Asteroid families are groups of asteroids believed to be fragments of a common parent body, whose in-situ observation provides direct information about the inner structure of their parent body once existed in the early stage of the Solar System evolution. This paper reports preliminary results of the mission design for exploration of such an asteroid family. The spacecraft makes multiple flybys with Koronis asteroids during one revolution around the Sun and returns to the Earth for sample return. A sample collecting mechanism is installed on the spacecraft which releases a projectile just before the asteroid flyby and collecting the asteroid regolith at the moment of the closest approach. The original version of this paper is presented at the International Symposium on Spaceflight Dynamics, June 26-30, 2000, Biarritz, France.
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