Mathematics – Logic
Scientific paper
Mar 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28...13a&link_type=abstract
Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. .13.
Mathematics
Logic
1
Asteroids, Chondrites, Conductive Heat Transfer, Finite Difference Theory, Regolith, Thermal Diffusivity, Approximation, Computerized Simulation, Porosity, Temperature Distribution, Petrology
Scientific paper
We have modeled the thermal history of asteroid 6 Hebe using a finite difference approximation for the radial heat conduction equation. Unlike previous work, our computer code accounts for regolith/megaregolith insulation effects for both 'instantaneous' accretion as well as 'slow' accretion (1-50 m/yr). Thermal conductivity, diffusivity, heat capacity, porosity, and bulk density are all functions of radius and temperature. The heat source used is homogeneously distributed Al-26 and other long-lived nuclides. Impact heating is not considered. The model is constrained primarily by the radius of Hebe, maximum temperatures for H-chondrite petrologic types, and observed cooling rates. The model predicts peak temperatures at the base of a 2.5-km deep regolith to be about 1000 K, equivalent to metamorphic type 5 H-chondrites, whereas, type 6 H-chondrites may sample subregolith regions with peak temperatures of about 1250 K.
Akridge Glen
Benoit Paul H.
Sears Derek W. G.
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