  Effects of solar wind and solar electromagnetic radiation on motion of
asteroids are discussed. The results complete the statements presented in
Vokrouhlick\'{y} and Milani (2000). As for the effect of electromagnetic
radiation, the complete equation of motion is presented to the first order in
$v/c$ -- the shape of asteroid (spherical body is explicitly presented) and
surface distribution of albedo should be taken into account. Optical quantities
must be calculated in proper frame of reference.
