Table 6
Impact rates and cratering rates on the giant planets and Enceladus from various dynamical models.
| Model | Classic studies | Recent studies | Our studies | ||||
|---|---|---|---|---|---|---|---|
| Case A | No disruption | With disruption | Averaged | Compact | Extended | ||
| ĊJup | 7.50 | 4.37 | 3.19 | 1.06 | 0.81 | 1.24 | |
| Ċsat | Di ≥ 1 km | 3.15 | 1.41 | 1.31 | 0.43 | 0.34 | 0.48 |
| ĊUra | 1.88 | 1.25 | 1.22 | 0.21 | 0.13 | 0.18 | |
| Ċs | Di ≥ 1 km | 16.5 | 6.56 | 6.12 | 2.13 | 1.56 | 2.52 |
| Dcr ≥ 10 km | 60.8 | 24.1 | 22.5 | 5.00 | 3.59 | 5.82 | |
Notes. The current impact rate on the three giant planets: Jupiter (ĊJup), Saturn (ĊSat), Uranus (ĊUra) per thousand years (kyr−1), and the impact rate on Enceladus (Ċs) per billion years (Gyr−1). The unit for the cratering rate is per billion years per million square kilometre (10−6 km−2 Gyr−1), as derived from dynamical simulations and size-frequency distributions from three groups of studies. The impact rates were derived from the output of the GENGA simulations. The Compact and Extended columns pertain to the compact and extended disc simulations of Wong et al. (2023).
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