Modeling of S-Type Asteroid Spectra Using Primitive Achondrites and Iron Meteorites

Takahiro Hiroi, Jeffrey F. Bell, Hiroshi Takeda, Carlé M. Pieters

Research output: Contribution to journalArticlepeer-review

45 Scopus citations


The stony iron model for the S asteroids has been tested using observed reflectance spectra of the S asteroids and modeled spectra of meteoritic components. Observed reflectance spectra of 40 S asteroids were fit with linear combinations of laboratory reflectance spectra of 6 representative primitive achondrites and an iron meteorite. Specular and diffuse reflection components were taken into account for metallic-iron reflectance. Even with this limited set of meteorite spectra, 16 of those 40 S asteroids were fit fairly well in terms of absorption-band features and spectral profiles. The number of well-fit S asteroids may be greater if the number and variety of metallic and stony domains are expanded. This initial result suggests that many of the S-asteroidal surfaces may be various kinds of regional mixtures of primitive achondrites and metallic iron. If true, the S asteroids could have been originally formed of chondrite-like source materials because mineral assemblages of primitive achondrites seem to have recrystallized from chondrites by segregation of metallic components and loss of partial melts.

Original languageEnglish (US)
Pages (from-to)107-116
Number of pages10
Issue number1
StatePublished - 1993
Externally publishedYes

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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