A transiting super-Earth close to the inner edge of the habitable zone of an M0 dwarf star

We present a super-Earth orbiting close to the inner edge of the habitable zone of the cool dwarf star K2-286 (EPIC 249889081), detected with data from the K2 mission in its 15th campaign. The planet has radius of 2.1 +/- 0.2 R-circle plus, near the 1.5-2.0 R-circle plus gap in the radii distribution. The equilibrium temperature is 347(-11)(+21) K, cooler than most of the small planets with wellmeasured masses, and the orbital period is 27.359 +/- 0.005 d. K2-286, located at a distance of 76.3 +/- 0.3 pc, is an M0V star with estimated effective temperature of 3926 +/- 100 K, less active than other M dwarf stars hosting exoplanets. The expected radial velocity semiamplitude induced by the planet on the star is 1.9(-1.2)(+1.3) ms(-1), and the amplitude of signals in transit transmission spectroscopy is estimated at 5.0 +/- 3.0 ppm. Follow-up observations for mass measurements and transit spectroscopy should be desirable for this relatively bright target (m(V) = 12.76, m(Ks) = 9.32) hosting a transiting super-Earth within the inner edge of the habitable zone.