Pleione
| catalogues and names | Pleione, BU Tau, 28 Tau, HR 1180, HD 23862, SAO 76229 |
| constellation | Taurus |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
| note (category: star names): | Pleione. |
position, motion, parallax:
| position (J2000) | RA: 3h 49min 11,2sec | DEC: +24° 8' 12'' |
| position (J1900) | RA: 3h 43min 14,1sec | DEC: +23° 49' 52'' |
| proper motion (J2000) | RA: 0,013 arcsec/a | DEC: -0,05 arcsec/a |
| radial velocity | 4 km/s note: spectroscopic binaries |
|
| rotational velocity | 329 km/s (uncertain) (variable) | |
| trigonometric parallax | -0,012 arcsec | |
magnitude
| visual magnitude | 5,09 (V on UBV Johnson system) |
spectral / color information
| spectral class | B8Vpe |
| B-V-magnitude | -0,08 |
| U-B-magnitude | -0,28 |
| R-I-magnitude | -0,07 |
| note (category: spectra): | Shell star. |
variability information
| variable star identification | BU Tau |
| note (category: variability): | Gamma Cas 4.77 - 5.50V. Var. may be clue to shell episodes. Shell ejection 1936 led to decrease in light 1937-1958. Variable hydrogen emission. Shell spectrum shows phase changes every 17 or 34 yrs. |
double/multiple star system information
| note (category: spectroscopic binaries): | Suspected long period. |
miscellaneous information
| note (category: group membership): | Pleiades cluster; Mel 22 #2181. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 3h 49min 11,181sec | DEC: +24° 8' 12,58'' | ±0,43 arcsec | source: 16 |
| proper motion (J2000) | RA: 0,0009 arcsec/a | DEC: -0,043 arcsec/a | source: 25 | |
| radial velocity | 4 km/s | source: 25 | ||
| galactic coord. (B1950) | longitude: 166,96° | latitude: -23,17° | ||
| GCI unit vector (J2000) | X: 0,493054 | Y: 0,767909 | Z: 0,408917 | |
magnitude:
| visual | 4,8 (observed) | source: 31 |
| photovisual | 5,2 | source: 2 |
| photographic | 5,1 | source: 16 |
spectral information:
| spectral class | B8 | source: 96 | |
| Morgan-Keenan | B8Vpe | source: 25 | |
| B-magnitude | 5,01 ±0,05 | B-V-magnitude | -0,08 |
| U-magnitude | 4,73 ±0,05 | U-B-magnitude | -0,28 |
variability information:
| variability type | 264 |
| var. amplitude | 0,73 |
double/multiple star system information:
| separation between brightest and second brightest component | 0,2 arcsec |
| position angle | 37 ° |
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 | |
| 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 | |
| 31 | CRM' (non-GCVS variable data) |
| Warren, W.H. Jr., Northern Hemisphere Catalog of Red Magnitudes, 1994 | |
| 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: 3h 46min 12,391sec | DEC: +23° 59' 7,56'' | ±0,016 arcsec |
| position (J2000) | RA: 3h 49min 11,18sec | DEC: +24° 8' 11,96'' | |
| proper motion J1950 (FK4) | RA: 0,001 arcsec/a | DEC: -0,047 arcsec/a | ±0,003 arcsec/a in RA ±0,002 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0,0009 arcsec/a | DEC: -0,05 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 5,2 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | B8p |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | GC, catalogue number: 4587 |
| Durchmusterung | BD+23 558 |
| Boss General Catalogue | 4587 |
| Henry Draper Catalogue | 23862 |
data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)
position:
| position (J1950) | RA: 3h 46min 12,4sec | DEC: +23° 59' 8'' |
variability informations:
| variability type | GCAS | eruptive variable star |
| magnitute at max. brightness | 4,77 | |
| magnitute at min. brightness | 5,5 | |
| photometric system | visual, photovisual or Johnson's V |
spectral information
| spectral class | B8Vne |
references
| to a study | Vol. III GCVS |
| to a chart/photograph | Vol. I GCVS (see Kholopov et al. 1985-1988) |
miscanellous
| ID in the GCVS catalogue | 78/98 |
| constellation | Taurus |
| notes on existence | The star is equivalent to '0780099 BV'. |
| There are notes in published catalog. | |
variability type description
| variability type | description |
| GCAS | Eruptive irregular variables of the Gamma Cas type. These are rapidly rotating B III-IVe stars with mass outflow from their equatorial zones. The formation of equatorial rings or disks is often accompanied by temporary fading. Light amplitudes may reach 1.5 mag in V. |