Kepler-319 and Its Three Planets

Kepler-319 is a star located 1,640 light-years away, and it hosts three known planets. The star is estimated to be 3.55 billion years old, with a mass of 0.96 solar masses and a radius of 0.92 solar radii. Its temperature is 5,610 K. The star's reported mass and radius estimates are both smaller than the Sun's, and its reported temperature is cooler as well.

All three planets were discovered in 2014 by the transit method, in which a planet passes in front of its star from our viewpoint and causes a small dip in observed brightness. Repeated dips help establish orbital periods.

Kepler-319 b is classified as a Super-Earth, a size class that reaches up to 2.5 times Earth's radius. It has an orbital period of 4.36 days and a radius of 1.63 Earth radii, which is larger than Earth's. Among the listed planets, Kepler-319 b has the shortest year, at 4.36 days, and the smallest radius, at 1.63 Earth radii.

Kepler-319 c is a Neptune-like planet, a class that reaches up to 4 times Earth's radius. Its orbital period is 6.94 days, and its radius is 2.63 Earth radii, larger than Earth's. Among the listed planets, Kepler-319 c has the second-shortest year, at 6.94 days, and the largest radius, at 2.63 Earth radii.

Kepler-319 d is also a Super-Earth. It takes 31.8 days to complete one orbit and has a radius of 2.29 Earth radii, larger than Earth's. Among the listed planets, Kepler-319 d has the longest year, at 31.8 days, and the second-smallest radius, at 2.29 Earth radii.