| Identification Data |
| Common Name | Alnair |
| Constellation | Grus |
| Star Name | alp Gru |
| Skymap Number | 22080038 |
| Henry Draper (HD) Number | 209952 |
| Harvard Revised (HR) Number | 8425 |
| SAO Number | 230992 |
| Durchmusterung (DM) Number | CD-4714063 |
Washington Double Stars (WDS) Number
| 22082-4658
|
| Positional Data |
| Position and Proper Motion (PPM) Number | 327928 |
| Right Ascension (RA) J2000 | 22h 8m 13.985s |
| Declination (Dec) J2000 | -46° 57' 39.512" |
| Position Uncertainty | 0.0059s |
| Proper Motion in RA (J2000)/cos(Dec) | +0.01246 |
| Proper Motion in Dec (J2000) | -0.147966 |
| Radial Velocity | +010.9km s-1 |
| Trigonometric Parallax | +0.03216s |
| Trigonometric Parallax Uncertainty | 0.00082s |
| GCI Unit Vector in X (J2000) | 0.602934 |
| GCI Unit Vector in Y (J2000) | -0.319800 |
| GCI Unit Vector in Z (J2000) | -0.730889 |
| Galactic Longitude | 350.01° |
Galactic Latitude
| -52.47°
|
| Observational Data |
| Observed Visual Magnitude (V) | 1.77 |
| Derived Visual Magnitude | |
| Derived Visual Magnitude or Observed Visual Magnitude Uncertainty | 0.004 |
| Observed B Magnitude | 1.70 |
| Observed B-V Colour | -0.073 |
| Observed B Magnitude or (B-V) Magnitude Uncertainty | 0.005 |
| Observed U Magnitude | |
| Observed U-B Colour | |
| Observed U Magnitude or (U-B) Magnitude Uncertainty | |
| Observed Photovisual Magnitude | 2.2 |
| Observed Photographic Magnitude | 2.0 |
| Morgan Keenan (MK) Spectral Type | B7IV |
| One-Dimensional Spectral Class | B5 |
| Position Angle | 149 |
| Year of Observation | 1947. AD |
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