HD 147873 and Its Two Known Planets

HD 147873 is a G1 V star located 356 light-years away, and it is known to host two planets. The star is a main-sequence dwarf classified as Sun-like, with an age of 4 billion years, a mass of 1.38 solar masses, a radius of 2.29 solar radii, and a temperature of 5970 K. Its reported mass and radius estimates are both larger than the Sun's, and its reported temperature is hotter than the Sun's.

Both known planets were discovered in 2016 using the radial velocity method, which measures the wobble a planet's gravity induces in its star's motion. HD 147873 b has a minimum mass of 1630 Earth masses, which is a lower bound on its true mass and roughly 5.14 times Jupiter's mass, and an orbital period of 117 days. HD 147873 c has a minimum mass of 731 Earth masses, also a lower bound and roughly 2.3 times Jupiter's mass, and an orbital period of 492 days. The minimum masses of both planets are larger than Earth's. Among the listed planets, HD 147873 b has the shortest year and the largest minimum mass, while HD 147873 c has the longest year and the smallest minimum mass.