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We present the discovery of two transiting exoplanets. HAT-P-28b orbits aV=13.03 G3 dwarf star with a period P = 3.2572 d and has a mass of 0.63 +- 0.04MJ and a radius of 1.21 + 0.11 -0.08 RJ yielding a mean density of 0.44 +- 0.09g cm-3. HAT-P-29b orbits a V=11.90 F8 dwarf star with a period P = 5.7232 d andhas a mass of 0.78 +0.08 -0.04 MJ and a radius of 1.11 +0.14 -0.08 RJ yieldinga mean density of 0.71 +- 0.18 g cm-3. We discuss the properties of theseplanets in the context of other known transiting planets.

HAT-P-28b and HAT-P-29b: Two Sub-Jupiter Mass Transiting Planets