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RA: 16h 59m 32.68s
Dec: −37° 07′ 17.1″
Ch: MSA:1440, U2:375, SA:22
Ref: SIMBAD, DAML02, SEDS
Type: globular cluster
Mag: B=?, V=11.3
Discovered by Sir John Herschel at the Cape of Good Hope with an 18-inch f/13 speculum telescope. He recorded it as "globular, eF, vL, vglbM, 4' diameter, perceived with the utmost attention to be resolved into vS stars 20th mag." On a second occassion he called it "VI class. A vL neb, or rather vF, R cluster VI. class; vF, irregularly round, vglbM, 4'."
Charlier, C V L (1931) "Stellar clusters and related celestial phaenomena", Lund Annals 2, 14, No. 19. Charlier examined prints from the Franklink-Adams atlas; "Table 6 gives a list of those objects in Bailey's catalogue for which the globular character is uncertain or not probable..."
NGC 6256 Remarks: "not found by Bailey."
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.
(Sulentic and Tifft 1973) notes that this is a globular cluster.
RA 16 59 32.6 (2000) Dec -37 07 17 Integrated V magnitude 11.29 Central surface brightness, V magnitudes per square arcsecond 17.89 Integrated spectral type Central concentration, c = log(r_total/r_core); a 'c' denotes a core-collapsed cluster 2.50c: Core radius in arcmin .02. ["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) ]
1997 March 15. Jonkershoek. 11x80 tripod mounted. No moon. Not found.
16-inch f/10 SCT (127x, 290x)
A soft round haze just like a faint elliptical galaxy. Fainter than 11Magnitude more to 12.5Magnitude just my impression. Could just see this dust patch with averted vision and a few splinter stars with high power. The stars of VdBH 205 can be seen to the north of the globular. The field towards the west and south are bare with starlight.
The Messier objects
The Bennett objects
The Caldwell list
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