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Published online by Cambridge University Press: 03 August 2017
In order to provide a direct connection between the radio reference frame and the fundamental optical system, based on fundamental stars, a radiostar observing programme has been started. Most of the astrolabe stations in the world are participating following the proposal of one of us (Débarbat, 1980), after Commission 24 of the IAU created a Working Group “On the Identification of Optical/Radio Astrometric Sources”.