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The effects of space weathering at UV wavelengths : s-class asteroids

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dc.contributor.author Hendrix, Amanda R.
dc.contributor.author Vilas, Faith
dc.date.accessioned 2007-08-09T20:07:58Z
dc.date.available 2007-08-09T20:07:58Z
dc.date.issued 2006-09
dc.identifier.citation The Astronomical Journal, 132:1396-1404, 2006 September en
dc.identifier.clearanceno 06-0802
dc.identifier.uri http://hdl.handle.net/2014/40360
dc.description.abstract We present evidence that space weathering manifests itself at near-UV wavelengths as a bluing of the spectrum, in contrast with the spectral reddening that has been seen at visible-near-IR wavelengths. Furthermore, the effects of space weathering at UV wavelengths tend to appear with less weathering than do the longer wavelength effects, suggesting that the UV wavelength range is a more sensitive indicator of weathering, and thus age. We report results from analysis of existing near-UV (~220-350 nm) measurements of S-type asteroids from the International Ultraviolet Explorer and the Hubble Space Telescope and comparisons with laboratory measurements of meteorites to support this hypothesis. Composite spectra of S asteroids are produced by combining UV spacecraft data with ground-based longer wavelength data. At visible-near-IR wavelengths, S-type asteroids are generally spectrally redder (and darker) than ordinary chondrite meteorites, whereas the opposite is generally true at near-UV wavelengths. Similarly, laboratory measurements of lunar samples show that lunar soils (presumably more weathered) are spectrally redder at longer wavelengths, and spectrally bluer at near-UV wavelengths, than less weathered crushed lunar rocks. The UV spectral bluing may be a result of the addition of nanophase iron to the regolith through the weathering process. The UV bluing is most prominent in the 300-400 nm range, where the strong UV absorption edge is degraded with weathering. en
dc.description.sponsorship NASA/JPL en
dc.format.extent 843603 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.publisher The Astronomical Journal en
dc.subject minor planets en
dc.subject asteroids en
dc.subject Moon en
dc.subject ultraviolet en
dc.subject solar system en
dc.title The effects of space weathering at UV wavelengths : s-class asteroids en
dc.type Article en


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