Note: SEST was closed in 2003

The 15 m diameter Swedish-ESO Submillimeter Telescope (SEST) was built in 1987 on the European Southern Observatory (ESO) site of La Silla in the Chilean Andes at an altitude of 2300 m. SEST was closed in 2003, but the antenna remains at La Silla.

The SEST project was a cooperation between ESO and Onsala Space Observatory, with contributions also from Finland and Australia.

SEST was equipped with heterodyne receivers for frequency bands in the range 70-365 GHz, and with a 37-channel hexagonal bolometer array, SIMBA, operating at 1.2 mm wavelength. The telescope was used for single-dish observations of a wide range of astronomical objects, especially the Galactic centre and the Magellanic Clouds. It was also used for VLBI observations at millimeter wavelengths.

ESO:s information about SEST