Planet Hunters TESS III: two transiting planets around the bright G dwarf HD 152843

We report on the discovery and validation of a two-planet system around bright (V = 8.85 mag) early G dwarf (1.43 $R_{\odot}$, 1.15 $M_{\odot}$, TOI 2319) using data from NASA's Transiting Exoplanet Survey Satellite (TESS). Three transit events two planets were detected by citizen scientists in month-long TESS light curve (sector 25), as part Planet Hunters project. Modelling transits yields an orbital period \Pb\ radius $3.41 _{ - 0.12 } ^ { + 0.14 }$ $R_{\oplus}$ for inner planet, range 19.26-35 days $5.83 outer which was only seen to once. Each signal independently statistically validated, taking into consideration well ground-based spectroscopic follow-up observations. Radial velocities HARPS-N EXPRES yield tentative detection planet b, whose mass we estimate be $11.56 6.14 6.58 $M_{\oplus}$, allow us place upper limit $27.5$ $M_{\oplus}$ (99 per cent confidence) c. Due brightness host star strong likelihood extended H/He atmosphere both planets, this offers excellent prospects atmospheric characterisation comparative planetology.