Spectral reflectance (0.25-2.5μm) of powdered olivines and meteorites, and their bearing on surface materials of asteroids
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概要
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Spectral reflectance changes with the particle size, the thickness of the sample, the species of the background materials, and effects of carbon black were examined on powdered samples of sized olivines and some meteorites in the 0.25-2.5μm wavelength region. The effects of the pulverization on the spectral changes are dependent mainly on very fine-grained materials (e.g.<46μm) in the sample. These spectral changes of meteorites are as follows : 1) The albedo increases; 2) The spectra 'redden' in the range of about 1.6-2.5μm; 3) The absorption band strengths in the region of about 0.5-1.5μm become weak and broad; 4) The reflectance near 0.4μm is raised; 5) The sharp drop-off less than 0.35μm is found. The thickness of the sample has little effect on the reflectance spectra when the sample is more than 0.2mm thick, while a very thin sample (<0.1mm) reduces spectral contrast. When the background material has low reflectivity such as some meteorites, the spectral reflectance depends almost entirely on a very thin layer of the materials on the surface. A very small amount (1-2wt%) of carbon black lowers the reflectance and depresses the details of the absorption features. Taking into consideration these results and the brecciation processes by impacts on the asteroid surface, the finer-grained C1 or C2 meteorite seems to be a better candidate for the surface material of Ceres (or Pallas) than a coarse-grained sample of this meteorite.
- 国立極地研究所の論文
著者
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Takano Yukio
Department of Physiology and Pharmacology, Faculty of Pharmaceutical Sciences, Fukuoka University
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Miyamoto Masamichi
Department of Earth and Planetary Science, Graduate School of Science, University of Tokyo
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Takano Yukio
Department Of Pure And Applied Sciences College Of General Education University Of Tokyo
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Mito Akihiro
Department of Pure and Applied Sciences, College of General Education, University of Tokyo
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Fujii Naoyuki
Department of Earth Sciences, Faculty of Science, Kobe University
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Takano Yukio
Department Of Applied Physics Faculty Of Engineering University Of Tokyo
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Mito Akihiro
Department Of Pure And Applied Sciences College Of General Education University Of Tokyo
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Fujii Naoyuki
Department Of Earth Sciences Faculty Of Science Kobe University
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Miyamoto Masamichi
Department Of Pure And Applied Sciences College Of General Education University Of Tokyo
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Miyamoto Masamichi
Department Of Earth And Planetary Science Graduate School Of Science University Of Tokyo
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