List of smallest exoplanets

Below is a list of the smallest exoplanets so far discovered, in terms of physical size, ordered by radius. Some of these are unconfirmed and/or controversial.

A size comparison of the planets in the Kepler-37 system and objects in the Solar System

List

The sizes are listed in units of Earth radii (R⊕).[1] All planets listed are smaller than Earth and being up to 0.7 Earth radii.

This list is incomplete; you can help by adding missing items with reliable sources.
Exoplanet Radius (R⊕)
(Earth = 1) 		Notes
SDSS J1228+1040 b
(SDSS J122859.92+104033.0 b, WD 1226+110 b)		 0.01008808265784481?[2] Remnant iron core.
PSR B1828-11 b 0.016[3] Unconfirmed
KOI-115.03 (Kepler-105 d) 0.0258±0.0015[4] Unconfirmed, controversial
1 Ceres 0.074662903 Shown for comparison
WD 1145+017 b ~0.15[5] Controversial, Possibly least massive exoplanet.
134340 Pluto 0.182580746 Shown for comparison
Moon 0.273925995 Shown for comparison
Kepler-37b 0.3+0.05
−0.07[6]
PSR B1257+12 b 0.338?[7] Least massive exoplanet, at 0.02 Earth masses.
Mercury 0.38251803 Shown for comparison
Kepler-444 b 0.403[8]
Kepler-102 b 0.47
Kepler-444 c 0.497[8]
Kepler-1308 b 0.5
Kepler-138 b 0.52
Kepler-444 d 0.53[8]
Mars 0.531436186 Shown for comparison
Kepler-62c 0.54
Kepler-444e 0.546[8]
Kepler-42 d 0.57
Kepler-102 c 0.58
KOI-1843.03 0.59
Kepler-1087 b 0.59
Kepler-1583 b 0.59
K2-89 b 0.6
Kepler-1371 c 0.63
UCF-1.02 0.64 Unconfirmed, controversial
Kepler-1542 c 0.64
Kepler-1351 b 0.64
UCF-1.01 0.65 Unconfirmed, controversial
Kepler-271 d 0.65
Kepler-431 c 0.654
Kepler-1558 b 0.67
Kepler-1349 b 0.68
K2-266 c 0.69
Kepler-141 b 0.69
Kepler-1339 b 0.69
Kepler-378 c 0.7

See also

References
  1. Staff (10 July 2017). "Exoplanet Catalog". Extrasolar Planets Encyclopaedia. Retrieved 10 July 2017.
  2. "Planet SDSS J1228+1040 b". http://exoplanet.eu. Retrieved 2019-08-05. External link in |website= (help)
  3. "The Extrasolar Planet Encyclopaedia — Catalog Listing". exoplanet.eu. Retrieved 2019-12-29.
  4. "Open Exoplanet Catalogue - KOI-115.03". openexoplanetcatalogue.com. Retrieved 2019-08-05.
  5. 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. (2015). "A disintegrating minor planet transiting a white dwarf". Nature. 526 (7574): 546–549. arXiv:1510.06387. Bibcode:2015Natur.526..546V. doi:10.1038/nature15527. PMID 26490620.
  6. Simukoff, E.; et al. (2013). "Below One Earth Mass: The Detection, Formation, and Properties of Subterrestrial Worlds". arXiv:1308.6308. Bibcode:2013SSRv..180...71S. doi:10.1007/s11214-013-0019-1. Cite journal requires |journal= (help)
  8. Campante, T.; et al. (2015). "KOI-3158: The oldest known system of terrestrial-size planets". arXiv:1501.07869. Bibcode:2015EPJWC.10102004C. doi:10.1051/epjconf/201510102004. Cite journal requires |journal= (help)
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