description TOI-178 b Overview
TOI-178 b is a transiting super-Earth-sized exoplanet with a radius close to 1.2 Earth radii and an orbital period of about 1.9 days. It is the innermost known planet around the late K-type star TOI-178. The system also contains five more transiting planets, but the main 2:4:6:9:12 Laplace-resonance chain involves the outer five rather than b.
help TOI-178 b FAQ
How long is a year on TOI-178 b?
TOI-178 b completes one orbit in about 1.9 days. It is the innermost known planet in the six-planet TOI-178 system. ([NASA Exoplanet Archive](https://exoplanetarchive.ipac.caltech.edu/overview/TOI-178))
Is TOI-178 b part of the system's Laplace-resonance chain?
No, the reported 2:4:6:9:12 chain involves planets c through g. TOI-178 b orbits inside that chain and is treated as the innermost exception.
What kind of exoplanet is TOI-178 b?
It is a transiting super-Earth around a late K-type star. Its radius is close to 1.2 times Earth's, and one catalog solution gives it a mass near 1.5 Earth masses.
How does TOI-178 b compare with TOI-178 c?
TOI-178 b is smaller, at roughly 1.2 Earth radii, and orbits in about 1.9 days. TOI-178 c is about 1.75 Earth radii and takes roughly 3.2 days to orbit the same star.
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