| Identification Data |
| Common Name | Rukbat |
| Constellation | Saggitarius |
| Star Name | alp Sgr |
| Skymap Number | 19230189 |
| Henry Draper (HD) Number | 181869 |
| Harvard Revised (HR) Number | 7348 |
| SAO Number | 229659 |
| Durchmusterung (DM) Number | CD-4013245 |
Washington Double Stars (WDS) Number
|
|
| Positional Data |
| Position and Proper Motion (PPM) Number | 325060 |
| Right Ascension (RA) J2000 | 19h 23m 53.176s |
| Declination (Dec) J2000 | -40° 36' 57.384" |
| Position Uncertainty | 0.0135s |
| Proper Motion in RA (J2000)/cos(Dec) | +0.00287 |
| Proper Motion in Dec (J2000) | -0.120866 |
| Radial Velocity | -000.7km s-1 |
| Trigonometric Parallax | +0.01920s |
| Trigonometric Parallax Uncertainty | 0.00099s |
| GCI Unit Vector in X (J2000) | 0.271682 |
| GCI Unit Vector in Y (J2000) | -0.708807 |
| GCI Unit Vector in Z (J2000) | -0.650985 |
| Galactic Longitude | 357.72° |
Galactic Latitude
| -23.09°
|
| Observational Data |
| Observed Visual Magnitude (V) | 3.96 |
| Derived Visual Magnitude | |
| Derived Visual Magnitude or Observed Visual Magnitude Uncertainty | 0.003 |
| Observed B Magnitude | 3.87 |
| Observed B-V Colour | -0.087 |
| 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 | 4.1 |
| Observed Photographic Magnitude | 4.1 |
| Morgan Keenan (MK) Spectral Type | B8V |
| One-Dimensional Spectral Class | B8 |
| Position Angle | |
| Year of Observation | AD |
