Computed secular change of the orbital semimajor axis (da/ dt)mod due to the Yarkovsky effect vs. surface thermal inertia Γ for (1685) Toro. Nominal values of the rotation state and size are used. The gray vertical zone indicates the plausible range of Γ. The horizontal gray area is the Yarkovsky da/ dt secular value from the orbit determination (1σ interval). The Yarkovsky effect has been clearly detected in spite Toro’s large size due to radar astrometric observations in four apparitions. The theoretical curves for bulk densities 2 and 2.5 g cm-3 closely match the overlap of the observed da/ dt and Γ values.
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