Mineralogy of HED Meteorites Using the Modified Gaussian Model |
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Authors: | Lina Canas René Duffard Teresa Seixas |
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Institution: | (1) Faculdade de Ciências da Universidade do Porto, Porto, Portugal;(2) Instituto Astrofisica de Andalucia, Granada, 18008, Spain |
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Abstract: | The correlation between specific meteorites and asteroids is a long-standing problem. The best-known correlation seems to
be the HED–Vesta, although several problems still remain to be solved. We report the spectral reflectance analysis (0.4–2.5 μm)
of a set of HED meteorites, taken from the RELAB database and three V-type asteroids, taken from MIT-UH-IRTF Joint Campaign
for NEO Reconnaissance. We used the Modified Gaussian Model to fit the spectra to a series of overlapping, modified Gaussian
absorptions. The fitted individual bands are validated against established laboratory calibrations. With spectral resolution
extending to the near-infrared, we are able to resolve the presence of both high-calcium pyroxene (HCP) and low-calcium pyroxene
(LCP) and, thus, use the HCP/(HCP + LCP) ratios to remotely trace igneous processing on the parent asteroids. A search of
this mineral provides a useful probe of differentiation. The high HCP/(HCP + LCP) ratios found require extensive differentiation
of these asteroids and/or their primordial parent body. The degree of melting obtained for the eucrites, using the former
ratio, is comparable with that obtained for all V-type asteroids here analyzed, suggesting a comparable geologic history. |
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Keywords: | Vesta HEDs Meteorites Asteroids Modified Gaussian Model |
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