| Identification Data |
| Common Name | Alnilam |
| Constellation | Orion |
| Star Name | 46eps Ori |
| Skymap Number | 5360046 |
| Henry Draper (HD) Number | 37128 |
| Harvard Revised (HR) Number | 1903 |
| SAO Number | 132346 |
| Durchmusterung (DM) Number | BD-01 969 |
Washington Double Stars (WDS) Number
| 05362-0112
|
| Positional Data |
| Position and Proper Motion (PPM) Number | 175945 |
| Right Ascension (RA) J2000 | 5h 36m 12.813s |
| Declination (Dec) J2000 | -1° 12' 6.911" |
| Position Uncertainty | 0.0080s |
| Proper Motion in RA (J2000)/cos(Dec) | +0.00010 |
| Proper Motion in Dec (J2000) | -0.001166 |
| Radial Velocity | +025.9km s-1 |
| Trigonometric Parallax | +0.00243s |
| Trigonometric Parallax Uncertainty | 0.00091s |
| GCI Unit Vector in X (J2000) | 0.103579 |
| GCI Unit Vector in Y (J2000) | 0.994400 |
| GCI Unit Vector in Z (J2000) | -0.020976 |
| Galactic Longitude | 205.22° |
Galactic Latitude
| -17.24°
|
| Observational Data |
| Observed Visual Magnitude (V) | 1.72 |
| Derived Visual Magnitude | |
| Derived Visual Magnitude or Observed Visual Magnitude Uncertainty | 0.005 |
| Observed B Magnitude | 1.60 |
| Observed B-V Colour | -0.123 |
| Observed B Magnitude or (B-V) Magnitude Uncertainty | 0.007 |
| Observed U Magnitude | |
| Observed U-B Colour | |
| Observed U Magnitude or (U-B) Magnitude Uncertainty | |
| Observed Photovisual Magnitude | 1.8 |
| Observed Photographic Magnitude | |
| Morgan Keenan (MK) Spectral Type | B0Ia |
| One-Dimensional Spectral Class | B0 |
| Position Angle | 57 |
| Year of Observation | 1907. AD |
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