The current cratering rate on the regular satellites of Jupiter, Saturn, and Uranus

Abstract

We aim to compute the impact rates for objects with a diameter of 1 km onto the regular satellites of Jupiter, Saturn and Uranus using our latest dynamical simulations of the evolution of outer solar system coupled with the best estimates of the current population of objects beyond Neptune and their size-frequency distribution. We use the outcome of the last 3.5~Gyr of evolution of the outer solar system from our database of simulations and combine this with observational constraints of the population beyond Neptune to compute the flux of objects entering the Centaur region, with uncertainties. The initial conditions resemble the current population rather than a near-circular, near-planar disc usually assumed just before the onset of giant planet migration. We obtain a better estimate of the impact probability of a Centaur with the satellites from enacting simulations of planetesimals flying past the satellites on hyperbolic orbits, which agree with literature precedents. We find that our impact rate of objects greater than 1 km in diameter with Jupiter is 0.0012/yr, which is a factor of 3--6 lower than previous estimates of 0.0044/yr from Nesvorny et al. (2023) and 0.0075/yr from Zahnle et al. (2003). On the other hand our impact probabilities with the satellites scaled to the giant planets are consistent with these earlier literature estimates, as is the leakage rate of objects from beyond Neptune into the Centaur region. However, our absolute impact probabilities with the giant planets are lower. We attribute this to our choice of initial conditions.

arXiv commentIn revision with Astronomy and Astrophysics

References in corpus (17)

• Origin of the Structure of the Kuiper Belt during a Dynamical Instability in the Orbits of Uranus and Neptune
• The Absolute Magnitude Distribution of Kuiper Belt Objects
• Oort Cloud and Scattered Disc formation during a late dynamical instability in the Solar System
• The Dynamics of Known Centaurs
• The Evidence for Slow Migration of Neptune from the Inclination Distribution of Kuiper Belt Objects
• Impact Craters on Pluto and Charon Indicate a Deficit of Small Kuiper Belt Objects
• Origin and Evolution of Short-Period Comets
• The Scattered Disk as the source of the Jupiter Family comets
• Jumping Neptune Can Explain the Kuiper Belt Kernel
• The GENGA Code: Gravitational Encounters in N-body simulations with GPU Acceleration
• Thermal Properties of Centaurs Asbolus and Chiron
• A Possible Divot in the Size Distribution of the Kuiper Belt's Scattering Objects
• OSSOS. VIII. The Transition Between Two Size Distribution Slopes in the Scattering Disk
• The color-magnitude distribution of small Jupiter Trojans
• Small Jupiter Trojans Survey with Subaru/Hyper Suprime-Cam
• OSSOS IXX: Testing Early Solar System Dynamical Models using OSSOS Centaur Detections
• Impact bombardment on the regular satellites of Jupiter and Uranus during an episode of giant planet migration

Cited by in corpus (2)

• Excitation and Damping of Oscillation Modes in Gaseous Planets
• Impact chronology of leftover planetesimals