| Identification Data |
| Common Name | Alphard |
| Constellation | Hydra |
| Star Name | 30alp Hya |
| Skymap Number | 9270098 |
| Henry Draper (HD) Number | 81797 |
| Harvard Revised (HR) Number | 3748 |
| SAO Number | 136871 |
| Durchmusterung (DM) Number | SD-08 2680 |
Washington Double Stars (WDS) Number
| 09276-0840
|
| Positional Data |
| Position and Proper Motion (PPM) Number | 192393 |
| Right Ascension (RA) J2000 | 9h 27m 35.243s |
| Declination (Dec) J2000 | -8° 39' 30.969" |
| Position Uncertainty | 0.0096s |
| Proper Motion in RA (J2000)/cos(Dec) | -0.00098 |
| Proper Motion in Dec (J2000) | +0.033366 |
| Radial Velocity | -004.4km s-1 |
| Trigonometric Parallax | +0.01840s |
| Trigonometric Parallax Uncertainty | 0.00078s |
| GCI Unit Vector in X (J2000) | -0.777933 |
| GCI Unit Vector in Y (J2000) | 0.610046 |
| GCI Unit Vector in Z (J2000) | -0.150547 |
| Galactic Longitude | 241.50° |
Galactic Latitude
| 29.05°
|
| Observational Data |
| Observed Visual Magnitude (V) | 1.99 |
| Derived Visual Magnitude | |
| Derived Visual Magnitude or Observed Visual Magnitude Uncertainty | 0.004 |
| Observed B Magnitude | 3.44 |
| Observed B-V Colour | +1.453 |
| 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 | 2.2 |
| Observed Photographic Magnitude | 3.2 |
| Morgan Keenan (MK) Spectral Type | K3II-III |
| One-Dimensional Spectral Class | K2 |
| Position Angle | 153 |
| Year of Observation | 1899. AD |
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