Named in memory of Frantisek Nušl (1867–1951), Czech astronomer and mathematician, director of the National Observatory in Prague and for many years the chairman of the Czech Astronomical Society. His main interest consisted in the construction of astronomical instruments for the determination of geographical coordinates (circumzenithal, diazenithal, radiozenithal, etc.) in collaboration with J. J. Frič. (M 22498) _ _.