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RA: 17h 38m 36.93s
Dec: −23° 54′ 31.5″
Ch: MSA:1394, U2:338, SA:22
Ref: SIMBAD, SEDS
Type: globular cluster
Mag: B=11.31, V=10.71
Synonyms: H I-044
Discovered in 1784 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "cB pL Has a nucleus."
Observed by Sir John Herschel at the Cape of Good Hope with an 18-inch f/13 speculum telescope. He recorded it as "pB, R, vgbM, 25 arcseconds, a star 13m involved, following the centre." On a second occassion he called it "pB, R, vgbM, 2'; has a star 11m, rather following the middle."
F, pS, an indefinite mass in the preceding side of a small cluster of very faint stars, among which the star mag 12 lies; possibly only a denser poriton of the cluster and not nebulous. Scheiner gives its spectrum as gaseous without reference to authority. It is very fain to have been observed spectroscopically, but if nebulous it is from its appearance probably gaseous.
Sparse cluster of f stars 3' in diameter much condensed at centre, rich field of f. stars.
Ced 149 (NGC 6401)
Position (1900): RA 17 32.5, Dec - 23 51
Star: Anon (Mp=12.5:, V=12.8:)
Spectrum of nebula: (not classified)
Classification: Neb associated with mainly one star (which may be multiple) - star surrounded by a neb envelope without conspicuous structure (eg. lambda Scorpii)
Notes: "NGC 6401 = GC 4314 = h 1982 = h 3697 = H I 44. Disc. 1784. (93 Pl 21, 114). R. The nebula has also been listed as -23 13481."
The RNGC (Sulentic and Tifft 1973) notes that this is a globular cluster.
RA 17 38 36.9 (2000) Dec -23 54 32 Integrated V magnitude 9.45 Central surface brightness, V magnitudes per square arcsecond 18.67 Integrated spectral type F9 Central concentration, c = log(r_total/r_core); a 'c' denotes a core-collapsed cluster 1.69 Core radius in arcmin .25. ["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) ]
Tom Lorenzin, in the e-version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "11M; 1' diameter; bright and round with little brighter center; unresolved; 13M star 7" SE of core."
Steve Coe, using a 13" f/5.6, notes: " Pretty bright, pretty small, little brighter in the middle and very grainy at 220X. There is an 11th mag star on the east side. The cluster grows with averted vision and two stars are resolved across the face of this globular."
Observing site: Pinnacles overlook
[17h 38m 36s, -23° 55' 0"] A faint cluster, very close to the horizon. Tonight's seeing is terrible, there is a wind gusting to 15mph. I could not resolve any stars. There is a 10mv foreground star (HD 160023) on the cluster's SE edge. It is unlikely I would have resolved it anyway, as the brightest stars come in at 16 mv.
The Messier objects
The Bennett objects
The Caldwell list
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