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Space Weathering of S-Complex Asteroids Manifested in the UV/Blue: Recent Insights and Future Directions

Published online by Cambridge University Press:  01 March 2016

Faith Vilas  and
Amanda R. Hendrix
Faith Vilas
Affiliation:
Planetary Science Institute, 1700 E. Fort Lowell Rd., Suite 106, Tucson, AZ 85719USA email: [email protected]
Amanda R. Hendrix
Affiliation:
Planetary Science Institute, 1700 E. Fort Lowell Rd., Suite 106, Tucson, AZ 85719USA email: [email protected]
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Abstract

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Space weathering affects reflectance spectra of the Moon and S-complex asteroids by spectral bluing (increasing reflectance with decreasing wavelength) of their surface materials at UV/blue (less than 400 nm) wavelengths. This spectral bluing is attributed to a degradation of the UV absorption feature seen in spectral reflectance of olivine as a result of the creation of nanophase (npFe0) iron. We have modeled the effect of the addition of small amounts of npFe0 intimately mixed with particles from a hypothetical material and a terrestrial basalt. The addition of 0.0001% npFe0 affects the reflectance at these UV/blue wavelengths, while the addition of 0.01% is required to see the visible/near infrared reddening and diminution of VNIR absorption features. Thus, the UV/blue spectral reflectance characteristics allow earlier detection of the onset of space weathering effects.

Keywords

minor planetsasteroidsplanets and satellites: generalultraviolet: solar system
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Issue S318: Asteroids: New Observations, New Models , August 2015 , pp. 201 - 205
Copyright
Copyright © International Astronomical Union 2016 

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