TOI-5624 d is the third and largest discovered exoplanet orbiting the star TOI-5624, with a size approximately three and a half times the diameter of Earth. The planet was confirmed in late April 2026 using the transit method.
Characteristics Physical characteristics
This planet is a puffy sub-Neptune. Its mass equals , and its radius is . This makes it the largest in radius among the four transiting bodies in the system. The average density is extremely low, about , which is comparable to the density of Saturn. This suggests the presence of an extended and massive atmosphere, constituting a significant part of the planet's volume. Consequently, the planet has a high transmission signal, making it a priority target for atmospheric studies using the James Webb Space Telescope.
Orbit The planet's orbital period is Earth days at an average distance from its parent star of . The equilibrium temperature is estimated at 712.6 K, or 439.45 °C.
See also List of exoplanets discovered in 2026 Methods of detecting exoplanets
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