High Accuracy Radial Velocity Planet Searcher High Accuracy Radial Velocity Planet Searcher is a high-precision echelle planet-finding spectrograph installed in 2002 on the ESO's 3.6m telescope at La Silla Observatory in Chile . The first light was achieved in February 2003 . HARPS has discovered over 130 exoplanets to date, with the first one in 2004, making it the most successful planet finder behind the Kepler space observatory . It is a second-generation radial-velocity spectrograph, based on experience with the ELODIE and CORALIE instruments.Characteristics The HARPS can attain a precision of 0.97 m/s, with an effective precision of the order of 30 cm s−1 , making it one of only two instruments worldwide with such accuracy. This is due to a design in which the target star and a reference spectrum from a thorium lamp are observed simultaneously using two identical optic fibre feeds, and to careful attention to mechanical stability: the instrument sits in a vacuum vessel which is temperature-controlled to within 0.01 kelvins. The precision and sensitivity of the instrument is such that it incidentally produced the best available measurement of the thorium spectrum. Planet-detection is in some cases limited by the seismic pulsations of the star observed rather than by limitations of the instrument.principal investigator on the HARPS is Michel Mayor who, along with Didier Queloz and Stéphane Udry , have used the instrument to characterize the Gliese 581 planetary system , home to one of the smallest known exoplanets orbiting a normal star, and two super-Earths whose orbits lie in the star's habitable zone .super-Earth only around low-mass stars as these are more affected by gravitational tug from planets and have habitable zones close to the host star .Discoveries This is an incomplete list of exoplanets discovered by the HARPS. The list is sorted by the date of the discovery's announcement. As of December 2017, the list contains 134 exoplanets.HD 330075 b 10 February 2004Mu Arae c25 August 2004 HD 2638 b 22 March 2005 HD 27894 b 22 March 2005 HD 63454 b 22 March 2005 HD 93083 b 30 March 2005 HD 101930 b 30 March 2005 Gliese 581b 8 September 2005 HD 4308 b 12 October 2005HD 212301 b25 January 2006
HD 171028 b 7 August 2007 HD 40307 b27 June 2008 HD 40307 c 27 June 2008 HD 40307 d 27 June 2008 Gliese 176 b 4 September 2008 BD-17°63 b 26 October 2008HD 20868 b26 October 2008 HD 73267 b 26 October 2008 HD 131664 b 26 October 2008 HD 145377 b26 October 2008
BD-08°2823 b 16 December 2009BD-08°2823 c 16 December 2009 HD 5388 b 16 December 2009 HD 181720 b 16 December 2009 HD 190984 b 16 December 2009 HD 125612 c 29 December 2009 HD 125612 d 29 December 2009 HD 215497 b 29 December 2009 HD 215497 c 29 December 2009 HIP 5158 b29 December 2009
HD 89839 b 17 December 2010HD 167677 b 17 December 2010 HD 10180 b 23 November 2010 HD 10180 c 23 November 2010 HD 10180 d 23 November 2010 HD 10180 e 23 November 2010 HD 10180 f 23 November 2010 HD 10180 g 23 November 2010 HD 10180 h 23 November 2010 HD 63765 b 1 July 2011
HD 85512 b 17 August 2011HR 7722 c 17 August 2011 HD 1461 c 12 September 2011HD 13808 b 12 September 2011 HD 13808 c 12 September 2011 HD 20003 b12 September 2011 HD 20003 c 12 September 2011 HD 20781 b12 September 2011 HD 20781 c 12 September 2011 HD 21693 b 12 September 2011
HD 51608 c 12 September 2011 HD 93385 b 12 September 2011 HD 93385 c 12 September 2011 HD 96700 b 12 September 2011 HD 96700 c 12 September 2011 HD 126525 b 12 September 2011 HD 134060 b 12 September 2011 HD 134060 c 12 September 2011 HD 134606 b 12 September 2011 HD 134606 c 12 September 2011
HD 215152 c 12 September 2011 HD 215456 b 12 September 2011 HD 215456 c 12 September 2011 Gliese 667 Cc 21 November 2011 HD 10180 i 5 April 2012 HD 10180 j 5 April 2012 GJ 3470 b 22 June 2012 Gliese 676 c 29 June 2012Gliese 676 d 29 June 2012 Gliese 676 e 29 June 2012
— M sin i brown dwarf — brown dwarf — shorter periodGallery
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