| Identification Data |
| Common Name | |
| Constellation | Ara |
| Star Name | alp Ara |
| Skymap Number | 17310163 |
| Henry Draper (HD) Number | 158427 |
| Harvard Revised (HR) Number | 6510 |
| SAO Number | 228069 |
| Durchmusterung (DM) Number | CD-4911511 |
Washington Double Stars (WDS) Number
| 17318-4953
|
| Positional Data |
| Position and Proper Motion (PPM) Number | 323069 |
| Right Ascension (RA) J2000 | 17h 31m 50.493s |
| Declination (Dec) J2000 | -49° 52' 34.121" |
| Position Uncertainty | 0.0087s |
| Proper Motion in RA (J2000)/cos(Dec) | -0.00324 |
| Proper Motion in Dec (J2000) | -0.067266 |
| Radial Velocity | +000.0km s-1 |
| Trigonometric Parallax | +0.01346s |
| Trigonometric Parallax Uncertainty | 0.00095s |
| GCI Unit Vector in X (J2000) | -0.078980 |
| GCI Unit Vector in Y (J2000) | -0.639584 |
| GCI Unit Vector in Z (J2000) | -0.764653 |
| Galactic Longitude | 340.76° |
Galactic Latitude
| -8.83°
|
| Observational Data |
| Observed Visual Magnitude (V) | 2.85 |
| Derived Visual Magnitude | |
| Derived Visual Magnitude or Observed Visual Magnitude Uncertainty | 0.003 |
| Observed B Magnitude | 2.74 |
| Observed B-V Colour | -0.113 |
| 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 | 3.0 |
| Observed Photographic Magnitude | 2.8 |
| Morgan Keenan (MK) Spectral Type | B2Vne |
| One-Dimensional Spectral Class | B3 |
| Position Angle | 173 |
| Year of Observation | 1913. AD |
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