Three Circumbinary Planets Around 2MASS J19383260+4603591

The host star 2MASS J19383260+4603591 lies 1290 light-years away and has a reported mass of 0.48 solar masses, a radius of 0.203 solar radii, and a temperature of 29600 K. Its mass and radius are smaller than the Sun's, while its temperature is hotter. Three planets are known to orbit this host, all of them circumbinary, meaning each orbits both stars of the binary system rather than one star alone.

2MASS J19383260+4603591 b was discovered in 2015 by eclipse timing variations. Its minimum mass is 591 Earth masses, roughly 1.86 times Jupiter's mass, and its orbital period is 406 days. Kepler-451 c and Kepler-451 d were both discovered in 2022 by the same method. Kepler-451 c has a minimum mass of 512 Earth masses, roughly 1.61 times Jupiter's mass, and an orbital period of 1460 days. Kepler-451 d has a minimum mass of 559 Earth masses, roughly 1.76 times Jupiter's mass, and an orbital period of 43 days.

Each minimum mass exceeds Earth's. Among the listed planets, Kepler-451 d has the shortest year by reported estimates, at 43 days, and Kepler-451 c has the longest, at 1460 days; 2MASS J19383260+4603591 b has the second-shortest at 406 days. Kepler-451 c has the smallest minimum mass among the listed planets, at 512 Earth masses, while 2MASS J19383260+4603591 b has the largest, at 591 Earth masses, and Kepler-451 d has the second-smallest, at 559 Earth masses.