There are 7,408 known exoplanets, or planets outside the Solar System that orbit a star, as of January 26, 2024; only a small fraction of these are located in the vicinity of the Solar System. [2] Within 10 parsecs (32.6 light-years ), there are 106 exoplanets listed as confirmed by the NASA Exoplanet Archive. [note 1] [3] Among the over 500 known stars and brown dwarfs within 10 parsecs, [4] [note 2] around 60 have been confirmed to have planetary systems; 51 stars in this range are visible to the naked eye, [note 3] [6] eight of which have planetary systems.
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 2024 is one around Struve 2398 A (11.5 ly). The closest exoplanets are those found orbiting the star closest to the Solar System, which is Proxima Centauri 4.25 light-years away. The first confirmed exoplanet discovered in the Proxima Centauri system was Proxima Centauri b, in 2016. 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 stars. A majority are significantly larger than Earth, but a few have similar masses, including planets around YZ Ceti, Gliese 367, Proxima Centauri, and Barnard's Star which may be less massive than Earth. Several confirmed exoplanets are hypothesized to be potentially habitable, with Proxima Centauri b and GJ 1002 b (15.8 ly) considered among the most likely candidates. [7] The International Astronomical Union has assigned proper names to some known extrasolar bodies, including nearby exoplanets, through the NameExoWorlds project. Planets named in the 2015 event include the planets around Epsilon Eridani (10.5 ly) and Fomalhaut, [note 4] [10] while planets named in the 2022 event include those around Gliese 436, Gliese 486, and Gliese 367. [11]
° | Mercury, Earth and Jupiter (for comparison purposes) |
# | Confirmed multiplanetary systems |
↑ | Exoplanets believed to be potentially habitable [7] |
Host star system | Companion exoplanet (in order from star) | Notes and additional planetary observations | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Name | Distance (ly) | Apparent magnitude (V) | Mass (M☉) | Label [note 5] | Mass (ME) [note 6] | Radius (R🜨) | Semi-major axis (AU) | Orbital period (days) | Eccentricity | Inclination (°) | Discovery method | Discovery year | |
Sun ° | 0.000016 | −26.7 | 1 | Mercury | 0.055 | 0.3829 | 0.387 | 88.0 | 0.205 | — | — | — | — |
Earth | 1 | 1 | 1 | 365.3 | 0.0167 | — | — | — | |||||
Jupiter | 317.8 | 10.973 | 5.20 | 4,333 | 0.0488 | — | — | — | |||||
Proxima Centauri # | 4.2465 | 11.13 | 0.123 | d | ≥0.26 | — | 0.0289 | 5.122 | 0.04 | — | RV | 2022 | [13] [14] one disputed candidate (c) [15] [16] [17] [18] |
b ↑ | ≥1.07 | — | 0.0486 | 11.19 | 0.02 | — | RV | 2016 | |||||
Barnard's Star | 5.9629 | 9.51 | 0.162 | b | ≥0.37 | — | 0.0229 | 3.153 | 0.16 | — | RV | 2024 | [19] [20] |
Lalande 21185 # | 8.304 | 7.52 | 0.46 | b | ≥2.69 | — | 0.0788 | 12.94 | 0.06 | — | RV | 2019 | 1 candidate [21] |
c | ≥13.6 | — | 2.94 | 2,946 | 0.13 | — | RV | 2021 | |||||
Epsilon Eridani | 10.489 | 3.73 | 0.781 | Ægir | 242 | — | 3.53 | 2,689 | 0.26 | 166.5 | RV | 2000 | 1 inferred planet, 1 or possibly 2 inner debris discs, and an outer disc [22] [23] |
Lacaille 9352 # | 10.724 | 7.34 | 0.489 | b | ≥4.2 | — | 0.068 | 9.262 | 0.03 | — | RV | 2019 | 1 candidate [24] [25] |
c | ≥7.6 | — | 0.120 | 21.79 | 0.03 | — | RV | 2019 | |||||
Ross 128 | 11.007 | 11.1 | 0.168 | b ↑ | ≥1.40 | — | 0.0496 | 9.866 | 0.12 | — | RV | 2017 | [26] |
Gliese 725 A | 11.491 | 8.94 | 0.330 | b | ≥2.78 | — | 0.068 | 11.2201 | 0.0 | — | RV | 2024 | [27] |
Groombridge 34 A# | 11.619 | 8.1 | 0.38 | b | ≥3.03 | — | 0.072 | 11.44 | 0.09 | ~54? | RV | 2014 | [28] [29] |
c | ≥36 | — | 5.4 | 7,600 | 0.27 | ~54? | RV | 2018 | |||||
Epsilon Indi A | 11.867 | 4.83 | 0.762 | b | 2005 | — | 28.4 | 63,400 | 0.40 | 103.7 | RV | 2018 | nearest exoplanet directly imaged [30] [31] |
Tau Ceti # | 11.912 | 3.50 | 0.78 | g | ≥1.75 | — | 0.133 | 20.0 | 0.06 | ~35? | RV | 2017 | 4 disputed candidates [32] [33] [7] [34] [35] [36] |
h | ≥1.8 | — | 0.243 | 49.4 | 0.23 | ~35? | RV | 2017 | |||||
e | ≥3.9 | — | 0.538 | 163 | 0.18 | ~35? | RV | 2017 | |||||
f | ≥3.9 | — | 1.33 | 640 | 0.16 | ~35? | RV | 2017 | |||||
GJ 1061 # | 11.984 | 7.52 | 0.113 | b | ≥1.37 | — | 0.021 | 3.204 | <0.31 | — | RV | 2019 | two solutions for d's orbit [37] |
c ↑ | ≥1.74 | — | 0.035 | 6.689 | <0.29 | — | RV | 2019 | |||||
d ↑ | ≥1.64 | — | 0.054 | 13.03 | <0.53 | — | RV | 2019 | |||||
YZ Ceti # | 12.122 | 12.1 | 0.130 | b | ≥0.70 | — | 0.0163 | 2.021 | 0.06 | — | RV | 2017 | [38] |
c | ≥1.14 | — | 0.0216 | 3.060 | 0.0 | — | RV | 2017 | |||||
d | ≥1.09 | — | 0.0285 | 4.656 | 0.07 | — | RV | 2017 | |||||
Luyten's Star # | 12.348 | 11.94 | 0.29 | c | ≥1.18 | — | 0.0365 | 4.723 | 0.10 | — | RV | 2017 | [39] [24] |
b ↑ | ≥2.89 | — | 0.0911 | 18.65 | 0.17 | — | RV | 2017 | |||||
d | ≥10.8 | — | 0.712 | 414 | 0.17 | — | RV | 2019 | |||||
e | ≥9.3 | — | 0.849 | 542 | 0.03 | — | RV | 2019 | |||||
Teegarden's Star # | 12.497 | 15.40 | 0.08 | b ↑ | ≥1.16 | — | 0.0259 | 4.906 | 0.03 | — | RV | 2019 | [40] [41] |
c ↑ | ≥1.05 | — | 0.0455 | 11.42 | 0.04 | — | RV | 2019 | |||||
d | ≥0.82 | — | 0.0791 | 26.13 | 0.07 | — | RV | 2024 | |||||
Wolf 1061 # | 14.050 | 10.1 | 0.25 | b | ≥1.91 | — | 0.0375 | 4.887 | 0.15 | — | RV | 2015 | [39] |
c ↑ | ≥3.41 | — | 0.0890 | 17.87 | 0.11 | — | RV | 2015 | |||||
d | ≥7.7 | — | 0.470 | 217 | 0.55 | — | RV | 2015 | |||||
TZ Arietis | 14.578 | 12.30 | 0.14 | b | ≥67 | — | 0.88 | 771 | 0.46 | — | RV | 2019 | 2 refuted candidates [24] [42] [43] |
Gliese 687 # | 14.839 | 9.15 | 0.41 | b | ≥17.2 | — | 0.163 | 38.14 | 0.17 | — | RV | 2014 | [24] [42] |
c | ≥16.0 | — | 1.165 | 728 | 0.40 | — | RV | 2019 | |||||
Gliese 674 | 14.849 | 9.38 | 0.35 | b | ≥11.1 | — | 0.039 | 4.694 | 0.20 | — | RV | 2007 | [44] |
Gliese 876 # | 15.238 | 10.2 | 0.33 | d | 6.68 | — | 0.0210 | 1.938 | 0.04 | 56.7 | RV | 2005 | [45] |
c | 235 | — | 0.1309 | 30.10 | 0.26 | 56.7 | RV | 2000 | |||||
b | 749 | — | 0.2098 | 61.10 | 0.03 | 56.7 | RV | 1998 | |||||
e | 16 | — | 0.3355 | 123.6 | 0.05 | 56.7 | RV | 2010 | |||||
GJ 1002 # | 15.806 | 13.84 | 0.12 | b ↑ | ≥1.08 | — | 0.0457 | 10.35 | — | — | RV | 2022 | [46] |
c ↑ | ≥1.36 | — | 0.0738 | 21.2 | — | — | RV | 2022 | |||||
Gliese 832 | 16.200 | 8.67 | 0.45 | b | 315 | — | 3.7 | 3,853 | 0.05 | 51 or 134 | RV | 2008 | 1 refuted candidate [47] [48] |
GJ 3323 # | 17.531 | 12.2 | 0.164 | b | ≥2.0 | — | 0.0328 | 5.36 | 0.2 | — | RV | 2017 | [39] |
c | ≥2.3 | — | 0.126 | 40.5 | 0.2 | — | RV | 2017 | |||||
Gliese 251 | 18.215 | 9.65 | 0.372 | b | ≥4.0 | — | 0.0818 | 14.2 | 0.10 | — | RV | 2020 | [49] |
Gliese 229 A# | 18.791 | 8.14 | 0.58 | c ↑ | ≥7.3 | — | 0.339 | 122 | 0.19 | — | RV | 2020 | Ab not confirmed until 2020 [50] |
b | ≥8.5 | — | 0.898 | 526 | 0.10 | — | RV | 2014 | |||||
Gliese 752 A | 19.292 | 9.13 | 0.46 | b | ≥12.2 | — | 0.343 | 106 | 0.10 | — | RV | 2018 | [51] [52] |
82 G. Eridani # | 19.704 | 4.26 | 0.79 | b | ≥2.15 | — | 0.126 | 18.3 | 0.06 | — | RV | 2011 | [53] |
c | ≥2.98 | — | 0.363 | 89.7 | 0.08 | — | RV | 2011 | |||||
d ↑ | ≥5.82 | — | 1.354 | 648 | 0.45 | — | RV | 2023 | |||||
Gliese 555 | 20.395 | 11.32 | 0.29 | b | ≥5.5 | — | 0.142 | 36.1 | 0.08 | — | RV | 2023 | 1 candidate [54] |
EQ Pegasi A | 20.400 | 10.38 | 0.436 | b | 718 | — | 0.643 | 284 | 0.35 | 69.2 | Astrometry | 2022 | [55] |
Gliese 581 # | 20.549 | 10.5 | 0.295 | e | 2.5 | — | 0.0280 | 3.15 | 0.01 | 47 | RV | 2009 | 3 refuted candidates and a disc [56] |
b | 20.5 | — | 0.0399 | 5.37 | 0.03 | 47 | RV | 2005 | |||||
c | 6.8 | — | 0.0718 | 12.9 | 0.03 | 47 | RV | 2007 | |||||
Gliese 338 B | 20.658 | 7.0 | 0.64 | b | ≥10.3 | — | 0.141 | 24.5 | 0.11 | — | RV | 2020 | [57] |
Gliese 625 | 21.131 | 10.2 | 0.30 | b | ≥2.8 | — | 0.0784 | 14.6 | ~0.1 | — | RV | 2017 | [58] |
HD 219134 # | 21.336 | 5.57 | 0.78 | b | 4.7 | 1.60 | 0.0388 | 3.09 | ~0 | 85.05 | RV | 2015 | [59] [60] [61] |
c | 4.4 | 1.51 | 0.065 | 6.77 | 0.062 | 87.28 | RV | 2015 | |||||
d | ≥16 | — | 0.237 | 46.9 | 0.138 | ~87? | RV | 2015 | |||||
f | ≥7.3 | — | 0.146 | 22.7 | 0.148 | ~87? | RV | 2015 | |||||
g | ≥11 | — | 0.375 | 94.2 | 0 | ~87? | RV | 2015 | |||||
h (e) | ≥108 | — | 3.11 | 2,247 | 0.06 | ~87? | RV | 2015 | |||||
LTT 1445 A# | 22.387 | 10.53 | 0.26 | c | 1.54 | 1.15 | 0.0266 | 3.12 | <0.22 | 87.43 | Transit | 2021 | 1 candidate [62] [63] [64] |
b | 2.87 | 1.30 | 0.0381 | 5.36 | <0.11 | 89.68 | Transit | 2019 | |||||
Gliese 393 | 22.953 | 8.65 | 0.41 | b | ≥1.71 | — | 0.0540 | 7.03 | 0.00 | — | RV | 2019 | [24] [65] |
Gliese 667 C# | 23.623 | 10.2 | 0.33 | b | ≥5.4 | — | 0.049 | 7.20 | 0.13 | ~52? | RV | 2009 | 5 dubious candidates [66] [7] [67] [68] [24] |
c ↑ | ≥3.9 | — | 0.1251 | 28.2 | 0.03 | ~52? | RV | 2011 | |||||
Gliese 514 | 24.878 | 9.03 | 0.53 | b | ≥5.2 | — | 0.421 | 140 | 0.45 | — | RV | 2022 | [69] |
GJ 1151 | 26.231 | 14.01 | 0.164 | c | ≥10.6 | — | 0.571 | 390 | — | — | RV | 2023 | 1 refuted candidate [70] [71] [72] [73] |
Gliese 486 | 26.351 | 11.395 | 0.32 | Su | 2.8 | 1.31 | 0.0173 | 1.47 | <0.05 | 88.4 | Transit | 2021 | [74] |
Gliese 686 | 26.613 | 9.58 | 0.42 | b | ≥7.1 | — | 0.097 | 15.5 | 0.04 | — | RV | 2019 | [75] [24] |
GJ 1289 | 27.275 | 12.67 [76] | 0.21 | b | ≥6.3 | — | 0.27 | 112 | 0 | — | RV | 2024 | [77] |
61 Virginis # | 27.836 | 4.74 | 0.95 | b | ≥6.1 | — | 0.05 | 4.22 | 0.05 | ~77? | RV | 2009 | a debris disc [78] |
c | ≥17.9 | — | 0.22 | 38.1 | 0.06 | ~77? | RV | 2009 | |||||
d | ≥10.5 | — | 0.47 | 123 | 0.12 | ~77? | RV | 2009 | |||||
CD Ceti | 28.052 | 14.001 | 0.161 | b | ≥3.95 | — | 0.0185 | 2.29 | 0 | — | RV | 2020 | [79] |
Gliese 785 # | 28.739 | 6.13 | 0.78 | b | ≥17 | — | 0.32 | 75 | 0.13 | — | RV | 2010 | [80] |
c | ≥24 | — | 1.18 | 530 | ~0.3 | — | RV | 2011 | |||||
Gliese 849 # | 28.750 | 10.4 | 0.49 | b | ≥270 | — | 2.26 | 1,910 | 0.05 | — | RV | 2006 | [81] [24] |
c | ≥300 | — | 4.82 | 5,520 | 0.087 | — | RV | 2006 | |||||
Gliese 433 # | 29.605 | 9.79 | 0.48 | b | ≥6.0 | — | 0.062 | 7.37 | 0.04 | — | RV | 2009 | [82] [24] [50] |
d | ≥5.2 | — | 0.178 | 36.1 | 0.07 | — | RV | 2020 | |||||
c | ≥32 | — | 4.82 | 5,090 | 0.12 | — | RV | 2012 | |||||
HD 102365 A | 30.396 | 4.89 | 0.85 | b | ≥16 | — | 0.46 | 122 | 0.34 | — | RV | 2010 | [83] |
Gliese 367 # | 30.719 | 9.98 | 0.45 | Tahay | 0.63 | 0.70 | 0.0071 | 0.322 | 0.06 | 79.89 | Transit | 2021 | [84] [85] |
c | ≥4.1 | — | 0.077 | 11.5 | 0.09 | ~80? | RV | 2023 | |||||
d | ≥6.0 | — | 0.159 | 34.4 | 0.14 | ~80? | RV | 2023 | |||||
Gliese 357 # | 30.776 | 10.9 | 0.34 | b | 6.1 | 1.17 | 0.035 | 3.93 | 0.02 | 88.92 | Transit | 2019 | [86] [24] |
c | ≥3.6 | — | 0.061 | 9.13 | 0.04 | ~89? | RV | 2019 | |||||
d ↑ | ≥7.7 | — | 0.204 | 55.7 | 0.03 | ~89? | RV | 2019 | |||||
Gliese 176 | 30.937 | 10.1 | 0.45 | b | ≥8.0 | — | 0.066 | 8.77 | 0.08 | — | RV | 2007 | 1 disputed candidate [87] [88] [24] |
GJ 3512 # | 30.976 | 13.11 | 0.123 | b | ≥147 | — | 0.338 | 204 | 0.44 | — | RV | 2019 | [89] |
c | ≥54 | — | >1.2 | >1390 | — | — | RV | 2019 | |||||
Wolf 1069 | 31.229 | 13.99 | 0.167 | b ↑ | ≥1.26 | — | 0.0672 | 15.6 | — | — | RV | 2023 | [90] |
AU Microscopii # | 31.683 | 8.63 | 0.50 | b | 17 | 4.38 | 0.0645 | 8.463 | 0.10 | 89.03 | Transit | 2020 | 2 candidates [91] [92] [93] [94] |
c | <28 | 3.51 | 0.1101 | 18.86 | 0 | 88.62 | Transit | 2020 | |||||
Gliese 436 | 31.882 | 10.67 | 0.41 | Awohali | 21.4 | 4.33 | 0.0280 | 2.64 | 0.15 | 85.8 | RV | 2004 | [95] [96] |
Gliese 49 | 32.158 | 8.9 | 0.57 | b | ≥16.4 | — | 0.106 | 17.3 | 0.03 | — | RV | 2019 | [97] |
GJ 3988 | 32.316 | 13.6 | 0.184 | b | ≥3.7 | — | 0.0405 | 6.944 | 0 | — | RV | 2023 | [98] |
HD 260655 # | 32.608 | 9.77 | 0.439 | b | 2.14 | 1.240 | 0.0293 | 2.780 | 0.039 | 87.35 | Transit | 2022 | [99] |
c | 3.09 | 1.533 | 0.0475 | 5.706 | 0.038 | 87.79 | Transit | 2022 |
Unlike for bodies within the 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. [100] 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 Wolf 359 (7.9 ly, in 2019), [24] LHS 288 (15.8 ly, in 2007), [101] and Gliese 682 (16.3 ly, in 2014). [50] There are also several instances where proposed exoplanets were later disproved by subsequent studies, including candidates around Alpha Centauri B (4.36 ly), [102] Barnard's Star (5.96 ly), [103] [104] Kapteyn's Star (12.8 ly), [105] Van Maanen 2 (14.1 ly), [106] Groombridge 1618 (15.9 ly), [107] AD Leonis (16.2 ly), [108] 40 Eridani A (16.3 ly), [109] [110] VB 10 (19.3 ly), [111] and Fomalhaut (25.1 ly). [112]
In 2021, a candidate planet was detected around Vega, though it has yet to be confirmed. [113] Another candidate planet, Candidate 1, was directly imaged around Alpha Centauri A, though it may also be a clump of asteroids or an artifact of the discovery mechanism. [114] Candidate planets around Luyten 726-8 (8.77 ly) [115] and GJ 3378 (25.2 ly) were reported in 2024. [77]
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. [116] Some proposed candidate exoplanets have been shown to be massive enough to fall above the threshold, and thus are likely brown dwarfs, as is the case for: SCR 1845-6357 B (13.1 ly), [117] SDSS J1416+1348 B (30.3 ly), [118] and WISE 1217+1626 B (30 ly). [119]
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 (7.4 ly), [120] UGPS 0722-05, (13.4 ly) [121] WISE 1541−2250 (18.6 ly), [122] and SIMP J01365663+0933473 (20.0 ly). [123]
Gliese 436 is a red dwarf located 31.9 light-years away in the zodiac constellation of Leo. It has an apparent visual magnitude of 10.67, which is much too faint to be seen with the naked eye. However, it can be viewed with even a modest telescope of 2.4 in (6 cm) aperture. In 2004, the existence of an extrasolar planet, Gliese 436 b, was verified as orbiting the star. This planet was later discovered to transit its host star.
TZ Arietis is a red dwarf in the northern constellation of Aries. With a normal apparent visual magnitude of 12.3, it is too faint to be seen by the naked eye, although it lies relatively close at a distance of 14.6 light-years. It is a flare star, which means it can suddenly increase in brightness for short periods of time.
Gliese 674(GJ 674) is a small red dwarf star with an exoplanetary companion in the southern constellation of Ara. It is too faint to be visible to the naked eye, having an apparent visual magnitude of 9.38 and an absolute magnitude of 11.09. The system is located at a distance of 14.85 light-years from the Sun based on parallax measurements, but is drifting closer with a radial velocity of −2.9 km/s. It is a candidate member of the 200 million year old Castor stream of co-moving stars.
Gliese 849, or GJ 849, is a small, solitary star in the equatorial constellation of Aquarius. It has a reddish hue and is invisible to the naked eye with an apparent visual magnitude of 10.41. The distance to this star is 28.8 light-years based on parallax, but it is drifting closer to the Sun with a radial velocity of −15.3 km/s. It has a pair of confirmed gas giant companions.
GJ 3323 is a nearby single star located in the equatorial constellation Eridanus, about 0.4° to the northwest of the naked eye star Psi Eridani. It is invisible to the naked eye with an apparent visual magnitude 12.20. Parallax measurements give a distance estimate of 17.5 light-years from the Sun. It is drifting further away with a radial velocity of +42.3 km/s. Roughly 104,000 years ago, the star is believed to have come to within 7.34 ± 0.16 light-years of the Solar System.
Gliese 251, also known as HIP 33226 or HD 265866, is a star located 18.2 light-years away from the Solar System. Located in the constellation of Gemini, it is the nearest star in this constellation. It is located near the boundary with Auriga, 49 arcminutes away from the bright star Theta Geminorum; due to its apparent magnitude of +9.89 it cannot be observed with the naked eye. The closest star to Gliese 251 is QY Aurigae, which is located 3.5 light years away.
GJ 625 is a small red dwarf star with an exoplanetary companion in the northern constellation of Draco. The system is located at a distance of 21.1 light-years from the Sun based on parallax, but is drifting closer with a radial velocity of −13 km/s. It is too faint to be visible to the naked eye, having an apparent visual magnitude of 10.13 and an absolute magnitude of 11.06.
Gliese 880 is a red dwarf star 22.4 light-years away in the northern constellation of Pegasus. No stellar companions to Gliese 880 have been discovered as of 2020.
Gliese 393, or GJ 393, is a single star with an orbiting exoplanet companion in the equatorial constellation of Sextans, positioned about 1.5° to the NNW of Beta Sextantis. At an apparent visual magnitude of 9.65, it is much too faint to be seen with the unaided eye. This star is located at a distance of 22.9 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +8.3 km/s. It has a large proper motion, traversing the celestial sphere at the rate of 0.950″ per year. The net velocity of this star relative to the Sun is 32.9 km/s. It shares a similar space motion as members of the AB Doradus moving group, but is considered a random interloper.
GJ 3512 is a nearby star in the northern circumpolar constellation of Ursa Major. It is invisible to the naked eye but can be observed using a telescope, having an apparent visual magnitude of +15.05. The star is located at a distance of 31 light-years from the Sun based on parallax. It has a high proper motion, traversing the celestial sphere at the rate of 1.311″ yr−1. The measurement of the star's radial velocity is poorly constrained, but it appears to be drifting further away at a rate of ~8 km/s.
Gliese 15 Ac is an exoplanet orbiting the nearby red dwarf star Gliese 15 A, which is part of a binary star system located about 11.6 light-years from the Sun. The planet was first proposed in October 2017 using radial velocity data from the CARMENES spectrograph, combined with measurements from the HARPS and HIRES spectrographs, and its existence was confirmed in April 2018 using HARPS-N data. It has a minimum mass 36 times that of Earth and orbits at around 5.4 astronomical units with a period of 7,600 days, an orbit which may have been sculpted by interaction with the companion star, Gliese 15 B. As of 2020, Gliese 15 Ac is the longest-period sub-Jovian planet discovered by radial velocity.