Astronomy
Constellations - Taurus - 25eta Tau (Alcyone)

 
Identification Data
Common NameAlcyone
ConstellationTaurus
Star Name25eta Tau
Skymap Number3470072
Henry Draper (HD) Number23630
Harvard Revised (HR) Number1165
SAO Number76199
Durchmusterung (DM) NumberBD+23 541
Washington Double Stars (WDS) Number
03475+2406
Positional Data
Position and Proper Motion (PPM) Number92898
Right Ascension (RA) J20003h 47m 29.076s
Declination (Dec) J2000+24° 6' 18.494"
Position Uncertainty0.0089s
Proper Motion in RA (J2000)/cos(Dec)+0.00141
Proper Motion in Dec (J2000)-0.043166
Radial Velocity+009.5km s-1
Trigonometric Parallax+0.00887s
Trigonometric Parallax Uncertainty0.00099s
GCI Unit Vector in X (J2000)0.498865
GCI Unit Vector in Y (J2000)0.764417
GCI Unit Vector in Z (J2000)0.408412
Galactic Longitude166.67°
Galactic Latitude
-23.45°
Observational Data
Observed Visual Magnitude (V)2.87
Derived Visual Magnitude
Derived Visual Magnitude or Observed Visual Magnitude Uncertainty0.006
Observed B Magnitude2.78
Observed B-V Colour-0.09
Observed B Magnitude or (B-V) Magnitude Uncertainty0.006
Observed U Magnitude2.44
Observed U-B Colour-0.34
Observed U Magnitude or (U-B) Magnitude Uncertainty0.011
Observed Photovisual Magnitude3.0
Observed Photographic Magnitude
Morgan Keenan (MK) Spectral TypeB7IIIe
One-Dimensional Spectral ClassB5
Position Angle289
Year of Observation1920. AD

Data Source
SKY2000 - Master Star Catalog - Star Catalog Database, Version 2
    Sande C.B., Warren Jr. W.H., Tracewell D.A., Home A.T., Miller A.C.
    (Goddard Space Flight Center, Flight Dynamics Division (1998))

 
Page compiled: Sun Sep 02 13:15:50 GMT+01:00 2001