Kepler-32: A Cool Red Dwarf and Its Five Known Planets

Kepler-32 is an M1 V star, a small, cool red dwarf, located 1060 light-years away. Its reported mass estimate is 0.57 solar masses and its reported radius estimate is 0.54 solar radii, both smaller than the Sun's. With a reported temperature of 3900 K, it is cooler than the Sun. The star's reported age is 2.69 billion years.

Five planets are known to orbit Kepler-32. All five were found by the transit method. Kepler-32 b and Kepler-32 c were both discovered in 2011, while Kepler-32 d, Kepler-32 e, and Kepler-32 f were all discovered in 2012.

Kepler-32 b is classified as a Super-Earth, with a reported radius estimate of 2.2 Earth radii, larger than Earth's, and a reported upper limit of 1303 Earth masses. Its orbital period is 5.9 days. Kepler-32 c is also a Super-Earth, with a reported radius estimate of 2 Earth radii, larger than Earth's, a reported upper limit of 158.9 Earth masses, and an orbital period of 8.75 days. Kepler-32 d is classified as Neptune-like and has the largest radius among the listed planets by reported estimates, 2.7 Earth radii, larger than Earth's. Its orbital period is 22.8 days, the longest year among the listed planets. Kepler-32 e is a Super-Earth with the second-smallest radius among the listed planets by reported estimates, 1.5 Earth radii, larger than Earth's, and the second-shortest year among the listed planets, 2.9 days. Kepler-32 f is classified as a Sub-Earth and has the smallest radius among the listed planets by reported estimates, 0.82 Earth radii, smaller than Earth's. Its orbital period is 0.743 days, the shortest year among the listed planets.