Fig. 8

Estimated mean drift rate da/dt in semimajor axis due to the Yarkovsky effect for 495 Eulalia as a function of the surface thermal conductivity K. We assumed D = 40 km size, P = 29 h rotation period, 1.3 g/cm3 bulk density, 1.7 g/cm3 surface density and 800 J/kg/K. Since the diurnal variant of the Yarkovsky effect dominates, da/dt ∝ cosε, where ε is the obliquity of the spin axis. The upper black curve corresponds to a maximum drift-rate at ε = 0°, the gray curves are for ε = 30° and ε = 60°. Main-belt asteroids of Eulalia size and spectral type are expected to have K in between 0.001 and 0.01 W/m/K. Shorter rotation period would make the curves shifted according to the arrows (examples for 10 and 20 h).
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