K2-80: A Distant Star With Three Known Worlds

K2-80 is a star located 655 light-years from Earth. It has three known planets, all discovered by the transit method, in which a planet passes in front of its star from our viewpoint and causes a small dip in observed brightness. The star's mass is 0.913 solar masses and its radius is 0.841 solar radii, both smaller than the Sun's corresponding values. Its temperature is 5380 K, cooler than the Sun's.

K2-80 c is an Earth-like world with a radius of 1.47 Earth radii, larger than Earth's radius. It completes one orbit in 5.61 days, the shortest period among the listed planets. K2-80 b is a Super-Earth with a radius of 2.01 Earth radii, also larger than Earth's, and an orbital period of 19.1 days, the second-shortest among the listed planets. K2-80 d is a Neptune-like planet with a radius of 2.55 Earth radii, larger than Earth's and the largest among the listed planets. Its orbital period is 28.9 days, the longest among the listed planets. K2-80 d was discovered in 2018, while K2-80 b and K2-80 c were both discovered in 2016.