description TOI-178 c Overview
TOI-178 c is a transiting exoplanet with a radius about 1.75 times Earth's and an orbital period of roughly 3.2 days. It orbits a late K-type star in the six-planet TOI-178 system and is one of the planets participating in the system's chain of Laplace resonances. Its measured density is substantially higher than that of neighboring TOI-178 d, illustrating the system's unusual variation in bulk composition.
help TOI-178 c FAQ
What are TOI-178 c's size and orbital period?
TOI-178 c has a radius of about 1.75 Earth radii and completes an orbit in roughly 3.2 days. It is a transiting planet in the compact six-planet TOI-178 system. ([NASA Exoplanet Archive](https://exoplanetarchive.ipac.caltech.edu/overview/TOI-178))
What is TOI-178 c's role in the resonance chain?
TOI-178 c is the innermost member of the reported c-through-g Laplace-resonance chain. The chain is commonly written as 2:4:6:9:12 in period relationships.
Why is TOI-178 c scientifically interesting?
Its measured bulk density is much higher than that of neighboring TOI-178 d in the published system analysis. That contrast shows that planets with nearby or related orbits can have very different internal compositions.
How was TOI-178 c detected?
It was confirmed through transit observations, meaning the planet periodically crosses the face of its star and slightly dims the starlight. The host is a late K-type star known as TOI-178.
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