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RA: 15h 46m 3.44s
Dec: −37° 47′ 10.1″
Ch: MSA:905, U2:374, SA:21
Ref: SIMBAD, Archinal&Hynes (2003), SEDS
Type: globular cluster
Mag: B=?, V=7.6
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James Dunlop discovered this object from Paramatta, New South Wales, and included it as No. 552 in his catalogue of 1827. Using a 9-inch f/12 telescope, he described it as "a beautiful round pretty bright nebula, about 2' diameter, pretty well defined."
Observed by Sir John Herschel at the Cape of Good Hope with an 18-inch f/13 speculum telescope. He recorded it as "globular, vB, R, vgbM, diam in RA 10 seconds; all stars; a star 10th mag follows centre four seconds, and is involved; three stars 13th mag in middle." On a second occassion he called it "globular, fine object, pgbM, diam 15 seconds, composed to distinct stars 13..15th mag, one star 10th mag is eccentric, and 3 of 13th mag in centre nearly."
"! globular cluster, fairly condensed"
Bailey, S.I. (1908) A catalogue of bright stars and nebulae. Ann.Harv.Coll.Obs., 60(8), 199.
RA 15 46 03.5 (2000) Dec -37 47 10 Integrated V magnitude 7.52 Central surface brightness, V magnitudes per square arcsecond 17.56 Integrated spectral type F5 Central concentration, c = log(r_total/r_core); a 'c' denotes a core-collapsed cluster 1.22 Core radius in arcmin .63. ["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) ]
A catalogue of star clusters shown on Franklin-Adams chart plates. Mem.R.A.S., 60(5), 175-186.
The RNGC (Sulentic and Tifft 1973) notes that this is a 8.5 mag globular cluster.
Houston notes that this globular "is about 10' in diameter and bright at 7th magnitude ... I have seen it with the 4-inch Clark, and some of its stars can be resolved with a 6-inch."
Tom Lorenzin, in the e-version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "8M; 5' diameter; fairly large, bright and round with brighter center; barely resolved into a few 13M stars against diffuse background glow."
Steve Coe, observing with a 17.5" f/4.5 at 100X, notes: "Pretty bright, pretty large, elongated, arrowhead shape, resolved at 135X, with a pretty bright star at the edge.
8-inch Newtonian, 66x: 1995-06-19 "A prominent globular cluster at 33x. The nucleus is big and it is surrounded by a faint halo. Two stars, one in the north-following halo border, and a faint one in the north-preceding nucleus border, are seen, but occasionally they disappear. Estimated size 3' to 4' in diameter." [Gabriel Giust, San Isidro, Argentina]
1998-04-24/25, 11x80 tripod-mounted binoculars, Die Boord. Seeing average, transparency below average, dew. "pB, 1' across, R, without a nucleus; a hazy disk with a narrow fringe. Easy to see; located between two bright stars, one of which is h Lup."
12-inch f/10 SCT
Bright, relatively large beautiful globular cluster, forming a soft enveloped around a bright core. Stars well resolved towards the edges with a slightly elongated feeling (218x). Northwest on the edge of the field of view an 8.6 white star can be seen. The very busy star field displays a few bright stars in pairs. (Mag 7.5; size 9.8'; brightest stars = 13.2 mag. )
16-inch f/10 SCT (127x, 290x, 462x)
A third from east to the outside of the globular I could see a string of stars sort of divide the globular and starlight is broken down as seen from this side. On the other hand the globular spray more out with granular haze towards the NW.
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 cluster has the shape of a bright snowball and that the stars in NGC 5986 is moderately condensed and that the nucleus of this cluster is very strongly condensed.In overall this globular cluster is slightly loosely concentrated sprinkling 9th to 10th magnitude stars from the nucleus of this cluster.This globular cluster measures 5.7'x 4.3'Chart No.269,NSOG Vol.2.
Instrument:12-Inch Dobsonian Reflector Telescope.
Sky Conditions:The fainter parts of the Milky Way are barely visible.
Transparency Of the Sky:Haziness only visible on the horizon.
Seeing:Atmosphere stable with little interference.
This globular cluster looks compact and all the stars in this cluster are well resolved where bright individual stars are seen in this cluster.The nucleus of this cluster however is centrally concentrated.The nucleus of this globular cluster grows brighter compared to the stars on the far outskirts of this cluster.
It measures 6.4'* 2.1'.
Challenge Rating:Moderately Easy.
Observer: Carol Botha
Location: Betty’s Bay
Instrument: 12 inch Dobsonian F5. Eyepiece: 25mm plossl (x 60 fov 50') 8mm uwa (x180 fov 22')
Limiting mag: 5.66 6 Corvus
Dimension: 9.8' x 9.8' (Cartes du Ciel)
Globular Cluster in Lupus
Viewfinder (fov 5°): Very few stars visible but the smudge of the globular cluster clearly visible
25mm: Looks like a ball of loose cotton wool and even brightness. The object lies inside a triangle of very dim stars, which in turn is framed by a triangle of bright stars on the edge of fov
8mm: The stars seem to resolve at the edges giving the globular a straggly appearance.
The Messier objects
The Bennett objects
The Caldwell list
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