Incipient Space Weathering Observed on the Surface of Itokawa Dust Particles

@article{Noguchi2011IncipientSW,
  title={Incipient Space Weathering Observed on the Surface of Itokawa Dust Particles},
  author={Takaaki Noguchi and T. Nakamura and Masashi Kimura and Michael. E. Zolensky and M. Tanaka and Takahito Hashimoto and Mitsuru Konno and Aiko Nakato and Toshihiro Ogami and Akio Fujimura and Masanao Abe and Toru Yada and Toshifumi Mukai and M. Ueno and T. Okada and Kiyoaki Shirai and Yu Ishibashi and Ryuji Okazaki},
  journal={Science},
  year={2011},
  volume={333},
  pages={1121 - 1125}
}
Laboratory analysis of samples returned from an asteroid establishes a direct link between asteroids and meteorites and provides clues to the complex history of the asteroid and its surface. 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… 

Distinctive space weathering on Vesta from regolith mixing processes

The surface of the asteroid Vesta has prominent near-infrared absorption bands characteristic of a range of pyroxenes, confirming a direct link to the basaltic howardite–eucrite–diogenite class of

Iron whiskers on asteroid Itokawa indicate sulfide destruction by space weathering

It is shown that troilite (FeS) grains recovered from the regolith of asteroid 25143 Itokawa have lost sulfur during long-term space exposure, implying that sulfur loss occurs rapidly and, furthermore, that ion irradiation plays an important role in the redistribution of sulfur between solids and gas of the interstellar medium.

Investigating the Role of Sulfides in the Space Weathering of Carbonaceous Chondrites

Introduction: The microstructure, chemistry, and spectral characteristics of regolith grains on the surfaces of airless bodies (e.g., Mercury, the Moon, and asteroids) are altered by solar wind

Irradiation History of Itokawa Regolith Material Deduced from Noble Gases in the Hayabusa Samples

The results suggest that Itokawa is continuously losing its surface materials into space at a rate of tens of centimeters per million years, which should be much shorter than the age of the solar system.

Space weathering signatures in sulfide and silicate minerals from asteroid Itokawa

Transmission electron microscopy analyses of the polymineralic regolith particle RC-MD01-0025 show microstructural and microchemical characteristics indicative of space weathering on the surface of

Q-type asteroids: Possibility of non-fresh weathered surfaces

Itokawa particles, which are samples recovered from the S-complex asteroid 25143 Itokawa by the Hayabusa spacecraft, demonstrate that S-complex asteroids are parent bodies of ordinary chondrite

Space weathering on airless bodies

Volatile-rich bodies and those composed of abundant hydrous minerals (dwarf planet Ceres, many dark asteroids, outer solar system satellites) are affected by space weathering processes differently than the silicate bodies of the inner solar system.

Space environment of an asteroid preserved on micrograins returned by the Hayabusa spacecraft

Impact appears to be an important process shaping the exteriors of not only large planetary bodies, such as the moon, but also low-gravity bodies such as asteroids, demonstrating the central role played by impact processes in the long-term evolution of planetary bodies.

Microchemical and structural evidence for space weathering in soils from asteroid Itokawa

Here we report microchemical and microstructural features indicative of space weathering in a particle returned from the surface of asteroid Itokawa by the Hayabusa mission. Space weathering features
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References

SHOWING 1-10 OF 32 REFERENCES

Itokawa Dust Particles: A Direct Link Between S-Type Asteroids and Ordinary Chondrites

Laboratory analysis of samples returned from an asteroid establishes a direct link between asteroids and meteorites and provides clues to the complex history of the asteroid and its surface. The

Developing space weathering on the asteroid 25143 Itokawa

It is reported that a dark region on a small asteroid—25143 Itokawa—is significantly more space-weathered than a nearby bright region, andSpectra of both regions are consistent with those of LL5-6 chondrites after continuum removal, concluding that there must be many asteroids with ordinary-chondrite compositions in near-Earth orbits.

Irradiation History of Itokawa Regolith Material Deduced from Noble Gases in the Hayabusa Samples

The results suggest that Itokawa is continuously losing its surface materials into space at a rate of tens of centimeters per million years, which should be much shorter than the age of the solar system.

SPACE WEATHERING OF ASTEROID SURFACES

▪ Abstract Visible and near-infrared spectra of reflected sunlight from asteroid surfaces exhibit features that hold the promise for identifying surface mineralogy. However, the very surfaces that

Space weathering from Mercury to the asteroid belt

The variety of evidence bearing on the nature of space weathering is reviewed. The effects of space weathering include spectral darkening, reddening and subdued absorption bands, and the distinctive

Space weathering on airless bodies: Resolving a mystery with lunar samples

Abstract— Using new techniques to examine the products of space weathering of lunar soils, we demonstrate that nanophase reduced iron (npFe0) is produced on the surface of grains by a combination of

Production of iron nanoparticles by laser irradiation in a simulation of lunar-like space weathering

Observations by transmission electron microscopy of olivine samples subjected to pulse laser irradiation find nanophase iron particles similar to those observed in the rims of space-weathered lunar regolith grains, and support the idea that ordinary chondrites came from S-type asteroids, and thereby provides some constraints on the surface exposure ages of those asteroids.

Evidence of Space Weathering in Regolith Breccias II: Asteroidal Regolith Breccias

Abstract– Space weathering products, such as agglutinates and nanophase iron‐bearing rims are easily preserved through lithification in lunar regolith breccias, thus such products, if produced,

Solar wind as the origin of rapid reddening of asteroid surfaces

The rapid colour change found implies that colour trends seen among asteroids are most probably due to compositional or surface-particle-size properties, rather than to different relative ages, as well as demonstrating the necessity to take account of composition when evaluating weathering effectiveness.