The WASP-121 system contains 1 exoplanet. It is located 880.29 light years away from the solar system.
| Mass | 1.36 solar masses |
| Radius | 1.46 solar radiae |
| Temperature | 6776 kelvin |
| Stellar Metallicity | 0.13 decimal exponent |
| Age | 1.5 billion years |
At more than 50 Earth masses, WASP-121 b is a gas giant, a planet whose mass is mostly made up of hydrogen and helium, like Jupiter and Saturn.
| Mass | 367.727 Earth masses |
| Density | 0.266 grams per cubic centimeter |
| Radius | 19.649 Earth radiae |
| Semi-major Axis | 0.02596 AU |
| Eccentricity | 0 |
| Orbital Period | 1.275 days |
| Discovery Method | Transit |
| Discovery Facility | SuperWASP |
| Discovery Telescope | Canon 200mm f/1.8L |
| Discovery Instrument | e2v CCD Camera |
| Discovery Date | 2016-06 |
| Reference | Delrez et al. 2016 |