Named in honor of Robert L. Millis, planetary astronomer at Lowell Observatory, whose work on occultations of stars by solar-system objects has led to the discovery of the rings of Uranus and accurate determination of the sizes of a number of minor planets. He has also used the occultation technique to probe the atmospheres of Mars and Uranus, to refine the ephemerides of the Galilean satellites and to search for possible rings around Neptune. (M 7620) _ _.