List of nearest exoplanets

There are 4,301 known exoplanets, or planets outside our solar system that orbit a star, as of August 1, 2020; only a small fraction of these are located in the vicinity of the Solar System.[3] Within 10 parsecs (32.6 light-years), there are 97 exoplanets listed as confirmed by the NASA Exoplanet Archive.[a][4] Among the over 400 known stars within 10 parsecs,[b][5] around 60 have been confirmed to have planetary systems; 51 stars in this range are visible to the naked eye,[c][6] nine of which have planetary systems.

Exoplanet Fomalhaut b (Dagon), 25 light-years away, with its parent star Fomalhaut blacked out, as pictured by Hubble in 2012.[1] In 2020 this object was determined to be an expanding debris cloud from a collision of asteroids rather than a planet.[2]
Distribution of nearest exoplanets

The first report of an exoplanet within this range was in 1998 for a planet orbiting around Gliese 876 (15.3 light-years (ly) away), and the latest as of 2020 is one around AU Microscopii (32 ly). The closest exoplanet found is Proxima Centauri b, which was confirmed in 2016 to orbit Proxima Centauri, the closest star to our Solar System (4.25 ly). HD 219134 (21.6 ly) has six exoplanets, the highest number discovered for any star within this range.

Most known nearby exoplanets orbit close to their star and have highly eccentric orbits. A majority are significantly larger than Earth, but a few have similar masses, including two planets (around YZ Ceti, 12 ly) which may be less massive than Earth. Several confirmed exoplanets are hypothesized to be potentially habitable, with Proxima Centauri b and three around Gliese 667 C (23.6 ly) considered the most likely candidates.[7] The International Astronomical Union took a public survey in 2015 about renaming some known extrasolar bodies, including the planets around Epsilon Eridani (10.5 ly) and Fomalhaut.[d][8]

Exoplanets within 10 parsecs

Key to colors
° Mercury, Earth and Jupiter (for comparison purposes)
# Confirmed multiplanetary systems
Exoplanets believed to be potentially habitable[7]
Confirmed exoplanets[4]
Host star system Companion exoplanet (in order from star) Notes and additional planetary observations
Name Distance
(ly)
Apparent
magnitude

(V)
Mass
(M)
Label
[e]
Mass
(M)[f]
Radius
(R)
Semi-major axis
(AU)
Orbital period
(days)
Eccentricity
Inclination
(°)
Discovery year
Sun° 0−26.71 Mercury0.0550.38290.38788.0 0.205
Earth111365.30.0167
Jupiter317.810.9735.204,3330.0488
Proxima Centauri# 4.244111.130.123 b>1.2~1.1?0.048611.20.109~133?2016 [9][7][10][11][12] 1 candidate[13]
c71.4891,9280.041332020
Barnard's Star 5.9589.5110.144 b>4.20.4302320.042018 [14][15]
Wolf 359# 7.89513.540.09 c>3.80.0182.690.152019 [15]
b>43.91.8452,9400.042019
Lalande 21185 8.3077.520.46 b>2.90.0689.870.042017 [15]
Epsilon Eridani 10.4463.730.83 AEgir2483.392,5000.50~25?2000 1 inferred planet and a disc[16][17]
Lacaille 9352# 10.7217.340.503 b>4.10.0679.260.032019 [15]
c>9.00.11921.80.032019
d>6.50.17538.80.042019
Ross 128 11.00711.10.168 b>1.4~1.2?0.04969.870.122017 [18]
Struve 2398 B# 11.4909.70.248 b>15.70.26191.30.062019 [15]
c>13.10.4281920.032019
Groombridge 34 A# 11.6188.10.38 b>3.030.07211.40.094~61?2014 [19][20][21]
c365.47,6000.27~61?2018
Tau Ceti# 11.7533.500.78 g>1.70.13320.00.062017 2 retracted and 1 candidate
[22][23][7][24][25][26]
h>1.80.24349.40.232017
e>3.9~1.6?0.5381630.182017
f>3.91.336400.162017
Epsilon Indi A 11.8694.830.762 b103011.5516,5000.2664.252002 Not confirmed until 2018[27]

[28][29]

Gliese 1061# 11.9807.520.113 b>1.40.0213.20<0.312019 two solutions for d's orbit[30]
c>1.70.0356.69<0.292019
d>1.60.05212.4<0.542019
YZ Ceti# 12.10812.10.130 b>0.750.01561.970.02017 1 candidate
[31][32][15]
c>1.20.02093.060.042017
d>1.10.02764.660.032017
Luyten's Star# 12.19911.940.29 c>1.20.03654.720.122017 [7][33][15]
b>2.2~1.4?0.09018.60.032017
d>10.80.7124140.172019
e>9.30.8495420.032019
Teegarden's Star# 12.49615.400.08 b>1.10.02524.9102019 [34]
c>1.10.044311.402019
Kapteyn's Star# 12.8298.80.28 c>6.90.3111210.072014 [35] 1 disputed candidate[36][15]
Wolf 1061# 14.04610.10.25 b>1.90.03754.890.032015 [7][37][15]
c>3.6~1.5?0.0890 17.90.032015
d>6.50.4211840.022015
Gliese 83.1# 14.58412.300.14 c>4.00.0161.930.092019 [15]
d>26.00.4062430.152019
b>81.50.8817730.222019
Gliese 674 14.8399.380.35 b>11.20.0394.690.232007 [38][39][15]
Gliese 687# 14.8409.150.41 b>17.30.16338.10.032014 [40][15]
c>14.51.1937580.032019
Gliese 876# 15.25010.20.33 d6.80.02081.940.1259.52005 [41][15]
c2300.13330.20.00159.52000
b7200.21361.00.00159.51998
e150.3421250.1859.52010
Gliese 832# 16.1948.670.45 c>5.4~1.7?0.16435.70.062014 [7][42][15]
b>2063.673,8300.062008
AD Leonis 16.1979.520.41 b>23.10.0252.230.032019 [15]
40 Eridani A 16.3864.40.84 b>8.50.22442.40.04~72?2018 [43]
Gliese 3323# 17.53312.20.164 b>2.0~1.3?0.03285.360.22017 [44]
c>2.30.12640.50.22017
Gliese 251# 18.2049.650.372 b>3.30.02041.74~0.032017 [45][15]
c>22.20.9746070.032019
LP 816-60 18.31111.460.23 b2?93.92019 [15]
Gliese 205# 18.5927.970.63 b>10.30.10916.90.112019 [15]
c>13.80.6892710.042019
Gliese 229 A# 18.7778.140.58 c>7.30.3391220.192020 Ab not confirmed until 2020.[46]
b>8.50.8985260.102014
Gliese 752 A 19.2869.130.46 b>13.60.3381060.032018 [47][15]
Gliese 754 19.28912.230.18 b>9.80.27778.40.032019 [15]
Gliese 588# 19.2989.310.46 b>2.40.0495.810.042019 [15]
c>10.30.5302060.062019
82 G. Eridani# 19.5824.260.85 b>2.70.12118.3~02011 2 candidates
[48][49][50]
c>2.40.20440.1~02011
d>4.80.35090~02011
e>4.80.509147 0.292017
Gliese 784 20.0837.970.5 b>9.40.0596.660.052019 [15]
Gliese 555 20.37011.320.29 b>30.10.7274500.042019 [15]
Gliese 581# 20.54510.50.31 e>1.70.02823.150.0~45?2009 2 disputed candidates and a disc
[51][52][53][54]
b>160.04065.370.0~45?2005
c>5.50.07212.90.0~45?2007
Gliese 338 B 20.6587.00.64 b>10.30.14124.50.112020 [55]
Gliese 625 21.11410.20.30 b>2.80.078414.6~0.12017 [56]
HD 219134# 21.3065.570.78 b4.71.600.03883.09~085.062015 1 candidate, 2 dubious planets
[57][58]
c4.41.510.0656.770.06287.282015
d>16>1.610.23546.9 0.138~87?2015
h>1103.112,200 0.06~87?2015
Gliese 880 22.3998.640.59 b>8.50.18739.40.132019 [15]
LTT 1445 A 22.40910.530.26 b~2.21.350.03815.360.1689.472019 [59]
Gliese 393 22.9388.650.41 b>1.90.0557.030.032019 [15]
Gliese 667 C# 23.63210.20.33 b>5.40.0497.200.13~52?2009 5 dubious candidates
[60][7][61][62][15]
c>3.9~1.5?0.125128.20.03~52?2011
Gliese 514 24.8519.030.53 b>4.30.09715.00.052019 [15]
Gliese 300 26.46912.130.26 b>6.80.0508.330.292019 [15]
Gliese 686 26.6129.580.42 b>7.10.09715.50.042019 [63][15]
61 Virginis# 27.7414.740.95 b>5.10.05024.22~0.1~77?2009 a debris disc
[64]
c>180.21838.00.14~77?2009
d>230.4761230.35~77?2009
CD Ceti 28.08014.0010.161 b>4.00.01852.2902020 [65]
Gliese 785# 28.6996.130.78 b>170.32750.132010 [66]
c>241.18530~0.32011
Gliese 849# 28.71110.40.49 b>2702.261,9100.052006 [67][15]
c>3004.82 5,5200.0872006
Gliese 433# 29.5729.790.48 b>6.00.0627.370.042009 [68][15][46]
d>5.20.17836.10.072020
c>324.825,0900.122012
Gliese 3325 30.10911.730.27 b>11.80.07112.90.032019 [15]
HD 102365 A 30.3744.890.85 b>160.461220.342010 [69]
Gliese 357# 30.80310.90.34 b1.61.170.0353.930.0288.922019 [70][15]
c>3.60.0619.130.04~89?2019
d>7.70.20455.70.03~89?2019
Gliese 176# 30.87910.10.45 b>8.00.0668.770.082007 1 dubious planet[71][72][15]
c>7.40.14628.60.022019
Gliese 479 30.91210.660.43 b>5.10.07411.30.032019 [15]
Gliese 3512# 30.94913.110.123 b>1470.3382040.442019 [73]
c>54>1.2>13902019
AU Microscopii 31.7198.630.50 b<574.200.0668.460.10~902020 1 candidate[74]
Gliese 436 31.82010.670.41 b21.44.330.02802.640.1585.82004 1 candidate[15]
Gliese 49 32.1458.90.57 b>16.40.10617.30.032019 [15]

Excluded objects

Unlike for bodies within our Solar System, there is no clearly established method for officially recognizing an exoplanet. According to the International Astronomical Union, an exoplanet should be considered confirmed if it has not been disputed for five years after its discovery.[75] There have been examples where the existence of exoplanets has been proposed, but even after follow-up studies their existence is still considered doubtful by some astronomers. Such cases include: Alpha Centauri (4.36 ly, two in 2012[76] and 2013[77]), LHS 288 (15.6 ly, in 2007[78]), and Gliese 682 (16.6 ly, two in 2014[7][79][80]). There are also some instances where proposed exoplanets were later disproved by subsequent studies, such as candidates around Teegarden's star (12.6 ly),[81] Van Maanen 2 (13.9 ly),[82] Groombridge 1618 (15.9 ly),[83] and VB 10 (18.7 ly).[84]

The Working Group on Extrasolar Planets of the International Astronomical Union adopted in 2003 a working definition on the upper limit for what constitutes a planet: not being massive enough to sustain thermonuclear fusion of deuterium. Some studies have calculated this to be somewhere around 13 times the mass of Jupiter, and therefore objects more massive than this are usually classified as brown dwarfs.[85] Some proposed candidate exoplanets were later shown to be massive enough to fall above the threshold, and are likely brown dwarfs, as was the case for: SCR 1845-6357 B (12.6 ly),[86] SDSS J1416+1348 B (29.7 ly),[87] and WISE 1217+1626 B (30 ly).[88]

Excluded from the current list are known examples of potential free-floating sub-brown dwarfs, or "rogue planets", which are bodies that are too small to undergo fusion yet they do not revolve around a star. Known such examples include: WISE 0855–0714 (7.3 ly),[89] UGPS 0722-05, (13 ly)[90] WISE 1541−2250 (18.6 ly),[91] and SIMP J01365663+0933473 (20 ly).[92]

Statistics

Planetary systems

Systems by planet count
Exoplanets № of
systems
Systems
4 5 Tau Ceti, Luyten's Star, Gliese 876, 82 G. Eridani, HD 219134
3 9 Lacaille 9352, Gliese 1061, YZ Ceti, Wolf 1061, L 1159-16, Gliese 581, 61 Virginis, Gliese 433, Gliese 357
2 17
1 29
Total 60
Distribution of nearby planet-hosting systems
Distance
(light-years)
№ of known
star systems
№ of known
stars
№ of stars
hosting known
exoplanets
Percentage of
stars hosting
exoplanets
< 5 1 3 1 33%
5–10 8 11 3 27%
10–15 31 43 16 37%
15–20 57 77 13 17%
20–25 55 78 11 14%
25–32.6 ? ~200 16 ~8%
Total >413[93] 60 <14.5%
Systems visible with
the naked eye?
[c][94]
Visible host star? Systems
Yes (V < 6.5) 9
No (V > 6.5) 51

Exoplanets

Exoplanets by minimum estimated mass
Type Mass range[95]
Terran 0.5–5 M 45
Superterran 5–10 M 24
Neptunian 10–50 M 28
Jovian 50–600 M 9
Superjovian >600 M 3
Total 109
Exoplanets by orbital radius
Orbital radius Notes
< 0.4 AU 80 Mercury orbits at 0.39 AU
0.4–1.0 AU 16 Earth orbits at 1.0 AU
1.0–5 AU 11
> 5 AU 2 Jupiter orbits at 5.2 AU
Exoplanets by orbital period
Orbital period Notes
< 90 days 73 Mercury takes 88 days
90–365 days 17
1–10 years 14 Jupiter takes 11.9 years
> 10 years 5
Exoplanets by orbital eccentricity
Orbital eccentricity Notes
< 0.02 15 Earth's is 0.0167
0.02–0.20 78
Mercury's is 0.205
> 0.20 14
Exoplanets by discovery year
Year
1998 1
2000 2
2002 1
2004 1
2005 2
2006 2
2007 3
2008 1
2009 6
2010 3
2011 5
2012 1
2014 5
2015 7
2016 1
2017 16
2018 4
2019 43
2020 6
gollark: ++list_deleted
gollark: It wprks now!
gollark: ++exec```pythondef f(x, y, z): if y == 0: if z == 0: return x return f(x, 0, z - 1) * f(x, 0, z - 1) return f(x, y - 1, z) * f(x, y - 1, z)print(f(10, 10, 10))```
gollark: ++exec```luafunction f(x, y, z)if y == 0 thenif z == 0 thenreturn xendreturn f(x, 0, z - 1) * f(x, 0, z - 1)endreturn f(x, y - 1, z) * f(x, y - 1, z)endprint(f(3, 3, 3))```
gollark: Hmm.

See also

Notes

  1. ^ Listed values are primarily taken from NASA Exoplanet Archive,[4] but other databases include a few additional exoplanet entries tagged as "Confirmed" that are have yet to be compiled into the NASA archive. Such databases include:
    "Exoplanet Catalog". The Extrasolar Planets Encyclopaedia. Full table.
    "Exoplanets Data Explorer". Exoplanet Orbit Database. California Planet Survey. Click the "+" button to visualize additional parameters.
    "Open Exoplanet Catalogue". Click the "Show options" to visualize additional parameters. Archived from the original on 2017-09-02. Retrieved 2015-02-14.
  2. ^ For reference, the 104th closest known star system in November 2016 was 82 Eridani (19.7 ly).[96]
  3. ^ According to the Bortle scale, an astronomical object is visible to the naked eye under "typical" dark-sky conditions in a rural area if it has an apparent magnitude smaller than +6.5. To the unaided eye, the limiting magnitude is +7.6 to +8.0 under "excellent" dark-sky conditions (with effort).[94]
  4. ^ The star Epsilon Eridani was named Ran (after Rán, the Norse goddess of the sea), and the planet Epsilon Eridani b was named AEgir (after Ægir, Rán's husband),[97] while the planet Fomalhaut b was named Dagon (after Dagon, an ancient Syrian “fish god”[98]).[8]
  5. ^ Exoplanet naming convention assigns uncapitalized letters starting from b to each planet based on chronological order of their initial report, and in increasing order of distance from the parent star for planets reported at the same time. Omitted letters signify planets that have yet to be confirmed, or planets that have been retracted altogether.
  6. ^ Most reported exoplanet masses have very large error margins (typically, between 10% and 30%). The mass of an exoplanet has generally been inferred from measurements on changes in the radial velocity of the host star, but this kind of measurement only allows for an estimate on the exoplanet's orbital parameters, but not on their orbital inclination (i). As such, most exoplanets only have an estimated minimum mass (Mreal*sin(i)), where their true masses are statistically expected to come close to this minimum, with only about 13% chance for the mass of an exoplanet to be more than double its minimum mass.[99]

References

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