A Young Sun-Like Star and Its Two Transiting Planets

TIC 434398831 is a G4 V star located 708 light-years away. This G-type dwarf is very young, with an age of 0.061 billion years. The star has a mass of 0.992 solar masses, a radius of 0.909 solar radii, and a temperature of 5640 K. Its reported radius estimate is smaller than the Sun's, and its reported temperature is cooler than the Sun's. Two planets are known to orbit this host.

TIC 434398831 b is a Neptune-like planet discovered by transit in 2025. It has an orbital period of 3.69 days and a radius of 3.51 Earth radii. TIC 434398831 c is a Jupiter-like planet, also discovered by transit in 2025. It has an orbital period of 6.21 days and a radius of 5.63 Earth radii. Among the listed planets, TIC 434398831 b has the shortest year and the smallest radius by reported estimates, while TIC 434398831 c has the longest year and the largest radius. Both planets' reported radius estimates are larger than Earth's.