He is credited by the Minor Planet Center with the discovery of 55 numbered minor planets during 1964–1989,[1] including the Apollo asteroids 4544 Xanthus[3] and 4581 Asclepius, as well as the Amor asteroid 3352 McAuliffe.
Den Thomas hat 55 Asteroiden entdeckt, ënner hinnen d'Apollo-Asteroiden (4544) Xanthus an (4581) Asclepius souwéi den Amor-Asteroid (3352) McAuliffe.