...change

Figures 1 and 3 in Vokrouhlický & Milani (2000) describe in qualitative way the reason why sunlight reflection of a body with asymmetric albedo produces a secular change of the orbital semimajor axis.

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...power

As a by-product of our work we also determine that there are no linear ${\propto} e^1$ terms in the secular semimajor axis drift due to the Yarkovsky forces when the surface albedo is constant. A more extended work for the seasonal variant of the Yarkovsky effect is in the Appendix of Vokrouhlický & Farinella (1999).

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