APEX APEX is a 12-m sub-mm radio telescope located at 5100 m altitude on Llano Chajnantor, Chile. Observations are carried out from early April to late December (excluding the Bolivian winter). OSO is one of three partners that operate APEX, and its share of the costs is 23%. This is also the Swedish share of the observing time, but, as the host country, Chile gets 10% of the Swedish time. Consequently, OSO distributes 21% of the observing time to the community. The partners have signed a contract to operate APEX at least until the end of 2012
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