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Missions to near-Earth asteroids are of interest to both scientists and prospectors in search of extraterrestrial materials. The primary consideration in selecting the object to explore is accessibility. The measure of accessibility is taken to be the global minimum total AF for a two-impulse transfer or less than 360 deg from standard shuttle orbit to rendezvous with the asteroid. A ranking by accessibility of all known near-Earth asteroids is presented. In addition, actual mission opportunities with launch dates between 1990 and 2010 for the most accessible are listed and compared with the optimal rendezvous. Actual sample return opportunities are investigated for the very best candidates.

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