| Identification Data |
| Common Name | |
| Constellation | Centaurus |
| Star Name | tau Cen |
| Skymap Number | 12370083 |
| Henry Draper (HD) Number | 109787 |
| Harvard Revised (HR) Number | 4802 |
| SAO Number | 223560 |
| Durchmusterung (DM) Number | CD-47 7745 |
Washington Double Stars (WDS) Number
|
|
| Positional Data |
| Position and Proper Motion (PPM) Number | 317627 |
| Right Ascension (RA) J2000 | 12h 37m 42.163s |
| Declination (Dec) J2000 | -48° 32' 28.694" |
| Position Uncertainty | 0.0059s |
| Proper Motion in RA (J2000)/cos(Dec) | -0.01879 |
| Proper Motion in Dec (J2000) | -0.006566 |
| Radial Velocity | +005.0km s-1 |
| Trigonometric Parallax | +0.02477s |
| Trigonometric Parallax Uncertainty | 0.00069s |
| GCI Unit Vector in X (J2000) | -0.653141 |
| GCI Unit Vector in Y (J2000) | -0.108428 |
| GCI Unit Vector in Z (J2000) | -0.749433 |
| Galactic Longitude | 300.60° |
Galactic Latitude
| 14.27°
|
| Observational Data |
| Observed Visual Magnitude (V) | 3.85 |
| Derived Visual Magnitude | |
| Derived Visual Magnitude or Observed Visual Magnitude Uncertainty | 0.002 |
| Observed B Magnitude | 3.90 |
| Observed B-V Colour | +0.054 |
| Observed B Magnitude or (B-V) Magnitude Uncertainty | 0.002 |
| Observed U Magnitude | |
| Observed U-B Colour | |
| Observed U Magnitude or (U-B) Magnitude Uncertainty | |
| Observed Photovisual Magnitude | 4.0 |
| Observed Photographic Magnitude | 4.1 |
| Morgan Keenan (MK) Spectral Type | A2V |
| One-Dimensional Spectral Class | A2 |
| Position Angle | |
| Year of Observation | AD |
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