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 (–1987) 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
Commons page Related media on Wikimedia Commons

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.