| Identification Data |
| Common Name | Alnitak |
| Constellation | Orion |
| Star Name | 50zet Ori |
| Skymap Number | 5400159 |
| Henry Draper (HD) Number | 37742 |
| Harvard Revised (HR) Number | 1948 |
| SAO Number | 132444 |
| Durchmusterung (DM) Number | SD-02 1338 |
Washington Double Stars (WDS) Number
| 05407-0157
|
| Positional Data |
| Position and Proper Motion (PPM) Number | 400076 |
| Right Ascension (RA) J2000 | 5h 40m 45.527s |
| Declination (Dec) J2000 | -1° 56' 33.260" |
| Position Uncertainty | 0.0074s |
| Proper Motion in RA (J2000)/cos(Dec) | +0.00027 |
| Proper Motion in Dec (J2000) | +0.002567 |
| Radial Velocity | +018.6km s-1 |
| Trigonometric Parallax | +0.00399s |
| Trigonometric Parallax Uncertainty | 0.00079s |
| GCI Unit Vector in X (J2000) | 0.083809 |
| GCI Unit Vector in Y (J2000) | 0.995905 |
| GCI Unit Vector in Z (J2000) | -0.033898 |
| Galactic Longitude | 206.46° |
Galactic Latitude
| -16.59°
|
| Observational Data |
| Observed Visual Magnitude (V) | 1.74 |
| Derived Visual Magnitude | |
| Derived Visual Magnitude or Observed Visual Magnitude Uncertainty | 0.001 |
| Observed B Magnitude | |
| Observed B-V Colour | -0.199 |
| Observed B Magnitude or (B-V) Magnitude Uncertainty | 0.022 |
| Observed U Magnitude | |
| Observed U-B Colour | |
| Observed U Magnitude or (U-B) Magnitude Uncertainty | |
| Observed Photovisual Magnitude | 2.1 |
| Observed Photographic Magnitude | 1.8 |
| Morgan Keenan (MK) Spectral Type | O9.7Ib |
| One-Dimensional Spectral Class | B0 |
| Position Angle | 166 |
| Year of Observation | 1990. AD |
