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First asteroid gas sample delivered by the Hayabusa2 mission: A treasure box from Ryugu
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DOI：10.1126/sciadv.abo7239.png)
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Abstract
En 中文
The Hayabusa2 spacecraft returned to Earth from the asteroid 162173 Ryugu on 6 December 2020. One day after the recovery, the gas species retained in the sample container were extracted and measured on-site and stored in gas collection bottles. The container gas consists of helium and neon with an extraterrestrial He-3/He-4 and Ne-20/Ne-22 ratios, along with some contaminant terrestrial atmospheric gases. A mixture of solar and Earth's atmospheric gas is the best explanation for the container gas composition. Fragmentation of Ryugu grains within the sample container is discussed on the basis of the estimated amount of indigenous He and the size distribution of the recovered Ryugu grains. This is the first successful return of gas species from a near-Earth asteroid.
Keywords:
SOLAR-WIND NEON
NOBLE-GASES
HELIUM
SURFACE
ARGON
COLLECTION
METEORITES
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