Abstract
Abstract We report on the discovery of HAT-P-38b, a Saturn-mass exoplanet, transiting the $ V$$ =$ 12.56 dwarf star GSC 2314-00559 on a $ P$$ =$ 4.6404 d circular orbit. The host star is a 0.89 $ M_{\odot}$ late G dwarf, with solar metallicity and a radius of 0.92 $ R_{\odot}$ . The planetary companion has a mass of 0.27 $ M_{\rm J}$ and a radius of 0.82 $ R_{\rm J}$ . HAT-P-38b is one of the planets the mass and radius of which have ever been discovered to be the closest to those of Saturn.
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