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The advent of a new generation of radial velocity instruments has allowed usto break the one Earth-mass barrier. We report a new milestone in this contextwith the detection of the lowest-mass planet measured so far using radialvelocities: L 98-59 b, a rocky planet with half the mass of Venus. It is partof a system composed of three known transiting terrestrial planets (planets bto d). We announce the discovery of a fourth nontransiting planet with aminimum mass of 3.06_{-0.37}^{+0.33} MEarth and an orbital period of12.796_{-0.019}^{+0.020} days and report indications for the presence of afifth nontransiting terrestrial planet. With a minimum mass of2.46_{-0.82}^{+0.66} MEarth and an orbital period 23.15_{-0.17}^{+0.60} days,this planet, if confirmed, would sit in the middle of the habitable zone of theL 98-59 system.  L 98-59 is a bright M dwarf located 10.6 pc away. Positioned at the border ofthe continuous viewing zone of the James Webb Space Telescope, this system isdestined to become a corner stone for comparative exoplanetology of terrestrialplanets. The three transiting planets have transmission spectrum metricsranging from 49 to 255, which makes them prime targets for an atmosphericcharacterization with the James Webb Space Telescope, the Hubble SpaceTelescope, Ariel, or ground-based facilities such as NIRPS or ESPRESSO. With anequilibrium temperature ranging from 416 to 627 K, they offer a uniqueopportunity to study the diversity of warm terrestrial planets.  L 98-59 b and c have densities of 3.6_{-1.5}^{+1.4} and 4.57_{-0.85}^{+0.77}g.cm^{-3}, respectively, and have very similar bulk compositions with a smalliron core that represents only 12 to 14 % of the total mass, and a small amountof water. However, with a density of 2.95_{-0.51}^{+0.79} g.cm^{-3} and despitea similar core mass fraction, up to 30 % of the mass of L 98-59 d might bewater.

Warm terrestrial planet with half the mass of Venus transiting a nearby star