The tau Boo system contains 1 exoplanet. It is located 51.05 light years away from the solar system.
| Mass | 1.32 solar masses |
| Radius | 1.43 solar radiae |
| Temperature | 6466.27 kelvin |
| Stellar Metallicity | 0.264 decimal exponent |
| Age | 2 billion years |
At more than 50 Earth masses, tau Boo b is a gas giant, a planet whose mass is mostly made up of hydrogen and helium, like Jupiter and Saturn.
| Mass | 1891.000 Earth masses |
| Density | 4.950 grams per cubic centimeter |
| Radius | 12.800 Earth radiae |
| Semi-major Axis | 0.049 AU |
| Eccentricity | 0.011 |
| Orbital Period | 3.312 days |
| Discovery Method | Radial Velocity |
| Discovery Facility | Lick Observatory |
| Discovery Telescope | 3.0 m C. Donald Shane Telescope |
| Discovery Instrument | Hamilton Echelle Spectrograph |
| Discovery Date | 1997-01 |
| Reference | Butler et al. 1997 |