catalogues and names

The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version)

SKY2000 - Master Star Catalog

Smithsonian Astrophysical Observatory Star Catalog

The Washington Visual Double Star Catalog, 1996.0

Combined General Catalogue of Variable Stars (Vol. I-III)

catalogues and names

catalogues and names	Becrux, b Cru, bet Cru, HR 4853, HD 111123, SAO 240259, CP -59 4451, FK5: 481, WDS 12477-5941A
other names	Mimosa
constellation	Crux

data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)

note (category: star names):

Becrux; MIMOSA.

position, motion, parallax:

position (J2000)	RA: 12h 47min 43.2sec	DEC: -59° 41' 19''
position (2000.72)	RA: 12h 47min 46sec	DEC: -59° 41' 33''
position (B1900)	RA: 12h 41min 52.5sec	DEC: -59° 8' 31''
proper motion (J2000)	RA: -0.048 arcsec/a	DEC: -0.014 arcsec/a
radial velocity	16 km/s note: spectroscopic binaries
rotational velocity	38 km/s (uncertain) (variable)
galactic coordinates	longitude: 302.46°	latitude: 3.18°

magnitude

visual magnitude

1.25 (V on UBV Johnson system)

spectral / color information

spectral class	B0.5III
B-V-magnitude	-0.23
U-B-magnitude	-1
R-I-magnitude

variability information

variable star identification

Bet Cru

note (category: variability):

Beta C 1.23 - 1.31V, multiple periods, 0.2365072d, 0.160474d, 0.121383d, 6d, 7 - 8y and others.

double/multiple star system information

number of components of multiple star system	3
separation	371.6 arcsec
mag difference (of double or brightest multiple)	6
component ID	AC
note	Worley (1978) update of the IDS

note (category: double and multiple data):

Interferometer measures indicate close double or multiple star. Component B, 11.4v, F8V, optical; C, 7.5v, B8.

note (category: spectroscopic binaries):

0.1604d, and 7 - 8y.

miscellaneous information

note (category: group membership):

Probable member of Sco-Cen cluster; member of Sco-Cen assoc.; member of Pleiades group.

note (category: stellar radii or diameters):

Diam. = 0.000702 - 0.000722".

data from SKY2000 - Master Star Catalog (Myers+ 1997)

position, motion, parallax:

position (J2000)	RA: 12h 47min 43.237sec	DEC: -59° 41' 19.46''	±0.06 arcsec	source: 15
position (2000.72)	RA: 12h 47min 46sec	DEC: -59° 41' 33''	JD: 2451809.16
proper motion (J2000)	RA: -0.0063 arcsec/a	DEC: -0.014 arcsec/a		source: 25
radial velocity	16 km/s			source: 25
galactic coord. (B1950)	longitude: 302.47°	latitude: 3.18°

magnitude:

visual	1.23 (observed)	source: 30
photovisual	1.5	source: 2
photographic	1.3	source: 2

spectral information:

spectral class	B1		source: 96
Morgan-Keenan	B0.5III		source: 25
B-magnitude	1.02 ±0.05	B-V-magnitude	-0.23
U-magnitude	0.02 ±0.05	U-B-magnitude	-1

variability information:

source of data: 30

variability type	140
var. amplitude	0.08
var. period	0.24

double/multiple star system information:

source of data: 19

separation between brightest and second brightest component	44.3 arcsec
magnitude difference between brightest and second brightest component	10.1
position angle	322 °

sources:

2	HD and HDE Catalogs
Cannon, A.J., and E.C. Pickering, Harvard Annals, Vols 91-99, 1918-24, Cambridge, Massachusetts: Harvard University; Cannon, A.J., Harvard Annals, Vol. 100, 1925-36, Cambridge, Massachusetts: Harvard University; and Cannon, A.J., and M. Walton Mayall, Harvard Annals, Vol. 112, 1949, Cambridge, Massachusetts: Harvard University
15	FK5, FK5 Extension and FK5 Supplement
Fricke, W., H. Schwan and T. Lederle, "Fifth Fundamental Catalogue (FK5), Part I. The Basic Fundamental Stars," Veroff. Astronomisches Recheninstitut, No. 32, Heidelberg, Germany, 1988, and Fricke, W., H. Schwan, and T.E. Corbin, "Fifth Fundamental Catalogue (FK5), Part II. The FK5 Extension," Veröff. Astronomisches Recheninstitut, No. 33, Heidelberg, Germany, 1991
19	WDS Catalog
Worley, C.E., and G.G. Douglass, Washington Catalog of Visual Double Stars 1996.0, United States Naval Observatory, 1996
25	Bright Star Catalogue, 5th edition
Hoffleit, D. and Warren, W.H. Jr., The Bright Star Catalogue, 5th Revised Edition, Version 2, 1994
30	GCVS, 4th edition
Kholopov, P.N., et al., General Catalogue of Variable Stars, fourth edition, Moscow: Nauka Publishing House, 1985-88
96	SAO or HD/HDE Catalog
Reference from Value 1 or Reference from Value 2

data from Smithsonian Astrophysical Observatory Star Catalog (SAO Staff 1966; USNO, ADC 1990)

position and proper motion:

position (B1950)	RA: 12h 44min 47.037sec	DEC: -59° 24' 56.53''	±0.008 arcsec
position (2000.72)	RA: 12h 47min 46sec	DEC: -59° 41' 33''	JD: 2451809.16
position (J2000)	RA: 12h 47min 43.293sec	DEC: -59° 41' 19.34''
proper motion B1950 (FK4)	RA: -0.005 arcsec/a	DEC: -0.017 arcsec/a	±0.002 arcsec/a in RA ±0.002 arcsec/a in DEC
proper motion J2000 (FK5)	RA: -0.0056 arcsec/a	DEC: -0.012 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	1.5 (accuracy: 2 decimals)
source of visual magnitude data	Taken from the "Henry Draper Catalogue".

spectral information:

spectral class	B1
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue	FK4, catalogue number: 481
Durchmusterung	CP-59 4451
Boss General Catalogue	17374
Henry Draper Catalogue	111123

data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)

position and proper motion:

position (J2000)	RA: 12h 47.7min	DEC: -59° 41'
proper motion (J2000)	RA: -0.048 arcsec/a	DEC: -0.014 arcsec/a

double/multiple star system information:

component	year	number of measures	position angle	angular separation	magnitude of 1st component	magnitude of 2nd component	spectral class(es)	discoverer code
AB	1901	1	322°	44.3''	1.25	11.4	B0.5III	I 362
AC	1853	1	23°	369.9''	1.25	7.5	B7II	DUN 125

discoverer information:

discoverer code	discoverer	reference
I 362	Innes, R.T.A.	-
DUN 125	Dunlop, J.	-

notes:

note	Beta Cru. A is a Beta CMa-type variable.

data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)

position:

position (equinox 1950.0)

RA: 12h 44min 47sec

DEC: -59° 24' 57''

variability informations:

variability type	BCEP	pulsating variable star
magnitute at max. brightness	1.23
magnitute at min. brightness	1.31
photometric system	visual, photovisual or Johnson's V
period [d]	0.2365072

spectral information

spectral class

B0.5III-IV

references

to a study	Vol. I GCVS (see Kholopov et al. 1985-1988)
to a chart/photograph	Vol. I GCVS (see Kholopov et al. 1985-1988)

miscanellous

ID in the GCVS catalogue	30/9002
constellation	Crux
notes on existence	The star is equivalent to '0309004 del'.
There are notes in published catalog.

variability type description

variability type

description

BCEP

Variables of the Beta Cephei type (Beta Cep, Beta CMa), which are pulsating O8-B6 I-V stars with periods of light and radial-velocity variations in the range of 0.1 - 0.6 days and light amplitudes from 0.01 to 0.3 mag in V. The light curves are similar in shape to average radial-velocity curves but lag in phase by a quarter of the period, so that maximum brightness corresponds to maximum contraction, i.e., to minimum stellar radius. The majority of these stars probably show radial pulsations, but some (V649 Per) display nonradial pulsations; multiperiodicity is characteristic of many of these stars.