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NGC 5946 (13,147 of 18,816)

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NGC 5946

NGC 5946, IC 4550, Cl Melotte 135, Cl VDBH 175, GCl 36, C 1531-504, h 3607, GC 4108

RA: 15h 35m 28.58s
Dec: −50° 39′ 35″

Con: Norma
Ch: MSA:948, U2:432, SA:21

Ref: SIMBAD, Corwin, Archinal&Hynes (2003), SEDS

(reference key)

Type: globular cluster

Mag: B=?, V=8.4

Size: 3′
PA: ?

Historical observations

John Herschel (1847) Cape Observations

Discovered by Sir John Herschel at the Cape of Good Hope with an 18-inch f/13 speculum telescope. He recorded it as "not vB, S, glbM, 90 arcseconds, resolved into stars 16th mag, with one of 12th mag, at or a little beyond the S.p. edge." On a second occassion he called it "pB, R, vgbM, 1', a faint star involved."

Published comments

Shapley, H. (1930) "Star Clusters" Harvard Obs. Monographs No. 2

Included in a list of doubtful objects;. A small poor loose cluster in a rich region.

Hinks, A.R. (1911)

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.

Melotte, P.J. (1915)

A catalogue of star clusters shown on Franklin-Adams chart plates. Mem.R.A.S., 60(5), 175-186.

Charlier, C.V.L. (1931)

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 5946 Remarks: "pB, vmb M, globular, hazy star"

Harris, W.E. (1997)

RA 15 35 28.5 (2000) Dec -50 39 34 Integrated V magnitude 9.61 Central surface brightness, V magnitudes per square arcsecond 17.42 Integrated spectral type F7/8 Central concentration, c = log(r_total/r_core); a 'c' denotes a core-collapsed cluster 2.50c: Core radius in arcmin .08. ["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) ]

Sulentic & Tifft (1973)

The RNGC (Sulentic and Tifft 1973) notes that this is a 11.0 mag globular cluster.

Modern observations

Bahr-Vollrath, Gerd (1992)

Gerd Bahr-Vollrath (Noosa Heads, Queensland, Australia) observing with an 8-inch f/12 SCT, writes in the The Webb Society Nebulae and Clusters Section Report No. 10, July 1992: "Fairly small and faint round glow. The distinct core appears mottled and irregular. Not resolved."

Brian Skiff

AJ88,404: * SW 31" V=11.90/0.44.

15cm - much smlr & fntr cl compared to N5927 just W in Lup, cf. m12 * on SW.

195x: m12 * w/in halo, which is 1'.5 diam. somewhat [word omitted in

logbook?] around the mod-sharp concen core, and perhaps a few *s at

threshold. BS, 26Feb1990, LCO.

Contemporary observations

Auke Slotegraaf

1993 April 30

30/04/93: Observing with a 6-inch f/8.6 Newtonian at 72x, this globular is ill-seen in bright moonlight. It was found using averted vision and then held directly, appearing as a vF nebulous patch. There is an irregular curved chain of 9-10th mag stars to the south.

1994 March 15

1994-03-15 Die Boord, 6-inch f/8.6 Newtonian, seeing good. Noticed this globular as a fuzzy while sweeping for it at 52x. It lies in a rich field, and appears as an irregularly round, mottled nebulous patch. 108x clearly shows a 10-11th mag star on the southwest edge of the round cluster. This star is very bright, compared to the stars of the cluster itself.

1998 May 21

1998-05-21/22, 6-inch f/8.6 Newtonian, Die Boord. 5.6 Seeing average (air pollution, dew); (lim mag ~ 13.0)

Moderately faint cluster, about 70'' across, grows gradually brighter to the middle to a broad nucleus 50'' across. Has an 11th magnitude star on the west-southwest fringe; there's perhaps another, fainter, one on the WNW?? This impression is not confirmed at higher powers. A reasonably difficult object in a field with numerous little stars.

Magda Streicher

2010 April 14

Location: Polokwane

16-inch f/10 SCT (184x 290x)

This globular is slightly elongated in a south-north direction, cover with an uneven haze. There is no bright core the mist seems to be all over the globular with only a few pin-point stars seen with averted vision. An outstanding magnitude 9 star situated on the north-east edge draw the eye. The star field along the south-eastern side of the globular is quite busy with faint stars.

29 April 2009

RA: 15h35m30s - DEC: -50o40'00" - Magnitude: 8.4 - Size: 3'

Tel: 16" S/C - 290x - Date: 29 April 2009 Polokwane Vis 5.2+-

Easy seen in a very busy field of view. The core is very compressed and ease off in a haze towards the edge. The periphery is irregular with star light with fainter stars just off the edge. The north western edge of the cluster displays less starlight. A brighter 9.2 star is prominent just to the east of the cluster.

Favourite lists

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