The nature of the M-type asteroids from optical polarimetry

Details The nature of the M-type asteroids from optical polarimetry The nature of the M-type asteroids from optical polarimetry

Jan 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979icar...37..124d&link_type=abstract

Icarus, vol. 37, Jan. 1979, p. 124-132.

Computer Science

9

Asteroids, Chemical Composition, Optical Polarization, Polarimetry, Abundance, Fragmentation, Metal Powder, Metal Surfaces, Meteoritic Composition, Polarization, Asteroids, Fragments, Metal, Iron, Polarimetry, Nickel, Meteoroid Impacts, Surface, Optical Properties

Scientific paper

The curves of polarization of the M-type asteroids are not reproduced by silicate rocks in any surface textures, nor do they correspond to metallic fractures. They fit with powders of 20-to 40-micron-diameter fragments of metals. Impacts by meteoriods on metallic bodies are able to produce a superficial coating of small metallic debris because, at the low temperature of asteroids, nickel-iron metals are no longer ductile but brittle. Thus, polarimetric measurements of the M-type asteroids are compatible with metallic bodies probably of iron-nickel composition. Such metallic solar system objects could be the parent bodies for siderites; they may have been formed as the cores of differentiated minor planets subsequently denuded of their silicaceous mantles by accumulation of impacts.

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