Named in honor of Atsushi Miyamoto (b. 1961), senior researcher at Saji Observatory and a board member of the Tottori Society of Astronomy. In June 1997 he initiated one of Saji Observatory's first research projects, using its 1.03-m telescope to make follow-up observations of the faint transneptunian objects. This resulted in the first such observation in Japan, when 1997 CS29 was detected on 1997 Dec. 25. Name proposed by the discoverers following a suggestion by Y. Yamada.