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NGC 5634 (12,437 of 18,816)


oc gc pln bn dn gx gxcl ast aka lost




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NGC 5634

NGC 5634, Cl Melotte 126, C 1427-057, GCl 28, Bennett 66, I 70, h 1813, GC 3900

RA: 14h 29m 37.28s
Dec: −05° 58′ 35.1″

Con: Virgo
Ch: MSA:791, U2:287, SA:14


(reference key)

Type: globular cluster

Mag: B=10.69, V=10.05

Size: 5.5′
PA: ?

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Photos  (2)

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History and Accurate Positions for the NGC/IC Objects (Corwin 2004)

NGC 5634. See NGC 5897.

Historical observations

William Herschel (c.1784)

Synonyms: H I-070

Discovered in 1785 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "vB cL iF vgbM."

Published comments

Van den Bergh & Hagen (1968)

Van den Bergh and Hagen ("UBV photometry of star clusters in the Magellanic Clouds", Astronomical Journal, Vol. 73, 1968) find that the integrated V magnitude through a 60'' diaphragm is 10.38. They classify it as a globular cluster.

Sulentic & Tifft (1973)

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

Harris, W.E. (1997)

RA 14 29 37.3 (2000) Dec -05 58 35 Integrated V magnitude 9.47 Central surface brightness, V magnitudes per square arcsecond 17.49 Integrated spectral type F3/4 Central concentration, c = log(r_total/r_core); a 'c' denotes a core-collapsed cluster 1.60 Core radius in arcmin .21. ["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) ]

Doig, P. (1925)

Doig, P. (1925) Notes on the nebulae and clusters in Webb's 'Celestial Objects for Common Telescopes' (Sixth edition, Vol.ii). Part V. M.N.R.A.S., 36(3), 89.

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.

Union Observatory Circular (1914)

W. M. Worssell, in Union Observatory Circular No 20 (1914), comments on objects seen on photographic plates taken with the Franklin-Adams Star-Camera. He notes: "Great condensed cluster, mag 7."

Helwan Obs. Bulletin No 15 (1915)

! irregular globular cluster, 3' in diameter, almost spiral in its structure, vC in centre.

Helwan Obs. Bulletin No 21 (1920)

Globular cluster rather irregular, not quite resolved in the centre. There are two curved branches of stars that slightly suggest a spiral formation.

Modern observations

Tom Lorenzin

Tom Lorenzin, in the e-version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "10M; 4' diameter; bright and round, unresolved glow with brighter center; 10M star on E edge; fainter star nearby."

Steve Coe

Steve Coe, observing with a 13" f/5.6, notes: "bright, pretty large, not compressed globular cluster among all these galaxies. It is easy to find at 100X. 2 stars are resolved at 175X."

Contemporary observations

Magda Streicher

(no date)

12-inch f/10 SCT (EP: 2-inch 40mm SW 76x 53' fov; 2-inch 32mm SW 95x 42' fov; 2-inch 14mm UW 218x 23' fov)

The one and only bright, medium size globular cluster in Virgo more or less 4'arc minutes in size. Displays a soft star mass glow, growing gradually brighter to the middle but not star like. Towards the eastern edge an 8th magnitude star dominates and together with two dimmer stars to the west this globular gives the impression of a slightly triangular fringy impression (218x). Faint stars outliers on the north and south slightly spiral out into the field of view. A spaced triangle of stars can be seen to the northwest edge of the globular (127x). Egypt observers in 1915 described it as follows: remarkable, irregular globular cluster 3' in diameter, almost spiral in its structure, very compressed in centre. In 1920 they wrote; globular cluster rather irregular not quite resolved in the centre. There are two curved branches of stars that slightly suggest a spiral formation.

2006 July 01


16-inch f/10 SCT (127x, 290x, 462x)

Conditions: Good

Very low surface brightness whit a small just brighter nucleus. Very haze all around the edge. Difficult to estimate the size against the star field although I suspect the size to be correct as indicated. Very interesting star field with various magnitude stars in groups and pairs.

Tom Bryant

2008-07-03 00:00:00

Observing site: Little Tycho Observatory

Telescope: C-8

[14h 29m 36s, -5 59' 0"] This looked smaller than its listed 9 arc minutes. The cluster was well granulated, but not resolved. Tonight's seeing is poor, but the skies are very transparent. There is a light but gusty wind.

2008-03-25 03:00:00

Observing site: Little Tycho Observatory

Telescope: C-8

[14h 29m 36s, -5 59' 0"] Not found in tonight's moon washed skies.

Richard Ford

2015, June, 20th



Sky Conditions:The fainter parts of the Milky Way are barely visible.Haziness only visible on the horizon.Atmosphere stable with little interference.

Instrument:12-inch Dobsonian.

In this globular cluster the stars are unresolved as a result that this cluster looks like a faint mottled snowball.This clusters stars are strongly concentrated towards each other and that the nucleus of this globular cluster is moderately condensed like a faint mist.This globular cluster measures 4'x 3'.Chart No.469,NSOG Vol.2.

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