最小的系外行星列表

以下是迄今為止發現的最小的 系外行星列表，就有形的大小，按半徑排序。但其中一些未經證實和/或仍有爭議。

克卜勒-37系統中的行星和太陽系中天體的大小比較。

列表

本表是動態列表，或許永遠不會完結。歡迎您參考可靠來源來查漏補缺。

以地球半徑為單位列出行星半徑（R_地球）。所有列出的系外行星都小於地球，最大為0.7地球半徑。NASA系外行星檔案（英語：NASA Exoplanet Archive）是最主要的數據來源^[1][2]。

系外行星	半徑 （R地球）	註解和參考資料
SDSS J1228+1040 b (SDSS J122859.92+104033.0 b, WD 1226+110 b)	0.0101+0.0504 −0.0085	Extrasolar planetesimal. Remnant iron core.[3]
PSR B1828-11 b	0.016	Unconfirmed, controversial[1]
Ceres	0.07466	Shown for comparison
WD 1145+017 b	~0.15	Extrasolar planetesimal.[4]
Pluto	0.1825	Shown for comparison
Moon	0.2739	Shown for comparison
Kepler-37b	6999296000000000000♠0.296±0.037	Smallest known exoplanet.[5]
Kepler-1520b	~0.3	Disintegrating planets with poorly known radii, all thought to be smaller than Mercury.[6][7]
KOI-2700b
K2-22b
PSR B1257+12 b (Draugr)	~0.338	Least massive known exoplanet, at 0.02 Earth masses. Radius estimated from mass-radius relationship.[8]
Kepler-37e	6999370000000000000♠0.37±0.18	Dubious[9]
Mercury	0.3825	Shown for comparison
Kepler-444b	6999403000000000000♠0.403+0.016 −0.014	[10]
Kepler-102b	6999470000000000000♠0.47±0.02
Kepler-444c	6999497000000000000♠0.497+0.021 −0.017	[10]
Kepler-1971b (KOI-4777.01)	6999510000000000000♠0.51±0.03	[11]
Kepler-1308b	6999520000000000000♠0.52+0.06 −0.05
Kepler-138b	6999522000000000000♠0.522±0.032
Kepler-444d	6999530000000000000♠0.530+0.022 −0.019	[10]
Mars	0.5314	Shown for comparison
Kepler-62c	6999540000000000000♠0.54±0.03
Kepler-444e	6999546000000000000♠0.546+0.017 −0.015	[10]
KOI-115.03 (Kepler-105d)	6999550000000000000♠0.55+0.08 −0.07	Unconfirmed[12]
Kepler-42d	6999570000000000000♠0.57±0.18
Kepler-102c	6999580000000000000♠0.58±0.02
KOI-1843.03	0.59	Unconfirmed
Kepler-1583b	6999600000000000000♠0.60+0.09 −0.05
Kepler-1087b	6999610000000000000♠0.61+0.17 −0.05
K2-89b	6999615000000000000♠0.615±0.080
Kepler-1877b	0.624
Kepler-1371c	6999640000000000000♠0.64+0.07 −0.05
UCF-1.02	0.64	Dubious[13][14]
Kepler-1130d	0.645
Kepler-1351b	6999650000000000000♠0.65+0.05 −0.04
Kepler-1542c	6999650000000000000♠0.65+0.09 −0.06
UCF-1.01	0.65	Dubious[13][14]
Kepler-271d	6999660000000000000♠0.66±0.05
Kepler-431c	0.668
Kepler-1558b	6999680000000000000♠0.68+0.06 −0.04
K2-116b	6999690000000000000♠0.69±0.04
Kepler-141b	6999690000000000000♠0.69±0.05
K2-297b (EPIC 201497682 b)	6999692000000000000♠0.692+0.059 −0.048
LHS 1678 b	6999696000000000000♠0.696±0.044
Kepler-1349b	6999700000000000000♠0.700+0.630 −0.110
Kepler-378c	6999700000000000000♠0.70±0.05
K2-266c	6999705000000000000♠0.705+0.096 −0.085
Kepler-1339b	6999710000000000000♠0.71+0.06 −0.04
Gliese 367 b	6999718000000000000♠0.718±0.054	Smallest known exoplanet within 10 parsecs.

相關條目

• List of largest exoplanets
• 太陽系外行星之最列表
• 系外行星列表

參考資料

1. Staff. Exoplanet Catalog. Extrasolar Planets Encyclopaedia. 10 July 2017 [10 July 2017]. （原始內容存檔於2012-07-05）.
2. Planetary Systems Composite Data. NASA Exoplanet Archive. [12 December 2021]. （原始內容存檔於2020-10-07）.
3. Planet SDSS J1228+1040 b. exoplanet.eu. [2019-08-05]. （原始內容存檔於2019-10-19）.
4. Vanderburg, Andrew; John Asher Johnson; Rappaport, Saul; Bieryla, Allyson; Irwin, Jonathan; John Arban Lewis; Kipping, David; Brown, Warren R.; Dufour, Patrick; Ciardi, David R.; Angus, Ruth; Schaefer, Laura; Latham, David W.; Charbonneau, David; Beichman, Charles; Eastman, Jason; McCrady, Nate; Wittenmyer, Robert A.; Wright, Jason T. A disintegrating minor planet transiting a white dwarf. Nature. 2015, 526 (7574): 546–549. Bibcode:2015Natur.526..546V. PMID 26490620. S2CID 4451207. arXiv:1510.06387 . doi:10.1038/nature15527.
5. Simukoff, E.; et al. Below One Earth Mass: The Detection, Formation, and Properties of Subterrestrial Worlds. Space Science Reviews. 2013, 180 (1–4): 71. Bibcode:2013SSRv..180...71S. S2CID 118597064. arXiv:1308.6308 . doi:10.1007/s11214-013-0019-1.
6. Ansdell, M.; Hirano, T.; Gaidos, E. Monitoring of the D doublet of neutral sodium during transits of two 'evaporating' planets. Monthly Notices of the Royal Astronomical Society. 2019, 485 (3): 3876–3886. arXiv:1903.06217 . doi:10.1093/mnras/stz693. [...]the radii are not known but are thought to be smaller than Mercury (0.36R⊕).
7. Garai, Z. Light-curve analysis of KOI 2700b: The second extrasolar planet with a comet-like tail. Astronomy & Astrophysics. 2018, 611: A63. Bibcode:2018A&A...611A..63G. S2CID 118885868. arXiv:1712.07461 . doi:10.1051/0004-6361/201629676. We confirmed the disintegrating-planet scenario of KOI 2700b.
8. Exoplanet-catalog. [2022-11-28]. （原始內容存檔於2022-02-10）.
9. Rajpaul, V. M.; Buchhave, L. A.; Lacedelli, G.; Rice, K.; Mortier, A.; Malavolta, L.; Aigrain, S.; Borsato, L.; Mayo, A. W.; Charbonneau, D.; Damasso, M.; Dumusque, X.; Ghedina, A.; Latham, D. W.; López-Morales, M.; Magazzù, A.; Micela, G.; Molinari, E.; Pepe, F.; Piotto, G.; Poretti, E.; Rowther, S.; Sozzetti, A.; Udry, S.; Watson, C. A., A HARPS-N mass for the elusive Kepler-37d: A case study in disentangling stellar activity and planetary signals, Monthly Notices of the Royal Astronomical Society, 2021, 507 (2): 1847–1868, arXiv:2107.13900 , doi:10.1093/mnras/stab2192
10. Campante, T.; et al. KOI-3158: The oldest known system of terrestrial-size planets. EPJ Web of Conferences. 2015, 101: 02004. Bibcode:2015EPJWC.10102004C. S2CID 16191462. arXiv:1501.07869 . doi:10.1051/epjconf/201510102004.
11. Cañas, Caleb I.; Mahadevan, Suvrath; Cochran, William D.; Bender, Chad F.; Feigelson, Eric D.; Harman, C. E.; Kopparapu, Ravi Kumar; Caceres, Gabriel A.; Diddams, Scott A.; Endl, Michael; Ford, Eric B.; Halverson, Samuel; Hearty, Fred; Jones, Sinclaire; Kanodia, Shubham; Lin, Andrea S. J.; Metcalf, Andrew J.; Monson, Andrew; Ninan, Joe P.; Ramsey, Lawrence W.; Robertson, Paul; Roy, Arpita; Schwab, Christian; Stefánsson, Guđmundur. A Hot Mars-sized Exoplanet Transiting an M Dwarf. The Astronomical Journal. 2022, 163 (1): 3. Bibcode:2022AJ....163....3C. S2CID 244954104. arXiv:2112.03958 . doi:10.3847/1538-3881/ac3088.
12. Kepler-105. NASA Exoplanet Archive. [12 December 2021].
13. Stevenson, Kevin B.; et al. A Hubble Space Telescope Search for a Sub-Earth-sized Exoplanet in the GJ 436 System. The Astrophysical Journal. 2014, 796 (1). 32. Bibcode:2014ApJ...796...32S. S2CID 118412895. arXiv:1410.0002 . doi:10.1088/0004-637X/796/1/32.
14. Lanotte, A. A.; et al. A global analysis of Spitzer and new HARPS data confirms the loneliness and metal-richness of GJ 436 b. Astronomy and Astrophysics. 2014, 572. A73 [2022-11-28]. Bibcode:2014A&A...572A..73L. S2CID 55405647. arXiv:1409.4038 . doi:10.1051/0004-6361/201424373. （原始內容存檔於2022-10-06）.