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An 800 Myr-old Impact Shower on the Terrestrial Planets from the Breakup of the Eulalia Parent Body

  • Authors: William F. Bottke, David Vokrouhlický, Melissa Dykhuis, Nicolle Zellner

William F. Bottke et al 2026 The Planetary Science Journal 7 .

  • Provider: AAS Journals

Caption: Figure 8.

Modeling the dynamical evolution of the canonical Eulalia family with the center ac = 2.475 au. This solution used the bulk density ρ = 1.3 g cm−3, the surface thermal inertia Γ = 230 SI units, and the variable YORP timescale τ0 = 1 My. The best match to the data (left panel) is obtained for T = 855 My and v5 = 14 m s−1 (recall that the characteristic initial ejection velocity is vej(D) = v5 (5 km/D) in meters per second). This solution provides fewer fragments directly injected into the J3:1. Most of the flux into the resonance is due to post-formation transport of fragments by the Yarkovsky effect (right panel). The total number of transported D ≃ 2–3 km fragments to J3:1 is about 75% of that provided by the solution shown in Figure 7. Both ordinates are calibrated to the adopted family identification without correcting for its incompleteness.

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