K2-99 c — 13 times Earth's width (estimated from its mass, not measured), a giant, Jupiter-sized or more; its year lasts 520 days; about 120 °C, hotter than boiling water; found in 2022 by radial velocity.
K2-99 b — 12 times Earth's width, a giant, Jupiter-sized or more; its year lasts 18 days; about 910 °C, hotter than boiling water; found in 2016 by transit.
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.