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Swedish-ESO Submillimetre Telescope (SEST)

By now not a user facility any more, the SEST was for many years the most powerful millimetre wavelength single dish telescope in the southern hemisphere. It was located at the European Southern Observatory's (ESO's) La Silla Observatory in the Chilean Andes, ca. 500 km north of Santiago de Chile, and operated jointly by Onsala Space Observatory (OSO) and ESO. Its diameter was 15 m, which is the same as that of the telescopes used in IRAM's Plateau de Bure interferometer.

Like all millimetre observatories, the SEST was built to observe molecular gas in both our galaxy and extragalactic objects, as well as radio continuum emission of cold dust.

For more nighttime photos of the SEST, see the page of astronomical photos.