Named in honor of P. Kenneth Seidelmann {1937– }, director of the Nautical Almanac Office of the U.S. Naval Observatory, currently vice president of IAU Commission 4, and a past chairman and secretary of the Division on Dynamical Astronomy of the American Astronomical Society. Seidelmann has played an important role in the introduction of new constants, theories, timescales and reference frames into the astronomical ephemerides, particularly a new theory of nutation. He has also explored the use of new techniques for obtaining astrometric data on minor planets and satellites. (M 11161) _ _.