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RA: 15h 00m 18.57s
Dec: −82° 12′ 49.6″
Ch: MSA:1027, U2:467, SA:25
Ref: SIMBAD, SEDS
Type: globular cluster
Mag: B=?, V=9.8
This globular cluster was discovered by Delisle Stewart on photographic plates taken with the 24-inch Bruce refractor at the Arequipa station of Harvard College Observatory. It is described as: "cluster, very faint, 4' diameter; 2 faint stars in nebulosity?"
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, and notes: "Found at Arequipa by Stewart. Described by Melotte as 'glboaulr cluster of very faint stars.' It is shown on the FAC as a faint nebulosity with a (foreign) star 13m (?) in the middle." He notes that although Melotte calls it a globular, the NGC calls it an ordinary cluster, and it is not named in Bailey's catalogue of globular cluster published in H.A. 76.
A catalogue of star clusters shown on Franklin-Adams chart plates. Mem.R.A.S., 60(5), 175-186.
Sanford calls this "a fairly large but faint globular cluster ... which is an 11th magnitude ball of faint stars about 5 arcminutes in diameter. It can be located just North of Pi 2 Octantis, on the Apus side of the constellation border."
RA 15 00 18.5 (2000) Dec -82 12 49 Integrated V magnitude 9.76 Central surface brightness, V magnitudes per square arcsecond 20.92 Integrated spectral type Central concentration, c = log(r_total/r_core); a 'c' denotes a core-collapsed cluster 1.11 Core radius in arcmin .96. ["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) ]
Hartung notes: "This globular, missed by John Herschel, was discovered photographically from Arequipa. It is a faint irregularly round haze nearly 3' across in a field of rather faint stars, and three very faint stars in it are probably superposed. On a clear dark night it is not difficult for 30cm because of its size, but 20cm is hardly enough."
ASV Journal Vol 24 No 3 June 1971: "requires large telescope."
Alvarado et al. 1994 AJ 107,631: * nr center V=12.53/1.32 (K giant); star off E side V=13.06/1.20 (K dwarf).
15cm - mod f losfcbr gc w/two br *s inv @ 80x. unres here. 140x/195x: 2'.5 diam, not quite reaching m11 * S. m12 * well w/in haze NNE of center. m12.5 * off E side. a handful of threshold *s res + haziness. BS, 24Feb1990, LCO.
RA: 15h00m18s - DEC: -82o13' - Magnitude: 10.1 - Size: 8'
Tel: 12" S/C - 218 - 346x - Date: 14 June 2009 – Vis: 5.6
Seen with ease as a soft round somewhat large round glow nicely lifted out from the star field. However just a few pin point stars can be seen and most of the time with averted vision. A magnitude 9 star can be seen on the globular western side, with a nice double star on its eastern periphery. With higher power the globular show a rather flimsy edge slightly granular, but still not more that 5 stars seen. The core seems somewhat tighter.
12-inch f/10 SCT (95x 218x)
With low magnification the cluster displays a lovely round haze with just a glimpse of a brighter centre. It might be very dense with starlight by the look of it, but sadly I could not resolve any stars although a few faint stars can be seen on the surface which is most probably fore ground stars. The object stands out nicely against the star field 10’ east of a magnitude 9 field star.
1998-04-23/24, 11x80 tripod-mounted binoculars, Die Boord. Seeing good, transparency below average, dew. "Location precisely verified - nothing seen."
The Messier objects
The Bennett objects
The Caldwell list
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