Table 1
Different models of bedrock physical parameters and characteristic values of Kamo‘oalewa used to calculate thermal stress fields.
| Parameters | Unit | Model 1 | Model 2 | Model 3 | Model 4 |
|---|---|---|---|---|---|
| Obliquity, γ | degree | 99.3 | 45 | 99.3 | 45 |
| Material | – | Norite | Norite | Ordinary chondrite | Ordinary chondrite |
| Density, ρ | kg m−3 | 2990 | 2990 | 3150 | 3150 |
| Thermal conductivity, κ | W m−1 K−1 | 2.688 | 2.688 | 1.88 | 1.88 |
| Heat capacity, c | J kg−1 K−1 | 670 | 670 | 550 | 550 |
| Thermal inertia, Γ | J m−2 K−1 s−1/2 | 2321 | 2321 | 1804 | 1804 |
| Diurnal skin depth, ls,rock | cm | 1.9 | 1.9 | 1.7 | 1.7 |
| Bulk modulus, K | GPa | 72.4 | 72.4 | 56 | 56 |
| Shear modulus, µ | GPa | 32.1 | 32.1 | 29 | 29 |
| Coefficient of thermal expansion, α | K−1 | 7.05 × 10−6 | 7.05 × 10−6 | 8.5 × 10−6 | 8.5 × 10−6 |
| F0,α | (MPa)3.84 s−1 | 0.095 | 0.0073 | 0.18 | 0.016 |
| F0,β | (MPa)3.84 s−1 | 1.45 | 0.97 | 2.37 | 1.61 |
| F0,D | (MPa)3.84 s−1 | 2.3 × 10−3 | 2.6 × 10−3 | 4.6 × 10−3 | 6.2 × 10−3 |
Notes. Values of norite and ordinary chondrite material properties were adopted from the models in Ren et al. (2024b) and Delbo et al. (2014), respectively. Characteristic values F0,α, F0,β, and F0,D are intermediate factors that serve the regolith production rate calculations, and their definitions are given in Sects. 3.3 and 4.
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