Motion of nonspherical dust particle under the action of electromagnetic radiation

Equation of motion of realistically shaped particle in the circumstellar dust shell is derived under the action of electromagnetic radiation including the gravity of central body. The effect is considered to the accuracy , where is particle's velocity in a given inertial frame of reference and c is the speed of light. Equation of motion is expressed in terms of particle's optical properties, standardly used in optics for stationary particles.

Application to nonspherical dust particle in the Solar System with initial orbital elements identical to those of comet Encke is presented as an example. It is shown that the motion of nonspherical submicron- and small micron-sized particle may significantly differ from the motion for spherical particle of an identical volume.