HD 65216 and Its Two Known Planets

HD 65216 is a star 115 light-years away with two known planets, both discovered by the radial velocity method, which measures the wobble a planet's gravity induces in its star's motion. The host is a G5 V star, a main-sequence dwarf of the same broad temperature class as the Sun. Its spectral type is given as G5 V. The star is 4 billion years old, has 0.9 solar masses, a radius of 0.86 solar radii, and a temperature of 5630 K. Its reported radius is smaller than the Sun's, and its reported temperature is cooler than the Sun's.

HD 65216 b was discovered in 2003. Its minimum mass is 412 Earth masses, meaning its true mass is at least that much, and it completes an orbit in 578 days. That minimum mass is larger than Earth's and roughly 1.3 times Jupiter's mass. Among the listed planets, HD 65216 b has the shortest year by reported estimates, at 578 days, and the smallest minimum mass, at 412 Earth masses.

HD 65216 c was discovered in 2013. Its minimum mass is 645 Earth masses, again a lower bound on its true mass, and its orbital period is 5370 days. Its minimum mass is larger than Earth's and roughly 2.03 times Jupiter's mass. Among the listed planets, it has the longest year by reported estimates, at 5370 days, and the largest minimum mass, at 645 Earth masses.