Named in honor of Kevin J. Zahnle (b. 1955), senior research scientist at NASA Ames Research Center, for many fundamental contributions to understanding the physical nature and size-frequency distributions of minor planets and comets and the implications of their impacts with planets. Zahnle's research has elucidated the physics of atmospheric entry and thus identified the Tunguska object as a stony object, provided critical predictions of the phenomena observed in the 1994 cometary impacts with Jupiter and quantified the expected environmental effects from earth impacts of NEOs over a wide energy range, leading to a determination of the threshold energy for global impact catastrophe. Name suggested and citation provided by D. Morrison.