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We report on the discovery and validation of TOI 813b (TIC 55525572 b), atransiting exoplanet identified by citizen scientists in data from NASA'sTransiting Exoplanet Survey Satellite (TESS) and the first planet discovered bythe Planet Hunters TESS project. The host star is a bright (V = 10.3 mag)subgiant ($R_\star=1.94\,R_\odot$, $M_\star=1.32\,M_\odot$). It was observedalmost continuously by TESS during its first year of operations, during whichtime four individual transit events were detected. The candidate passed all thestandard light curve-based vetting checks, and ground-based follow-upspectroscopy and speckle imaging enabled us to place an upper limit of $2M_{Jup}$ (99 % confidence) on the mass of the companion, and to statisticallyvalidate its planetary nature. Detailed modelling of the transits yields aperiod of $83.8911_{ - 0.0031 } ^ { + 0.0027 }$ days, a planet radius of $6.71\pm 0.38$ $R_{\oplus}$, and a semi major axis of $0.423_{ - 0.037 } ^ { + 0.031}$ AU. The planet's orbital period combined with the evolved nature of the hoststar places this object in a relatively under-explored region of parameterspace. We estimate that TOI-813b induces a reflex motion in its host star witha semi-amplitude of $\sim6$ ms$^{-1}$, making this system a promising target tomeasure the mass of a relatively long-period transiting planet.

Planet Hunters TESS I: TOI 813, a subgiant hosting a transiting Saturn-sized planet on an 84-day orbit