We examine the effect of a rapidly migrating protoplanet on a ring of planetesimals .
The eccentricities of the planetesimals are usually increased by \Delta e \in ( 0.01 , 0.1 ) , with the exact increase being proportional to the protoplanet ’ s mass , and inversely proportional to its migration rate .
The eccentricity distribution is also substantially changed from a Rayleigh distribution .
We discuss the possible implications for further planet formation , and suggest that the rapid passage of a protoplanet may not prevent the planetesimal disc from forming further planets .