 The enclosure of the Leonhard Euler Telescope with the higher situatedNew Technology Telescope in the background | |
| Alternative names | Swiss 1.2-m Leonhard Euler Telescope |
|---|---|
| Location(s) | Norte Chico |
| Coordinates | 29°15′34″S70°43′59″W / 29.2594°S 70.7331°W /-29.2594; -70.7331 |
| Diameter | 1.2 m (3 ft 11 in) |
  Location of Swiss 1.2-metre Leonhard Euler Telescope | |
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Leonhard Euler Telescope, or the Swiss EULER Telescope, is a national, fully automatic 1.2-metre (47 in)reflecting telescope, built and operated by theGeneva Observatory. It is located at an altitude of 2,375 m (7,792 ft) atESO'sLa Silla Observatory site in the ChileanNorte Chico region, about 460 kilometers north ofSantiago de Chile. The telescope, which saw its first light on 12 April 1998, is named after Swiss mathematicianLeonhard Paul Euler.[1][2]
The Euler telescope uses theCORALIE instrument to search forexoplanets. In addition, the telescope uses the multi-purposeEulerCam (ecam), a high precisionphotometry instrument, and a smaller, piggyback mounted telescope, called "Pisco".[2] Its first discovery was a planet in orbit aroundGliese 86, determined to be ahot Jupiter with an orbital period of only 15.8 earth days and about four times the mass of Jupiter.[3] Since then, many other exoplanets have been discovered or examined in follow-up observations.
Together with theMercator Telescope, Euler was part of the Southern Sky extrasolar Planet search Programme, which has discovered numerous extrasolar planets.[4] 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.[5]
The CORALIE spectrograph is anechelle- typespectrograph used for astronomy. It is a copy of theELODIE spectrograph used byMichel Mayor andDidier Queloz to detect the planet orbiting a star . In April 1998 it was built and installed at the Euler Telescope. Later in 2007 it was upgraded byDidier Queloz and his team to increase its performances to supportWide Angle Search for Planets program andNext-Generation Transit Survey. The instrument is optimized to measureDoppler effect on a star'selectromagnetic spectrum with great precision to detect the gravitational tug of an exoplanet orbiting around it.[6][7] It also known as "radial velocity" or "wobble" method, is an indirectdetection method. The mass of the planet can be estimated from these measurements.
The spectrograph participates in theSouthern Sky extrasolar Planet search Programme initiated byMichel Mayor
In 2010 visible camera EulerCam was installed byDidier Queloz. Camera main objective was to measure planet bytransit method by supporting ground base program such asWide Angle Search for Planets . The size of an exoplanet can be estimated using the transit method. 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 three-pixel sampling. The detectorcharge-coupled device is 2k X 2k with a 15 micrometer pixel size.
The first five planetary object discovered using CORALIE are
| Planet | Announced in | Refs |
|---|---|---|
| Gliese 86 b | 1998 | [6] |
| HD 75289 b | 1999 | [8] |
| Eiger | 1999 | [8] |
| Beirut | 1999 | [9][10] |
| GJ 3021 b | 2000 | [11] |
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