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Fig. 6 | Progress in Earth and Planetary Science

Fig. 6

From: Asteroid Ryugu before the Hayabusa2 encounter

Fig. 6

Contour plot of thermal inertia (in units of J m−2 s−1/2 K−1) as a function of particle diameter and porosity. The gray-filled region indicates the thermal inertia range estimated for Ryugu by ground-based observations (Müller et al. 2017). The regolith parameters assumed in the calculation are cp = 758 J kg−1 K−1, T = 300 K, ρm = 3110 kg m−3, km = 0.0021 T + 1.19 W m−1 K−1, γ = 0.032 J m−2, ν = 0.25, E = 78 GPa, ϵ = 1.0, ξ = 0.12, z = 0.01 m, and g = 1.8 × 10–4 m s−2, respectively. γ and ξ were optimized for experimental data of lunar regolith simulant JSC-1A (Sakatani et al. 2018)

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