Table 2
Parameters used for the fracture-propagation model.
| Source | Unit | Delbo et al. (2022) | This work |
|---|---|---|---|
| Body | Bennu | Ryugu | |
| Density, ρ | kg m−3 | 2236 | 2236 (*) |
| Heat capacity, Cp | J kg−1 K−1 | 1000 | 865 |
| Thermal inertia, Γ | J m−2 K−1 s−0.5 | 370 | 282 |
| Thermal expansion | K−1 | 5 × 10−6 | 2.6 × 10−5 (**) |
| coefficient, α | |||
| Poisson ratio, v | – | 0.2 | 0.2 |
| Rotation period, P | h | 4.296 | 7.636 |
| Young modulus, E | GPa | 10 | 5.3(**) |
| Temperature | K | 70 | 97 |
| difference, ∆T | |||
| Paris law prefactor, C | – | 3 × 10−4 | 3 × 10−4 |
| Paris law exponent, n | – | 3.84 | 3.84 |
Notes.(*) Since the measured density values are not the pure grain density but the bulk density with (micro-) porosity included, the estimated grain density by Delbo et al. (2022) was used. (**)These values were not used in the final model in Figs. 10 and 11, since they made the model produce unreasonable results (see Fig. 9 and Appendix A).
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