| Identification Data |
| Common Name | |
| Constellation | Orion |
| Star Name | 20tau Ori |
| Skymap Number | 5170104 |
| Henry Draper (HD) Number | 34503 |
| Harvard Revised (HR) Number | 1735 |
| SAO Number | 131952 |
| Durchmusterung (DM) Number | SD-07 1028 |
Washington Double Stars (WDS) Number
| 05176-0651
|
| Positional Data |
| Position and Proper Motion (PPM) Number | 187900 |
| Right Ascension (RA) J2000 | 5h 17m 36.389s |
| Declination (Dec) J2000 | -6° 50' 39.874" |
| Position Uncertainty | 0.0076s |
| Proper Motion in RA (J2000)/cos(Dec) | -0.00103 |
| Proper Motion in Dec (J2000) | -0.009666 |
| Radial Velocity | +020.1km s-1 |
| Trigonometric Parallax | +0.00588s |
| Trigonometric Parallax Uncertainty | 0.00077s |
| GCI Unit Vector in X (J2000) | 0.182613 |
| GCI Unit Vector in Y (J2000) | 0.975936 |
| GCI Unit Vector in Z (J2000) | -0.119174 |
| Galactic Longitude | 208.28° |
Galactic Latitude
| -23.96°
|
| Observational Data |
| Observed Visual Magnitude (V) | 3.60 |
| Derived Visual Magnitude | |
| Derived Visual Magnitude or Observed Visual Magnitude Uncertainty | 0.002 |
| Observed B Magnitude | 3.49 |
| Observed B-V Colour | -0.110 |
| 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 | 3.7 |
| Observed Photographic Magnitude | 3.6 |
| Morgan Keenan (MK) Spectral Type | B5III |
| One-Dimensional Spectral Class | B5 |
| Position Angle | 250 |
| Year of Observation | 1921. AD |
