Journal
SCIENCE
Volume 368, Issue 6491, Pages 654-+Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aaz6306
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Funding
- KAKENHI from the Japan Sc et for the Promotion of Saleilre [17H06459, 19H01951, I H05. 5, 17KK0097, 19H00727, 18H01267, 18K11610, 19803955, 16H04044, 19K03958]
- JSPS core-to-core program Intermationai Network of Plnetary Sciences
- NASA/Solar System Workings [9NHI7Z09001M8ONSS619K0548]
- Auburn Univ's intramural research grant
- OSIRIS-REx [INNMIOAA116]
- NASA Hayabusa2 Parthpating Scient Sr Program
- Frenon space agency CNES
- Academies of Exceilence: Complex systems and Space. environment, risk, and complex on part M the IDEX JEDI of the Universite Cote clAzur
- European Union's HorizoR 2020 research and innovation program [870377, 910-MAPP]
- NASA's EW program
- PDART program
- Grants-in-Aid for Scientific Research [19H01951, 19H00727, 19K03958, 18H01267, 17KK0097, 18K11610, 17H06459, 16H04044] Funding Source: KAKEN
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The near-Earth asteroid (162173) Ryugu is thought to be a primitive carbonaceous object that contains hydrated minerals and organic molecules. We report sample collection from Ryugu's surface by the Hayabusa2 spacecraft on 21 February 2019. Touchdown images and global observations of surface colors are used to investigate the stratigraphy of the surface around the sample location and across Ryugu. Latitudinal color variations suggest the reddening of exposed surface material by solar heating and/or space weathering. Immediately after touchdown, Hayabusa2's thrusters disturbed dark, fine grains that originate from the redder materials. The stratigraphic relationship between identified craters and the redder material indicates that surface reddening occurred over a short period of time. We suggest that Ryugu previously experienced an orbital excursion near the Sun.
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