Funding for this research was provided by:
Japan Society for the Promotion of Science (15K05273)
Centre National d’Etudes Spatiales
National Aeronautics and Space Administration (Contract NNM10AA11C issued through the New Frontiers Program)
NASA Emerging Worlds and Hayabusa2 Participating Scientist Programs
SERVII Center for Lunar Science and Exploration
European Union's Horizon 2020 Research and Innovation Programme (687378)
Received: 25 June 2018
Accepted: 29 October 2018
First Online: 11 December 2018
: KW is a PI of the International Regolith Science Group (IRSG) which is a branch of the Interdisciplinary Science Team in the Hayabusa2 project. KW, MG, PM, KJW, and HM are core members of IRSG.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.