| Identification Data |
| Common Name | |
| Constellation | Hydrus |
| Star Name | tau1Hyi |
| Skymap Number | 1410052 |
| Henry Draper (HD) Number | 10859 |
| Harvard Revised (HR) Number | 516 |
| SAO Number | 255806 |
| Durchmusterung (DM) Number | CP-79 44 |
Washington Double Stars (WDS) Number
| 01414-7909
|
| Positional Data |
| Position and Proper Motion (PPM) Number | 367365 |
| Right Ascension (RA) J2000 | 1h 41m 21.470s |
| Declination (Dec) J2000 | -79° 8' 53.520" |
| Position Uncertainty | 0.0083s |
| Proper Motion in RA (J2000)/cos(Dec) | +0.02116 |
| Proper Motion in Dec (J2000) | +0.022167 |
| Radial Velocity | +002.km s-1 |
| Trigonometric Parallax | +0.00826s |
| Trigonometric Parallax Uncertainty | 0.00063s |
| GCI Unit Vector in X (J2000) | 0.170156 |
| GCI Unit Vector in Y (J2000) | 0.080576 |
| GCI Unit Vector in Z (J2000) | -0.982117 |
| Galactic Longitude | 299.99° |
Galactic Latitude
| -37.69°
|
| Observational Data |
| Observed Visual Magnitude (V) | 6.35 |
| Derived Visual Magnitude | |
| Derived Visual Magnitude or Observed Visual Magnitude Uncertainty | 0.004 |
| Observed B Magnitude | 7.29 |
| Observed B-V Colour | +0.944 |
| Observed B Magnitude or (B-V) Magnitude Uncertainty | 0.006 |
| Observed U Magnitude | |
| Observed U-B Colour | |
| Observed U Magnitude or (U-B) Magnitude Uncertainty | |
| Observed Photovisual Magnitude | 6.5 |
| Observed Photographic Magnitude | |
| Morgan Keenan (MK) Spectral Type | G6-8III |
| One-Dimensional Spectral Class | K0 |
| Position Angle | 349 |
| Year of Observation | 1918. AD |
