Becrux
| catalogues and names | Becrux, b Cru, bet Cru, HR 4853, HD 111123, SAO 240259, 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 (J1900) | 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) | |
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 | -0,26 |
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 |
| 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° | ||
| GCI unit vector (J2000) | X: -0,493796 | Y: -0,104331 | Z: -0,863296 | |
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:
| variability type | 140 |
| var. amplitude | 0,08 |
| var. period | 0,24 |
double/multiple star system information:
| 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 (J1950) | RA: 12h 44min 47,037sec | DEC: -59° 24' 56,53'' | ±0,008 arcsec |
| position (J2000) | RA: 12h 47min 43,293sec | DEC: -59° 41' 19,34'' | |
| proper motion J1950 (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 (J1950) | 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. |