GJ 876 c

It circles Gliese 876 once every 30.1 days, 0.13 AU out: about 3 times closer than Mercury is to the Sun.

Found in 2000 by the radial velocity method, which measures the star's wobble. That gives a minimum mass, so it could be heavier.

Sources

1. NASA Exoplanet Archive, Planetary Systems Composite Parameters (queried 28 Oct 2026)

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