The XO-3 system contains 1 exoplanet. It is located 694.89 light years away from the solar system.
| Mass | 0.58 solar masses |
| Radius | 1.54 solar radiae |
| Temperature | 6429 kelvin |
| Stellar Metallicity | -0.18 decimal exponent |
| Age | 2.82 billion years |
At more than 50 Earth masses, XO-3 b is a gas giant, a planet whose mass is mostly made up of hydrogen and helium, like Jupiter and Saturn.
| Mass | 2316.981 Earth masses |
| Density | 8.090 grams per cubic centimeter |
| Radius | 15.805 Earth radiae |
| Semi-major Axis | 0.0476 AU |
| Eccentricity | 0.29 |
| Orbital Period | 3.192 days |
| Discovery Method | Transit |
| Discovery Facility | XO |
| Discovery Telescope | Canon 200mm f/1.8L |
| Discovery Instrument | Apogee CCD Array |
| Discovery Date | 2008-04 |
| Reference | Johns-Krull et al. 2008 |