The KELT-9 system contains 1 exoplanet. It is located 666.84 light years away from the solar system.
| Mass | 2.52 solar masses |
| Radius | 2.36 solar radiae |
| Temperature | 10170 kelvin |
| Stellar Metallicity | -0.03 decimal exponent |
| Age | 0.3 billion years |
At more than 50 Earth masses, KELT-9 b is a gas giant, a planet whose mass is mostly made up of hydrogen and helium, like Jupiter and Saturn.
| Mass | 915.350 Earth masses |
| Density | 0.530 grams per cubic centimeter |
| Radius | 21.196 Earth radiae |
| Semi-major Axis | 0.03462 AU |
| Eccentricity | 0 |
| Orbital Period | 1.481 days |
| Discovery Method | Transit |
| Discovery Facility | KELT-North |
| Discovery Telescope | Mamiya 645 80mm f/1.9 |
| Discovery Instrument | Apogee 4K CCD Sensor |
| Discovery Date | 2017-06 |
| Reference | Gaudi et al. 2017 |