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Lacaille III.3 (5,581 of 18,816)

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Lacaille III.3

Lacaille III.3, IC 2395, Cl Collinder 192, Cl VDBH 47, C 0839-480, C 0841-479, COCD 205, Ced 106m

RA: 08h 42m 31s
Dec: −48° 08′ 12″

Con: Vela
Ch: MSA:965, U2:397, SA:20

Ref: SIMBAD, DAML02, Archinal&Hynes (2003), Corwin (2004)

(reference key)

Type: open cluster, 23m

Mag: B=?, V=4.6

Size: 18.6′
PA: ?

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Sketches  (1)

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Published comments

Bailey, S.I. (1908)

Bailey, S.I. (1908) A catalogue of bright stars and nebulae. Ann.Harv.Coll.Obs., 60(8), 199.

This open cluster was identified by Bailey; he described it only as a "coarse cluster".

Melotte, P.J. (1915)

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

Table, p.177: "Clusters" noted by Bailey but not included in the Catalogue:

"Coarse clustering. Not considered a separate clusters."

Doig, P (1926)

"A Catalogue of Estimated Parallaxes of 112 Nebulae, Open clusters and Star Groups", Vol 36 (4), p 107-115. Has a cluster at 08h38.0m, -47°58' (1900) that is about 27 arcmin across; he callls it "Irregular; fairly bright stars; in centre of triangle formed by lambda, gamma, delta Velorum. Not in NGC."

[Doig's anonymous cluster = vdBH 47 ?]

Trumpler, R.J. (1928)

Trumpler (Lick Obs Bul, Vol 14, No. 420) gives the diameter as 20' and the class as 2 3 p.

Schmitt, W. (1936)

Schmitt, W. (1936) Spektraldurchmusterung des galaktischen Sternhaufens I C 2395. Mit 1 Abbildung. Zeitschrift fur Astrophysik, Vol 12, p 64.

Gives the pos of the cluster 1900 as 08h40.0min, -47° 49' and provides a catalogue of 86 stars in and around the cluster (incl. magnitude and spectral type)

Cederblad, S. (1946) [VII/231]

Ced 106m (IC 2395)

Position (1900): RA 8 40, Dec - 47 49

Star: Cl (Mp=4.6, , SpT=B3, B8)

Spectrum of nebula: (not classified)

Classification: Nebulous cluster (milky neb cover the clusters, eg NGC 1976)

Size: (not given)

Notes: "Ced 106 Melotte's and Lundmark's nebulous region in Vela. R. With the exception of a large detached loop, the nebulosity seems to condense around the individual stars mentioned by Melotte in (502). The whole group should be classified as A. 2. (30). Ced 106 m = The neb. conn. with the cluster IC 2395. R. Compare the Introduction of the present paper (p 13). (194). Bailey (30) does not mention nebulosity in his description of the cluster. However, he has given exactly the same description of M 16, which is certainly nebulous."

Lynga, Gosta (1960)

"UBV sequences in five southern galactic clusters" [http://adsabs.harvard.edu/abs/1960ArA.....2..379L]

"Summary: Photoelectric sequences in the UBV system are determined for the galactic clusters NGC 2422, IC 2391, IC 2395, Tr 10, and NGC 3114 by means of the Rockefeller reflector of the Boyden Observatory in South Africa."

Lynga, Gosta (1962)

"On some southern galactic clusters" [http://adsabs.harvard.edu/abs/1962ArA.....3...65L]

"Summary: Magnitudes and colours are determined for stars in the galactic clusters IC 2391, IC 2395, NGC 2470 [sic], Tr 10, and NGC 3114. Proper motions are used to determine membership in IC 2391 and Tr 10. The cluster properties are discussed."

Reports on an investigation of five southern galactic clusters (IC 2391, IC 2395, NGC 2670, Tr 10 and NGC 3114) which were "observed photoelectrically and photographically by the author during a stay in 1958 at the Boyden Observatory in South Africa." The 35.5-inch ADH Baker-Schmidt telescope was used, and the observers were Lynga, H. Haffner, and Bester.

Hogg, A.R. (1965)

"Cat. of Open Cl. south of -45° Decl.", Mem. 17 Mnt Stromlo Obs.

Cluster probably exceeds diam. assigned here.

Modern observations

Brian Skiff

= vdB-H 47

15cm - br rel sparse cl led by m7 'cen *'. 80x shows 70 *s in 25'x15' area elong ~E-W. nice pair SE side. many m8-10 *s, but fair population of fntr *s too, mildly concen twd cen *. BS, 24Feb1990, LCO.

Contemporary observations

Auke Slotegraaf

2002 July 01

Stellenbosch (Paradyskloof Rifle Range)

11x80 tripod-mounted binoculars (12.5-mm aperture mask)

Conditions: Dark moon. Slight easterly breeze. NELM approx 5.5 at the pole. Dew.

vdB-Ha 47: Bright star with a companion south-southeast, with less than a dozen much fainter stars scattered to the side. 11x12.5 shows the two stars, and haze from the fainter ones.

2002 June 20

2002 June 20, 20:00 SAST

Stellenbosch (Paradyskloof Rifle Range)

11x80 tripod-mounted binoculars.

Conditions: First-quarter moon. Slight easterly breeze.

Working on Uranometria chart 397. b and n Vel point to the location of Lacaille III.3, where I find a ~6th magnitude star [HX Vel] and close south-east, a 7th mag one; further south-west lies another star. In the 11x12mm, I can imagine seeing a nebulous haze around the first two stars. The 11x80mm shows a rich, approximately evenly scattered cluster of stars spread out towards the south-west from HX Vel. It is very obvious with averted vision as a mottled, maybe speckled, roughly triangular glow of similar magnitude stars.

2002 June 20

Searching for Lacaille III.3

(= vdB Ha 47 / IC 2395 ?)

2002 June 20, 20:00. 11x80 tripod-mounted. First-quarter moon. Slight easterly breeze. Working on U 397.

b and n Vel point to the location of Lacaille III.3, where I find a ~6th magnitude star [HX Vel] and close south-east, a 7th mag one; further south-west lies another star.

In the 11x12mm, I can imagine seeing a nebulous haze around the first two stars.

The 11x80mm shows a rich, approximately evenly scattered cluster of stars spread out towards the south-west from HX Vel. It is very obvious with averted vision as a mottled, maybe speckled, roughly triangular glow of similar magnitude stars.

On U397, this grouping is marked as vdB Ha 47, with IC 2395 to the southwest. However, see e.g. the note in BSC5 for HX Vel below.

b Vel (CD–46°4438, BSC5: 3445) has V = 3.84, B-V = +0.71.

n Vel (CD–46°4448, BSC5: 3452) has V = 4.77, B-V = +0.12.

HX Vel (CD–47°4251, BSC5: 3462) has V = 5.5, B-V = –0.18.

Regarding HX Vel, Hoffleit & Warren, in "Preliminary Version of the Bright Star Catalogue, 5th Revised Edition" notes: "In cluster IC 2395 #1; Sco-Cen assoc."

1998-01-31

VDBH 47: 1998-01-31/02-01, Sat/Sun. Unitron 4-inch f/14.7 refractor. Die Boord. Even the 40mm eyepiece at 38x is too much for this cluster, which is well spread-out but still very noticeable. Looks like a trident, or capital Psi, pointing roughly south-west. Stars exhibit a great range in brightness, from one bright, pale yellow member, a dozen lesser lights, and as many faint or very faint ones. There is no concentration, since the stars are arranged in chains (which makes it pleasant to sketch; look for many right-angled triangles). No clearly-defined, insulated, open spaces. One neat double: the bright star at the tip of the southern prong of the trident. The 25 arcmin K18mm frames the cluster well. Sketched in the K18 eyepiece.

1998-01-31

IC 2395: 1998-01-31/02-01, Sat/Sun. Unitron 4-inch f/14.7 refractor. Die Boord. According to the U2 map, has a 8th mag star on the south-west edge; examining this star at various powers, shows nothing more than three small stars in a line.

1995-05-30

VDBH 47: 1995-05-30: 11x80.Technopark. 21:30 SAST. Hazy sky. A loose triangular grouping of about 10 equally bright stars.

1994-03-09

IC 2395: 1994-03-09 22:30 Die Boord. Observing with a 6-inch f/8.6 Newtonian at 52x. Not found! Compare with previous 11x80 observation . . . ?

1994-03-09

VDBH 47: 1994-03-09 22:30 Die Boord. Observing with a 6-inch f/8.6 Newtonian at 52x. Although coarse, the large and small stars of this cluster seem contained within an irregular round space. The dozen or so bright stars are scattered out to 15'.

1994-02-21

VDBH 47: 1994-02-21 03:00 Jonkershoek 11x80 tripod-mounted. This cluster appears as a roughly 12' box-shaped group of bright stars, quite prominent in a rich field.

1991

VDBH 47: A 10-inch f/5 at 30x shows this as a loose gathering of 12 or more stars. The brighter stars are arranged in an elongated rectangle lying northwest to southeast, with a single star on the northwestern tip being considerably bright.

1990

IC 2395: 1990: In 11x80 binoculars, it is quite faint, and is marked by a very bright star directly on its western edge, with a scattering of brighter stars further north. It looks like the binocular version of Tau CMa, because looking directly at the star, the surrounding scattered open cluster is not immediately evident, but the slightest averted vision will show the open cluster trailing away from the bright primary. Very interesting object, because it is most easily seen whilst sweeping the area - you glimpse it out of the corner of your eye, but when you look directly at it, you only see the single bright star until you avert your vision from it.

Magda Streicher

2006 December 21

Pietersburg

16-inch f/10 SCT (102x, 290x)

Conditions: Good

Very busy star field which show a few clumps of stars and several strings. The northern part consist of a few groupings which could be VdBH with the larger group identified as IC 2395. The eastern part of this large combination cluster is marked with a long curved string from north to south. The stars in the middle part is more or less 11-12-magnitude stars.

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