Science
Astronomers Discover a Temperate Super-Earth in the Habitable Zone of a Red Dwarf Star Just 28 Light Years From Earth
Italian and Brazilian astronomers announced the detection of Ross 318 b, a temperate super-Earth orbiting the nearby M-dwarf star Ross 318 at a distance of about 28 light years in the constellation Cetus. Published on arXiv in May 2026, the discovery paper reports a minimum mass of 6.21 Earth masses, an orbital period of 39.63 days at 0.16 AU, and an equilibrium temperature of 237 Kelvin, placing the planet firmly within the conservative habitable zone defined by Kopparapu et al. The planet was detected via the radial velocity method using 412 epochs of HARPS and CARMENES spectra spanning 8.4 years. Its proximity makes Ross 318 b a prime candidate for future atmospheric characterization by the Habitable Worlds Observatory in the 2040s.
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