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Active asteroid (6478) Gault sheds mass independent of location along itsorbit. Rotational instability is considered to induce the observed activities.If this is the case, because Gaults breakup event has not been detected,surface failure is likely, implying its surface materials are constantlyejected while its major body remains intact. Given this scenario, we firstconstrain Gaults bulk cohesive strength. We then characterize heliocentrictrajectories of ejected particles over thousands of years. The results showthat Gault may be sensitive to structural failure at the current spin period (~2.5 hr). Gaults bulk density needs to be below 1.75 g/cm^3 in order forparticles on the equatorial surface to be shed due to centrifugal forces. Inthis case, Gault requires cohesive strength of at least ~ 200 Pa to maintainthe structure at the center, whereas the surface strength needs to be less than~ 100 Pa to induce mass shedding. This suggests that Gaults structure mayconsist of a weak surface layer atop a strong core. The trajectories of dustejected from Gault depend on how efficiently they are accelerated by solarradiation pressure. Escaped particle clouds with sizes on the order of 100micrometers could collide with Gault after about 700 to 5300 years with speedsof ~ 0.2 km/sec. This implies a temporal increase in the impact flux andcomplex interactions between the ejected particles and their host body.

Active Main-Belt Asteroid (6478) Gault -- Constraint on Its Cohesive Strength and the Fate of Ejected Particles in the Solar System