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Based on photometric observations by TESS, we present the discovery of aVenus-sized planet transiting LHS 475, an M3 dwarf located 12.5 pc from theSun. The mass of the star is $0.274 \pm 0.015~\rm{M_{Sun}}$. The planet,originally reported as TOI 910.01, has an orbital period of $2.0291025 \pm0.20$ days and an estimated radius of $0.955 \pm 0.053~\rm{R_{Earth}}$. Weconfirm the validity and source of the transit signal with MEarth ground-basedfollow-up photometry of five individual transits. We present radial velocitydata from CHIRON that rule out massive companions. In accordance with theobserved mass-radius distribution of exoplanets as well as planet formationtheory, we expect this Venus-sized companion to be terrestrial, with anestimated RV semi-amplitude close to 1.0 m/s. LHS 475 b is likely too hot to behabitable but is a suitable candidate for emission and transmissionspectroscopy.

LHS 475 b: A Venus-sized Planet Orbiting a Nearby M Dwarf