HD 22946 and Its Three Known Planets

HD 22946 is a star 205 light-years away with a spectral type of F7/F8V and three planets. The star is roughly 5 billion years old, has a mass of 1.1 solar masses, a radius of 1.16 solar radii, and a temperature of 6040 K. Its reported mass, radius, and temperature are all described as larger or hotter than the Sun's.

The planets orbit closely and are all reported through transit detections. TOI-411 b was reported in 2022 as an Earth-like planet, with an orbital period of 4.04 days, a radius of 1.36 Earth radii, and a mass reported as an upper limit of 13.71 Earth masses. TOI-411 c, also reported in 2022, is a Super-Earth with an orbital period of 9.57 days, a radius of 2.33 Earth radii, and a mass reported as an upper limit of 9.72 Earth masses. HD 22946 d, reported in 2023, is Neptune-like, with an orbital period of 47.4 days, a radius of 2.61 Earth radii, and a mass reported as an upper limit of 26.57 Earth masses.

Among the listed planets, TOI-411 b has the shortest year, at 4.04 days, and the smallest radius, at 1.36 Earth radii. TOI-411 c has the second-shortest year, at 9.57 days, and the second-smallest radius, at 2.33 Earth radii. HD 22946 d has the longest year, at 47.4 days, and the largest radius, at 2.61 Earth radii. Each planet's reported radius is larger than Earth's.