Discovery date 2011 Semi-major axis 0.3456 ± 0.0047 AU Orbital period 85.131 ± 0.1161 d | Detection method Radial velocity Eccentricity 0.28 ± 0.09 Mass 0.0496 Mj | |
HD 20781 c is a hot Neptune with 15.8 Earth masses. It is the outermost planet of orbiting its parent star HD 20781 in about 0.3456 astronomical units in somewhat eccentric orbit. With the same composition as Neptune, it would have a radius of 3.79 earths. With the same composition as Earth, it would have a radius of 2.08 earths. It orbits near the inner edge of the habitable zone.
References
HD 20781 c Wikipedia(Text) CC BY-SA