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. The Washington Visual Double Star Catalog, 1996.0

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

catalogues and names Aldebaran, a Tau, alf Tau, 87 Tau, HR 1457, HD 29139, SAO 94027, FK5: 168, WDS 04359+1631A
other names Cor Tauri, Parilicium
constellation Taurus

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

note (category: star names): ALDEBARAN; Cor Tauri; Parilicium.

object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978)

position, motion, parallax:

position (J2000) RA: 4h 35min 55,2sec DEC: +16 30' 33''
position (J1900) RA: 4h 30min 10,9sec DEC: +16 18' 30''
proper motion (J2000) RA: 0,063 arcsec/a DEC: -0,19 arcsec/a
radial velocity 54 km/s
note: spectroscopic binaries
rotational velocity <17 km/s (uncertain) (variable)
trigonometric parallax 0,048 arcsec
note (category: dynamical parallaxes): 0.048".


visual magnitude 0,85
(V on UBV Johnson system)

spectral / color information

spectral class K5+III
B-V-magnitude 1,54
U-B-magnitude 1,9
R-I-magnitude 0,94
note (category: spectra): IR emission envelope diam. 10". MgII emissions indicate a cooler shell surrounding the supergiant.

variability information

variable star identification Alp Tau
note (category: variability): Lb 0.75 - 0.95V. Var. H and K emission.

double/multiple star system information

number of components of multiple star system 6
separation 121,7 arcsec
mag difference (of double or brightest multiple) 9,8
component ID AC
note (category: double and multiple data): AB binary. B is 13.5v, dM2 at 31". CD, 122" from A is 11.2, 13.6v sep. 2" also binary but independent of AB.

miscellaneous information

note (category: group membership): Hyades group.
note (category: stellar radii or diameters): Diam. Two determinations, 0.022" and 0.0237".

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

position, motion, parallax:

position (J2000) RA: 4h 35min 55,237sec DEC: +16 30' 33,39'' 0,06 arcsec source: 15
proper motion (J2000) RA: 0,0044 arcsec/a DEC: -0,19 arcsec/a source: 25
radial velocity 54 km/s source: 25
trigonometric parallax 0,048 0,005 arcsec source: 25
galactic coord. (B1950) longitude: 180,97 latitude: -20,25
GCI unit vector (J2000) X: 0,343904 Y: 0,894973 Z: 0,284171


visual 0,8 (observed) source: 31
photovisual 1,1 source: 2

spectral information:

spectral class K5 source: 96
Morgan-Keenan K5+III source: 25
B-magnitude 2,39 0,05 B-V-magnitude 1,54
U-magnitude 4,29 0,05 U-B-magnitude 1,9

variability information:

source of data: 30
variability type 171
var. amplitude 0,2

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 30,8 arcsec
magnitude difference between brightest and second brightest component 12,8
position angle 110


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
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: 4h 33min 2,896sec DEC: +16 24' 37,51'' 0,003 arcsec
position (J2000) RA: 4h 35min 55,243sec DEC: +16 30' 33,36''
proper motion J1950 (FK4) RA: 0,0045 arcsec/a DEC: -0,189 arcsec/a 0,001 arcsec/a in RA
0,001 arcsec/a in DEC
proper motion J2000 (FK5) RA: 0,0045 arcsec/a DEC: -0,19 arcsec/a
source of proper motion data Determined by source catalog


visual 1,1 (accuracy: 2 decimals)
source of visual magnitude data Taken from the "Henry Draper Catalogue".

spectral information:

spectral class K5
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.


source catalogue FK4, catalogue number: 168
Durchmusterung BD+16 629
Boss General Catalogue 5605
Henry Draper Catalogue 29139

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

position and proper motion:

position (J2000) RA: 4h 35,9min DEC: +16 31'
proper motion (J2000) RA: 0,063 arcsec/a DEC: -0,19 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 1877 17 110 30,8'' 0,85 13,6 K5III BU 550
AC 1832 17 36 109'' 0,85 11,3 - STF 2
1923 34 121,7''
AE 1899 1 331 31'' 0,85 - - BU 1031
AF 1908 1 124 271,4'' 0,85 13,6 - BU 1031
CD 1888 17 281 2,3'' 11,3 13,7 - BU 1031
1962 271 1,2''

discoverer information:

discoverer code discoverer reference
BU 550 Burnham, S.W. -
STF 2 Struve, F.G.W. -
BU 1031 Burnham, S.W. -


note Alpha Tauri. A is an unclassified variable.

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


position (J1950) RA: 4h 33min 2,9sec DEC: +16 24' 38''

variability informations:

variability type LB: pulsating variable star
magnitute at max. brightness 0,75
magnitute at min. brightness 0,95
photometric system visual, photovisual or Johnson's V

spectral information

spectral class K5III


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 'Bonner Durchmusterung'


ID in the GCVS catalogue 78/9001
constellation Taurus
notes on existence The star is equivalent to '0789006 zet'.
There are notes in published catalog.

variability type description

variability type description
LB Slow irregular variables. The light variations of these stars show no evidence of periodicity, or any periodicity present is very poorly defined and appears only occasionally. Like for the type I, stars are often attributed to this type because of being insufficiently studied.
Many type L variables are really semiregulars or belong to other types.

Slow irregular variables of late spectral types (K, M, C, S); as a rule, they are giants (CO Cyg). This type is also ascribed, in the GCVS, to slow red irregular variables in the case of unknown spectral types and luminosities.

Irregular variable supergiants of late spectral types having amplitudes of about 1 mag in V (TZ Cas).