| Project/Area Number |
60460056
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
鉱物学(含岩石・鉱床学)
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| Research Institution | College of Arts and Sciences, University of Tokyo |
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Principal Investigator |
MIYAMOTO Masamichi College of Arts and Sci., University of Tokyo, Research associate., 教養部, 助手 (70107944)
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| Co-Investigator(Kenkyū-buntansha) |
FUJII Naoyuki Dept. of Earth Sciences, Faculty of Sci., Kobe Univ., Professor., 理学部, 教授 (60011631)
TAKEDA Hiroshi Mineralogical Institute, Faculty of Sci., Univ. of Tokyo, Professor., 理学部, 教授 (50011523)
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| Project Period (FY) |
1985 – 1986
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| Project Status |
Completed (Fiscal Year 1986)
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| Budget Amount *help |
¥7,700,000 (Direct Cost: ¥7,700,000)
Fiscal Year 1986: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1985: ¥7,200,000 (Direct Cost: ¥7,200,000)
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| Keywords | Remote sensing / Infrared spectra / Reflectance spectra / Asteroids / Meteorites / Rock-forming minerals / Planetary surface materials / 惑星科学 |
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| Research Abstract |
1. We measured diffuse infrared reflectances (2.53-25 <maicro> m) of minerals and meteorites by using a Fourier transform infrared spectrophotometer (JASCO FT/IR-3) to better understand the surface mineral assemblage of asteroids.
2. We developed some programs to process infrared spectral data including a program to draw spectral curves.
3. C2 carbonaceous chondrite materials can be distinguished from C3 carbonaceous chondrite materials by the depth of the hydration bands around 3 and 6 <maicro> m. This enable us to better understand the mineral assemblage of C-type asteroids.
4. Enstatite chondrite materials show many absorption bands at the wavelength longer than about 9 <maicro> m whereas iron meteorite materials do not show any absorption bands up to 25 <maicro> m. This result gives us information on the surface composition of M-type asteroids.
5. Fine-grained materials determine the spectral features seen in diffuse reflectances.
6. We speculate that the surface composition of asteroid 16 Psyche is the enstatite chondrite-like assemblage, not the iron meteorite-like assemblage on the basis of spectral features around 10 <maicro> m.
7. We need infrared measurements of high enough quality of asteroids.
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