  In this work, the dynamics of a self-propelled stochastic particle under the
influence of an axisymmetric light field was experimentally studied. The
particle under consideration has the main characteristic of carrying a light
sensor in an eccentric location. For the chosen experimental conditions, the
emerging trajectories were orbital, and, more interestingly, they presented two
preferential radial distances. A mathematical model incorporating the key
experimental components was introduced. By means of numerical simulations and
theoretical analysis, it was found that, in addition to the orbiting behavior,
the sensor location could produce trapped or diffusive behaviors. Furthermore,
the study revealed that stochastic perturbation and the eccentric location of
the sensor are responsible for inducing bistability in the orbital
trajectories, in agreement with the experimental observations.
