K2-124 b: A Neptune-like Planet in a Distant System

K2-124 is a star located 458 light-years away. It has one known planet, K2-124 b, which was discovered in 2017 using the transit method, where a planet passes in front of its star from our viewpoint and causes a small dip in observed brightness. The host star has a mass of 0.43 solar masses, a radius of 0.41 solar radii, and a temperature of 3560 K. Its reported mass and radius estimates are smaller than the Sun's, and its reported temperature is cooler than the Sun's.

K2-124 b is classified as Neptune-like. It completes an orbit every 6.41 days and has a radius of 2.9 Earth radii, which is larger than Earth's. This size classification compares the planet's radius with Earth's, where a Neptune-like planet reaches up to 4 times Earth's radius; it does not indicate composition.