| Identification Data |
| Common Name | |
| Constellation | Taurus |
| Star Name | 81 Tau |
| Skymap Number | 4300119 |
| Henry Draper (HD) Number | 28546 |
| Harvard Revised (HR) Number | 1428 |
| SAO Number | 93978 |
| Durchmusterung (DM) Number | BD+15 639 |
Washington Double Stars (WDS) Number
| 04306+1542
|
| Positional Data |
| Position and Proper Motion (PPM) Number | 119971 |
| Right Ascension (RA) J2000 | 4h 30m 38.889s |
| Declination (Dec) J2000 | +15° 41' 30.765" |
| Position Uncertainty | 0.0120s |
| Proper Motion in RA (J2000)/cos(Dec) | +0.00721 |
| Proper Motion in Dec (J2000) | -0.024366 |
| Radial Velocity | +039.2km s-1 |
| Trigonometric Parallax | +0.02255s |
| Trigonometric Parallax Uncertainty | 0.00109s |
| GCI Unit Vector in X (J2000) | 0.365904 |
| GCI Unit Vector in Y (J2000) | 0.890485 |
| GCI Unit Vector in Z (J2000) | 0.270464 |
| Galactic Longitude | 180.82° |
Galactic Latitude
| -21.75°
|
| Observational Data |
| Observed Visual Magnitude (V) | 5.46 |
| Derived Visual Magnitude | |
| Derived Visual Magnitude or Observed Visual Magnitude Uncertainty | 0.004 |
| Observed B Magnitude | 5.73 |
| Observed B-V Colour | +0.267 |
| Observed B Magnitude or (B-V) Magnitude Uncertainty | 0.005 |
| Observed U Magnitude | |
| Observed U-B Colour | |
| Observed U Magnitude or (U-B) Magnitude Uncertainty | |
| Observed Photovisual Magnitude | 5.5 |
| Observed Photographic Magnitude | 5.8 |
| Morgan Keenan (MK) Spectral Type | A5m |
| One-Dimensional Spectral Class | A5 |
| Position Angle | 339 |
| Year of Observation | 1919. AD |
