| Identification Data |
| Common Name | Aludra |
| Constellation | Canis Major |
| Star Name | 31eta CMa |
| Skymap Number | 7240025 |
| Henry Draper (HD) Number | 58350 |
| Harvard Revised (HR) Number | 2827 |
| SAO Number | 173651 |
| Durchmusterung (DM) Number | CD-29 4328 |
Washington Double Stars (WDS) Number
| 07241-2918
|
| Positional Data |
| Position and Proper Motion (PPM) Number | 252311 |
| Right Ascension (RA) J2000 | 7h 24m 5.702s |
| Declination (Dec) J2000 | -29° 18' 11.173" |
| Position Uncertainty | 0.0065s |
| Proper Motion in RA (J2000)/cos(Dec) | -0.00029 |
| Proper Motion in Dec (J2000) | +0.006766 |
| Radial Velocity | +041.1km s-1 |
| Trigonometric Parallax | +0.00102s |
| Trigonometric Parallax Uncertainty | 0.00057s |
| GCI Unit Vector in X (J2000) | -0.312850 |
| GCI Unit Vector in Y (J2000) | 0.813992 |
| GCI Unit Vector in Z (J2000) | -0.489430 |
| Galactic Longitude | 242.62° |
Galactic Latitude
| -6.49°
|
| Observational Data |
| Observed Visual Magnitude (V) | 2.46 |
| Derived Visual Magnitude | |
| Derived Visual Magnitude or Observed Visual Magnitude Uncertainty | 0.003 |
| Observed B Magnitude | 2.41 |
| Observed B-V Colour | -0.048 |
| 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 | 2.4 |
| Observed Photographic Magnitude | 2.3 |
| Morgan Keenan (MK) Spectral Type | B5Ia |
| One-Dimensional Spectral Class | B5 |
| Position Angle | 285 |
| Year of Observation | 1909. AD |
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