Radiative Heating And Temperature Stress at the Surfaces of Near-Earth Objects as Source of Surface Metamorphisms

Details Radiative Heating And Temperature Stress at the Surfaces of Near-Earth Objects as Source of Surface Metamorphisms Radiative Heating And Temperature Stress at the Surfaces of Near-Earth Objects as Source of Surface Metamorphisms

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009dps....41.3202d&link_type=abstract

American Astronomical Society, DPS meeting #41, #32.02

Mathematics

Probability

Scientific paper

The surfaces of near-Earth asteroids (NEAs) are subject to large temperature variations: these are due to changes in the insolation intensity caused by the diurnal cycle, by seasonal effects and by the orbital eccentricity. At 1 AU from the Sun, typical temperatures at the subsolar point are of about 400 K, whereas nighttime temperatures are estimated below 200K.
In addition, about one hundred of the known NEAs have perihelion distances smaller than 0.3 AU, where surface temperatures rise above 800 K, in particular, within craters.
Moreover, the orbits of NEAs are not stable over their dynamical lifetime: we find that a good fraction of NEAs (about 750 bodies) is likely (50% probability) to have experienced low perihelion distances (q<0.3AU) in the past. As a consequence, these bodies are expected to have suffered considerable radiative heating, not trivially correlated to their present orbits.
We discuss how these temperature stresses cause metamorphism of the rocks and alter the mineralogy and other physical properties of the regolith of these bodies. This process is observed in laboratory studies of meteorites that are exposed to rapid temperature cycles of about 200 K.

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