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We investigated the hydrogen isotopic compositions and water contents ofpyroxenes in two recent ordinary chondrite falls, namely, Chelyabinsk (2013fall) and Benenitra (2018 fall), and compared them to three ordinary chondriteAntarctic finds, namely Graves Nunataks GRA 06179, Larkman Nunatak LAR 12241,and Dominion Range DOM 10035. The pyroxene minerals in Benenitra andChelyabinsk are hydrated ($\sim$0.018-0.087 wt.$\%$ H$_2$O) and show D-poorisotopic signatures ($\delta$D$_{SMOW}$ from -444$\unicode{x2030}$ to-49$\unicode{x2030}$). On the contrary, the ordinary chondrite finds exhibitevidence of terrestrial contamination with elevated water contents($\sim$0.039-0.174 wt.$\%$) and values (from -199$\unicode{x2030}$ to-14$\unicode{x2030}$). We evaluated several small parent body processes thatare likely to alter the measured compositions in Benenitra and Chelyabinsk, andinferred that water-loss in S-type planetesimals is minimal during thermalmetamorphism. Benenitra and Chelyabinsk hydrogen compositions reflect a mixedcomponent of D-poor nebular hydrogen and water from the D-rich mesostases.45-95$\%$ of water in the minerals characterized by low $\delta$D$_{SMOW}$values was contributed by nebular hydrogen. S-type asteroids dominantlycomposed of nominally anhydrous minerals can hold 254-518 ppm of water.Addition of a nebular water component to nominally dry inner Solar Systembodies during accretion suggests a reduced need of volatile delivery to theterrestrial planets during late accretion.

New evidence for wet accretion of inner solar system planetesimals from meteorites Chelyabinsk andBenenitra