# Exoasteroid

> Mediated Wiki article. Canonical URL: https://mediated.wiki/source/Exoasteroid
> Markdown URL: https://mediated.wiki/source/Exoasteroid.md
> Source: https://en.wikipedia.org/wiki/Exoasteroid
> Source revision: 1349046551
> License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/)

Asteroids found outside of the Solar System

Exoasteroid belts around [Fomalhaut](/source/Fomalhaut)
([James Webb Space Telescope](/source/James_Webb_Space_Telescope); 8 May 2023)

An **exoasteroid**, **exo-asteroid**, or **extrasolar asteroid**, is an [asteroid](/source/Asteroid) located outside the [Solar System](/source/Solar_System).[1]

## Evidence

Scientists suggest that exoasteroids may form through the fragmentation of [exoplanets](/source/Exoplanet) caused by interactions with [gas giants](/source/Gas_giant). These exoasteroids are presumed to be the remnants of smaller celestial bodies that survived the destruction of their parent exoplanet. Similar processes are believed to have occurred during the early [formation of the Solar System](/source/Formation_and_evolution_of_the_Solar_System).[2][3]

NASA has conducted studies in which simulations indicate that [asteroid belts](/source/Asteroid_belt) are likely to be a common feature around stars in planetary systems containing planets comparable in size to the inner and outer planets of the Solar System.[3]

## History

In December 1988, American [astrophysicists](/source/Astrophysicist) [Benjamin Zuckerman](/source/Benjamin_Zuckerman) and [Eric Becklin](/source/Eric_Becklin) identified a substantial [circumstellar disc](/source/Circumstellar_disc) encircling the [white dwarf](/source/White_dwarf) star [G 29-38](/source/G_29-38), discovered from a [near-infrared](/source/Near-infrared) survey of 200 white dwarfs.[4] Follow-up observations by Zuckerman and Becklin showed that the circumstellar disc emits significant radiation within the 2 to 5 [micrometer](/source/Micrometre) range, indicating possible interactions between exoasteroids and surrounding material, which may result in their ejection into space.[5] Later observations with the [Spitzer Space Telescope](/source/Spitzer_Space_Telescope) in 2004 detected a dust cloud around G 29-38, thought to have formed from the disintegration of an [exocomet](/source/Exocomet) or exoasteroid interacting with the white dwarf.[6]

In May 2023, the [James Webb Space Telescope](/source/James_Webb_Space_Telescope) captured images of [Fomalhaut](/source/Fomalhaut),[7] a young star located 25 [light-years](/source/Light-year) (ly) from Earth. Analysis of these images, combined with simulations and testing of the star's asteroid belt, suggests that the belt likely formed through collisions among larger celestial bodies.[7][*[clarification needed](https://en.wikipedia.org/wiki/Wikipedia:Please_clarify)*]

Another notable star hosting an asteroid belt is the white dwarf star [WD 0145+234](/source/WD_0145%2B234). It is hypothesized that the star previously hosted an exoasteroid or exoplanet, whose disruption led to the formation of a substantial exoasteroid belt. Given the star's dimensions, scientists infer that its accretion disk is highly active, regularly disrupting exoasteroids through gravitational interactions. In 2018, astronomers observed a 10% increase in the star's [mid-infrared](/source/Mid-infrared) emission, consistent with the recent destruction of an exoasteroid and the resulting formation of a cloud of metallic dust partially obscuring WD 0145+234 from Earth.[8]

## Detection

Artist's concept of an exoasteroid being disrupted by its star

In 2013, astronomers discovered fragmented remnants of an exoasteroid orbiting the star [GD 61](/source/GD_61). Analysis revealed that the asteroid's surface was approximately 26% water by mass, similar to the ice found on the dwarf planet [Ceres](/source/Ceres_(dwarf_planet)). This discovery suggests that a planet with liquid water may once have existed around the star. The asteroid is thought to have been disrupted by interactions with its host star, resulting in its fragmentation and the formation of an asteroid belt.[9]

Subsequent observations using the [Cosmic Origins Spectrograph](/source/Cosmic_Origins_Spectrograph) on the [Hubble Space Telescope](/source/Hubble_Space_Telescope) identified [magnesium](/source/Magnesium), [silicon](/source/Silicon), [iron](/source/Iron), and [oxygen](/source/Oxygen) within the asteroid's water.[9]

## See also

- [Accretion disk](/source/Accretion_disk)

- [Circumstellar disc](/source/Circumstellar_disc)

- [Debris disk](/source/Debris_disk)

- [Disrupted planet](/source/Disrupted_planet)

- [List of exceptional asteroids](/source/List_of_exceptional_asteroids)

- [Lost minor planet](/source/Lost_minor_planet)

- [Protoplanetary disk](/source/Protoplanetary_disk)

## References

1. **[^](#cite_ref-SM-20230511_1-0)** Enking, Molly (11 May 2023). ["James Webb Telescope Reveals Asteroid Belts Around Nearby Young Star - The findings suggest the star Fomalhaut may have orbiting planets hidden among its rings of debris"](https://www.smithsonianmag.com/smart-news/james-webb-telescope-reveals-asteroid-belts-around-nearby-young-star-180982148). *Smithsonian*. Retrieved 31 December 2023.{{[cite news](https://en.wikipedia.org/wiki/Template:Cite_news)}}: CS1 maint: deprecated archival service ([link](https://en.wikipedia.org/wiki/Category:CS1_maint:_deprecated_archival_service))

1. **[^](#cite_ref-2)** ["Asteroids: Facts"](https://science.nasa.gov/solar-system/asteroids/facts/). *NASA*. 14 November 2017. Retrieved 31 December 2023.

1. ^ [***a***](#cite_ref-NASA-20230126_3-0) [***b***](#cite_ref-NASA-20230126_3-1) Gronstal, Aaron (26 January 2023). ["Exo-Asteroids and Habitability around M-Dwarfs"](https://astrobiology.nasa.gov/news/exo-asteroids-and-habitability-around-m-dwarfs/). *NASA*. Retrieved 31 December 2023.{{[cite news](https://en.wikipedia.org/wiki/Template:Cite_news)}}: CS1 maint: deprecated archival service ([link](https://en.wikipedia.org/wiki/Category:CS1_maint:_deprecated_archival_service))

1. **[^](#cite_ref-BZ1_4-0)** [A low-temperature companion to a white dwarf star](http://adsabs.harvard.edu/abs/1988Natur.336..656B), E. E. Becklin & B. Zuckerman, *Nature* **336** (Dec. 15, 1988), pp. 656-658

1. **[^](#cite_ref-5)** [Excess infrared radiation from a white dwarf - an orbiting brown dwarf?](http://adsabs.harvard.edu/abs/1987Natur.330..138Z) B. Zuckerman & E. E. Becklin, *Nature* **330**, (Nov. 12, 1987), pp. 138-140

1. **[^](#cite_ref-6)** [The Dust Cloud around the White Dwarf G29-38](http://adsabs.harvard.edu/abs/2005ApJ...635L.161R), William T. Reach, Marc J. Kuchner, Ted von Hippel, Adam Burrows, Fergal Mullally, Mukremin Kilic, and D. E. Winget, *Astrophysical Journal* **635**, #2 (December 2005), pp. L161–L164.

1. ^ [***a***](#cite_ref-:0_7-0) [***b***](#cite_ref-:0_7-1) ["Webb Looks for Fomalhaut's Asteroid Belt and Finds Much More"](https://www.nasa.gov/missions/webb/webb-looks-for-fomalhauts-asteroid-belt-and-finds-much-more/). *NASA*. 8 May 2023. Retrieved 30 December 2023.

1. **[^](#cite_ref-8)** Letzter, Rafi (17 October 2019). ["An Asteroid-Smashing Star Ground a Giant Rock to Bits and Covered Itself in the Remains"](https://www.livescience.com/white-dwarf-asteroid-smasher.html). *Live Science*. Retrieved 31 December 2023.

1. ^ [***a***](#cite_ref-phys2013_9-0) [***b***](#cite_ref-phys2013_9-1) ["Watery asteroid discovered in dying star points to habitable exoplanets"](https://phys.org/news/2013-10-watery-asteroid-dying-star-habitable.html). *Phys.org*. 10 October 2013. Retrieved 31 December 2023.

## External links

Look up ***[exoasteroid](https://en.wiktionary.org/wiki/Special:Search/exoasteroid)*** in Wiktionary, the free dictionary.

- ["Alphabetical list of minor planet names"](http://www.minorplanetcenter.org/iau/lists/MPNames.html). Minor Planet Center. International Astronomical Union.

- ["Asteroid articles in Planetary Science Research Discoveries"](http://www.psrd.hawaii.edu/Archive/Archive-Asteroids.html). Planetary Science. University of Hawaii.

- ["JPL Asteroid Watch site"](https://www.jpl.nasa.gov/asteroidwatch/). [Jet Propulsion Laboratory](/source/Jet_Propulsion_Laboratory).

- [NASA Asteroid and Comet Watch site](https://www.nasa.gov/asteroid-and-comet-watch)

- [Asteroid size comparisons (video; 2:40)](https://www.youtube.com/watch?v=bSkPNMjRRio) on [YouTube](/source/YouTube_video_(identifier))

v t e Asteroids Main Notable asteroids Physical characteristics dynamic method Impact avoidance Tracking Gravitational keyhole Earth-crosser Close approaches Binary moon contact Active Asteroid pair Palomar–Leiden survey Contact binary Dark comet Distribution Trojans Venus trojan Earth trojans Mars trojans Jupiter trojans Saturn trojan Uranus trojans Neptune trojans Interior to Earth Vulcanoids Mercury-crossers Venus-crossers Near-Earth Aten Amor Apollo Atira Earth-crossers Between Earth and the main belt Mars crossers Asteroid belt Kirkwood gap Active asteroids Outer Solar System, does not include distant minor planets Jupiter-crossers Saturn-crossers Uranus-crossers Neptune-crossers Centaurs Exoasteroids Classification Orbital Group Family (list) Spectral Tholen C-group B-type F-type G-type C-type S-type X-group M-type E-type P-type small classes A-type D-type J-type T-type Q-type R-type V-type SMASS C-group B-type C-type Cg Ch Cgh Cb S-group A-type Q-type R-type K-type L-type S-type Sa Sq Sr Sk Sl X-group X-type Xe Xc Xk small types T-type D-type Ld-type O-type V-type Exploration Asteroids visited by spacecraft Mining Capture Colonization Lists Minor planets Lost Discovering observatories Space missions Related Asteroid Day Asteroids in fiction Asteroids in astrology Occultations by asteroids Comet Minor planet Category

Articles related to Asteroids v t e Ceres Exosphere Geology Geography (Features) Craters Abellio Achita Annona Coniraya Consus Dantu Ezinu Fejokoo Haulani Ikapati Kerwan Nawish Occator Oxo Sintana Tupo Urvara Victa Yalode Mountains Ahuna Mons Liberalia Mons Yamor Mons Other features Samhain Catenae Bright spots Astronomy Classification Asteroid Definition of planet Dwarf planet Planet 2006 definition of planet Discovery Barnaba Oriani Carl Friedrich Gauss Francis Wollaston Franz Xaver von Zach Giuseppe Piazzi Heinrich Olbers Jérôme Lalande Johann Elert Bode Tobias Mayer Possible trojans and co-orbitals (185105) 2006 SV23 1372 Haremari (76146) 2000 EU16 Exploration Dawn mission Ceres Polar Lander (proposed) Calathus Mission (proposed) Related Colonization In astrology Solar System bodies formerly considered to be planets v t e Comets Features Nucleus Coma Tails Antitail Comet dust Meteor shower Types Periodic Numbered Lost Long period Halley-type Jupiter-family Encke-type Main-belt Non-periodic Near-parabolic Hyperbolic Unknown-orbit Great Comet Sungrazing (Kreutz) Extinct Exocomet Interstellar Dark comet Related Naming of comets Observational history of comets Centaur Comet discoverers LINEAR Extraterrestrial atmosphere Oort cloud Small Solar System body Asteroid Exploration List of missions to comets List of comets visited by spacecraft Latest C/2026 A1 (MAPS) C/2025 R3 (PanSTARRS) C/2025 R2 (SWAN) 3I/ATLAS C/2025 F2 (SWAN) C/2025 A6 (Lemmon) C/2024 S1 (ATLAS) C/2024 G3 (ATLAS) C/2024 E1 (Wierzchoś) C/2023 P1 (Nishimura) C/2023 H2 (Lemmon) C/2023 E1 (ATLAS) C/2023 A3 (Tsuchinshan–ATLAS) C/2022 E3 (ZTF) C/2021 O3 (PanSTARRS) C/2021 J1 (Maury–Attard) C/2021 A1 (Leonard) C/2020 S3 (Erasmus) C/2020 X3 (SOHO) C/2020 F8 (SWAN) C/2020 F5 (MASTER) C/2020 F3 (NEOWISE) C/2019 Y4 (ATLAS) C/2019 Y1 (ATLAS) C/2019 U6 (Lemmon) 2I/Borisov P/2019 LD2 (ATLAS) Culture and speculation Antimatter comet Comets in fiction Comet vintages Lists of comets (more) Periodic comets Until 1985 (all) 1P/Halley 2P/Encke 3D/Biela 4P/Faye 5D/Brorsen 6P/d'Arrest 7P/Pons–Winnecke 8P/Tuttle 9P/Tempel 10P/Tempel 11P/Tempel–Swift–LINEAR 12P/Pons–Brooks 13P/Olbers 14P/Wolf 15P/Finlay 16P/Brooks 17P/Holmes 18D/Perrine–Mrkos 19P/Borrelly 20D/Westphal 21P/Giacobini–Zinner 22P/Kopff 23P/Brorsen–Metcalf 24P/Schaumasse 25D/Neujmin 26P/Grigg–Skjellerup 27P/Crommelin 28P/Neujmin 29P/Schwassmann–Wachmann 30P/Reinmuth 31P/Schwassmann–Wachmann 32P/Comas Solà 33P/Daniel 34D/Gale 35P/Herschel–Rigollet 36P/Whipple 37P/Forbes 38P/Stephan–Oterma 39P/Oterma 40P/Väisälä 41P/Tuttle–Giacobini–Kresák 42P/Neujmin 43P/Wolf–Harrington 44P/Reinmuth 45P/Honda–Mrkos–Pajdušáková 46P/Wirtanen 47P/Ashbrook–Jackson 48P/Johnson 49P/Arend–Rigaux 50P/Arend 51P/Harrington 52P/Harrington–Abell 53P/Van Biesbroeck 54P/de Vico–Swift–NEAT 55P/Tempel–Tuttle 56P/Slaughter–Burnham 57P/du Toit–Neujmin–Delporte 58P/Jackson–Neujmin 59P/Kearns–Kwee 60P/Tsuchinshan 61P/Shajn–Schaldach 62P/Tsuchinshan 63P/Wild 64P/Swift–Gehrels 65P/Gunn 66P/du Toit 67P/Churyumov–Gerasimenko 68P/Klemola 69P/Taylor 70P/Kojima 71P/Clark 72P/Denning–Fujikawa 73P/Schwassmann–Wachmann 74P/Smirnova–Chernykh 75D/Kohoutek 76P/West–Kohoutek–Ikemura 77P/Longmore 78P/Gehrels 79P/du Toit–Hartley 80P/Peters–Hartley 81P/Wild 82P/Gehrels 83D/Russell 84P/Giclas 85D/Boethin After 1985 (notable) 88P/Howell 92P/Sanguin 96P/Machholz 97P/Metcalf–Brewington 103P/Hartley 107P/Wilson–Harrington 108P/Ciffréo 109P/Swift–Tuttle 122P/de Vico 126P/IRAS 141P/Machholz 144P/Kushida 147P/Kushida–Muramatsu 153P/Ikeya–Zhang 156P/Russell–LINEAR 161P/Hartley–IRAS 162P/Siding Spring 168P/Hergenrother 169P/NEAT 177P/Barnard 178P/Hug–Bell 205P/Giacobini 209P/LINEAR 238P/Read 246P/NEAT 249P/LINEAR 252P/LINEAR 255P/Levy 273P/Pons–Gambart 289P/Blanpain 311P/PanSTARRS 322P/SOHO 323P/SOHO 332P/Ikeya–Murakami 333P/LINEAR 354P/LINEAR 362P 460P/PanSTARRS Comet-like asteroids 596 Scheila 2060 Chiron (95P) 4015 Wilson–Harrington (107P) 7968 Elst–Pizarro (133P) 165P/LINEAR 166P/NEAT 167P/CINEOS 60558 Echeclus (174P) 118401 LINEAR (176P) 238P/Read 259P/Garradd 311P/PanSTARRS 324P/La Sagra 331P/Gibbs 354P/LINEAR 358P/PANSTARRS P/2013 R3 (Catalina-PANSTARRS) (300163) 2006 VW139 Lost Recovered 9P/Tempel 11P/Tempel–Swift–LINEAR 15P/Finlay 17P/Holmes 27P/Crommelin 54P/de Vico–Swift–NEAT 55P/Tempel–Tuttle 57P/du Toit–Neujmin–Delporte 69P/Taylor 72P/Denning–Fujikawa 80P/Peters–Hartley 97P/Metcalf–Brewington 107P/Wilson–Harrington 113P/Spitaler 122P/de Vico 157P/Tritton 205P/Giacobini 206P/Barnard–Boattini 226P/Pigott–LINEAR–Kowalski 271P/van Houten–Lemmon 289P/Blanpain 489P/Denning Destroyed 3D/Biela D/1993 F2 (Shoemaker–Levy 9) Not found D/1770 L1 (Lexell) 5D/Brorsen 18D/Perrine–Mrkos 20D/Westphal 25D/Neujmin 34D/Gale 75D/Kohoutek 83D/Russell 85D/Boethin D/1978 R1 (Haneda–Campos) Visited by spacecraft 21P/Giacobini–Zinner (1985) 1P/Halley (1986) 26P/Grigg–Skjellerup (1992) 19P/Borrelly (2001) 81P/Wild (2004) 9P/Tempel (2005, 2011) C/2006 P1 (2007) 103P/Hartley (2010) 67P/Churyumov–Gerasimenko (2014) Near-Parabolic comets (notable) Until 1990 C/-43 K1 (Caesar's Comet) X/1106 C1 (Great Comet of 1106) C/1264 N1 (Great Comet of 1264) C/1402 D1 (Great Comet of 1402) C/1471 Y1 (Great Comet of 1472) C/1577 V1 (Great Comet of 1577) C/1652 Y1 C/1680 V1 (Great Comet of 1680, Kirsch's Comet, Newton's Comet)) C/1702 H1 (Comet of 1702) C/1729 P1 (Comet of 1729, Comet Sarabat) C/1739 K1 (Zanotti) C/1743 X1 (Great Comet of 1744, Comet Klinkenberg-Chéseaux) C/1760 A1 (Great Comet of 1760) C/1769 P1 (Great Comet of 1769) C/1807 R1 (Great Comet of 1807) C/1811 F1 (Great Comet of 1811) C/1819 N1 (Great Comet of 1819) C/1823 Y1 (Great Comet of 1823) C/1843 D1 (Great March Comet of 1843) C/1846 J1 (Brorsen) C/1847 T1 (Miss Mitchell's Comet) C/1852 K1 (Chacornac) C/1853 G1 (Schweizer) C/1858 L1 (Comet Donati) C/1861 G1 (Comet Thatcher) C/1861 J1 (Great Comet of 1861) C/1862 N1 (Schmidt) C/1864 N1 (Tempel) C/1865 B1 (Great Southern Comet of 1865) X/1872 X1 (Pogson's Comet) C/1874 H1 (Comet Coggia) C/1881 K1 (Comet Tebbutt) C/1882 R1 (Great Comet of 1882) C/1887 B1 (Great Southern Comet of 1887) C/1893 U1 (Brooks) C/1901 G1 (Great Comet of 1901) C/1907 G1 (Grigg–Mellish) C/1910 A1 (Great January Comet of 1910) C/1911 N1 (Kiess) C/1911 O1 (Brooks) C/1911 S3 (Beljawsky) C/1915 C1 (Mellish) C/1917 F1 (Mellish) C/1927 X1 (Skjellerup–Maristany) C/1931 P1 (Ryves) C/1936 O1 (Kaho–Kozik–Lis) C/1939 H1 (Jurlof–Achmarof–Hassel) C/1941 B2 (de Kock-Paraskevopoulos) C/1947 X1 (Southern Comet) C/1948 L1 (Honda–Bernasconi) C/1948 V1 (Eclipse) C/1956 R1 (Arend–Roland) C/1957 P1 (Mrkos) C/1961 O1 (Wilson-Hubbard) C/1961 R1 (Humason) C/1961 T1 (Seki) C/1962 C1 (Seki-Lines) C/1963 A1 (Ikeya) C/1963 R1 (Pereyra) C/1964 N1 (Ikeya) C/1965 S1 (Ikeya-Seki) C/1969 T1 (Tago-Sato-Kosaka) C/1969 Y1 (Bennett) C/1970 K1 (White–Ortiz–Bolelli) C/1973 E1 (Kohoutek) C/1975 T2 (Suzuki–Saigusa–Mori) C/1975 V1 (West) C/1979 Y1 (Bradfield) C/1980 E1 (Bowell) C/1983 H1 (IRAS–Araki–Alcock) C/1983 J1 (Sugano–Saigusa–Fujikawa) C/1989 W1 (Aarseth-Brewington) C/1989 X1 (Austin) C/1989 Y1 (Skorichenko–George) After 1990 C/1990 K1 (Levy) C/1992 J1 (Spacewatch–Rabinowitz) C/1993 Y1 (McNaught–Russell) C/1995 O1 (Hale–Bopp) C/1996 B2 (Hyakutake) C/1997 L1 (Zhu–Balam) C/1998 H1 (Stonehouse) C/1998 J1 (SOHO) C/1999 F1 (Catalina) C/1999 H1 (Lee) C/1999 S4 (LINEAR) C/2000 WM1 (LINEAR) C/2001 A2 (LINEAR) C/2001 OG108 (LONEOS) C/2001 Q4 (NEAT) C/2002 T7 (LINEAR) C/2002 V1 (NEAT) C/2004 F4 (Bradfield) C/2004 Q2 (Machholz) C/2006 A1 (Pojmański) C/2006 M4 (SWAN) C/2006 P1 (McNaught) C/2007 E2 (Lovejoy) C/2007 F1 (LONEOS) C/2007 N3 (Lulin) C/2007 Q3 (Siding Spring) C/2007 W1 (Boattini) C/2009 F6 (Yi–SWAN) C/2009 R1 (McNaught) C/2010 X1 (Elenin) C/2011 L4 (PANSTARRS) C/2011 W3 (Lovejoy) C/2012 E2 (SWAN) C/2012 F6 (Lemmon) C/2012 K1 (PANSTARRS) C/2012 S1 (ISON) C/2013 A1 (Siding Spring) C/2013 R1 (Lovejoy) C/2013 US10 (Catalina) C/2013 V5 (Oukaimeden) C/2014 E2 (Jacques) C/2014 Q1 (PanSTARRS) C/2014 Q2 (Lovejoy) C/2014 UN271 (Bernardinelli–Bernstein) C/2015 ER61 (PanSTARRS) C/2015 V2 (Johnson) C/2017 K2 (PanSTARRS) 1I/2017 U1 ʻOumuamua C/2018 Y1 (Iwamoto) 2I/Borisov C/2019 U6 (Lemmon) C/2019 Y4 (ATLAS) C/2020 F3 (NEOWISE) C/2020 F8 (SWAN) C/2021 A1 (Leonard) C/2022 E3 (ZTF) C/2023 A3 (Tsuchinshan–ATLAS) C/2023 P1 (Nishimura) C/2024 G3 (ATLAS) C/2024 S1 (ATLAS) C/2025 A6 (Lemmon) C/2025 D1 (Gröller) After 1910 (by name) Aarseth–Brewington Arend–Roland ATLAS C/2019 Y4 C/2024 G3 C/2024 S1 3I Austin Beljawsky Bennett Bernardinelli–Bernstein Boattini Borisov Bowell Bradfield C/1979 Y1 C/2004 F4 Brooks Catalina C/1999 F1 C/2013 US10 de Kock–Paraskevopoulos Eclipse Elenin Gröller Hale-Bopp Honda–Bernasconi Humason Hyakutake Ikeya C/1963 A1 C/1964 N1 Ikeya-Seki IRAS–Araki–Alcock ISON Iwamoto Jacques Johnson Jurlof–Achmarof–Hassel Kaho–Kozik–Lis Kiess Kohoutek Lee Lemmon C/2012 F6 C/2019 U6 C/2025 A6 Leonard Levy LINEAR C/1999 S4 C/2000 WM1 C/2001 A2 C/2002 T7 LONEOS C/2001 OG108 C/2007 F1 Lovejoy C/2007 E2 C/2011 W3 C/2013 R1 C/2014 Q2 Lulin Machholz McNaught C/2006 P1 C/2009 R1 McNaught–Russell Mellish C/1915 C1 C/1917 F1 Mrkos NEAT C/2001 Q4 C/2002 V1 NEOWISE Nishimura Oukaimeden ʻOumuamua Pan-STARRS C/2011 L4 C/2012 K1 311P/PanSTARRS C/2014 Q1 C/2015 ER61 C/2017 K2 Pereyra Pojmański Ryves Seki Seki–Lines Siding Spring C/2007 Q3 C/2013 A1 Skjellerup–Maristany Skorichenko–George SOHO Solwind Southern Spacewatch Stonehouse Sugano–Saigusa–Fujikawa Suzuki–Saigusa–Mori SWAN C/2006 M4 C/2020 F8 Tago–Sato–Kosaka Tsuchinshan–ATLAS West White–Ortiz–Bolelli Wilson–Hubbard Yi–SWAN Zhu–Balam ZTF Category v t e Solar System Sun Mercury Venus Earth Mars Ceres Jupiter Saturn Uranus Neptune Orcus Pluto Haumea Quaoar Makemake Gonggong Eris Sedna Planets, dwarfs, minors Terrestrials Mercury Venus Earth Mars Giants Gas Jupiter Saturn Ice Uranus Neptune Dwarfs Ceres Orcus Pluto Haumea Quaoar Makemake Gonggong Eris Sedna Large Minor Planets Vesta Pallas Salacia Máni Achlys Aya Chiminigagua Varda Ixion List Moons Earth Moon claimed Mars Phobos Deimos Jupiter Ganymede Callisto Io Europa all 115 Saturn Titan Rhea Iapetus Dione Tethys Enceladus Mimas Hyperion Phoebe all 293 Uranus Titania Oberon Umbriel Ariel Miranda all 29 Neptune Triton Proteus Nereid all 16 Pluto Charon Nix Hydra Kerberos Styx Orcus Vanth Haumea Hiʻiaka Namaka Quaoar Weywot Makemake S/2015 (136472) 1 Gonggong Xiangliu Eris Dysnomia Exploration (outline) Colonization Discovery astronomy historical models timeline Space probes timeline list Human spaceflight space stations list programs Mercury Venus Moon mining Mars Ceres Asteroids mining Comets Jupiter Saturn Uranus Neptune Pluto Deep space Hypothetical objects Bagby's moon Chiron Coatlicue Counter-Earth Chrysalis Fifth Giant Hyperion Lilith Mercury's moon Neith Nemesis Nibiru Petit's moon Phaeton Planet Nine Effects Planet Ten Planet V Planet X Subsatellites Synestia Theia Themis Tyche Vulcan Vulcanoids Waltemath's moons Lists Comets Possible dwarf planets Gravitationally rounded objects Minor planets Natural satellites Solar System models Solar System objects by size by discovery date Interstellar and circumstellar molecules Rings Planetary Terran Jovian Saturnian (Rhean?) Uranian Neptunian Minor objects' Charikloan Chironean Haumean Quaoarian Formation, evolution, contents, and History Star formation Accretion Accretion disk Excretion Capture theory Capture of Triton Circumplanetary disk Circumstellar disc Circumstellar envelope Coatlicue Co-orbital configuration Trojan moons Co-orbital moons Cosmic dust Debris disk Detached object Disk instability EXCEDE Exozodiacal dust Extraterrestrial materials Curation Sample-return mission Frost/Ice/Snow line Giant-impact hypothesis Grand tack hypothesis Gravitational collapse Hills cloud Hill sphere Interplanetary dust cloud Interplanetary medium/space Interstellar cloud Interstellar medium Interstellar space Kuiper belt Kuiper cliff Late Heavy Bombardment Molecular cloud Nebular hypothesis Nice model Nice 2 model Five-planet Nice model Oort cloud Oort limit Outer space Planet Disrupted Migration System Planetesimal Formation Merging stars Protoplanetary disk Ring system Roche limit vs. Hill sphere Rubble pile Scattered disc Small Solar System bodies Asteroid belt Asteroids Ceres Vesta Pallas Hygiea active List families PHA exceptional Kirkwood gap Centaurs Comets Damocloids Meteoroids Minor planets names and meanings moons Planetesimal Planetary orbit-crossers Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune Trojans Venus Earth Mars Jupiter Trojan camp Greek camp Saturn Uranus Neptune Near-Earth objects NEAs Trans-Neptunian objects Kuiper belt Cubewanos Plutinos Detached objects Sednoids Scattered disc Hills cloud Oort cloud Oort limit Related Double planet Lagrange point Moonlet Syzygy Tidal locking Outline of the Solar System Solar System portal Astronomy portal Earth sciences portal Solar System → Local Interstellar Cloud → Local Bubble → Gould Belt → Orion Arm → Milky Way → Milky Way subgroup → Local Group → Local Sheet → Local Volume → Virgo Supercluster → Laniakea Supercluster → Pisces–Cetus Supercluster Complex → Local Hole → Observable universe → Universe Each arrow (→) may be read as "within" or "part of". v t e Small Solar System bodies Minor planets Designation Groups List Moon Meanings of names Asteroid Active Asteroid belt Family Jupiter trojan Near-Earth Amors Apollos Atens Atiras Spectral types Distant minor planet Centaur Neptune trojan Damocloid Trans-Neptunian object Detached Kuiper belt Oort cloud Scattered disc Comets Extinct Great Halley-type Hyperbolic/Parabolic Long-period Lost Near-parabolic Periodic Sungrazing Other Cosmic dust Meteoroids Space debris v t e Spacecraft missions to minor planets and comets List of minor planets and comets visited by spacecraft List of artificial objects on extraterrestrial surfaces Active New Horizons (multiple flybys) OSIRIS-APEX (orbiter) Hayabusa2♯ (lander) Lucy (multiple flybys) Psyche (orbiter) Hera (orbiter) AIDA Tianwen-2 (multiple flybys and sample return) Past Flybys Cassini–Huygens Chang'e 2 Clementine† CONTOUR† Deep Impact EPOXI Deep Space 1 Galileo Halley Armada Giotto Sakigake Suisei Vega 1 Vega 2 International Cometary Explorer LICIACube NEA Scout† NEAR Shoemaker Pioneer 7 PROCYON† Rosetta Stardust Ulysses Orbiters Dawn NEAR Shoemaker Rosetta Timeline Landers Hayabusa MINERVA† Hayabusa2 MASCOT Rover-1A / HIBOU Rover-1B / OWL Rover-2† NEAR Shoemaker Philae Impactors Deep Impact DART AIDA Sample return Hayabusa Hayabusa2 Stardust OSIRIS-REx Planned Martian Moons eXploration (sample return, 2031) and Idefix (rover, 2029) M-Argo (flyby, 2027) DESTINY+ (multiple flybys, 2028) MBR Explorer (multiple flybys and orbiter, 2028) Ramses (2028) Comet Interceptor (flyby, 2029) Proposed Interstellar Probe (flyby, 2030–2042) Satis (2030) Shensuo (flybys, 2026) Next Generation Small-Body Sample Return (2034) Cancelled or not developed AGORA AIM ASTER Asteroid Redirect Mission Athena CAESAR Castalia Centaurus Chimera Clementine 2 Comet Hopper CONDOR CORSAIR CRAF Don Quijote HAMMER Hayabusa Mk2 Janus MAOSEP MANTIS Marco Polo New Horizons 2 OKEANOS Vesta Related Asteroid belt Asteroid capture Asteroid mining Colonization of asteroids Ceres Pluto Exploration Small Solar System bodies Near-Earth object Trans-Neptunian object Colonization Trojan Vesta Probes are listed in chronological order of launch. † indicates mission failures. v t e Planetary defense Main topics Asteroid Bolide Earth-grazing fireball Impact event Meteor air burst Meteor procession Meteor shower Meteorite Meteoroid Near-Earth object Potentially hazardous object Earth-crossing minor planets Asteroid close approaches Defense Asteroid impact avoidance Asteroid laser ablation Gravity tractor Ion-beam shepherd Space probes Dawn Deep Impact HAMMER AIDA Hera DART Halley Armada Hayabusa Hayabusa2 MASCOT NEAR Shoemaker NEA Scout New Horizons OSIRIS-REx PROCYON Rosetta Philae Stardust NEO tracking ATLAS Catalina Sky Survey LINEAR LONEOS NEAT NEODyS NEO Surveyor NEOSSat OGS Telescope Orbit@home Pan-STARRS SCAP Sentinel Space Telescope Sentry Spacewatch WISE Organizations B612 Foundation Japan Spaceguard Association The Meteoritical Society NEOShield Planetary Defense Coordination Office Spaceguard The Spaceguard Foundation Space Situational Awareness Programme United Nations Office for Outer Space Affairs Hazard rating Torino scale Palermo scale Potential threats 1950 DA 101955 Bennu 2010 RF12 99942 Apophis 2024 YR4 List of objects with non-zero Torino ratings Related categories Impact events Fiction about meteoroids Fiction about impact events

[Portals](https://en.wikipedia.org/wiki/Wikipedia:Contents/Portals):
- [Astronomy](https://en.wikipedia.org/wiki/Portal:Astronomy)
- [Spaceflight](https://en.wikipedia.org/wiki/Portal:Spaceflight)
- [Outer space](https://en.wikipedia.org/wiki/Portal:Outer_space)
- [Solar System](https://en.wikipedia.org/wiki/Portal:Solar_System)

---
Adapted from the Wikipedia article [Exoasteroid](https://en.wikipedia.org/wiki/Exoasteroid) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Exoasteroid?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.