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RA: 15h 28m 0.44s
Dec: −50° 40′ 22″
Ch: MSA:948, U2:431, SA:21
Ref: SIMBAD, Archinal&Hynes (2003), SEDS
Type: globular cluster
Mag: B=10.13, V=8.86
James Dunlop discovered this object from Paramatta, New South Wales, and included it as No. 389 in his catalogue of 1827. Using a 9-inch f/12 telescope, he recorded it on 8 occasions, describing it as "a very fine round pretty bright nebula, about 3' diameter, gradually brighter towards the centre, and well defined at the margin: this is resolvable. With a power of 260 it has a beautiful globular appearance. The stars are considerably scattered on the south side."
Observed by Sir John Herschel at the Cape of Good Hope with an 18-inch f/13 speculum telescope. He recorded it as "globular, B, L, R, gbM, diam in RA = 16 seconds. Comes up to a bright blaze in middle. Resolved by left eye. Stars 17th mag." On a second occassion he called it "globular, pB, fine highly condensed, vgbM, 3' diameter, clearly resolved. I see all the stars (15th mag) well."
Hinks, A. R. (1911) On the galactic distribution of gaseous nebulae and of star clusters. MNRAS, 71(8), 693-701.
List 6: "NGC numbers of clusters classed as globular, not in Bailey's catalogue"
Bailey, S.I. A catalogue of bright clusters and nebulae. Ann.Harv.Coll.Obs., 60(8), 199.
A catalogue of star clusters shown on Franklin-Adams chart plates. Mem.R.A.S., 60(5), 175-186.
Hardcastle, J.A. (1914) Nebulae seen on the Franklin-Adams plates. MNRAS, 74(8), 699-707. [commentary in Shapley, H. & Ames, A. (1932) A survey of the external galaxies brighter than the thirteenth magnitude.]
Classified as "probably spiral."
Notes: "globular cluster, Dunlop."
The RNGC (Sulentic and Tifft 1973) notes that this is a 9.5 mag globular cluster.
RA 15 28 00.5 (2000) Dec -50 40 22 Integrated V magnitude 8.01 Central surface brightness, V magnitudes per square arcsecond 17.45 Integrated spectral type G2- Central concentration, c = log(r_total/r_core); a 'c' denotes a core-collapsed cluster 1.60 Core radius in arcmin .42. ["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) ]
1998-05-21/22, 6-inch f/8.6 Newtonian, Die Boord. 5.6 Seeing average (air pollution, dew); (lim mag ~ 13.0)
"Moderately large, soft glowing sphere, 3.7' in diameter with a broad centre (about 3' wide). Many small stars dot the surrounding field of view.
1998-04-24/25, 11x80 tripod-mounted binoculars, Die Boord. Seeing average, transparency below average, dew. "F, 7' (max) across, R, nebulous haze, in a very rich field. No distinct division into core/fringe."
1995-05-28: 11x80.Technopark. 20:15 SAST. Hazy sky, thin clouds. Quite a challenging object, considering the sky conditions. With careful searching, cross-pinpointing its position, averted vision shows this elusive cluter as a round, evenly lit faint haze. The large size on the U2000 chart is quite deceptive. It is quite obviouis - as usual - to see once it has been found.
1994-02-23, 00:30, Jonkershoek, 11x80 tripod-mounted, strong moonlight. Strong moonlight and the low altitude combine to almost obliterate this bright globular, leaving only a faint bloated star with little envelope.
1994-02-08, Die Boord, 11x80's tripod-mounted. Observing after loss of dark adaptation, with extra light shielded by a black T-shirt, this globular can be seen easily as a round nebulous patch. The field is quite busy, especially to the south and southeast of the cluster.
30/04/93: Observing with a 6-inch f/8.6 Newtonian at 52x, the field of this globular is well-sprinkled with 9-10th mag stars. In bright moonlight, the cluster is clearly but dimly seen as a R, pL, even glow; not sbM but rather a broad centre. Two very rough drift timings gave 10 seconds = 1.6'.
12-inch f/10 SCT (EP: 2-inch 32mm SW 95x 42' fov; 2-inch 14mm UW 218x 23' fov)
Slightly brighter than NGC 5897, large oval which grows increasingly brighter to a small round compact core. It displays fringy edges with well-defined outliers to the south. It is outstanding in a beautiful busy star field. One of Dunlop's objects which he noted as a very fine round, pretty bright nebula about 3' arc minutes, gradually brighter towards the centre, and well defined at the margin. (Mag 8.0; size 12.0'; brightest stars = 14.5 mag. )
Sky Conditions:The fainter parts of the Milky Way are barely visible.Haziness only visible on the horizon.Atmosphere stable with little interference.
NGC 5927 has the resemblance of an out of focus mottled snowball seen at both 57x and 75x.This globular cluster is seen as an unresolved glow of white light with granularity in the central core of this cluster.The nucleus of NGC 5927 is extremely condensed whereby the stars are arranged in a concentric motion in this object.This globular cluster measures 6.2'x 4.7'.
The Messier objects
The Bennett objects
The Caldwell list
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