The object was found in the following catalogues:
  1. The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version)

  2. SKY2000 - Master Star Catalog

  3. Smithsonian Astrophysical Observatory Star Catalog

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

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


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


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:

source of data: 30
variability type 264
var. amplitude 0,73

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 0,2 arcsec
position angle 37


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


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.


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 (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


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


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.