Comet Rendezvous Asteroid Flyby

The Comet Rendezvous Asteroid Flyby was a mission which was cancelled by NASA because they went over budget,the remaning money was redirected to Cassini–Huygens, which was destined for Saturn.It was planned that a spacecraft would be sent to encounter an asteroid and then it would rendezvous with a comet and fly alongside it for nearly three years.It planned to be the first Mariner Mark II mission.