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Incipient Space Weathering Observed on the Surface of Itokawa Dust Particles

by Konno, M. , Mukai, T. , Ogami, T. , Ishibashi, Y. , Hashimoto, T. , Zolensky, M. E. , Fujimura, A. , Yada, T. , Kimura, M. , Okazaki, R. , Abe, M. , Tanaka, M. , Nakato, A. , Noguchi, T. , Okada, T. , Ueno, M. , Nakamura, T. , Shirai, K.

in Asteroids / Asteroids (minor planets) / Astronomy / Dust / Earth, ocean, space / Exact sciences and technology / Geochemistry / iron / Lunar soil / Meteors & meteorites / Mineralogy / Minerals / Moon / Nanoparticles / Olivine / Plagioclase / Planets, their satellites and rings. Asteroids / Pyroxenes / reflectance spectroscopy / Silicates / Solar system / Solar wind / Space weathering / Spacecraft / Spectral reflectance / Sulfur / texture / Trace elements / vapors / Weathering

2011

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Incipient Space Weathering Observed on the Surface of Itokawa Dust Particles

2011

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Incipient Space Weathering Observed on the Surface of Itokawa Dust Particles

2011

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Journal Article

Incipient Space Weathering Observed on the Surface of Itokawa Dust Particles

Konno, M.,

Mukai, T.,

Ogami, T.,

Ishibashi, Y.,

Hashimoto, T.,

Zolensky, M. E.,

Fujimura, A.,

Yada, T.,

Kimura, M.,

Okazaki, R.,

Abe, M.,

Tanaka, M.,

Nakato, A.,

Noguchi, T.,

Okada, T.,

Ueno, M.,

Nakamura, T.,

Shirai, K.

2011

Overview

The reflectance spectra of the most abundant meteorites, ordinary chondrites, are different from those of the abundant S-type (mnemonic for siliceous) asteroids. This discrepancy has been thought to be due to space weathering, which is an alteration of the surfaces of airless bodies exposed to the space environment. Here we report evidence of space weathering on particles returned from the S-type asteroid 25143 Itokawa by the Hayabusa spacecraft. Surface modification was found in 5 out of 10 particles, which varies depending on mineral species. Sulfur-bearing Fe-rich nanoparticles exist in a thin (5 to 15 nanometers) surface layer on olivine, low-Ca pyroxene, and plagioclase, which is suggestive of vapor deposition. Sulfur-free Fe-rich nanoparticles exist deeper inside (<60 nanometers) ferromagnesian silicates. Their texture suggests formation by metamictization and in situ reduction of Fe2+.

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Publisher

American Association for the Advancement of Science,The American Association for the Advancement of Science

Subject

Asteroids

/ Asteroids (minor planets)

/ Astronomy

/ Dust

/ Earth, ocean, space

/ Exact sciences and technology

/ Geochemistry