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Science, 2022
`Voir en ligne : https://www.science.org/doi/10.1126/science.abj8624
Abstract :
The Hayabusa2 spacecraft investigated the C-type (carbonaceous) asteroid (162173) Ryugu. The mission performed two landing operations to collect samples of surface and sub-surface material, the latter exposed by an artificial impact. We present images of the second touchdown site, finding that ejecta from the impact crater was present at the sample location. Surface pebbles at both landing sites show morphological variations ranging from rugged to smooth, similar to Ryugu’s boulders, and shapes from quasi-spherical to flattened. The samples were returned to Earth on 2020 December 6. We describe the morphology of >5 g of returned pebbles and sand. Their diverse color, shape and structure are consistent with the observed materials of Ryugu ; we conclude they are a representative sample of the asteroid