| Identification Data |
| Common Name | Alcyone |
| Constellation | Taurus |
| Star Name | 25eta Tau |
| Skymap Number | 3470072 |
| Henry Draper (HD) Number | 23630 |
| Harvard Revised (HR) Number | 1165 |
| SAO Number | 76199 |
| Durchmusterung (DM) Number | BD+23 541 |
Washington Double Stars (WDS) Number
| 03475+2406
|
| Positional Data |
| Position and Proper Motion (PPM) Number | 92898 |
| Right Ascension (RA) J2000 | 3h 47m 29.076s |
| Declination (Dec) J2000 | +24° 6' 18.494" |
| Position Uncertainty | 0.0089s |
| 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 Uncertainty | 0.00099s |
| 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 Longitude | 166.67° |
Galactic Latitude
| -23.45°
|
| Observational Data |
| Observed Visual Magnitude (V) | 2.87 |
| Derived Visual Magnitude | |
| Derived Visual Magnitude or Observed Visual Magnitude Uncertainty | 0.006 |
| Observed B Magnitude | 2.78 |
| Observed B-V Colour | -0.09 |
| Observed B Magnitude or (B-V) Magnitude Uncertainty | 0.006 |
| Observed U Magnitude | 2.44 |
| Observed U-B Colour | -0.34 |
| Observed U Magnitude or (U-B) Magnitude Uncertainty | 0.011 |
| Observed Photovisual Magnitude | 3.0 |
| Observed Photographic Magnitude | |
| Morgan Keenan (MK) Spectral Type | B7IIIe |
| One-Dimensional Spectral Class | B5 |
| Position Angle | 289 |
| Year of Observation | 1920. AD |
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