Swedish-ESO Submillimetre Telescope

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Swedish-ESO Submillimetre Telescope
SEST on fire.jpg
Swedish-ESO Submillimetre Telescope
Part ofLa Silla Observatory Edit this on Wikidata
Location(s)Chile Edit this at Wikidata
Coordinates29°16′S 70°44′W / 29.26°S 70.73°W / -29.26; -70.73Coordinates: 29°16′S 70°44′W / 29.26°S 70.73°W / -29.26; -70.73 Edit this at Wikidata
OrganizationEuropean Southern Observatory
Onsala Space Observatory Edit this on Wikidata
Built–1987 Edit this on Wikidata (–1987 Edit this on Wikidata) Edit this at Wikidata
Telescope styleparabolic reflector
radio telescope Edit this on Wikidata
Diameter15 m (49 ft 3 in) Edit this at Wikidata
Focal length4,875 mm (15 ft 11.9 in) Edit this at Wikidata
Swedish-ESO Submillimetre Telescope is located in Chile
Swedish-ESO Submillimetre Telescope
Location of Swedish-ESO Submillimetre Telescope

The Swedish-ESO Submillimetre Telescope (SEST) was a 15-metre diameter radio telescope located at the La Silla Observatory in Chile. The telescope was built in 1987 as a combined project between ESO and Onsala Space Observatory, with contributions from Finland and Australia.[1] It was then the only large telescope for submillimetre astronomy in the southern hemisphere.[2] It was decommissioned in 2003.[3]

The telescope was used for single-dish observations of a wide range of astronomical objects, especially the Galactic centre and the Magellanic Clouds and for interferometric observations at millimetre wavelengths.[1]

In 1995 observations made with SEST showed that the Boomerang Nebula is the coldest known location in the universe, with a temperature lower than the background radiation.[4][5]


See also[edit]


  1. ^ a b "Swedish-ESO Submillimetre Telescope - SEST". Onsala Space Observatory. Retrieved 2012-07-27.
  2. ^ R. S. Booth; et al. "The Swedish-ESO Submillimetre Telescope" (PDF). ESO. Retrieved 2012-07-27.
  3. ^ "Swedish-ESO 15m Submillimeter Telescope (SEST)". Archived from the original on 2012-07-30. Retrieved 2012-07-27.
  4. ^ Cauchi, Stephen (February 21, 2003). "Coolest bow tie in the universe". The Sydney Morning Herald. Archived from the original on September 1, 2006. Retrieved February 2, 2007.
  5. ^ Sahai, Raghvendra; Nyman, Lars-Åke (1997). "The Boomerang Nebula: The Coolest Region of the Universe?". The Astrophysical Journal. 487 (2): L155–L159. Bibcode:1997ApJ...487L.155S. doi:10.1086/310897.
  6. ^ "Hunting stars". www.eso.org. Retrieved 10 July 2017.
  7. ^ "La Silla Dawn Kisses the Milky Way". Retrieved 23 March 2016.
  8. ^ "Dizzying Star Trails over SEST". www.eso.org. European Southern Observatory. Retrieved 22 September 2014.