List Of Smallest Exoplanets
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Below is a list of the smallest
exoplanet An exoplanet or extrasolar planet is a planet outside the Solar System. The first confirmed detection of an exoplanet was in 1992 around a pulsar, and the first detection around a main-sequence star was in 1995. A different planet, first det ...
s so far discovered, in terms of physical size, ordered by radius.


List

The sizes are listed in units of
Earth radii Earth radius (denoted as ''R''🜨 or ''R''E) is the distance from the center of Earth to a point on or near its surface. Approximating the figure of Earth by an Earth spheroid (an oblate ellipsoid), the radius ranges from a maximum (equato ...
(). All planets listed are smaller than
Earth Earth is the third planet from the Sun and the only astronomical object known to Planetary habitability, harbor life. This is enabled by Earth being an ocean world, the only one in the Solar System sustaining liquid surface water. Almost all ...
and
Venus Venus is the second planet from the Sun. It is often called Earth's "twin" or "sister" planet for having almost the same size and mass, and the closest orbit to Earth's. While both are rocky planets, Venus has an atmosphere much thicker ...
, up to 0.7
Earth radii Earth radius (denoted as ''R''🜨 or ''R''E) is the distance from the center of Earth to a point on or near its surface. Approximating the figure of Earth by an Earth spheroid (an oblate ellipsoid), the radius ranges from a maximum (equato ...
. The
NASA Exoplanet Archive The NASA Exoplanet Archive is an online astronomical exoplanet catalog and data service that collects and serves public data that support the search for and characterization of extra-solar planets (exoplanets) and their host stars. It is part of ...
is used as the main data source. Radii listed in ''italics'' are estimates.


Excluded objects

Kepler-37 Kepler-37, also known as UGA-1785, is a G-type main-sequence star located in the constellation Lyra from Earth. It is host to exoplanets Kepler-37b, Kepler-37c, Kepler-37d and possibly Kepler-37e, all of which orbit very close to it. ...
e is listed with a radius of in the Exoplanet Archive based on KOI data, but the existence of this planet is doubtful, and assuming its existence, a 2023 study found a mass of , inconsistent with such a small radius. KOI-6705.01, listed as a potential very small planet in the KOI dataset, was shown to be a false positive in 2016.


Candidate planets

Below shows a list candidate planets below . These planets have yet to be confirmed.


See also

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List of largest exoplanets Below is a list of the largest exoplanets so far discovered, in terms of physical size, ordered by radius. Limitations This list of extrasolar objects may and will change over time due to diverging measurements published between scientific jou ...
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List of exoplanet extremes The following are lists of extremes among the known exoplanet An exoplanet or extrasolar planet is a planet outside the Solar System. The first confirmed detection of an exoplanet was in 1992 around a pulsar, and the first detection around ...
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Lists of exoplanets A list is a set of discrete items of information collected and set forth in some format for utility, entertainment, or other purposes. A list may be memorialized in any number of ways, including existing only in the mind of the list-maker, but ...


References

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NASA Exoplanet Archive The NASA Exoplanet Archive is an online astronomical exoplanet catalog and data service that collects and serves public data that support the search for and characterization of extra-solar planets (exoplanets) and their host stars. It is part of ...
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{{cite journal , last1=Gaidos , first1=Eric , last2=Mann , first2=Andrew W. , last3=Ansdell , first3=Megan , date=January 2016 , title=The Enigmatic and Ephemeral M Dwarf System KOI 6705: Cheshire Cat or Wild Goose? , journal=
The Astrophysical Journal ''The Astrophysical Journal'' (''ApJ'') is a peer-reviewed scientific journal of astrophysics and astronomy, established in 1895 by American astronomers George Ellery Hale and James Edward Keeler. The journal discontinued its print edition and ...
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Monthly Notices of the Royal Astronomical Society ''Monthly Notices of the Royal Astronomical Society'' (MNRAS) is a peer-reviewed scientific journal in astronomy, astrophysics and related fields. It publishes original research in two formats: papers (of any length) and letters (limited to ...
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The Astrophysical Journal ''The Astrophysical Journal'' (''ApJ'') is a peer-reviewed scientific journal of astrophysics and astronomy, established in 1895 by American astronomers George Ellery Hale and James Edward Keeler. The journal discontinued its print edition and ...
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{{cite journal , last1=Adams , first1=Elisabeth R. , last2=Jackson , first2=Brian , display-authors=etal , date=August 2021 , title=Ultra-short-period Planets in K2. III. Neighbors are Common with 13 New Multiplanet Systems and 10 Newly Validated Planets in Campaigns 0-8 and 10 , journal=
The Planetary Science Journal ''The Planetary Science Journal'' is a peer-reviewed open access scientific journal of astrophysics and astronomy, established in 2020. It is published by IOP Publishing on behalf of the American Astronomical Society. The founding editor-in-chief i ...
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{{cite journal , last1=Piaulet , first1=Caroline , last2=Benneke , first2=Björn , display-authors=etal , date=15 December 2022 , title=Evidence for the volatile-rich composition of a 1.5-Earth-radius planet , journal=
Nature Astronomy ''Nature Astronomy'' is a peer reviewed scientific journal published by Nature Portfolio. It was first published in January 2017 (volume 1, issue 1), although the first content appeared online in December 2016. The editor-in-chief is Paul Woods, w ...
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{{cite journal , last1=Bonomo , first1=A. S. , last2=Dumusque , first2=X. , display-authors=etal , date=September 2023 , title=Cold Jupiters and improved masses in 38 Kepler and K2 small planet systems from 3661 HARPS-N radial velocities. No excess of cold Jupiters in small planet systems , journal=
Astronomy & Astrophysics ''Astronomy & Astrophysics (A&A)'' is a monthly peer-reviewed scientific journal covering theoretical, observational, and instrumental astronomy and astrophysics. It is operated by an editorial team under the supervision of a board of directors re ...
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{{cite journal , last1=Goffo , first1=Elisa , last2=Gandolfi , first2=Davide , display-authors=etal , date=September 2023 , title=Company for the ultra-high density, ultra-short period sub-Earth GJ 367 b: discovery of two additional low-mass planets at 11.5 and 34 days , journal=
The Astrophysical Journal Letters ''The Astrophysical Journal'' (''ApJ'') is a peer-reviewed scientific journal of astrophysics and astronomy, established in 1895 by American astronomers George Ellery Hale and James Edward Keeler. The journal discontinued its print edition and b ...
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{{Cite journal, author=Manser, Christopher J., display-authors=etal, title=A planetesimal orbiting within the debris disc around a white dwarf star, date=5 April 2019, journal=Science, volume=364, issue=6435, pages=66–69, url=https://www.science.org/doi/10.1126/science.aat5330, bibcode=2019Sci...364...66M, doi=10.1126/science.aat5330, pmid=30948547 , arxiv=1904.02163, hdl=1887/85061 , s2cid=96434522, issn=0036-8075 {{cite journal , title=The Kepler Giant Planet Search. I. A Decade of Kepler Planet-host Radial Velocities from W. M. Keck Observatory , last1=Weiss , first1=Lauren M. , last2=Isaacson , first2=Howard , last3=Howard , first3=Andrew W. , last4=Fulton , first4=Benjamin J. , last5=Petigura , first5=Erik A. , last6=Fabrycky , first6=Daniel , last7=Jontof-Hutter , first7=Daniel , last8=Steffen , first8=Jason H. , last9=Schlichting , first9=Hilke E. , last10=Wright , first10=Jason T. , last11=Beard , first11=Corey , last12=Brinkman , first12=Casey L. , last13=Chontos , first13=Ashley , last14=Giacalone , first14=Steven , last15=Hill , first15=Michelle L. , last16=Kosiarek , first16=Molly R. , last17=MacDougall , first17=Mason G. , last18=Močnik , first18=Teo , last19=Polanski , first19=Alex S. , last20=Turtelboom , first20=Emma V. , last21=Tyler , first21=Dakotah , last22=Van Zandt , first22=Judah , display-authors=1 , journal=The Astrophysical Journal Supplement Series , volume=270 , issue=1 , date=2024-01-01 , article-number=8 , page= , arxiv=2304.00071 , bibcode=2024ApJS..270....8W , bibcode-access=free , doi=10.3847/1538-4365/ad0cab , doi-access=free {{cite journal , last1=Silverstein , first1=Michele L. , last2=Barclay , first2=Thomas , display-authors=etal , date=May 2024 , title=Validation of a Third Planet in the LHS 1678 System , journal=
The Astronomical Journal ''The Astronomical Journal'' (often abbreviated ''AJ'' in scientific papers and references) is a peer-reviewed monthly scientific journal owned by the American Astronomical Society (AAS) and currently published by IOP Publishing. It is one of the p ...
, volume=167 , issue=6 , pages=255 , doi=10.3847/1538-3881/ad3040 , doi-access=free , arxiv=2403.00110 , bibcode=2024AJ....167..255S
{{cite journal , last1=Tey , first1=Evan , last2=Shporer , first2=Avi , display-authors=etal , date=May 2024 , title=GJ 238 b: A 0.57 Earth Radius Planet Orbiting an M2.5 Dwarf Star at 15.2 pc , journal=
The Astronomical Journal ''The Astronomical Journal'' (often abbreviated ''AJ'' in scientific papers and references) is a peer-reviewed monthly scientific journal owned by the American Astronomical Society (AAS) and currently published by IOP Publishing. It is one of the p ...
, volume=167 , issue=6 , pages=283 , doi=10.3847/1538-3881/ad3df1 , doi-access=free , arxiv=2407.18199 , bibcode=2024AJ....167..283T
{{cite journal , last1=Wang , first1=Kaitlyn , last2=Ge , first2=Jian , display-authors=etal , date=November 2024 , title=Discovery of small ultra-short-period planets orbiting Kepler KG dwarfs with GPU phase folding and deep learning , journal=
Monthly Notices of the Royal Astronomical Society ''Monthly Notices of the Royal Astronomical Society'' (MNRAS) is a peer-reviewed scientific journal in astronomy, astrophysics and related fields. It publishes original research in two formats: papers (of any length) and letters (limited to ...
, volume=534 , issue=3 , pages=1913–1927 , doi=10.1093/mnras/stae2155 , doi-access=free , arxiv=2312.17382 , bibcode=2024MNRAS.534.1913W
{{cite journal , last1=Basant , first1=Ritvik , last2=Luque , first2=Rafael , display-authors=etal , date=March 2025 , title=Four Sub-Earth Planets Orbiting Barnard's Star from MAROON-X and ESPRESSO , journal=
The Astrophysical Journal Letters ''The Astrophysical Journal'' (''ApJ'') is a peer-reviewed scientific journal of astrophysics and astronomy, established in 1895 by American astronomers George Ellery Hale and James Edward Keeler. The journal discontinued its print edition and b ...
, volume=982 , issue= 1, pages=L1 , doi=10.3847/2041-8213/adb8d5 , doi-access=free , arxiv=2503.08095, bibcode=2025ApJ...982L...1B
Lists of exoplanets E *