Named in memory of Ignace Naudts (1949–1992), active Belgian amateur astronomer, editor of the monthly magazine Heelal of the Flemish association ‘Vereniging voor Sterrenkunde’. His particular fields of interest were planetary satellites and rings, chaos in the solar system, and theoretical and practical study of sundials. He was a talented mathematician, a dynamic and enthusiastic popularizer of astronomy and science. (M 21955) _ _.