HD 89345 and Its Jupiter-Like Planet

HD 89345 is a G-type star 432 light-years from Earth. Its spectral type is given simply as G5, and its measured temperature is 5500 K. The star is older than the Sun at 9.4 billion years, with a mass of 1.12 solar masses and a radius of 1.66 solar radii; both its mass and radius are larger than the Sun's, while its temperature is cooler. One planet orbits it.

That planet, HD 89345 b, was discovered in 2018 by the transit method, in which a planet passes in front of its star and produces a small dip in observed brightness. Its orbital period is 11.8 days, and its radius of 7.4 Earth radii places it in the Jupiter-like size class, reserved for planets exceeding four times Earth's radius. Its mass is 35 Earth masses, larger than Earth's, and its mean density is 0.476 g/cm³, or 0.0863 times Earth's.