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An artist’s rendering of the Neptune-like exoplanet TOI-1231b. Image credit: NASA / JPL-Caltech.
An artist’s rendering of the Neptune-like exoplanet TOI-1231b. Image credit: NASA / JPL-Caltech

PLANET TYPE – Neptune-like

DISCOVERY DATE – 2021

MASS – 15.4 Earths

PLANET RADIUS – 0.326 x Jupiter

ORBITAL RADIUS – 0.1288 AU

ORBITAL PERIOD – 24.2 days

ECCENTRICITY – 0.09

DETECTION METHOD – Transit*

*When a planet passes directly between an observer and the star it orbits, it blocks some of that star’s light. For a brief period of time, that star actually gets dimmer. It’s a tiny change, but it’s enough to clue astronomers into the presence of an exoplanet around a distant star.

2021. Discovery.

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