List of exoplanets discovered before 2000

This is a list of exoplanets discovered before 2000.

For exoplanets detected only by radial velocity, the mass value is actually a lower limit. (See Minimum mass for more information.)

While the existence of a substellar companion to Gamma Cephei was suspected since 1988, the planet Gamma Cephei Ab was not confirmed until 2003, and that is listed as its discovery year in exoplanet databases. Thus, this planet is in the List of exoplanets discovered between 2000–2009.

Name Mass () Radius () Period (days) Semi-major axis (AU) Temp. (K) Discovery method Disc. Year Distance (light years) Host star mass () Host star temp. (K) Remarks and refs16 Cygni Bb1.693radial vel.199623 Librae bradial vel.199947 Ursae Majoris b200radial vel.1996Proper name Taphao Thong51 Pegasi b1,250radial vel.1995Proper name Dimidium. First exoplanet discovered orbiting a main sequence star.55 Cancri b700radial vel.1996Proper name Galileo70 Virginis bradial vel.1996109 Piscium b2.14radial vel.1999108.11.115600Gliese 86 b4.4215.764910.11radial vel.199935.180.835182Gliese 876 b2.275661.11660.208317radial vel.199815.250.323129HD 75289 b1260radial vel.1999HD 89744 bradial vel.1999HD 130322 b720radial vel.1999Proper name EigerHD 168443 bradial vel.1998HD 177830 b1.69410.11.14radial vel.1999205.11.704901HD 187123 b0.5233.09658280.0426radial vel.1998150.11.05830HD 192263 b0.5624.35560.15486radial vel.199964.080.664976Proper name BeirutHD 195019 b3.9818.201320.14radial vel.19981231.215751HD 209458 b0.731.393.524748590.047071459radial vel.1999157.81.236091Informally named OsirisHD 210277 b1.29442.191.13radial vel.199869.511.015538HD 217107 b1.307.126820.08radial vel.199865.471.005622HD 222582 b8.37~1.12572.381.34radial vel.1999137.71.125790Iota Horologii b2.27302.80.92radial vel.199956.511.25 6167PSR B1257+12 b0.0000630.19266timing19941.4Extrasolar Visions - PSR 1257+12 A Proper name Draugr. Least massive exoplanet known.PSR B1257+12 c0.36193timing19921.4Extrasolar Visions - PSR 1257+12 B extrasolar.net. Proper name PoltergeistPSR B1257+12 d0.130.46169timing19921.4Extrasolar Visions - PSR 1257+12 C Proper name PhobetorPSR B1620-26 b2.5~1.1836,52523.072timing1993124001.35Informally named MethuselahRho Coronae Borealis b1.04539.84580.2196614radial vel.199757.00.8895627Tau Boötis b1.063.311,600radial vel.1996Upsilon Andromedae b~1.81,670-1,920radial vel.1996Proper name SaffarUpsilon Andromedae cradial vel.1999Proper name SamhUpsilon Andromedae d1.02218radial vel.1999Proper name Majriti

Bodies previously considered as candidates HD 114762 b was once considered as the first discovered exoplanet. Found in 1989 by a team led by David Latham, it is now known to be a red dwarf star. In 1991 it was reported an exoplanet 10 times the mass of Earth was discovered around the pulsar, PSR B1829-10. It was subsequently retracted later in 1992.

Notes

Specific exoplanet lists

References