期刊
SCIENCE
卷 364, 期 6437, 页码 272-+出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aav7432
关键词
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资金
- JAXA
- Hayabusa2 project
- CNES
- ASI
- NASA Hayabusa2 Participating Scientist Program [NNX17AL02G, NNX16AL34G]
- JSPS [16H04044, 17H06459, 17K05639]
- JSPS Core-to-Core Program [17H01175]
- NASA's Emerging Worlds Program [NNX17AK46G]
- European Union's H2020 program [664931]
- Grants-in-Aid for Scientific Research [17H06459, 17H01175, 16H04044, 17K05639] Funding Source: KAKEN
- NASA [901403, NNX16AL34G] Funding Source: Federal RePORTER
The near-Earth asteroid 162173 Ryugu, the target of the Hayabusa2 sample-return mission, is thought to be a primitive carbonaceous object. We report reflectance spectra of Ryugu's surface acquired with the Near-Infrared Spectrometer (NIRS3) on Hayabusa2, to provide direct measurements of the surface composition and geological context for the returned samples. A weak, narrow absorption feature centered at 2.72 micrometers was detected across the entire observed surface, indicating that hydroxyl (OH)-bearing minerals are ubiquitous there. The intensity of the OH feature and low albedo are similar to thermally and/or shock-metamorphosed carbonaceous chondrite meteorites. There are few variations in the OH-band position, which is consistent with Ryugu being a compositionally homogeneous rubble-pile object generated from impact fragments of an undifferentiated aqueously altered parent body.
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