GJ 3293 and Its Four Known Planets

GJ 3293 is a small, cool red dwarf of spectral type M2.5, located 65.9 light-years from Earth. Its reported mass is 0.42 solar masses, its radius is 0.404 solar radii, and its temperature is 3470 K - all smaller or cooler than the corresponding values for the Sun. Four planets have been found in orbit around this star.

GJ 3293 e has a minimum mass of 3.28 Earth masses and an orbital period of 13.3 days. GJ 3293 b has a minimum mass of 23.5 Earth masses and a period of 30.6 days. GJ 3293 d has a minimum mass of 7.6 Earth masses and a period of 48.1 days. GJ 3293 c has a minimum mass of 21.1 Earth masses and a period of 123 days.

All four planets have minimum masses larger than Earth's. Among them, GJ 3293 e has the smallest minimum mass, while GJ 3293 b has the largest, with GJ 3293 d and GJ 3293 c falling in between as the second-smallest and second-largest, respectively. GJ 3293 e also has the shortest reported year, and GJ 3293 c the longest, with GJ 3293 b and GJ 3293 d occupying the second-shortest and second-longest positions.

The planets were detected using the radial velocity method, which measures the wobble a planet's gravity induces in its star's motion. GJ 3293 b and GJ 3293 c were announced in 2015, and GJ 3293 d and GJ 3293 e in 2017.