Alcyone

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

catalogues and names Alcyone, h Tau, NSV 15775, 25 Tau, HR 1165, HD 23630, SAO 76199, FK5: 139, WDS 03475+2406A
constellation Taurus

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

note (category: star names): ALCYONE. The brightest of the Pleiades.

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

position, motion, parallax:

position (J2000) RA: 3h 47min 29,1sec DEC: +24° 6' 18''
position (J1900) RA: 3h 41min 32,3sec DEC: +23° 47' 46''
proper motion (J2000) RA: 0,019 arcsec/a DEC: -0,046 arcsec/a
radial velocity 10 km/s
note: suspected variable radial velocity
rotational velocity 215 km/s (uncertain) (variable)
trigonometric parallax 0,008 arcsec
note (category: radial and/or rotational velocities): Rotationally unstable Be shell star.

magnitude

visual magnitude 2,87
(V on UBV Johnson system)

spectral / color information

spectral class B7IIIe
B-V-magnitude -0,09
U-B-magnitude -0,34
R-I-magnitude -0,04
note (category: colors): Color excess E(B-V) = +0.03.

double/multiple star system information

number of components of multiple star system 5
separation 0 arcsec
mag difference (of double or brightest multiple) 1,6
component ID O
note Worley (1978) update of the IDS
note (category: double and multiple data): Component A is occultation double, sep. 0.031". B, C, D, 8.1 A0V, 8.1 Am(A5/F0/F2) and 8.7v F2V at 117" to 190". Possibly second occultation companion at 0.001", unresolved by speckle interferometry. vsini of B 155k/s. Numerous photometric determinations yield 6.3 for B component. The HD gives 8.1 for 23629 and the IDS indicates 8.1. Burnham, Double Stars, gave 7.0 vis.

miscellaneous information

note (category: group membership): Pleiades cluster; Mel 22 #1432; in reflection nebula; Pleiades nebula; member assoc. Tau R1 at 110 pc.
note (category: stellar radii or diameters): Angular diameter = 0.0016".

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

position, motion, parallax:

position (J2000) RA: 3h 47min 29,073sec DEC: +24° 6' 18,38'' ±0,06 arcsec source: 15
proper motion (J2000) RA: 0,0014 arcsec/a DEC: -0,046 arcsec/a source: 25
radial velocity 10 km/s source: 25
trigonometric parallax 0,008 ±0,001 arcsec source: 25
galactic coord. (B1950) longitude: 166,67° latitude: -23,45°
GCI unit vector (J2000) X: 0,498866 Y: 0,764417 Z: 0,408412

magnitude:

visual 2,87 (observed) source: 25
photovisual 3 source: 2

spectral information:

spectral class B5 source: 96
Morgan-Keenan B7IIIe source: 25
B-magnitude 2,78 ±0,05 B-V-magnitude -0,09
U-magnitude 2,44 ±0,05 U-B-magnitude -0,34

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 117,2 arcsec
magnitude difference between brightest and second brightest component 3,42
position angle 289 °

component magnitude spectral class catalogue(s)/name(s)
A 2,87 B5 Alcyone, h Tauri, 25 Tau, HR 1165, HD 23630, SAO 76199
B 6,29 A0
C 8,287 A0

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
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 44min 30,424sec DEC: +23° 57' 7,57'' ±0,004 arcsec
position (J2000) RA: 3h 47min 29,074sec DEC: +24° 6' 18,33''
proper motion J1950 (FK4) RA: 0,0014 arcsec/a DEC: -0,044 arcsec/a ±0,001 arcsec/a in RA
±0,001 arcsec/a in DEC
proper motion J2000 (FK5) RA: 0,0013 arcsec/a DEC: -0,047 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

visual 3 (accuracy: 2 decimals)
source of visual magnitude data Taken from the "Henry Draper Catalogue".

spectral information:

spectral class B5p
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue FK4, catalogue number: 139
Durchmusterung BD+23 541
Boss General Catalogue 4541
Henry Draper Catalogue 23630

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

position and proper motion:

position (J2000) RA: 3h 47,5min DEC: +24° 6'
proper motion (J2000) RA: 0,019 arcsec/a DEC: -0,046 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 1836 10 289° 117,2'' 2,87 6,29 B7IIIe STF 8
AC 1868 3 312° 180,8'' 2,87 8,27 - STF 8
AD 1868 3 295° 190,5'' 2,87 8,7 - STF 8
BC 1824 2 344° 85,8'' 6,29 8,27 A4V STF 8
BD 1824 3 304° 74,7'' 6,29 8,72 - STF 8
1889 - 75,5''
CD 1856 2 224° '' 8,27 8,72 A7V STF 8
1888 - 53,8''

discoverer information:

discoverer code discoverer reference
STF 8 Struve, F.G.W. -

notes:

note Eta Tau. A is an occultation and spectroscopic binary. B, at 03 47.4 +24 07, is an occultation binary. C is V647 Tau.