| Identification Data |
| Common Name | |
| Constellation | Libra |
| Star Name | 40tau Lib |
| Skymap Number | 15380091 |
| Henry Draper (HD) Number | 139365 |
| Harvard Revised (HR) Number | 5812 |
| SAO Number | 183649 |
| Durchmusterung (DM) Number | CD-2911837 |
Washington Double Stars (WDS) Number
|
|
| Positional Data |
| Position and Proper Motion (PPM) Number | 264487 |
| Right Ascension (RA) J2000 | 15h 38m 39.369s |
| Declination (Dec) J2000 | -29° 46' 39.914" |
| Position Uncertainty | 0.0105s |
| Proper Motion in RA (J2000)/cos(Dec) | -0.00170 |
| Proper Motion in Dec (J2000) | -0.026566 |
| Radial Velocity | +003.2km s-1 |
| Trigonometric Parallax | +0.00733s |
| Trigonometric Parallax Uncertainty | 0.00101s |
| GCI Unit Vector in X (J2000) | -0.502001 |
| GCI Unit Vector in Y (J2000) | -0.708059 |
| GCI Unit Vector in Z (J2000) | -0.496637 |
| Galactic Longitude | 341.07° |
Galactic Latitude
| 20.45°
|
| Observational Data |
| Observed Visual Magnitude (V) | 3.66 |
| Derived Visual Magnitude | |
| Derived Visual Magnitude or Observed Visual Magnitude Uncertainty | 0.003 |
| Observed B Magnitude | 3.50 |
| Observed B-V Colour | -0.159 |
| Observed B Magnitude or (B-V) Magnitude Uncertainty | 0.004 |
| Observed U Magnitude | |
| Observed U-B Colour | |
| Observed U Magnitude or (U-B) Magnitude Uncertainty | |
| Observed Photovisual Magnitude | 3.8 |
| Observed Photographic Magnitude | 3.6 |
| Morgan Keenan (MK) Spectral Type | B2.5V |
| One-Dimensional Spectral Class | B3 |
| Position Angle | |
| Year of Observation | AD |
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