Kepler-529: A Distant Star With Three Known Worlds

Kepler-529 is a star located 2610 light-years from Earth, and it is known to host three planets. The star is estimated to be 3.98 billion years old, with a mass of 1.07 solar masses, a radius of 1.14 solar radii, and a temperature of 6090 K. Its mass estimate is larger than the Sun's, its radius estimate is also larger than the Sun's, and its reported temperature is hotter than the Sun's.

All three planets were detected 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. Kepler-529 b and Kepler-529 c were both discovered in 2016, while Kepler-529 d was discovered in 2021. Kepler-529 b and Kepler-529 c are Super-Earths, a size class that reaches 2.5 times Earth's radius. Kepler-529 b has an orbital period of 1.98 days and a radius of 1.86 Earth radii, while Kepler-529 c has an orbital period of 12.8 days and a radius of 2 Earth radii. Both have radius estimates larger than Earth's.

Kepler-529 d is a Neptune-like planet, a size class that reaches 4 times Earth's radius. It has an orbital period of 35.9 days and a radius of 2.8 Earth radii, which is larger than Earth's. Among the listed planets, Kepler-529 b has the shortest year by reported estimates, while Kepler-529 d has the longest. Kepler-529 b also has the smallest radius among the listed planets, and Kepler-529 d has the largest. Kepler-529 c has the second-shortest year and the second-smallest radius among the three.