List of exoplanets discovered before 2000
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This is a list of exoplanets discovered before 2000.[1]
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,[2] the planet Gamma Cephei Ab was not confirmed until 2003,[3] 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 (MJ) | Radius (RJ) | Period (days) | Semi-major axis (AU) | Temp. (K) | Discovery method | Disc. Year | Distance (light years) | Host star mass (M☉) | Host star temp. (K) | Remarks and refs |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 16 Cygni Bb | 2.38±0.04 | 798.5±1 | 1.693 | radial vel. | 1996 | 68.91±0.02 | 1.010±0.024 | 5751±11 | [a] | ||
| 23 Librae b | 1.8+1.2 −0.2 |
258.25±0.025 | 0.82±0.01 | radial vel. | 1999 | 85.39±0.08 | 1.12+0.01 −0.02 |
5762±9 | [b] | ||
| 47 Ursae Majoris b | ≥2.395±0.079 | 1,075.61+0.79 −0.67 |
2.06+0.032 −0.033 |
200 | radial vel. | 1996 | 45.30±0.06 | 1.02±0.06 | 5,880±10 | [c]Proper name Taphao Thong[7] | |
| 51 Pegasi b | 0.46±0.02 | 1.2±0.1 | 4.230785±0.000036 | 0.0527±0.0030 | 1,250 | radial vel. | 1995 | 50.64±0.04 | 1.09±0.02 | 5,768±8 | [d]Proper name Dimidium.[7] First exoplanet discovered orbiting a main sequence star.[11] |
| 55 Cancri b | ≥0.868±0.028 | 14.651552±0.000036 | 0.118±0.002 | 700 | radial vel. | 1996 | 41.05±0.02 | 0.905±0.015 | 5,172±18 | [e]Proper name Galileo[7] | |
| 70 Virginis b | 8.0+2.9 −0.7 |
116.69335+0.00093 −0.00097 |
0.478+0.004 −0.005 |
radial vel. | 1996 | 59.03±0.08 | 1.09±0.02 | 5,473±32 | [f] | ||
| 109 Piscium b | 6.8+0.9 −0.3 |
1,075.50±0.69 | 2.14 | radial vel. | 1999 | 108.1 | 1.11 | 5600 | [g] | ||
| Gliese 86 b | 4.42 | 15.76491 | 0.11 | radial vel. | 1999 | 35.18 | 0.83 | 5182 | |||
| Gliese 876 b | 2.2756 | 61.1166 | 0.208317 | radial vel. | 1998 | 15.25 | 0.32 | 3129 | |||
| HD 75289 b | 0.456±0.010 | 3.50916±0.00002 | 0.047859±0.000002 | 1260 | radial vel. | 1999 | 94.66±0.05 | 1.141+0.020 −0.035 |
6184±43 | [15][16] | |
| HD 89744 b | >8.35±0.18 | 256.78±0.02 | 0.917±0.009 | radial vel. | 1999 | 125.8±0.2 | 1.37±0.09 | 6381±43 | [17] | ||
| HD 130322 b | 1.3+0.6 −0.1 |
10.70871±0.00018 | 0.093±0.001 | 720 | radial vel. | 1999 | 104.08±0.09 | 0.92±0.03 | 5387±44 | [5][16][18]Proper name Eiger[7] | |
| HD 168443 b | >8.09+0.24 −0.25 |
58.11164±0.00040 | 0.3006+0.0045 −0.0047 |
radial vel. | 1998 | 127.4±0.2 | 0.995±0.019 | 5491±44 | [19] | ||
| HD 177830 b | 1.69 | 410.1 | 1.14 | radial vel. | 1999 | 205.1 | 1.70 | 4901 | |||
| HD 187123 b | 0.523 | 3.0965828 | 0.0426 | radial vel. | 1998 | 150.1 | 1.0 | 5830 | |||
| HD 192263 b | 0.56 | 24.3556 | 0.15 | 486 | radial vel. | 1999 | 64.08 | 0.66 | 4976 | Proper name Beirut | |
| HD 195019 b | 3.98 | 18.20132 | 0.14 | radial vel. | 1998 | 123 | 1.21 | 5751 | |||
| HD 209458 b | 0.73 | 1.39 | 3.52474859 | 0.04707 | 1459 | radial vel. | 1999 | 157.8 | 1.23 | 6091 | Informally named Osiris |
| HD 210277 b | 1.29 | 442.19 | 1.13 | radial vel. | 1998 | 69.51 | 1.01 | 5538 | |||
| HD 217107 b | 1.30 | 7.12682 | 0.08 | radial vel. | 1998 | 65.47 | 1.00 | 5622 | |||
| HD 222582 b | 8.37 | ~1.12 | 572.38 | 1.34 | radial vel. | 1999 | 137.7 | 1.12 | 5790 | ||
| Iota Horologii b | 2.27 | 302.8 | 0.92 | radial vel. | 1999 | 56.51 | 1.25 [20] | 6167 | |||
| PSR B1257+12 b | 0.000063 | 25.262±0.003 | 0.19 | 266 | timing | 1994 | 2300±100 | 1.4 | [21]Proper name Draugr[7]. Least massive exoplanet known.[22] | ||
| PSR B1257+12 c | 0.014±0.001 | 66.5419±0.0001 | 0.36 | 193 | timing | 1992 | 2300±100 | 1.4 | [23][22]Proper name Poltergeist[7] | ||
| PSR B1257+12 d | 0.012±0.001 | 0.13 | 98.2114±0.0002 | 0.46 | 169 | timing | 1992 | 2300±100 | 1.4 | [24][22]Proper name Phobetor[7] | |
| PSR B1620-26 b | 2.5 | ~1.18 | 23.0 | timing | 1993 | 12400 | 1.35 | ||||
| Rho Coronae Borealis b | 1.045 | 39.8458 | 0.2196 | 614 | radial vel. | 1997 | 57.0 | 0.889 | 5627 | ||
| Tau Boötis b | 4.5+0.8 −0.2 |
1.06 | 3.31 | 0.0481±0.028 | 1,600 | radial vel. | 1996 | 50.92±0.09 | 1.35±0.3 | 6387±0.44 | [5][25][26][10][27] |
| Upsilon Andromedae b | 1.70+0.33 −0.24 |
~1.8 | 4.617111±0.000014 | 0.0594±0.0003 | 1,670-1,920 | radial vel. | 1996 | 40.0±0.1 | 1.23+0.03 −0.09 |
6,614±0.77 | [28][29][30]Proper name Saffar[7] |
| Upsilon Andromedae c | 13.98+2.3 −5.3 |
241.26±0.64 | 0.829±0.043 | radial vel. | 1999 | 40.0±0.1 | 1.23+0.03 −0.09 |
6,614±0.77 | [31][32]Proper name Samh[7] | ||
| Upsilon Andromedae d | 10.25+0.7 −3.3 |
1.02 | 1,276.46±0.57 | 2.350±0.014 | 218 | radial vel. | 1999 | 40.0±0.1 | 1.23+0.03 −0.09 |
6,614±0.77 | [31][32][33]Proper name Majriti[7] |
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.[34] In 1991 it was reported an exoplanet 10 times the mass of Earth was discovered around the pulsar, PSR B1829-10.[35] It was subsequently retracted later in 1992.
