The HAT-P-42 system contains 1 exoplanet. It is located 1321.71 light years away from the solar system.
| Mass | 1.18 solar masses |
| Radius | 1.53 solar radiae |
| Temperature | 5743 kelvin |
| Stellar Metallicity | 0.27 decimal exponent |
| Age | 5.2 billion years |
At more than 50 Earth masses, HAT-P-42 b is a gas giant, a planet whose mass is mostly made up of hydrogen and helium, like Jupiter and Saturn.
| Mass | 331.801 Earth masses |
| Density | 0.610 grams per cubic centimeter |
| Radius | 14.348 Earth radiae |
| Semi-major Axis | 0.0575 AU |
| Eccentricity | 0 |
| Orbital Period | 4.642 days |
| Discovery Method | Transit |
| Discovery Facility | HATNet |
| Discovery Telescope | Canon 200mm f/1.8L |
| Discovery Instrument | 2K CCD Sensor |
| Discovery Date | 2013-10 |
| Reference | Boisse et al. 2013 |