l Crucis
catalogues and names
| catalogues and names | l Cru, lam Cru, HR 4897, HD 112078, SAO 240368, CP -58 4584 |
| constellation | Crux |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 12h 54min 39.2sec | DEC: -59° 8' 48'' | ||
| position (2000.72) | RA: 12h 54min 42sec | DEC: -59° 9' 2'' | ||
| position (B1900) | RA: 12h 48min 42.7sec | DEC: -58° 36' 12'' | ||
| proper motion (J2000) | RA: -0.036 arcsec/a | DEC: -0.01 arcsec/a | ||
| radial velocity | 12 km/s | |||
| rotational velocity | 317 km/s (uncertain) (variable) | |||
| galactic coordinates | longitude: 303.35° | latitude: 3.72° | ||
magnitude
| visual magnitude | 4.62 (V on UBV Johnson system) |
spectral / color information
| spectral class | B4Vne |
| B-V-magnitude | -0.15 |
| U-B-magnitude | -0.61 |
| R-I-magnitude |
variability information
| variable star identification | Lam Cru |
| note (category: variability): | Beta C?, amp. 0.02V, 0.3951d, possible secondary 0.1793d. |
miscellaneous information
| note (category: group membership): | Sco-Cen cluster; member of the local association (Pleiades group). |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 12h 54min 39.214sec | DEC: -59° 8' 48.04'' | ±0.19 arcsec | source: 16 |
| position (2000.72) | RA: 12h 54min 42sec | DEC: -59° 9' 2'' | JD: 2451809.23 | |
| proper motion (J2000) | RA: -0.0028 arcsec/a | DEC: -0.013 arcsec/a | source: 25 | |
| radial velocity | 12 km/s | source: 25 | ||
| galactic coord. (B1950) | longitude: 303.35° | latitude: 3.72° | ||
magnitude:
| visual | 4.62 (observed) | source: 25 |
| photovisual | 4.8 | source: 16 |
| photographic | 4.7 | source: 2 |
spectral information:
| spectral class | B3 | source: 96 | |
| Morgan-Keenan | B4Vne | source: 25 | |
| B-magnitude | 4.47 ±0.05 | B-V-magnitude | -0.15 |
| U-magnitude | 3.86 ±0.05 | U-B-magnitude | -0.61 |
variability information:
| variability type | 140 |
| var. amplitude | 0.02 |
| var. period | 0.4 |
| var. epoch | 2441779 6. April 1973, 12:00:00 UT |
| next max light | 2451809.4 21. September 2000, 21:36:00 UT |
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 | |
| 16 | PPM North and PPM South Catalogs and PPM Supplement |
| Roser, S., and U. Bastian, "Catalogue of Positions and Proper Motions," A&AS, Vol. 74, p. 449, 1988, and Bastian, U., et al., "Catalogue of Positions and Proper Motions - South," 1993 | |
| 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 51min 40.057sec | DEC: -58° 52' 31.38'' | ±0.032 arcsec |
| position (2000.72) | RA: 12h 54min 42sec | DEC: -59° 9' 0'' | JD: 2451809.23 |
| position (J2000) | RA: 12h 54min 39.152sec | DEC: -59° 8' 47.54'' | |
| proper motion B1950 (FK4) | RA: -0.0041 arcsec/a | DEC: -0.014 arcsec/a | ±0.009 arcsec/a in RA ±0.006 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0.0047 arcsec/a | DEC: -0.01 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 4.8 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | B3 |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | GC, catalogue number: 17514 |
| Durchmusterung | CP-58 4584 |
| Boss General Catalogue | 17514 |
| Henry Draper Catalogue | 112078 |
data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)
position:
| position (equinox 1950.0) | RA: 12h 51min 40.1sec | DEC: -58° 52' 31'' |
variability informations:
| variability type | BCEP: | pulsating variable star |
| magnitute at max. brightness | 4.62 | |
| magnitute amplitude | 0.02 | |
| photometric system | visual, photovisual or Johnson's V | |
| epoch for maximum light [JD] | 2441779.081 6. April 1973, 13:56:38 UT |
|
| period [d] | 0.3951 | |
| next maximum light [JD] | 2451809.4847 21. September 2000, 23:37:58 UT |
spectral information
| spectral class | B4Vne |
references
| to a study | Vol. I GCVS (see Kholopov et al. 1985-1988) |
| to a chart/photograph | no chart is avaible, but the star is contained in the 'Cape Photographic Durchmusterung' |
miscanellous
| ID in the GCVS catalogue | 30/9011 |
| constellation | Crux |
| notes on existence | The star is equivalent to '03090122mu 2'. |
| 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. |