| Identification Data |
| Common Name | Head of Hydrus |
| Constellation | Hydrus |
| Star Name | alp Hyi |
| Skymap Number | 1580123 |
| Henry Draper (HD) Number | 12311 |
| Harvard Revised (HR) Number | 591 |
| SAO Number | 248474 |
| Durchmusterung (DM) Number | CP-62 162 |
Washington Double Stars (WDS) Number
|
|
| Positional Data |
| Position and Proper Motion (PPM) Number | 352685 |
| Right Ascension (RA) J2000 | 1h 58m 46.193s |
| Declination (Dec) J2000 | -61° 34' 11.493" |
| Position Uncertainty | 0.0064s |
| Proper Motion in RA (J2000)/cos(Dec) | +0.03676 |
| Proper Motion in Dec (J2000) | +0.026966 |
| Radial Velocity | +007.0km s-1 |
| Trigonometric Parallax | +0.04574s |
| Trigonometric Parallax Uncertainty | 0.00055s |
| GCI Unit Vector in X (J2000) | 0.413575 |
| GCI Unit Vector in Y (J2000) | 0.235827 |
| GCI Unit Vector in Z (J2000) | -0.879398 |
| Galactic Longitude | 289.45° |
Galactic Latitude
| -53.76°
|
| Observational Data |
| Observed Visual Magnitude (V) | 2.86 |
| Derived Visual Magnitude | |
| Derived Visual Magnitude or Observed Visual Magnitude Uncertainty | 0.002 |
| Observed B Magnitude | 3.17 |
| Observed B-V Colour | +0.308 |
| Observed B Magnitude or (B-V) Magnitude Uncertainty | 0.003 |
| Observed U Magnitude | |
| Observed U-B Colour | |
| Observed U Magnitude or (U-B) Magnitude Uncertainty | |
| Observed Photovisual Magnitude | 3.0 |
| Observed Photographic Magnitude | 3.3 |
| Morgan Keenan (MK) Spectral Type | F0III-IVn |
| One-Dimensional Spectral Class | F0 |
| Position Angle | |
| Year of Observation | AD |
