description TOI-178 e Overview
TOI-178 e is a transiting planet in the six-planet TOI-178 system, orbiting a late K-type star about once every 10 days. It lies within the system's chain of Laplace resonances, which involves planets c through g and relates their orbital periods through repeated integer combinations. The TOI-178 planets span the super-Earth to mini-Neptune regime, but their densities vary substantially, making the system useful for comparative studies of planetary formation.
help TOI-178 e FAQ
What are TOI-178 e's orbital period and size?
TOI-178 e orbits its late K-type star in about 10 days. Its radius is roughly 2.3 times Earth's, placing it near the super-Earth to mini-Neptune transition. ([NASA Exoplanet Archive](https://exoplanetarchive.ipac.caltech.edu/overview/TOI-178))
Which planets are linked with TOI-178 e in the resonance chain?
TOI-178 e is linked with planets c, d, f, and g in the reported Laplace-resonance chain. Planet b is the innermost planet and is outside that c-through-g sequence.
Is TOI-178 e the outermost planet in its system?
No, TOI-178 e sits between the shorter-period planets d and the longer-period planets f and g. TOI-178 g is the outermost known planet and takes about 20.7 days to orbit.
How do astronomers observe TOI-178 e?
It is a transiting planet, so its orbit is measured from repeated changes in the star's brightness. Its roughly 10-day period helps place it inside the compact resonance architecture of TOI-178.
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