Named in honor of Donald B. Campbell, planetary scientist at Cornell University, on the occasion of his 50th birthday. Campbell is responsible for the development of the Arecibo Observatory’s high-power radar system and the considerable success of the Arecibo radar astronomy program during the past quarter century. He has carried out radar observations of every class of solar system target during this period. He is the discoverer of a large number of Venus surface features whose geologic character is now being clarified by the Magellan radar. Campbell’s contributions to small-body astronomy include the first radar ranging to an asteroid ((433) Eros in 1975) and observations that revealed the existence of large-particle clouds around comets. (M 20159) _ _.