HD 200964 and Its Two Known Planets

HD 200964 is a G8 IV star located 237 light-years from Earth. This single-star system hosts two known planets, both discovered in 2010 using the radial velocity method, which measures the wobble a planet's gravity induces in its star's motion. The star is estimated to be 1.23 billion years old and has a reported mass of 1.99 solar masses, a radius of 9.16 solar radii, and a temperature of 5100 K.

The two planets orbit the same host. HD 200964 b has a minimum mass of 508 Earth masses and an orbital period of 606 days. HD 200964 c has a minimum mass of 386 Earth masses and an orbital period of 853 days. A minimum mass is a lower bound on a planet's true mass.

Among the listed planets, HD 200964 b has the shortest year by reported estimates, at 606 days, and HD 200964 c has the longest, at 853 days. HD 200964 b's minimum mass is roughly 1.6 times Jupiter's mass, while HD 200964 c's is roughly 1.21 times Jupiter's mass. HD 200964 c has the smallest minimum mass among the listed planets, at 386 Earth masses, and HD 200964 b has the largest, at 508 Earth masses.

The star's reported mass estimate is larger than the Sun's, and its reported radius estimate is also larger than the Sun's. Its reported temperature is cooler than the Sun's.