Rotational spectral variations of asteroid (8) Flora Implications for the nature of the S-type asteroids and for the parent bodies of the ordinary chondrites

Details Rotational spectral variations of asteroid (8) Flora Implications for the nature of the S-type asteroids and for the parent bodies of the ordinary chondrites Rotational spectral variations of asteroid (8) Flora Implications for the nature of the S-type asteroids and for the parent bodies of the ordinary chondrites

Oct 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984icar...60...83g&link_type=abstract

Icarus (ISSN 0019-1035), vol. 60, Oct. 1984, p. 83-114.

Mathematics

Logic

96

Asteroids, Astronomical Spectroscopy, Chondrites, Planetary Composition, Iron, Mineralogy, Nickel, Olivine, Pyroxenes, Silicates, Spectral Reflectance, Surface Properties, Asteroids, Flora, Rotation, S Asteroids, Parent Bodies, Meteorites, Ordinary Chondrites, Reflectance, Spectra, Metal, Grains, Color, Mineralogy, Petrology, Parameters, Surface, Optical Properties, Analysis, Abundance, Composition, Planetesimals, Core, Fragments

Scientific paper

Two new interpretive calibrations (olivine-pyroxene abundance, spectral signature of chondritic metal grains) have been applied to visible and near-infrared spectral reflectance data for the typical S-type asteroid, (8) Flora. Chondritic metal grains do not exhibit the steeply reddened spectral signature previously associated with a nickel-iron (NiFe) metal phase. The conditions required to produce a S-type spectral curve from a chondritic material are much more restrictive and improbable than previously supposed. Five mineralogic and petrologic parameters have been derived for the surface material of Flora from the analysis of the spectral reflectance and rotational spectral variations of this object. Flora is most probably the residual core of an intensely heated, thermally evolved, and magmatically differentiated planetesimal which was subsequently disrupted.

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