Kepler-257 d is a Neptune-like exoplanet that orbits a G-type star. Its mass is 21.7 Earths, it takes 24.7 days to complete one orbit of its star, and is 0.16 AU from its star. Its discovery was announced in 2014.

PLANET TYPE
Neptune-like
DISCOVERY DATE
2014
MASS
21.7 Earths
PLANET RADIUS
0.442 x Jupiter
ORBITAL RADIUS
0.16 AU
ORBITAL PERIOD
24.7 days
ECCENTRICITY
0.0
DETECTION METHOD