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Volume 60 Supplement 4

Special Issue: Lunar Science with the SELENE “Kaguya” Mission-Prelaunch Studies-

An improved scheme for modeling the reflectance spectra of space-weathered regoliths


In the remote detection of mineral compositions of planetary surface materials on airless bodies, space weathering is an obstacle which makes reflectance spectra redder and darker and weakens spectral features. This study attempts to model an effect of space weathering due to vapor coating by accounting for the change in surface reflectivity of regolith particles wherein nanophase-reduced iron (npFe0) particles are concentrated on their surfaces. When applied to a suite of reflectance spectra of lunar soils having different degrees of space weathering, this model can estimate the degrees of space weathering in terms of the thicknesses of the coating layer and provide an absorption coefficient spectrum of the host material.


  • Fischer, E. M., Quantitative compositional analysis of the lunar surface from reflectance spectroscopy: Iron, aluminum, and a model for removing the optical effects of space weathering, Ph.D. Thesis, 1995.

    Google Scholar 

  • Fischer, E. M. and C. M. Pieters, Remote determination of exposure degree and iron concentration of lunar soils using Vis-NIR spectroscopic methods, Icarus, 111, 475–488, 1994.

    Article  Google Scholar 

  • Hapke, B., Bidirectional reflectance spectroscopy 1: Theory, J. Geophys. Res., 86, 3039–3054, 1981.

    Article  Google Scholar 

  • Hapke, B., Theory of Reflectance and Emittance Spectroscopy, Cambridge Univ. Press, New York, 1993.

    Book  Google Scholar 

  • Hapke, B., Space weathering from Mercury to the asteroid belt, J. Geophys. Res., 106, 10039–10073, 2001.

    Article  Google Scholar 

  • Hiroi, T. and C. M. Pieters, Estimation of grain sizes and mixing ratios of fine powder mixtures of common geologic minerals, J. Geophys. Res., 99, 10867–10879, 1994.

    Article  Google Scholar 

  • Johnson, P. B. and R.W. Christy, Optical constants of transition metals: Ti, V, Cr, Mn, Fe, Co, Ni, and Pd, Phys. Rev. B, 9, 5056–5070, 1974.

    Article  Google Scholar 

  • Keller, L. P. and D. S. McKay, Discovery of vapor deposits in the lunar regolith, Science, 261, 1305–1307, 1993.

    Article  Google Scholar 

  • Keller, L. P. and D. S. McKay, The nature and origin of rims on lunar soil grains, Geochim. Cosmochim. Acta, 61, 2331–2341, 1997.

    Article  Google Scholar 

  • McKay, D. S., G. H. Heiken, A. Basu, G. Blanford, S. Simon, R. Reedy, B. M. French, and J. Papike, The lunar regolith, in The lunar sourcebook, edited by G. H. Heiken, D. T. Vaniman, and B. M. French, pp. 285–356, Cambridge University Press, New York, 1991.

    Google Scholar 

  • Morris, R. V., Origin and evolution of the grain-size dependence of the concentration of fine-grained metal in lunar soils: The maturation of lunar soils to a steady-state stage, Lunar Planet Sci, 8, 3719–3747, 1977.

    Google Scholar 

  • Noble, S. K., C. M. Pieters, and L. P. Keller, Can space weathering survive lithification? Results of a TEM study of lunar regolith breccia 10068, Lunar Planet. Sci., 33, no. 1334, 2002.

    Google Scholar 

  • Pieters, C. M., E. M. Fischer, O. Rode, and A. Basu, Optical effects of space weathering: The role of the finest fraction, J. Geophys. Res., 98, 20817–20824, 1993.

    Article  Google Scholar 

  • Sasaki, S., K. Nakamura, Y. Hamabe, E. Kurahashi, and T. Hiroi, Production of iron nanoparticles by laser irradiation in a simulation of lunarlike space weathering, Nature, 410, 555–557, 2001.

    Article  Google Scholar 

  • Sunshine, J. M., C. M. Pieters, and S. F. Pratt, Deconvolution of mineral absorption bands: An improved approach, J. Geophys. Res., 95, 6955–6966, 1990.

    Article  Google Scholar 

  • Wentworth, S. J., L. P. Keller, D. S. McKay, and R. V. Morris, Space weathering on the moon: Patina on Apollo 17 samples 75075 and 76015, Meteorit. Planet. Sci., 34, 593–603, 1999.

    Article  Google Scholar 

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Correspondence to Tokuhiro Nimura.

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Nimura, T., Hiroi, T. & Pieters, C.M. An improved scheme for modeling the reflectance spectra of space-weathered regoliths. Earth Planet Sp 60, 271–275 (2008).

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Key words

  • Space weathering
  • airless bodies
  • vapor coating
  • surface reflectivity
  • regolith particles
  • modeling