard, and the summary description is "pB, S, stell, N" It is CPD -32°3780 mag 9.4 and is also in the Cor. D.M., wherein it is marked 'neb'. In the 26.5-inch refractor is has almost exactly the appearance of NGC 104, as seen in a small telescope. It is a vey condensed globular cluster, its outliers resolved into stars."
Van den Bergh and Hagen ("UBV photometry of star clusters in the Magellanic Clouds", Astronomical Journal, Vol. 73, 1968) find that the integrated V magnitude through a 60'' diaphragm is 9.47. Through a 30'' diaphragm V = 9.80.
The RNGC (Sulentic and Tifft 1973) notes that this is a 10.0 mag globular cluster.
RA 15 03 58.5 (2000) Dec -33 04 04 Integrated V magnitude 9.09 Central surface brightness, V magnitudes per square arcsecond 15.08 Integrated spectral type F4 Central concentration, c = log(r_total/r_core); a 'c' denotes a core-collapsed cluster 2.45 Core radius in arcmin .05. ["Catalog Of Parameters For Milky Way Globular Clusters", compiled by William E. Harris, McMaster University. (Revised: May 15, 1997; from http://www.physics.mcmaster.ca/Globular.html; Harris, W.E. 1996, AJ, 112, 1487) ]
Houston writes that this globular "is about 6' across and at 9th mag is easy to find. Surprisingly, it was discovered by E E Barnard in a region well combed previously by the Herschels and others. The core of NGC 5824 is almost stellar in appearance."
Tom Lorenzin, in the e-version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "9.5M; 3' diameter; small, unresolved glow with very highly compressed central region; overall brightness fairly high; 25' SSE of bright star 5.5M SAO 206239."
Steve Coe, observing with a 17.5" f/4.5 at 100X, notes: "Pretty bright, pretty small, round, very bright core, not resolved at any magnification up to 200X.
12-inch f/10 SCT (EP: 2-inch 32mm SW 95x 42' fov; 2-inch 14mm UW 218x 23' fov)
Small and relatively bright, growing gradually brighter to a much brighter nearly star like core, with a slightly soft envelope around the middle, changing to a soft haze. The tight core roughly covers one third of the globular (218x). Easily visible, it reminds me of a streetlight on a wet and misty night. No stars are revealed, although the edges become faintly granular with just a few faint stars visible (218x). Immediately around this globular the field is rather bare. It was missed by John Herschel and picked up by Barnard who called it a nebula with a stellar nucleus. (Mag 7.8; size 6.2'; brightest star 15.5 mag.)
Sky Conditions:The fainter parts of the Milky Way are barely visible.Haziness only visible on the horizon.Atmosphere stable with little interference.
This globular clusters core has the resemblance of a frozen snowball and that this objects stars are unresolved which looks exactly like a misty haze.The central core of NGC 5824 is fairly condensed and that the stars in this cluster are strongly concentrated towards each other.This globular cluster measures 3.3'x 2.7'.
The Messier objects
The Bennett objects
The Caldwell list
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