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HD 20781 c is a hot Neptune around the star HD 20781. The planet has a mass of 15.78 Earth masses [4] and it orbits with a semi-major axis of 0.3456 astronomical units and an orbital eccentricity of approximately 0.28.[2][4] With the same composition as Neptune, it would have a radius of 3.79 times that of the Earth. With the same composition as Earth, it would have a radius of 2.08 times that of the Earth. It orbits near the inner edge of the habitable zone of HD 20781.

HD 20781 c
Discovery
Discovery date2011,[1] announced in 2019 [2]
Detection method
Radial velocity [3]
Orbital characteristics
Semi-major axis
0.3456 ± 0.0047 AU,[2] 0.169 ± 0.003 AU[1]
Eccentricity0.28 ± 0.09,[2][4] 0.11 ± 0.06 [1]
Orbital period (sidereal)
85.131 ± 0.1161 d,[4] 13.9 d,[2] 29.15 ± 0.02 d[1]
Physical characteristics
Mean radius
2.17 R+[2]
Mass0.0496 Mj,[2] 1.43 Mj,[1] 5.33 M+,[2] 15.78 M+[4]

    References


    1. "HD 20781". Open Exoplanet Catalogue. Retrieved 4 April 2021.
    2. "Exoplanet Catalog HD 20781". NASA. Retrieved 4 April 2021.
    3. "Planet HD 20781 c". The Extrasolar Planet Encyclopaedia. Retrieved 2 January 2016.
    4. Mayor. "The HARPS search for southern extra-solar planets XXXVI. Eight HARPS multi-planet systems hosting 20 super-Earth and Neptune-mass companions". the Astrophysical Journal. 622. doi:10.1051/0004-6361/201731173.

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