Didier Queloz

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Didier Queloz
Didier Queloz at the ESO 50th Anniversary Gala Event - 01.jpg
Queloz at the European Southern Observatory 50th anniversary gala, Residenz, Munich, October 11, 2012.
Born February 23, 1966 (1966-02-23) (age 48)
Nationality Swiss
Occupation Astronomer

Didier Queloz (born February 23, 1966) is a Geneva-based astronomer with a prolific record in finding extrasolar planets.

Didier Queloz was a Ph.D. student at the University of Geneva when he and Michel Mayor discovered the first exoplanet around a main sequence star.[1] Queloz performed an analysis on 51 Pegasi using radial velocity measurements (Doppler effect), and was astonished to find a planet with an orbital period of 4.2 days. He had been performing the analysis as an exercise to hone his skills.[2] The planet, 51 Pegasi b, challenged the then accepted views of planetary formation, being a hot Jupiter or roaster. He has received the 2011 BBVA Foundation Frontiers of Knowledge Award of Basic Sciences for developing new astronomical instruments and experimental techniques that led to the first observation of planets outside the solar system.


  1. ^ Overbye, Dennis (12 May 2013). "Finder of New Worlds". New York Times. Retrieved 13 May 2014. 
  2. ^ Mayor, Michael; Queloz, Didier (1995). "A Jupiter-mass companion to a solar-type star". Nature 378 (6555): 355–359. Bibcode:1995Natur.378..355M. doi:10.1038/378355a0.