| タイトル | The composition and origin of the C, P, and D asteroids - Water as a tracer of thermal evolution in the outer belt |
| 著者（英） | Jones, Thomas D.; Lebofsky, Larry A.; Marley, Mark S.; Lewis, John S. |
| 著者所属（英） | NASA Ames Research Center|NASA Johnson Space Center|Arizona Univ. |
| 発行日 | 1990-11-01 |
| 言語 | eng |
| 内容記述 | A telescopic and laboratory investigation of water distribution among low albedo asteroids in the outer belt, using the 3-micron reflectance absorption of molecular H2O and structural OH ions (coincident with the 3-micron spectral signature of meteorite and asteroid hydrated silicates) shows that 66 percent of the C-class asteroids in the sample have hydrated silicate surfaces. In conjunction with the apparently anhydrous P and D surfaces, this pronounced hydration difference between C-class asteroids and the more distant P and D classes points to an original outer belt asteroid composition of anhydrous silicates, water ice, and complex organic material. Early solar-wind induction heating of protoasteroids, declining in intensity with distance from the sun, is conjectured to have produced the observed diminution of hydrated silicate abundance. |
| NASA分類 | LUNAR AND PLANETARY EXPLORATION |
| レポートNO | 91A16348 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/351613 |
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