List of exoplanet firsts
Title Planet Star Year Notes
First extrasolar planet discovered in a solitary star system PSR B1257+12 B PSR B1257+12 C PSR B1257+12 1992 First extrasolar planets discovered . HD 114762 b was discovered in 1989 , but was not confirmed as a planet before 1996
First free-floating planet discovered S Ori J053810.1-023626 ( S Ori 70 ) N/A 2004 Has a mass of 3 M Jupiter ; needs confirmation
First planet discovered in a multiple main-sequence star system 55 Cancri b 55 Cancri 1996 55 Cnc has a distant red dwarf companion . The planet around Gamma Cephei was already suspected in 1988 . Gamma Cephei Ab is the first relatively close binary with a planet
First planet discovered in a circumbinary orbit PSR B1620-26 b PSR B1620-26 1993 Orbits a pulsar and a white dwarf . Discovery confirmed in 2003
First multiple planet extrasolar system discovered PSR B1257+12 A PSR B1257+12 B PSR B1257+12 C PSR B1257+12 1992 First pulsar planetary system
First multiple planet system in a multi-star system where multiple planets orbit multiple stars Kepler-47b Kepler-47c Kepler-47 2012 NN Serpentis cataclysmic variable is suspected to have at least 2 planets as of 2009
First planet discovered in globular cluster PSR B1620-26 b PSR B1620-26 1993 Located in Messier 4
First binary star system where both components have separate planetary systems HD 20781 b HD 20781 c HD 20782 b HD 20781 HD 20782 2011
By system type
This is a list of exoplanet discoveries that were the first by several criteria, including:
and others.