HD 11964 and Its Two Known Planets

HD 11964 is a star 109 light-years away with a spectral type of G8 IV. It has an age of 7.45 billion years, a mass of 1.1 solar masses, a radius of 1.95 solar radii, and a temperature of 5320 K. The star's reported mass estimate is larger than the Sun's, its reported radius estimate is larger than the Sun's, and its reported temperature is cooler than the Sun's. Two planets are known to orbit this host.

Both planets were found by the radial velocity method, which measures the wobble a planet's gravity induces in its star's motion; repeated wobbles reveal the planet and its orbital period. HD 11964 b was discovered in 2005 and has a minimum mass of 198 Earth masses and an orbital period of 1950 days. HD 11964 c was discovered in 2008 and has a minimum mass of 25 Earth masses and an orbital period of 37.9 days. Among the listed planets, HD 11964 c has the shortest year by reported estimates, at 37.9 days, and the smallest minimum mass, at 25 Earth masses, while HD 11964 b has the longest year by reported estimates, at 1950 days, and the largest minimum mass, at 198 Earth masses. The minimum masses of both planets are larger than Earth's.