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Lacaille I.4 (10,757 of 18,816)

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Lacaille I.4

Lacaille I.4, Dunlop 164, NGC 4833, Cl Melotte 115, GCl 21, C 1256-706, Bennett 56, Caldwell 105, h 3444, GC 3325

RA: 12h 59m 34.98s
Dec: −70° 52′ 28.6″

Con: Musca
Ch: MSA:1012, U2:451, SA:25

Ref: SIMBAD, SEDS

(reference key)

Type: globular cluster

Mag: B=8.72, V=7.79

Size: 14′
PA: ?

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Sketches  (1)

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Photos  (1)

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Historical observations

Lacaille (1755)

This globular was discovered by Lacaille and included in his 1755 catalogue as Class I No. 14, classifying it as a nebula. In his half-an-inch 8x telescope he saw it as "a small faint comet."

Dunlop, James (1827)

James Dunlop observed it from Paramatta, New South Wales, and included it as No. 164 in his catalogue of 1827. Using a 9-inch f/12 telescope, he described it as "a pretty bright round nebula, about 4' diameter, moderately condensed to the centre. This, with the sweeping power, has the appearance of a globe of numerous matter with very small stars in the north following margin. But with a power sufficient to resolve it, the globular appearance vanishes in a very conciderable degree; and the brightest and most condensed part is to the preceding side of the centre, with the stars considerably scattered on the N.f. side. Resolvable into stars of mixt small magnitudes. A small nebula precedes this." He observed the cluster on 5 occasions.

John Herschel (1847) Cape Observations

Observed by Sir John Herschel at the Cape of Good Hope with an 18-inch f/13 speculum telescope. He recorded it as "globular, B, L, R, gbM, stars 14th mag, and one 7th mag N.p. the centre; a fine object." On a second occassion he called it "globular, pB, L, p rich, at first gradually, then vspmbM; diameter of the bright part 3', of the loose stars 10'; stars 12..16th mag, and one large one 7th mag, 3' or 4' north of the centre."

Published comments

Harris, W.E. (1997)

RA 12 59 35.0 (2000) Dec -70 52 29 Integrated V magnitude 6.91 Central surface brightness, V magnitudes per square arcsecond 18.45 Integrated spectral type F3 Central concentration, c = log(r_total/r_core); a 'c' denotes a core-collapsed cluster 1.25 Core radius in arcmin 1.00. ["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 8.5 mag globular cluster.

Bailey, S.I. (1908)

"! globular cluster, fiarly condensed"

Bailey, S.I. (1908) A catalogue of bright stars 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.

Modern observations

ASV Journal (1971)

ASV Journal Vol 24 No 3 June 1971: "easy in 4-inch 64x."

Brian Skiff

A&ASuppl 13,287; AJ 82,620; MNRAS 156,207

br * = HD112622, V=8.75/0.30. sev br *s in N side with V ~12.5.

15cm - fine mod lg cl w/m8 * due N of center, partially res @ 80x. 195x: 8' diam, core 3' across, br * 2'.5 N of center. wk even concen. sev of brtst *s (m12-12.5) on N border of core. nicely res @ 195x. BS, 24Feb1990, LCO.

Contemporary observations

Auke Slotegraaf

1982

This cluster is easy in 11x80 binoculars, lying north and slightly west of the yellowish Delta Muscae. The cluster contrasts well with NGC 4372 some 3 degrees west.

1982

This globular cluster in Musca, viewed with a 15.5-inch telescope, appears very loose and well spread out, star-poor with faint stars resolved at the centre. The bright star shown on the SAO Chart lies to the northwest.

1994 February 23

1994-02-23, 00:30, Jonkershoek, 11x80 tripod-mounted, strong moonlight. This cluster and the involved star can be seen easily in strong moonlight.

Magda Streicher

1997 April 5

Location: Campsite (23 16 South 29 26 East)

Sky conditions: 7 magnitude clear.

Instrument: Meade 8" (Super wide angle 18mm eyepiece)

A faint small compact globular cluster gradually brighter to the middle. The one side more gaseous and to the edges some faint outliers. Few pinpoint stars in the field.

(no date)

8-inch f/10 SCT (EP: 1.25-inch 26mm SP 77x 41' fov; 1.25-inch 18mm SW 111x 36' fov)

A faint small compact globular cluster gradually brightens towards the core. Appears well spread out with faint stars. It is slightly condensed and gaseous in the western part. The rather broad compact core overwhelmed the cluster (111x). Yellow Delta Muscae can be seen 40' arc minutes to the southwest, and an 8.7 magnitude star in the outer fringes to the north inside this cluster. Faint outliers visible with hints of dark lanes more so in the western fringes of the cluster. Discovered by Lacaille and included in his 1755 catalogue.

Carol Botha

2007 March 17

Date: 2007 03 17, 20:10

Location: Betty's Bay

Instrument: 8-inch Dobsonian, 25mm eyepiece

Sky: clear bank of cloud to far south.

Notes: Globular cluster. Small fuzzy ball, slightly denser nucleus. Bright star to the east. With higher magnification I could see some graininess but could not resolve any stars in the core.

Richard Ford

2015, February, 23rd

Location:Perdeberg.

Time:2:10am.

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.

NGC 4888 has the resemblance of a faint mottled snowball and that the stars in this cluster are partially.The stars in this cluster is relatively condensed and that the nucleus of this globular cluster is slightly compact.This globular cluster measures 9.7'x 7.4.Chart No.248,NSOG Vol.3.

2010 February 02, Tuesday

Location: Koornlandskloof

Time: 23:23

Telescope:

Limiting magnitude:

Sky conditions:

2010 August 7, Saturday

Location:Kambro Padstal, Britstown.

Instrument: 12" Dobsonian Reflector Telescope.

Sky Conditions: Dark moon and stars magnitude and fainter are barely visible with the naked eye.

Transparency of the Sky: The most clear sky possible.

Seeing: Excellent clean sky, limited star flickering and brilliant objects.

Limiting Magnitude: 6.5.

First Impression: Globular Cluster.

Location: Musca.

Time: 8:30pm.

Chart Number: No.20(Extract taken out of "Atlas of the Night Sky").

Size:26mm Eyepiece: Field of View: 57/9=6.3'.

20mm Eyepiece: Field of View: 50/8=6.2'.

6.3'+6.2'=12.5'.

12.5'/2=6.2'.

Size in Arc Minutes:6.2'.

Size of nucleus vs. halo: 9/6.2'=1.4'.

8/6.2'=1.2'.

1.4'+1.2'=2.6'.

2.6'/2=1.3'.

Size of halo: 1.3'.

Ratio:1:3.

Major Axis:6.2'.

6.2'/3=2.0'.

Minor Axis:2.0'.

Globular Cluster is 6.2'*2.0'.

Brightness:Bright.

Brightness Profile:Medium Surface Brightness.

Challenge Rating: Easy to observe in a dark sky with a large telescope.

Description

-----------

All the individual stars in this globular cluster has a granular appearance where some of the stars is spherically concentrated towards each other. A small clump of stars which is observed as a small chain of stars is resolved. By observing this globular cluster I have found on the central outskirts of this cluster there are some starless patches.

2009 March 21

Perdeberg

12-inch Dobsonian f5 (EP: 20mm UW, 7mm UW)

Conditions: The fainter parts of the Milky Way are barely visible. Haziness only visible on the horizon. Atmosphere stable with little interference. Limiting Magnitude: 4.9.

NGC 4833 is a very bright globular cluster, oval in shape, and appears as a mottled snowball. It is easy to observe in dark skies and is well resolved into individual stars. The stars are centrally concentrated towards other each other in this cluster. On the outskirts of this cluster bright individual stars are radiating slightly away from each other. Chains of stars are centrally concentrated slightly towards each other, and there are some areas of starless patches. The nucleus measures 15' and the halo measures 8'.

Kerneels Mulder

2010 July 01, Thursday

Location:Prince Albert, South Africa

Time: 20:00

Telescope: Skywatcher 6" Dob

Sky conditions: Seeing: 3/5 , Transparency: Good

Small globular cluster. Easy to find.

At 48x: Slightly brighter core fades gradually to edges. With averted vision some faint stars are barely resolved in the globular cluster itself. 1 bright star to the N and 2 fainter stars to the S.

120x: Stars easier to resolve. Estimate visual size of the core at around 5'. Approximately 40 faint stars resolved and easily counted in globular cluster.

Favourite lists

Lacaille's catalogue

The Messier objects

Dunlop's catalogue

The Bennett objects

The Caldwell list

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