| Identification Data |
| Common Name | |
| Constellation | Taurus |
| Star Name | 99 Tau |
| Skymap Number | 4570138 |
| Henry Draper (HD) Number | 31553 |
| Harvard Revised (HR) Number | 1586 |
| SAO Number | 76858 |
| Durchmusterung (DM) Number | BD+23 777 |
Washington Double Stars (WDS) Number
| 04578+2357
|
| Positional Data |
| Position and Proper Motion (PPM) Number | 93923 |
| Right Ascension (RA) J2000 | 4h 57m 48.647s |
| Declination (Dec) J2000 | +23° 56' 54.824" |
| Position Uncertainty | 0.0126s |
| Proper Motion in RA (J2000)/cos(Dec) | +0.00019 |
| Proper Motion in Dec (J2000) | -0.009466 |
| Radial Velocity | +003.9km s-1 |
| Trigonometric Parallax | +0.00692s |
| Trigonometric Parallax Uncertainty | 0.00103s |
| GCI Unit Vector in X (J2000) | 0.244959 |
| GCI Unit Vector in Y (J2000) | 0.880470 |
| GCI Unit Vector in Z (J2000) | 0.405916 |
| Galactic Longitude | 178.10° |
Galactic Latitude
| -11.65°
|
| Observational Data |
| Observed Visual Magnitude (V) | 5.81 |
| Derived Visual Magnitude | |
| Derived Visual Magnitude or Observed Visual Magnitude Uncertainty | 0.004 |
| Observed B Magnitude | 6.90 |
| Observed B-V Colour | +1.085 |
| Observed B Magnitude or (B-V) Magnitude Uncertainty | 0.009 |
| Observed U Magnitude | |
| Observed U-B Colour | |
| Observed U Magnitude or (U-B) Magnitude Uncertainty | |
| Observed Photovisual Magnitude | 6.0 |
| Observed Photographic Magnitude | 7.0 |
| Morgan Keenan (MK) Spectral Type | gG8 |
| One-Dimensional Spectral Class | K0 |
| Position Angle | 6 |
| Year of Observation | 1938. AD |
