Two papers on samples from the asteroid Ryugu brought back to Earth by the asteroid probe Hayabusa2(※1) have been published in the major British online journal Nature Astronomy(※2) on December 21, 2021 (Japan time).
These papers are based on the initial description of the returned by Hayabusa2 samples of Ryugu conducted at the curation facility(※4) of the JAXA(※3). The returned by Hayabusa2 samples show the overall characteristics of the asteroid as known from field observations, and it is clear that Ryugu is a primitive asteroid rich in water and organic matter.

Title:
Preliminary analysis of the Hayabusa2 samples returned from C-type asteroid Ryugu
https://www.nature.com/articles/s41550-021-01550-6
Lead Author:
YADA,Toru(JAXA Institute of Space and Astronautical Science)
UoA Co-authors::
KITAZATO,Kohei Associate Professor
HIRATA,Naru Senior Associate Professor
HONDA,Chikatoshi Associate Professor
JAXA Explanatory article:
Ryugu is a primitive asteroid rich in water and organic matter
─ A first look at the unprocessed carbonaceous asteroid sample returned by Hayabusa2 ─
https://www.isas.jaxa.jp/en/topics/002893.html

Title:
First compositional analysis of Ryugu samples by the MicrOmega hyperspectral microscope
https://www.nature.com/articles/s41550-021-01549-z
Lead Author:
Cedric Pilorget(Institut d'Astrophysique Spatiale, Université Paris-Saclay)
UoA Co-authors:
HIRATA,Naru Senior Associate Professor
KITAZATO,Kohei Associate Professor
JAXA Explanatory article:
A first look at the composition of the sample from asteroid Ryugu with the infrared spectroscopic microscope, MicrOmega.
https://www.isas.jaxa.jp/en/topics/002895.html

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