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Asteroids: surface composition from reflection spectroscopy.

T B McCord, M J Gaffey

    Science (New York, N.Y.)
    |October 25, 1974
    PubMed
    Summary
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    Asteroid surface minerals were identified using spectral analysis, revealing diverse compositions like carbonaceous chondrites and silicate-metal mixes. This study links asteroid types to specific meteorite classes, supporting the asteroid belt as a meteoritic material source.

    Area of Science:

    • Planetary Science
    • Mineralogy
    • Spectroscopy

    Background:

    • Asteroid surfaces hold clues to their composition and origin.
    • Meteorites provide physical samples of extraterrestrial material.
    • Understanding asteroid-meteorite connections is key to solar system formation studies.

    Purpose of the Study:

    • To determine the mineral composition of 14 asteroids.
    • To investigate the relationship between asteroid surface materials and meteorite classes.
    • To assess the asteroid belt as a source of meteoritic material.

    Main Methods:

    • Analysis of asteroid reflectance spectra.
    • Utilizing optical properties of meteorites and laboratory materials.
    • Interpreting electronic absorption features through laboratory and theoretical studies.

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    Main Results:

    • Identified six carbonaceous chondrite-like, two stony-iron-like, one iron meteorite-like, and one basaltic achondrite-like surface compositions.
    • Discovered four silicate-metal assemblages with a metal/silicate ratio of approximately 0.25.
    • Confirmed the presence of diverse mineral types on asteroid surfaces.

    Conclusions:

    • The asteroid belt is a significant source of meteoritic material.
    • Specific asteroid types are demonstrably linked to certain meteorite classes.
    • Spectral analysis is a powerful tool for remote mineralogical assessment of asteroids.