Geometric parameters of our model: the orbital plane of meteoroid’s heliocentric motion defines the xy plane of our reference system with x-axis oriented toward the perihelion Π. Instantaneous position of the body along its orbit is given by the true anomaly v. The orientation of the spin axis e_ω is specified by longitude λ and latitude β; the solar colatitude in the body-frame, with the z′-axis along e_ω, is denoted θ₀.