HD 5319 and Its Two Known Planets

HD 5319 is a star 396 light-years from Earth with two planets known to orbit it. The host is a K3 IV star with an age of 3.1 billion years, a mass of 1.51 solar masses, a radius of 3.85 solar radii, and a temperature of 4960 K. Its reported mass and radius are larger than the Sun's, while its reported temperature is cooler than the Sun's.

Both planets were found by the radial velocity method, which detects the wobble a planet's gravity induces in its star's motion; repeated wobbles reveal the planet and its orbital period. HD 5319 b was discovered in 2007, and HD 5319 c in 2014.

HD 5319 b has a minimum mass of 495 Earth masses and an orbital period of 637 days. Its minimum mass is larger than Earth's and roughly 1.56 times Jupiter's mass. Among the listed planets, HD 5319 b has the shortest year by reported estimates, at 637 days, and the largest minimum mass, at 495 Earth masses.

HD 5319 c has a minimum mass of 335 Earth masses and an orbital period of 872 days. Its minimum mass is larger than Earth's. Among the listed planets, HD 5319 c has the longest year by reported estimates, at 872 days, and the smallest minimum mass, at 335 Earth masses.