2026-10-25까지 1년 동안 바깥쪽으로 이동한 속도의 보이저 1호(JPL Horizons). 운전: 쉬지 않고, 연료 보급 없이.
사실
HD 216520 c의 평형 온도는 −50~+50 °C입니다.
발견 방법
2020년 시선속도법으로 발견된 첫 행성 (NASA 외계행성 아카이브).
행성
HD 216520 c — 3 times Earth's width (estimated from its mass, not measured), a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 150 days; about 22 °C, between freezing and boiling; found in 2020 by radial velocity.
HD 216520 b — 3.2 times Earth's width (estimated from its mass, not measured), a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 35 days; about 210 °C, hotter than boiling water; found in 2020 by radial velocity.
NASA Exoplanet Archive, Planetary Systems Composite Parameters (fetched 2026-11-02). Composite values: where a planet's size or mass was not measured, the archive estimates it from the other.
This research has made use of the NASA Exoplanet Archive, which is operated by the California Institute of Technology, under contract with NASA under the Exoplanet Exploration Program.