Two Super-Earths Around HIP 113103

HIP 113103 is a star 151 light-years away, with two planets orbiting it. The star is 0.47 billion years old and has a mass of 0.761 solar masses, a radius of 0.742 solar radii, and a temperature of 4930 K. Its mass, radius, and temperature are all smaller or cooler than the Sun's.

Both planets were discovered in 2023 by the transit method, in which a planet passing in front of its star causes a small dip in observed brightness; repeated dips help establish orbital periods. HIP 113103 b is a Super-Earth with an orbital period of 7.61 days and a radius of 1.83 Earth radii, larger than Earth's. HIP 113103 c, also a Super-Earth, has an orbital period of 14.2 days and a radius of 2.4 Earth radii, also larger than Earth's. Super-Earths reach up to 2.5 times Earth's radius.

Among the listed planets, HIP 113103 b has the shortest year and the smallest radius by reported estimates, while HIP 113103 c has the longest year and the largest radius.