Pellas-Ryder Award for 2021 to Jan L. Hellmann

Jan L. Hellmann, currently a postdoc at the Institut für Planetologie, University of Münster, Germany, is awarded the 2021 Pellas-Ryder Award for his paper titled “Origin of volatile element depletion among carbonaceous chondrites” published in Earth & Planetary Science Letters in 2020. Jan Hellmann was a PhD student at the Institut für Planetologie, University of Münster, working with Thorsten Kleine, when the paper was submitted. He analyzed the isotopic composition of tellurium, a moderately volatile element, in carbonaceous chondrites to find that mass-dependent Te isotope fractionation correlated with matrix mass fraction and nucleosynthetic chromium (Cr-54) isotope compositions. More…


Pellas-Ryder Award for 2020 to Sabina D. Raducan

Sabina D. Raducan, currently a PhD student in the Department of Earth Science and Engineering at Imperial College, London, is awarded the 2020 Pellas-Ryder Award for her paper titled “The role of asteroid strength, porosity and internal friction in impact momentum transfer” published in Icarus in 2019. More…


Pellas-Ryder Award for 2019 to Simon Lock

Simon J. Lock, currently a postdoc at the California Institute of Technology, is awarded the 2019 Pellas-Ryder Award for his paper titled “The Origin of the Moon within a Terrestrial Synestia” published in the Journal of Geophysical Research Planets in 2018. Simon Lock was a Ph.D student at the Department of Earth and Planetary Sciences, Harvard University, working with Sarah T. Stewart (now at UC Davis), when the paper was submitted. More…


Pellas-Ryder Award for 2018 to Emily Worsham

Emily Worsham, currently a postdoc at the University of Muenster, is awarded the 2018 Pellas-Ryder award for her paper titled "Characterizing cosmochemical materials with genetic affinities to the Earth: Genetic and chronological diversity within the IAB iron meteorite complex," published in the Earth and Planetary Science Letters in 2017. More…