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Search for habitable Planets EClipsing ULtra-cOOl Stars
Alternative namesSPECULOOS Edit this on Wikidata
Location(s)Chile Edit this at Wikidata
Coordinates24°36′56″S 70°23′25″W / 24.6156°S 70.3904°W / -24.6156; -70.3904Coordinates: 24°36′56″S 70°23′25″W / 24.6156°S 70.3904°W / -24.6156; -70.3904 Edit this at Wikidata
OrganizationEuropean Southern Observatory
University of Liège Edit this on Wikidata
Telescope styleAstronomical survey
Optical telescope
Ritchey–Chrétien telescope Edit this on Wikidata
Number of telescopesEdit this on Wikidata
Diameter1 m (3 ft 3 in) Edit this at Wikidata
SPECULOOS is located in Chile
Location of SPECULOOS

SPECULOOS (Search for habitable Planets EClipsing ULtra-cOOl Stars) is a project in development that will consist of four Ritchey–Chrétien telescopes of 1-metre primary aperture, made by ASTELCO. Each telescope will be equipped with a NTM-1000 robotic mount, that will be installed at the Paranal Observatory in Chile to search for Earth-sized exoplanets around 1000 ultra-cool stars and brown dwarfs.[1][2][3][4][5]

The system comprises four telescopes called Europa, Io, Callisto, and Ganymede. The first telescope (Europa) saw its first light in April 2017.[6] The second telescope (Io) began operations in October 2017.[7] The robotic observations of each of the four telescopes will be controlled by the program ACP Expert. There is a sister project in the northern hemisphere.[8][9]


The four 1m-diameter telescopes will be equipped with cameras sensitive in the near-infrared, the wavelength range in which ultra-cool stars and brown dwarfs emit most of their light.


SPECULOOS involves scientists from the University of Liège (Belgium), the Cavendish Laboratory, Cambridge (UK) and the King Abdulaziz University (Saudi Arabia), under the leadership of Michaël Gillon of the University of Liège. The European Southern Observatory (ESO) supports and hosts SPECULOOS at the Paranal Observatory.

See also[edit]

  • TRAPPIST another project of the University of Liège to search for exoplanets.


  1. ^ "Université de Liège - Life elsewhere in the Universe? A new nearby planetary system could bring soon the answer". Ulg.ac.be. 2016-07-20. Retrieved 2016-08-01.
  2. ^ "Speculoos". Orca.ulg.ac.be. Retrieved 2016-08-01.
  3. ^ "Astronomers revisit dwarf stars' promise : Nature News & Comment". Nature.com. 2013-10-29. Retrieved 2016-08-01.
  4. ^ "SPECULOOS, a search for terrestrial planets transiting the nearest ultra-cool stars (Speaker: Michael Gillon)". Space.mit.edu. Retrieved 2016-08-01.
  5. ^ "Research". SPECULOOS. Retrieved 23 February 2017.
  6. ^ Europa First light!. SPECULOOS. 20/04/2017
  7. ^ Io, Europa’s young brother is installed. SPECULOOS. 04/10/2017
  8. ^ https://www.eso.org/public/chile/teles-instr/paranal-observatory/speculoos/
  9. ^ L'Observatoire SPECULOOS North (French)