APEX, the Atacama Pathfinder Experiment, is a collaboration between Max Planck Institut für Radioastronomie MPIfR at 50, Onsala Space Observatory OSO at 23, and the European Southern Observatory ESO at 27 to construct and operate a modified ALMA prototype antenna as a single dish on the high altitude site of Llano Chajnantor. The telescope was supplied by VERTEX Antennentechnik in Duisburg, Germany.

Telephone: (56) (55) 448200
Website: http://www.apex-telescope.org/