Equatorial temperature profiles. a, the fictitious asteroid at r_h = 0.20 au and b, Phaethon at perihelion (r_h = 0.14 au). For the model asteroids, different aspect angles are considered: perpendicular (solid) and 45° (dashed). The different colors of the lines indicate different thermal inertia values: black lines for Γ = 0, light blue lines for fiducial value for model asteroids and Phaethon (Table 1), and red lines for the values considering the temperature-dependent thermal inertia (Γ = 669 tiu and 2622 tiu for model asteroids and Phaethon, respectively; see Sect. 4.2).