Densidad de partículas en el entorno del asteroide (65803) Didymos debido a su rápida rotación

The near-Earth binary asteroid (65803) Didymos orbits the Sun with a semi-major axis of 1.64 au and is the target of future DART (NASA) and Hera (ESA) space missions. The system is composed of a primary asteroid, Didymos, 780 m in diameter and a satellite, Dimorphos, 160 m in diameter. The primary has a short rotation period (2.26 h) and a low estimated density (2,170 kg m^-3), which leads to propose that it is an object formed by gravitational aggregates and whose shape has a bulge at the poles and at the equator (top-shape asteroids). In the equatorial region of these asteroids, the centripetal acceleration can be large enough to overcome the local gravity and allow regolith to be ejected from the surface. In this work we study under which conditions this process is possible in Didymos, the dynamics of the ejected particles and compute the orbit mass density around the system. The analysis is performed by a numerical code that integrates the equation of motion of the particles in a rotating, non-inertial reference frame centered on the primary asteroid. A polyhedral shape model for Didymos, composed of 1996 faces and 1000 vertices, is considered.