The enclosure of the Leonhard Euler Telescope with the higher situated New Technology Telescope in the background
|Alternative names||Swiss 1.2-m Leonhard Euler Telescope|
|Named after||Leonhard Euler|
|Part of||La Silla Observatory|
|Location(s)||Norte Chico in Chile|
|First light||12 April 1998|
|Telescope style||reflecting telescope|
|Diameter||1.2 m (3 ft 11 in)|
Location of Swiss 1.2-metre Leonhard Euler Telescope
|Related media on Wikimedia Commons|
Leonhard Euler Telescope, or the Swiss EULER Telescope, is a national, fully automatic 1.2-metre (47 in) reflecting telescope, built and operated by the Geneva Observatory. It is located at an altitude of 2,375 m (7,792 ft) at ESO's La Silla Observatory site in the Chilean Norte Chico region, about 460 kilometers north of Santiago de Chile. The telescope, which saw its first light on 12 April 1998, is named after Swiss mathematician Leonhard Paul Euler.
The Euler telescope uses the CORALIE instrument to search for exoplanets. In addition, the telescope uses the multi-purpose EulerCam (ecam), a high precision photometry instrument, and a smaller, piggyback mounted telescope, called "Pisco". Its first discovery was a planet in orbit around Gliese 86, determined to be a hot Jupiter with an orbital period of only 15.8 earth days and about four times the mass of Jupiter. Since then, many other exoplanets have been discovered or examined in follow-up observations.
Together with the Mercator Telescope, Euler was part of the Southern Sky extrasolar Planet search Programme, which has discovered numerous extrasolar planets. It has also been frequently employed for follow-up characterization to determine the mass of exoplanets discovered by the Wide Angle Search for Planets, SuperWASP.
The CORALIE spectrograph is an echelle type spectrograph used for astronomy and was commissioned at the Euler Telescope in April 1998. The instrument performs doppler spectroscopy, that is it measures the Doppler effect on a star's electromagnetic spectrum caused by the gravitational tug of an exoplanet orbiting around it. The spectrograph participates in the Southern Sky extrasolar Planet search Programme.
Doppler spectroscopy, also known as "radial velocity" or "wobble" method, is an indirect detection method as it only observes the star's spectrum and not the planet itself. It differs from the transit method used by the space-based Kepler mission and ground-based SuperWASP and Next-Generation Transit Survey and can therefore be complementary to their observations. This is because the size of an exoplanet can be estimated using the transit method, while Doppler spectroscopy is used to estimate its mass. By combining the measured size and mass from both methods, it can be determined whether the observed exoplanet is gaseous or rocky.
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.
Five planetary object have been discovered using CORALIE along with several confirmations of discoveries by other programs.
|Gliese 86 b||1998|||
|HD 130322 b||1999|||
The 1.2-meter Leonhard Euler Telescope
Euler Telescope with the ESO 3.6-meter in the background
A fisheye view of the Euler Telescope
Moonlight and Zodiacal Light Over La Silla Observatory
Sunset at ESO's La Silla observatory in Chile
Fantastic Mr Fox
Star cluster NGC 3766
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