Leonhard Euler Telescope

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The enclosure of the Leonhard Euler Telescope

Leonhard Euler Telescope, or Swiss 1.2-m Leonhard Euler Telescope, is a national 1.2-metre (3.9 ft) diameter aperture reflecting telescope of the Geneva Observatory at ESO's La Silla Observatory site in Chile.

The telescope uses the CORALIE instrument to search for exoplanets.[1] Its first discovery was a planet in orbit around Gliese 86.[1] It was determined to be a 4MJ planet with an orbital period of 15.8 earth days.[2] Since then, many other extra solar-system planets have been discovered or examined.[3]

The observatory is operated by the University of Geneva of Switzerland since the telescopes was finished in 1998.[4] and was named after the Swiss mathematician Leonhard Paul Euler (1707–1783).[5]

The Euler 1.2 and the Mercator Telescope were part of the Southern Sky extrasolar Planet search Programme which has discovered numerous extrasolar planets.[6]


The CORALIE spectrograph is an echelle type spectrograph used for astronomy and was commissioned at the Leonhard Euler Telescope in April 1998. The instrument measures the Doppler effect of a star's electromagnetic spectrum caused by the presence of extrasolar planets. This indirect technique is known as the radial velocity method or wobble method and differs from other detection methods, such as the transit method used by the Kepler mission.[7][8] The spectrograph participates in the Southern Sky extrasolar Planet search Programme.


The resolution of CORALIE is fixed at R = 50,000 with a 3 pixel sampling. The detector CCD is 2k X 2k with a 15 micrometer pixel size.

Discovered exoplanets[edit]

Five planetary object have been discovered using CORALIE along with several confirmations of discoveries by other programs.

Planet Date announced
Gliese 86 b 24 November 1998[7]
HD 75289b 1999[9]
HD 130322 b 1999[9]
HD 192263b 1999[10][11]
GJ 3021b 2000[12]



Timelapse video of Euler and the NTT observing the night sky

See also[edit]


  1. ^ a b http://www.daviddarling.info/encyclopedia/L/Leonard_Euler_Telescope.html
  2. ^ Queloz, D.; Mayor, M.; Weber, L.; Blecha, A.; Burnet, M.; Confino, B.; Naef, D.; Pepe, F.; Santos, N. (1999). "A planet orbiting the star Gliese 86". arXiv:astro-ph/9910223 [astro-ph]. 
  3. ^ http://astro.berkeley.edu/~gmarcy/hd83443/pressrelease.html
  4. ^ http://www.ster.kuleuven.be/~katrienu/comparison.html
  5. ^ http://www.eso.org/gallery/v/ESOPIA/LaSilla/phot-13c-00-hires.jpg.html
  6. ^ http://obswww.unige.ch/~udry/planet/coralie.html
  7. ^ a b Queloz; Mayor, M.; Weber, L.; Blécha, A.; Burnet, M.; Confino, B.; Naef, D.; Pepe, F.; Santos, N. et al. (2000). "The CORALIE survey for southern extra-solar planets. I. A planet orbiting the star Gliese 86". Astronomy and Astrophysics 354: 99–102. Bibcode:2000A&A...354...99Q. 
  8. ^ ESO publication, D. Queloz and M. Mayor, From CORALIE to HARPS, September 2001
  9. ^ a b Udry; Mayor, M.; Naef, D.; Pepe, F.; Queloz, D.; Santos, N. C.; Burnet, M.; Confino, B.; Melo, C. (2000). "The CORALIE survey for southern extra-solar planets II. The short-period planetary companions to HD 75289 and HD 130322". Astronomy and Astrophysics 356: 590–598. Bibcode:2000A&A...356..590U. 
  10. ^ Santos; Udry, S.; Mayor, M.; Naef, D.; Pepe, F.; Queloz, D.; Burki, G.; Cramer, N.; Nicolet, B. (2003). "The CORALIE survey for southern extra-solar planets XI. The return of the giant planet orbiting HD192263". Astronomy and Astrophysics 406 (1): 373–381. arXiv:astro-ph/0305434. Bibcode:2003A&A...406..373S. doi:10.1051/0004-6361:20030776. 
  11. ^ Santos; Mayor, M.; Naef, D.; Pepe, F.; Queloz, D.; Udry, S.; Burnet, M.; Revaz, Y. (2000). "The CORALIE survey for southern extra-solar planets III. A giant planet in orbit around HD 192263". Astronomy and Astrophysics 356: 599–602. Bibcode:2000A&A...356..599S. 
  12. ^ Naef; Mayor, M.; Pepe, F.; Queloz, D.; Santos, N. C.; Udry, S.; Burnet, M. (2001). "The CORALIE survey for southern extrasolar planets V: 3 new extrasolar planets". Astronomy and Astrophysics 375 (1): 205–218. arXiv:astro-ph/0106255. Bibcode:2001A&A...375..205N. doi:10.1051/0004-6361:20010841. 
  13. ^ http://obswww.unige.ch/~udry/planet/elodie.html Northern Extrasolar Planet Search

External links[edit]

Coordinates: 29°15′34″S 70°43′59″W / 29.25956°S 70.73297°W / -29.25956; -70.73297