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
• 系外行星列表