Effelsberg Telescope(ef -ĕlz-berg) (Bonn Telescope) One of the world's largest fully steerable radio telescopes, built in 1972 in Bad Münstereifel-Effelsberg 40 km from Bonn, Germany, and operated by the Max Planck Institute for Radioastronomy (MPIR). The dish has a diameter of 100 meters and weighs 3200 tonnes. It was resurfaced in 1986 to an accuracy of 0.5 mm and can be used at frequencies up to 50 GHz. About 30% of the observing time on the telescope is assigned to VLBI observations.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006