Comparison between our formulation of the mean temperature T_av (degree 8 truncated series; dashed lines) and the mean value of the first (left panels) and fourth power (right panels) of the numerically determined temperature T(θ, ϕ; ℓ) defined by (49) (solid lines). The spherical body on a Didymos heliocentric orbit assumed and the four values of the thermal parameter used are Θ = 0 (black), Θ = 0.033 (blue), Θ = 0.07 (green), and Θ = 0.175 (red).