Design and stability analysis of frozen orbits around bennu

Bennu, a carbon asteroid, has been widely studied in recent years. Its characteristics, such as geological and dynamic characteristics, have been studied in previous studies. Being potentially hazardous to Earth, exploration missions to Bennu are great interests and necessary. Frozen orbit is commonly used in asteroid exploration because of its stability, long orbit duration time and other specialized advantages for observation. This paper mainly focuses on the design of frozen orbits in the vicinity of Bennu. In this paper, the dynamic model takes asteroid's gravity expressed by higher-order zonal harmonic coefficients and solar radiation pressure into account. A double-averaging technique is used to design the frozen orbits near Bennu. The design method proposed in this paper is practical and can be applied in exploration missions to Bennu in the near future.