ELT site testing - Cerro Macon / Argentina

The ELT programme office has studied half a dozen potential sites for the future ELT observatory. Various aspects need to be considered in the site selection process. Parameters taken into account are not restricted to 'sky quality', but include more general scientific aspects, as well as parameters essential for construction and operations (e.g. accessibility, water and power supply, political stability etc.). The above picture shows the ESO astronomical site monitor on top of Cerro Macon, in Argentina. Cerro Macon was not included in the ELT Site Selection Advisory Committee's final short list for the recommended site.