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data-event-name="pinnable-header.vector-toc.pin">move to sidebar</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-toc.unpin">hide</button> </div> <ul class="vector-toc-contents" id="mw-panel-toc-list"> <li id="toc-mw-content-text" class="vector-toc-list-item vector-toc-level-1"> <a href="#" class="vector-toc-link"> <div class="vector-toc-text">(Top)</div> </a> </li> <li id="toc-Groups_out_to_the_orbit_of_Earth" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Groups_out_to_the_orbit_of_Earth"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>Groups out to the orbit of Earth</span> </div> </a> <ul id="toc-Groups_out_to_the_orbit_of_Earth-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Groups_out_to_the_orbit_of_Mars" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Groups_out_to_the_orbit_of_Mars"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Groups out to the orbit of Mars</span> </div> </a> <ul id="toc-Groups_out_to_the_orbit_of_Mars-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-The_asteroid_belt" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#The_asteroid_belt"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>The asteroid belt</span> </div> </a> <button aria-controls="toc-The_asteroid_belt-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle The asteroid belt subsection</span> </button> <ul id="toc-The_asteroid_belt-sublist" class="vector-toc-list"> <li id="toc-Other_groups_out_to_the_orbit_of_Jupiter" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Other_groups_out_to_the_orbit_of_Jupiter"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.1</span> <span>Other groups out to the orbit of Jupiter</span> </div> </a> <ul id="toc-Other_groups_out_to_the_orbit_of_Jupiter-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Groups_beyond_the_orbit_of_Jupiter" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Groups_beyond_the_orbit_of_Jupiter"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Groups beyond the orbit of Jupiter</span> </div> </a> <ul id="toc-Groups_beyond_the_orbit_of_Jupiter-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Groups_at_or_beyond_the_orbit_of_Neptune" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Groups_at_or_beyond_the_orbit_of_Neptune"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>Groups at or beyond the orbit of Neptune</span> </div> </a> <ul id="toc-Groups_at_or_beyond_the_orbit_of_Neptune-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-See_also" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#See_also"> <div class="vector-toc-text"> <span class="vector-toc-numb">6</span> <span>See also</span> </div> </a> <ul id="toc-See_also-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-References" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#References"> <div class="vector-toc-text"> <span class="vector-toc-numb">7</span> <span>References</span> </div> </a> <ul id="toc-References-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-External_links" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#External_links"> <div class="vector-toc-text"> <span class="vector-toc-numb">8</span> <span>External links</span> </div> </a> <ul id="toc-External_links-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Contents" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Toggle the table of contents" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">Toggle the table of contents</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">List of minor-planet groups</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Go to an article in another language. Available in 11 languages" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-11" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">11 languages</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D9%82%D8%A7%D8%A6%D9%85%D8%A9_%D9%85%D8%AC%D9%85%D9%88%D8%B9%D8%A7%D8%AA_%D8%A7%D9%84%D9%83%D9%88%D8%A7%D9%83%D8%A8_%D8%A7%D9%84%D8%B5%D8%BA%D9%8A%D8%B1%D8%A9" title="قائمة مجموعات الكواكب الصغيرة – Arabic" lang="ar" hreflang="ar" data-title="قائمة مجموعات الكواكب الصغيرة" data-language-autonym="العربية" data-language-local-name="Arabic" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Llista_de_grups_de_planetes_menors" title="Llista de grups de planetes menors – Catalan" lang="ca" hreflang="ca" data-title="Llista de grups de planetes menors" data-language-autonym="Català" data-language-local-name="Catalan" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Groupe_de_plan%C3%A8tes_mineures" title="Groupe de planètes mineures – French" lang="fr" hreflang="fr" data-title="Groupe de planètes mineures" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EC%86%8C%ED%96%89%EC%84%B1%EA%B5%B0" title="소행성군 – Korean" lang="ko" hreflang="ko" data-title="소행성군" data-language-autonym="한국어" data-language-local-name="Korean" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/%D4%B1%D5%BD%D5%BF%D5%A5%D6%80%D5%B8%D5%AB%D5%A4%D5%B6%D5%A5%D6%80%D5%AB_%D5%AD%D5%B4%D5%A2%D5%A5%D6%80" title="Աստերոիդների խմբեր – Armenian" lang="hy" hreflang="hy" data-title="Աստերոիդների խմբեր" data-language-autonym="Հայերեն" data-language-local-name="Armenian" class="interlanguage-link-target"><span>Հայերեն</span></a></li><li class="interlanguage-link interwiki-kk mw-list-item"><a href="https://kk.wikipedia.org/wiki/%D0%9A%D1%96%D1%88%D1%96_%D0%BF%D0%BB%D0%B0%D0%BD%D0%B5%D1%82%D0%B0%D0%BB%D0%B0%D1%80" title="Кіші планеталар – Kazakh" lang="kk" hreflang="kk" data-title="Кіші планеталар" data-language-autonym="Қазақша" data-language-local-name="Kazakh" class="interlanguage-link-target"><span>Қазақша</span></a></li><li class="interlanguage-link interwiki-ro mw-list-item"><a href="https://ro.wikipedia.org/wiki/Lista_grupurilor_de_planete_minore" title="Lista grupurilor de planete minore – Romanian" lang="ro" hreflang="ro" data-title="Lista grupurilor de planete minore" data-language-autonym="Română" data-language-local-name="Romanian" class="interlanguage-link-target"><span>Română</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%9A%D0%BB%D0%B0%D1%81%D1%81%D0%B8%D1%84%D0%B8%D0%BA%D0%B0%D1%86%D0%B8%D0%B8_%D0%BC%D0%B0%D0%BB%D1%8B%D1%85_%D0%BF%D0%BB%D0%B0%D0%BD%D0%B5%D1%82" title="Классификации малых планет – Russian" lang="ru" hreflang="ru" data-title="Классификации малых планет" data-language-autonym="Русский" data-language-local-name="Russian" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/K%C3%BC%C3%A7%C3%BCk_gezegen_gruplar%C4%B1_listesi" title="Küçük gezegen grupları listesi – Turkish" lang="tr" hreflang="tr" data-title="Küçük gezegen grupları listesi" data-language-autonym="Türkçe" data-language-local-name="Turkish" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%9A%D0%BB%D0%B0%D1%81%D0%B8%D1%84%D1%96%D0%BA%D0%B0%D1%86%D1%96%D1%97_%D0%BC%D0%B0%D0%BB%D0%B8%D1%85_%D0%BF%D0%BB%D0%B0%D0%BD%D0%B5%D1%82" title="Класифікації малих планет – Ukrainian" lang="uk" hreflang="uk" data-title="Класифікації малих планет" data-language-autonym="Українська" data-language-local-name="Ukrainian" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E5%B0%8F%E8%A1%8C%E6%98%9F%E7%BE%A4%E5%88%97%E8%A1%A8" title="小行星群列表 – Chinese" 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class="vector-page-tools-landmark" aria-label="Page tools"> <div id="vector-page-tools-pinned-container" class="vector-pinned-container"> </div> </nav> <nav class="vector-appearance-landmark" aria-label="Appearance"> <div id="vector-appearance-pinned-container" class="vector-pinned-container"> <div id="vector-appearance" class="vector-appearance vector-pinnable-element"> <div class="vector-pinnable-header vector-appearance-pinnable-header vector-pinnable-header-pinned" data-feature-name="appearance-pinned" data-pinnable-element-id="vector-appearance" data-pinned-container-id="vector-appearance-pinned-container" data-unpinned-container-id="vector-appearance-unpinned-container" > <div class="vector-pinnable-header-label">Appearance</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-appearance.pin">move to sidebar</button> <button class="vector-pinnable-header-toggle-button 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srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f3/InnerSolarSystem-en.png/330px-InnerSolarSystem-en.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f3/InnerSolarSystem-en.png/440px-InnerSolarSystem-en.png 2x" data-file-width="600" data-file-height="600" /></a><figcaption></figcaption></figure> <p>A <b>minor-planet group</b> is a population of <a href="/wiki/Minor_planet" title="Minor planet">minor planets</a> that share broadly similar orbits. Members are generally unrelated to each other, unlike in an <a href="/wiki/Asteroid_family" title="Asteroid family">asteroid family</a>, which often results from the break-up of a single asteroid. It is customary to name a group of asteroids after the first member of that group to be discovered, which is often the largest. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Groups_out_to_the_orbit_of_Earth">Groups out to the orbit of Earth</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=List_of_minor-planet_groups&action=edit&section=1" title="Edit section: Groups out to the orbit of Earth"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>There are relatively few asteroids that orbit close to the Sun. Several of these groups are hypothetical at this point in time, with no members having yet been discovered; as such, the names they have been given are provisional. </p> <ul><li><a href="/wiki/Vulcanoid_asteroid" class="mw-redirect" title="Vulcanoid asteroid">Vulcanoid asteroids</a> are hypothetical asteroids that orbit entirely within the orbit of <a href="/wiki/Mercury_(planet)" title="Mercury (planet)">Mercury</a> (have an <a href="/wiki/Aphelion" class="mw-redirect" title="Aphelion">aphelion</a> of less than 0.3874 AU). A few searches for vulcanoids have been conducted but none have been discovered so far.</li> <li><a href="/wiki/%EA%9E%8BAyl%C3%B3%EA%9E%8Cchaxnim_asteroid" class="mw-redirect" title="ꞋAylóꞌchaxnim asteroid">ꞌAylóꞌchaxnim asteroids</a> (previously named Vatira) are asteroids that orbit entirely within the orbit of <a href="/wiki/Venus" title="Venus">Venus</a> (have an aphelion of less than 0.718 AU). As of 2022<sup class="plainlinks noexcerpt noprint asof-tag update" style="display:none;"><a class="external text" href="https://en.wikipedia.org/w/index.php?title=List_of_minor-planet_groups&action=edit">[update]</a></sup>, one such asteroid is known: <a href="/wiki/594913_%EA%9E%8CAyl%C3%B3%EA%9E%8Cchaxnim" title="594913 ꞌAylóꞌchaxnim">594913 ꞌAylóꞌchaxnim</a>.</li> <li><a href="/wiki/Atira_asteroid" title="Atira asteroid">Atira asteroids</a> (Apohele; Interior-Earth Objects) are a small group of known asteroids whose aphelion is less than 0.983 AU, meaning they orbit entirely within Earth's orbit. The group is named after its first confirmed member, <a href="/wiki/163693_Atira" title="163693 Atira">163693 Atira</a>. As of 2020<sup class="plainlinks noexcerpt noprint asof-tag update" style="display:none;"><a class="external text" href="https://en.wikipedia.org/w/index.php?title=List_of_minor-planet_groups&action=edit">[update]</a></sup>, the group consists of 22 members, 6 of which are numbered.<sup id="cite_ref-jpl-search-by-smallest-aphelion_1-0" class="reference"><a href="#cite_note-jpl-search-by-smallest-aphelion-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup></li> <li><a href="/wiki/List_of_Mercury-crossing_minor_planets" title="List of Mercury-crossing minor planets">Mercury-crosser asteroids</a> having a <a href="/wiki/Perihelion" class="mw-redirect" title="Perihelion">perihelion</a> smaller than Mercury's 0.3075 AU.</li> <li><a href="/wiki/List_of_Venus-crossing_minor_planets" title="List of Venus-crossing minor planets">Venus-crosser asteroids</a> having a perihelion smaller than <a href="/wiki/Venus" title="Venus">Venus</a>'s 0.7184 AU. This group includes the above Mercury-crossers (if their aphelion is greater than Venus's perihelion. All known Mercury crossers satisfy this condition except ꞌAylóꞌchaxnim, which has an aphelion smaller than Venus's perihelion and a perihelion slightly smaller than Mercury's aphelion).</li> <li><a href="/wiki/List_of_Earth-crossing_minor_planets" class="mw-redirect" title="List of Earth-crossing minor planets">Earth-crosser asteroids</a> having a perihelion smaller than <a href="/wiki/Earth" title="Earth">Earth</a>'s 0.9833 AU. This group includes the above Mercury- and Venus-crossers, apart from the Apoheles. They are also divided into the <ul><li><a href="/wiki/Aten_asteroid" title="Aten asteroid">Aten asteroids</a> having a <a href="/wiki/Semi-major_axis" class="mw-redirect" title="Semi-major axis">semi-major axis</a> less than 1 AU, named after <a href="/wiki/2062_Aten" title="2062 Aten">2062 Aten</a>.</li> <li><a href="/wiki/Apollo_asteroid" title="Apollo asteroid">Apollo asteroids</a> having a <a href="/wiki/Semi-major_axis" class="mw-redirect" title="Semi-major axis">semi-major axis</a> greater than 1 AU, named after <a href="/wiki/1862_Apollo" title="1862 Apollo">1862 Apollo</a>.</li></ul></li> <li><a href="/wiki/Arjuna_asteroid" title="Arjuna asteroid">Arjuna asteroids</a> are somewhat vaguely defined as having orbits similar to Earth's; i.e. with an average orbital radius of around 1 AU and with low eccentricity and inclination.<sup id="cite_ref-geo_2-0" class="reference"><a href="#cite_note-geo-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> Due to the vagueness of this definition some asteroids belonging to the <a href="/wiki/Atira_asteroid" title="Atira asteroid">Atira</a>, <a href="/wiki/Amor_asteroid" title="Amor asteroid">Amor</a>, <a href="/wiki/Apollo_asteroid" title="Apollo asteroid">Apollo</a> or <a href="/wiki/Aten_asteroid" title="Aten asteroid">Aten</a> groups can also be classified as Arjunas. The term was introduced by <a href="/wiki/Spacewatch" title="Spacewatch">Spacewatch</a> and does not refer to an existing asteroid; examples of Arjunas include <a href="/wiki/1991_VG" title="1991 VG">1991 VG</a>.</li> <li><a href="/wiki/Earth_trojan" title="Earth trojan">Earth trojans</a> are asteroids located in the Earth–Sun <a href="/wiki/Lagrangian_point" class="mw-redirect" title="Lagrangian point">Lagrangian points</a> <a href="/wiki/Lagrange_point#L4_and_L5" title="Lagrange point">L<sub>4</sub></a> and <a href="/wiki/Lagrange_point#L4_and_L5" title="Lagrange point">L<sub>5</sub></a>. Their location in the sky as observed from Earth's surface would be fixed at about 60 degrees east and west of the Sun, and as people tend to search for asteroids at much greater elongations few searches have been done in these locations. The only known Earth trojans are <span class="nowrap"><a href="/wiki/2010_TK7" class="mw-redirect" title="2010 TK7">2010 TK<span style="position: relative; top: 0.3em;"><span style="font-size:80%;">7</span></span></a></span> and <span class="nowrap"><a href="/wiki/2020_XL5" class="mw-redirect" title="2020 XL5">2020 XL<span style="position: relative; top: 0.3em;"><span style="font-size:80%;">5</span></span></a></span>.</li> <li><a href="/wiki/Near-Earth_asteroid" class="mw-redirect" title="Near-Earth asteroid">Near-Earth asteroids</a> is a catch-all term for asteroids whose orbit closely approaches that of Earth. It includes almost all of the above groups, as well as the <a href="/wiki/Amor_asteroid" title="Amor asteroid">Amor asteroids</a>.</li></ul> <div class="mw-heading mw-heading2"><h2 id="Groups_out_to_the_orbit_of_Mars">Groups out to the orbit of Mars</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=List_of_minor-planet_groups&action=edit&section=2" title="Edit section: Groups out to the orbit of Mars"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li>The <a href="/wiki/Amor_asteroid" title="Amor asteroid">Amor</a> asteroids, named after <a href="/wiki/1221_Amor" title="1221 Amor">1221 Amor</a>, are <a href="/wiki/Near-Earth_asteroid" class="mw-redirect" title="Near-Earth asteroid">near-Earth asteroids</a> that are not <a href="/wiki/List_of_Earth-crossing_minor_planets" class="mw-redirect" title="List of Earth-crossing minor planets">Earth-crossers</a>, having a perihelion just outside the Earth's orbit.</li> <li><a href="/wiki/List_of_Mars-crossing_minor_planets" title="List of Mars-crossing minor planets">Mars-crosser asteroids</a> have orbits that cross that of Mars, but do not necessarily closely approach the Earth's.</li> <li><a href="/wiki/Mars_trojan" title="Mars trojan">Mars trojans</a> follow or lead Mars on its orbit, at either of the two <a href="/wiki/Lagrangian_point" class="mw-redirect" title="Lagrangian point">Lagrangian points</a> 60° ahead (<a href="/wiki/Lagrange_point#L4_and_L5" title="Lagrange point">L<sub>4</sub></a>) or behind (<a href="/wiki/Lagrange_point#L4_and_L5" title="Lagrange point">L<sub>5</sub></a>). As of November 2020, nine are known. The largest appears to be <a href="/wiki/5261_Eureka" title="5261 Eureka">5261 Eureka</a>.</li> <li>Many of the Earth-, Venus-, and Mercury-crosser asteroids have aphelia greater than 1 AU.</li></ul> <div class="mw-heading mw-heading2"><h2 id="The_asteroid_belt">The asteroid belt</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=List_of_minor-planet_groups&action=edit&section=3" title="Edit section: The asteroid belt"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1236090951">.mw-parser-output .hatnote{font-style:italic}.mw-parser-output div.hatnote{padding-left:1.6em;margin-bottom:0.5em}.mw-parser-output .hatnote i{font-style:normal}.mw-parser-output .hatnote+link+.hatnote{margin-top:-0.5em}@media print{body.ns-0 .mw-parser-output .hatnote{display:none!important}}</style><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Asteroid_belt" title="Asteroid belt">Asteroid belt</a></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Kirkwood_Gaps.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d3/Kirkwood_Gaps.svg/220px-Kirkwood_Gaps.svg.png" decoding="async" width="220" height="170" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d3/Kirkwood_Gaps.svg/330px-Kirkwood_Gaps.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d3/Kirkwood_Gaps.svg/440px-Kirkwood_Gaps.svg.png 2x" data-file-width="792" data-file-height="612" /></a><figcaption><a href="/wiki/Histogram" title="Histogram">Histogram</a> showing the four most prominent <a href="/wiki/Kirkwood_gap" title="Kirkwood gap">Kirkwood gaps</a> and a possible division into inner, middle and outer <a href="/wiki/Main-belt" class="mw-redirect" title="Main-belt">main-belt</a> asteroids:<br /><style data-mw-deduplicate="TemplateStyles:r981673959">.mw-parser-output .legend{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .legend-color{display:inline-block;min-width:1.25em;height:1.25em;line-height:1.25;margin:1px 0;text-align:center;border:1px solid black;background-color:transparent;color:black}.mw-parser-output .legend-text{}</style><span class="legend nowrap"><span class="legend-color mw-no-invert" style="border: 1px solid #333;background-color:#005aff; color:white;"> </span> inner main-belt (<a href="/wiki/Semi-major_axis" class="mw-redirect" title="Semi-major axis"><i>a</i></a> < 2.5 <a href="/wiki/Astronomical_unit" title="Astronomical unit">AU</a>)</span><br /><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r981673959"><span class="legend nowrap"><span class="legend-color mw-no-invert" style="border: 1px solid #222;background-color:#ffa500; color:black;"> </span> middle main-belt (2.5 AU < <i>a</i> < 2.82 AU)</span><br /><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r981673959"><span class="legend nowrap"><span class="legend-color mw-no-invert" style="border: 1px solid #333;background-color:#55d400; color:black;"> </span> outer main-belt (<i>a</i> > 2.82 AU</span></figcaption></figure> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Main_belt_i_vs_a.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/e/ed/Main_belt_i_vs_a.png/220px-Main_belt_i_vs_a.png" decoding="async" width="220" height="172" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/ed/Main_belt_i_vs_a.png/330px-Main_belt_i_vs_a.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/ed/Main_belt_i_vs_a.png/440px-Main_belt_i_vs_a.png 2x" data-file-width="1067" data-file-height="834" /></a><figcaption>Asteroid groups out to the orbit of Jupiter. The asteroid belt is shown in red</figcaption></figure> <p>The overwhelming majority of known asteroids have orbits lying between the orbits of <a href="/wiki/Mars" title="Mars">Mars</a> and <a href="/wiki/Jupiter" title="Jupiter">Jupiter</a>, roughly between 2 and 4 <a href="/wiki/Astronomical_unit" title="Astronomical unit">AU</a>. These could not form a planet due to the gravitational influence of Jupiter. Jupiter's gravitational influence, through <a href="/wiki/Orbital_resonance" title="Orbital resonance">orbital resonance</a>, clears <a href="/wiki/Kirkwood_gap" title="Kirkwood gap">Kirkwood gaps</a> in the asteroid belt, first recognised by <a href="/wiki/Daniel_Kirkwood" title="Daniel Kirkwood">Daniel Kirkwood</a> in 1874. </p><p>The region with the densest concentration (lying between the Kirkwood gaps at 2.06 and 3.27 AU, with <a href="/wiki/Eccentricity_(orbit)" class="mw-redirect" title="Eccentricity (orbit)">eccentricities</a> below about 0.3, and inclinations smaller than 30°) is called the <a href="/wiki/Asteroid_belt" title="Asteroid belt">asteroid belt</a>. It can be further subdivided by the Kirkwood Gaps into the: </p> <ul><li><b>Inner asteroid belt</b>, inside of the strong Kirkwood gap at 2.50 AU due to the 3:1 Jupiter <a href="/wiki/Orbital_resonance" title="Orbital resonance">orbital resonance</a>. The largest member is <a href="/wiki/4_Vesta" title="4 Vesta">4 Vesta</a>. <ul><li>It apparently also includes a group called the main-belt I asteroids which have a semi-major axis between 2.3 AU and 2.5 AU and an inclination of less than 18°.</li></ul></li> <li><b>Middle</b> (or intermediate) <b>asteroid belt</b>, between the 3:1 and 5:2 Jupiter orbital resonances, the latter at 2.82 AU. The largest member is <a href="/wiki/Ceres_(dwarf_planet)" title="Ceres (dwarf planet)">Ceres</a>. This group is apparently split into the: <ul><li>Main-belt IIa asteroids which have a semi-major axis between 2.5 AU and 2.706 AU and an inclination less than 33°.</li> <li>Main-belt IIb asteroids which have a semi-major axis between 2.706 AU and 2.82 AU and an inclination less than 33°.</li></ul></li> <li><b>Outer asteroid belt</b> between the 5:2 and 2:1 Jupiter orbital resonances. The largest member is <a href="/wiki/10_Hygiea" title="10 Hygiea">10 Hygiea</a>. This group is apparently split into the: <ul><li>Main-belt IIIa asteroids which have a semi-major axis between 2.82 AU and 3.03 AU, an eccentricity less than .35, and an inclination less than 30°.</li> <li>Main-belt IIIb asteroids which have a semi-major axis between 3.03 AU and 3.27 AU, an eccentricity less than .35, and an inclination less than 30°.</li></ul></li></ul> <div class="mw-heading mw-heading3"><h3 id="Other_groups_out_to_the_orbit_of_Jupiter">Other groups out to the orbit of Jupiter</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=List_of_minor-planet_groups&action=edit&section=4" title="Edit section: Other groups out to the orbit of Jupiter"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>There are a number of more or less distinct asteroid groups outside the asteroid belt, distinguished either by mean distance from the Sun, or particular combinations of several orbital elements: </p> <ul><li>The <a href="/wiki/Hungaria_family" title="Hungaria family">Hungaria asteroids</a>, with a mean orbital radius between 1.78 AU and 2 AU, an eccentricity less than 0.18, and inclination between 16° and 34°. Named after <a href="/wiki/434_Hungaria" title="434 Hungaria">434 Hungaria</a>, these are just outside Mars's orbit, and are possibly attracted by the 9:2 Jupiter resonance or the 3:2 Mars resonance.</li> <li>The <a href="/wiki/Phocaea_family" title="Phocaea family">Phocaea asteroids</a>, with a mean orbital radius between 2.25 AU and 2.5 AU, an eccentricity greater than 0.1, and inclination between 18° and 32°. Some sources group the Phocaeas asteroids with the Hungarias, but the division between the two groups is real and caused by the 4:1 resonance with Jupiter. Named after <a href="/wiki/25_Phocaea" title="25 Phocaea">25 Phocaea</a>.</li> <li>The <a href="/wiki/Alinda_asteroid" title="Alinda asteroid">Alinda asteroids</a> have a mean orbital radius of 2.5 AU and an eccentricity between 0.4 and 0.65 (approximately). These objects are held by the 3:1 resonance with Jupiter and a 4:1 resonance with <a href="/wiki/Earth" title="Earth">Earth</a>. Many Alinda asteroids have perihelia very close to Earth's orbit and can be difficult to observe for this reason. Alinda asteroids are <i>not</i> in stable orbits and eventually will collide either with Jupiter or terrestrial planets. Named after <a href="/wiki/887_Alinda" title="887 Alinda">887 Alinda</a>.</li> <li>The <a href="/wiki/Pallas_family" title="Pallas family">Pallas family</a> asteroids have a mean orbital radius between 2.7 and 2.8 AU and an inclination between 30° and 38°. Named after <a href="/wiki/2_Pallas" title="2 Pallas">2 Pallas</a>.</li> <li>The <a href="/wiki/Griqua_group" class="mw-redirect" title="Griqua group">Griqua asteroids</a> have an orbital radius between 3.1 AU and 3.27 AU and an eccentricity greater than 0.35. These asteroids are in stable 2:1 <a href="/wiki/Libration" title="Libration">libration</a> with Jupiter, in high-inclination orbits. There are about 5 to 10 of these known so far, with <a href="/wiki/1362_Griqua" title="1362 Griqua">1362 Griqua</a> and <a href="/wiki/8373_Stephengould" title="8373 Stephengould">8373 Stephengould</a> the most prominent.</li> <li>The <a href="/wiki/Cybele_asteroids" title="Cybele asteroids">Cybele asteroids</a> have a mean orbital radius between 3.27 AU and 3.7 AU,<sup id="cite_ref-Carruba-2013_3-0" class="reference"><a href="#cite_note-Carruba-2013-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> an eccentricity less than 0.3,<sup id="cite_ref-tanton_4-0" class="reference"><a href="#cite_note-tanton-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> and an inclination less than 30°.<sup id="cite_ref-Carruba-2013_3-1" class="reference"><a href="#cite_note-Carruba-2013-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> This group appears to cluster around the 7:4 resonance with Jupiter. Named after <a href="/wiki/65_Cybele" title="65 Cybele">65 Cybele</a>.<sup id="cite_ref-tanton_4-1" class="reference"><a href="#cite_note-tanton-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup></li> <li><a href="/wiki/Hilda_group" class="mw-redirect" title="Hilda group">Hilda asteroids</a> have a mean orbital radius between 3.7 AU and 4.2 AU, an eccentricity greater than 0.07, and an inclination less than 20°. These asteroids are in a 3:2 resonance with Jupiter. Named after <a href="/wiki/153_Hilda" title="153 Hilda">153 Hilda</a>.</li> <li>The <a href="/wiki/Thule_asteroid" class="mw-redirect" title="Thule asteroid">Thule asteroids</a> are in a 4:3 resonance with Jupiter and the group is known to consist of <a href="/wiki/279_Thule" title="279 Thule">279 Thule</a>, <span class="nowrap"><a href="/wiki/(186024)_2001_QG207" class="mw-redirect" title="(186024) 2001 QG207">(186024) 2001 QG<span style="position: relative; top: 0.3em;"><span style="font-size:80%;">207</span></span></a></span>, and <span class="nowrap"><a href="/wiki/(185290)_2006_UB219" class="mw-redirect" title="(185290) 2006 UB219">(185290) 2006 UB<span style="position: relative; top: 0.3em;"><span style="font-size:80%;">219</span></span></a></span>.<sup id="cite_ref-Broz-2008_5-0" class="reference"><a href="#cite_note-Broz-2008-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup></li> <li>The <a href="/wiki/Jupiter_trojan" title="Jupiter trojan">Jupiter trojans</a> have a mean orbital radius between 5.05 AU and 5.4 AU, and lie in elongated, curved regions around the two <a href="/wiki/Lagrangian_point" class="mw-redirect" title="Lagrangian point">Lagrangian points</a> 60° ahead and behind of Jupiter. The leading point, <a href="/wiki/Lagrange_point#L4_and_L5" title="Lagrange point">L<sub>4</sub></a>, is called the <a href="/wiki/Greek_camp" class="mw-redirect" title="Greek camp">Greek camp</a> and the trailing <a href="/wiki/Lagrange_point#L4_and_L5" title="Lagrange point">L<sub>5</sub></a> point is called the <a href="/wiki/Trojan_camp" class="mw-redirect" title="Trojan camp">Trojan camp</a>, after the two opposing camps of the legendary <a href="/wiki/Trojan_War" title="Trojan War">Trojan War</a>; with one exception apiece, objects in each node are named for members of that side of the conflict. <a href="/wiki/617_Patroclus" title="617 Patroclus">617 Patroclus</a> in the Trojan camp and <a href="/wiki/624_Hektor" title="624 Hektor">624 Hektor</a> in the Greek camp are "misplaced" in the enemy camps.</li></ul> <p>There is a forbidden zone between the Hildas and the Trojans (roughly 4.05 AU to 4.94 AU). Aside from <a href="/wiki/279_Thule" title="279 Thule">279 Thule</a> and 228 objects in mostly unstable-looking orbits, Jupiter's gravity has swept everything out of this region. </p> <div class="mw-heading mw-heading2"><h2 id="Groups_beyond_the_orbit_of_Jupiter">Groups beyond the orbit of Jupiter</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=List_of_minor-planet_groups&action=edit&section=5" title="Edit section: Groups beyond the orbit of Jupiter"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Most of the minor planets beyond the orbit of Jupiter are believed to be composed of <a href="/wiki/Ice" title="Ice">ices</a> and other <a href="/wiki/Volatile_(astrogeology)" title="Volatile (astrogeology)">volatiles</a>. Many are similar to <a href="/wiki/Comet" title="Comet">comets</a>, differing only in that the <a href="/wiki/Perihelion" class="mw-redirect" title="Perihelion">perihelia</a> of their orbits are too distant from the Sun to produce a significant tail. </p> <ul><li>The <a href="/wiki/Damocloid_asteroid" class="mw-redirect" title="Damocloid asteroid">Damocloid asteroids</a>, also known as the "Oort cloud group," are named after <a href="/wiki/5335_Damocles" title="5335 Damocles">5335 Damocles</a>. They are defined to be objects that have "fallen in" from the <a href="/wiki/Oort_cloud" title="Oort cloud">Oort cloud</a>, so their aphelia are generally still out past <a href="/wiki/Uranus" title="Uranus">Uranus</a>, but their perihelia are in the inner Solar System. They have high eccentricities and sometimes high inclinations, including <a href="/wiki/Retrograde_orbit" class="mw-redirect" title="Retrograde orbit">retrograde orbits</a>. The definition of this group is somewhat fuzzy, and may overlap significantly with comets.</li> <li>The <a href="/wiki/Centaur_(minor_planet)" class="mw-redirect" title="Centaur (minor planet)">Centaurs</a> have a mean orbital radius roughly between 5.4 AU and 30 AU. They are currently believed to be <a href="/wiki/Trans-Neptunian_object" title="Trans-Neptunian object">trans-Neptunian objects</a> that "fell in" after encounters with gas giants. The first of these to be identified was <a href="/wiki/2060_Chiron" title="2060 Chiron">2060 Chiron</a> (<a href="/wiki/944_Hidalgo" title="944 Hidalgo">944 Hidalgo</a> was discovered before, but not identified as a distinct orbital class).</li></ul> <div class="mw-heading mw-heading2"><h2 id="Groups_at_or_beyond_the_orbit_of_Neptune">Groups at or beyond the orbit of Neptune</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=List_of_minor-planet_groups&action=edit&section=6" title="Edit section: Groups at or beyond the orbit of Neptune"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li>The <a href="/wiki/Neptune_trojan" title="Neptune trojan">Neptune trojans</a> as of February 2020 consist of 29 objects. The first one to be discovered was <span class="nowrap"><a href="/wiki/2001_QR322" class="mw-redirect" title="2001 QR322">2001 QR<span style="position: relative; top: 0.3em;"><span style="font-size:80%;">322</span></span></a></span>.</li> <li><a href="/wiki/Trans-Neptunian_object" title="Trans-Neptunian object">Trans-Neptunian objects</a> (TNOs) are anything with a mean orbital radius greater than 30 AU. This classification includes the Kuiper-belt objects (KBOs), the scattered disc, and the Oort cloud. <ul><li><a href="/wiki/Kuiper_belt" title="Kuiper belt">Kuiper-belt</a> objects extend from roughly 30 AU to 50 AU and are broken into the following subcategories: <ul><li><a href="/wiki/Resonant_trans-Neptunian_object" title="Resonant trans-Neptunian object">Resonant objects</a> occupy orbital resonances with Neptune, excluding the 1:1 resonance of the Neptune trojans. <ul><li><a href="/wiki/Plutino" title="Plutino">Plutinos</a> are by far the most common resonant KBOs and are in a 2:3 resonance with Neptune, just like <a href="/wiki/Pluto" title="Pluto">Pluto</a>. The perihelion of such an object tends to be close to Neptune's orbit (much as happens with Pluto), but when the object comes to perihelion, Neptune alternates between being 90 degrees ahead of and 90 degrees behind of the object, so there's no chance of a collision. The MPC defines any object with a mean orbital radius between 39 AU and 40.5 AU to be a plutino. <a href="/wiki/90482_Orcus" class="mw-redirect" title="90482 Orcus">90482 Orcus</a> and <a href="/wiki/28978_Ixion" title="28978 Ixion">28978 Ixion</a> are among the brightest known.</li> <li>Other resonances. There are several known objects in the 1:2 resonance, dubbed <i>twotinos</i>, with a mean orbital radius of 47.7 AU and an eccentricity of 0.37. There are several objects in the 2:5 (mean orbital radius of 55 AU), 4:7, 4:5, 3:10, 3:5, and 3:4 resonances, among others. The largest in the 2:5 resonance is <span class="nowrap"><a href="/wiki/(84522)_2002_TC302" title="(84522) 2002 TC302">(84522) 2002 TC<span style="position: relative; top: 0.3em;"><span style="font-size:80%;">302</span></span></a></span>, and the largest in the 3:10 resonance is <a href="/wiki/225088_Gonggong" class="mw-redirect" title="225088 Gonggong">225088 Gonggong</a>.</li></ul></li> <li><a href="/wiki/Classical_Kuiper_belt_object" title="Classical Kuiper belt object">Classical Kuiper-belt objects</a>, also known as cubewanos (after <a href="/wiki/15760_Albion" title="15760 Albion">15760 Albion</a>, which had the provisional designation <span class="nowrap"><a href="/wiki/(15760)_1992_QB1" class="mw-redirect" title="(15760) 1992 QB1">(15760) 1992 QB<span style="position: relative; top: 0.3em;"><span style="font-size:80%;">1</span></span></a></span> from its 1992 discovery to its 2018 naming), have a mean orbital radius between approximately 40.5 AU and 47 AU. Cubewanos are objects in the Kuiper belt that didn't get scattered and didn't get locked into a resonance with Neptune. The largest is <a href="/wiki/Makemake" title="Makemake">Makemake</a>.</li></ul></li> <li><a href="/wiki/Scattered_disc" title="Scattered disc">Scattered disc</a> objects (SDOs) typically have, unlike cubewanos and resonant objects, high-inclination, high-eccentricity orbits with perihelia that are still not too far from Neptune's orbit. They are assumed to be objects that encountered Neptune and were "scattered" out of their originally more circular orbits close to the ecliptic. The most massive known dwarf planet, <a href="/wiki/Eris_(dwarf_planet)" title="Eris (dwarf planet)">Eris</a>, belongs to this category. <ul><li><a href="/wiki/Detached_object" title="Detached object">Detached objects</a> (extended scattered disk) with generally highly elliptical, very large orbits of up to a few hundred AU and a perihelion too far from <a href="/wiki/Neptune" title="Neptune">Neptune</a>'s orbit for any significant interaction to occur. A more typical member of the extended disk is <span class="nowrap"><a href="/wiki/(148209)_2000_CR105" title="(148209) 2000 CR105">(148209) 2000 CR<span style="position: relative; top: 0.3em;"><span style="font-size:80%;">105</span></span></a></span>. <ul><li><a href="/wiki/Sednoid" title="Sednoid">Sednoids</a> have perihelia very far removed from the orbit of Neptune. This group is named after the best-known member, <a href="/wiki/90377_Sedna" class="mw-redirect" title="90377 Sedna">90377 Sedna</a>. As of 2020, only 4 objects in this category have been identified, but it is suspected that there are many more.</li></ul></li></ul></li> <li>The <a href="/wiki/Oort_cloud" title="Oort cloud">Oort cloud</a> is a hypothetical cloud of comets with a mean orbital radius between approximately 50,000 AU and 100,000 AU. No Oort-cloud objects have been detected; the existence of this classification is only inferred from indirect evidence. Some astronomers have tentatively associated <a href="/wiki/90377_Sedna" class="mw-redirect" title="90377 Sedna">90377 Sedna</a> with the inner Oort cloud.</li></ul></li></ul> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=List_of_minor-planet_groups&action=edit&section=7" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Dwarf_planet" title="Dwarf planet">Dwarf planet</a></li> <li><a href="/wiki/List_of_minor_planets#Category" title="List of minor planets">List of minor planets § Category</a></li> <li><a href="/wiki/Minor_Planet_Center" title="Minor Planet Center">Minor Planet Center</a></li> <li><a href="/wiki/Mesoplanet" title="Mesoplanet">Mesoplanet</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=List_of_minor-planet_groups&action=edit&section=8" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-jpl-search-by-smallest-aphelion-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-jpl-search-by-smallest-aphelion_1-0">^</a></b></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output 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(2010). <a rel="nofollow" class="external text" href="https://books.google.com/books?id=K-0xBsMsursC&pg=PA96"><i>Linda T. Elkins-Tanton – <b>Asteroids, Meteorites, and Comets</b> (2010) – Page 96 (Google Books)</i></a>. 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href="/w/index.php?title=List_of_minor-planet_groups&action=edit&section=9" title="Edit section: External links"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a rel="nofollow" class="external text" href="https://web.archive.org/web/20110418072433/https://minorplanetcenter.net/blog/asteroid-classification-i-dynamics/">Asteroid Classification I – Dynamics</a>, <i><a href="/wiki/Minor_Planet_Center" title="Minor Planet Center">Minor Planet Center</a></i>, (archived; 18 Apr 2011)</li></ul> <style data-mw-deduplicate="TemplateStyles:r1235681985">.mw-parser-output .side-box{margin:4px 0;box-sizing:border-box;border:1px solid #aaa;font-size:88%;line-height:1.25em;background-color:var(--background-color-interactive-subtle,#f8f9fa);display:flow-root}.mw-parser-output .side-box-abovebelow,.mw-parser-output .side-box-text{padding:0.25em 0.9em}.mw-parser-output .side-box-image{padding:2px 0 2px 0.9em;text-align:center}.mw-parser-output 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.navbar{display:none!important}}</style><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Asteroids" title="Template:Asteroids"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Asteroids" title="Template talk:Asteroids"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Asteroids" title="Special:EditPage/Template:Asteroids"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Asteroids" style="font-size:114%;margin:0 4em"><a href="/wiki/Asteroid" title="Asteroid">Asteroids</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%">Main</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/List_of_exceptional_asteroids" title="List of exceptional asteroids">Notable asteroids</a></li> <li><a href="/wiki/Standard_asteroid_physical_characteristics" title="Standard asteroid physical characteristics">Physical characteristics</a> <ul><li><a href="/wiki/Dynamic_method" title="Dynamic method">dynamic method</a></li></ul></li> <li><a href="/wiki/Asteroid_impact_avoidance" title="Asteroid impact avoidance">Impact avoidance</a></li> <li><a href="/wiki/Near-Earth_Asteroid_Tracking" title="Near-Earth Asteroid Tracking">Tracking</a></li> <li><a href="/wiki/Gravitational_keyhole" title="Gravitational keyhole">Gravitational keyhole</a></li> <li><a href="/wiki/List_of_Earth-crossing_minor_planets" class="mw-redirect" title="List of Earth-crossing minor planets">Earth-crosser</a></li> <li><a href="/wiki/List_of_asteroid_close_approaches_to_Earth" title="List of asteroid close approaches to Earth">Close approaches</a></li> <li><a href="/wiki/Binary_asteroid" title="Binary asteroid">Binary</a> <ul><li><a href="/wiki/Minor-planet_moon" title="Minor-planet moon">moon</a></li> <li><a href="/wiki/Contact_binary_(small_Solar_System_body)" title="Contact binary (small Solar System body)">contact</a></li></ul></li> <li><a href="/wiki/Active_asteroid" title="Active asteroid">Active</a></li> <li><a href="/wiki/Asteroid_pair" title="Asteroid pair">Asteroid pair</a></li> <li><a href="/wiki/Palomar%E2%80%93Leiden_survey" title="Palomar–Leiden survey">Palomar–Leiden survey</a></li> <li><a href="/wiki/Contact_binary_(small_Solar_System_body)" title="Contact binary (small Solar System body)">Contact binary</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Asteroid#Distribution_within_the_Solar_System" title="Asteroid">Distribution</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Trojan_(celestial_body)" title="Trojan (celestial body)">Trojans</a> <ul><li><a href="/wiki/2013_ND15" title="2013 ND15">Venus trojan</a></li> <li><a href="/wiki/Earth_trojan" title="Earth trojan">Earth trojans</a></li> <li><a href="/wiki/Mars_trojan" title="Mars trojan">Mars trojans</a></li> <li><a href="/wiki/Jupiter_trojan" title="Jupiter trojan">Jupiter trojans</a></li> <li><a href="/wiki/Uranus_trojan" class="mw-redirect" title="Uranus trojan">Uranus trojans</a></li> <li><a href="/wiki/Neptune_trojan" title="Neptune trojan">Neptune trojans</a></li></ul></li> <li>Interior to Earth <ul><li><a href="/wiki/Vulcanoid" title="Vulcanoid">Vulcanoids</a></li> <li><a href="/wiki/List_of_Mercury-crossing_minor_planets" title="List of Mercury-crossing minor planets">Mercury-crossers</a></li> <li><a href="/wiki/List_of_Venus-crossing_minor_planets" title="List of Venus-crossing minor planets">Venus-crossers</a></li></ul></li> <li><a href="/wiki/Near-Earth_object" title="Near-Earth object">Near-Earth</a> <ul><li><a href="/wiki/Aten_asteroid" title="Aten asteroid">Aten</a></li> <li><a href="/wiki/Amor_asteroid" title="Amor asteroid">Amor</a></li> <li><a href="/wiki/Apollo_asteroid" title="Apollo asteroid">Apollo</a></li> <li><a href="/wiki/Atira_asteroid" title="Atira asteroid">Atira</a></li> <li><a href="/wiki/List_of_Earth-crossing_minor_planets" class="mw-redirect" title="List of Earth-crossing minor planets">Earth-crossers</a></li></ul></li> <li>Between Earth and the main belt <ul><li><a href="/wiki/List_of_Mars-crossing_minor_planets" title="List of Mars-crossing minor planets">Mars crossers</a></li></ul></li> <li><a href="/wiki/Asteroid_belt" title="Asteroid belt">Asteroid belt</a> <ul><li><a href="/wiki/Kirkwood_gap" title="Kirkwood gap">Kirkwood gap</a></li> <li><a href="/wiki/Active_asteroid" title="Active asteroid">Active asteroids</a></li></ul></li> <li>Outer Solar System, does not include <a href="/wiki/Distant_minor_planet" title="Distant minor planet">distant minor planets</a> <ul><li><a href="/wiki/List_of_Jupiter-crossing_minor_planets" title="List of Jupiter-crossing minor planets">Jupiter-crossers</a></li> <li><a href="/wiki/List_of_Saturn-crossing_minor_planets" title="List of Saturn-crossing minor planets">Saturn-crossers</a></li> <li><a href="/wiki/List_of_Uranus-crossing_minor_planets" title="List of Uranus-crossing minor planets">Uranus-crossers</a></li> <li><a href="/wiki/List_of_Neptune-crossing_minor_planets" title="List of Neptune-crossing minor planets">Neptune-crossers</a></li></ul></li> <li><a href="/wiki/Centaur_(small_Solar_System_body)" title="Centaur (small Solar System body)">Centaurs</a></li> <li><a href="/wiki/Exoasteroid" title="Exoasteroid">Exoasteroids</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Asteroid#Classification" title="Asteroid">Classification</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Asteroid#Orbital_classification" title="Asteroid">Orbital</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a class="mw-selflink selflink">Group</a></li> <li><a href="/wiki/Asteroid_family" title="Asteroid family">Family</a></li> <li><i><a href="/wiki/Category:Asteroid_groups_and_families" title="Category:Asteroid groups and families">(list)</a></i></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Asteroid_spectral_types" title="Asteroid spectral types">Spectral</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Asteroid_spectral_types#Tholen_classification" title="Asteroid spectral types">Tholen</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/C-type_asteroid#C-group_(Tholen)" title="C-type asteroid">C-group</a> <ul><li><a href="/wiki/B-type_asteroid" title="B-type asteroid">B-type</a></li> <li><a href="/wiki/F-type_asteroid" title="F-type asteroid">F-type</a></li> <li><a href="/wiki/G-type_asteroid" title="G-type asteroid">G-type</a></li> <li><a href="/wiki/C-type_asteroid" title="C-type asteroid">C-type</a></li></ul></li> <li><a href="/wiki/S-type_asteroid" title="S-type asteroid">S-type</a></li> <li><a href="/wiki/X-type_asteroid" title="X-type asteroid">X-group</a> <ul><li><a href="/wiki/M-type_asteroid" title="M-type asteroid">M-type</a></li> <li><a href="/wiki/E-type_asteroid" title="E-type asteroid">E-type</a></li> <li><a href="/wiki/P-type_asteroid" title="P-type asteroid">P-type</a></li></ul></li></ul> <ul><li><i>small classes</i> <ul><li><a href="/wiki/A-type_asteroid" title="A-type asteroid">A-type</a></li> <li><a href="/wiki/D-type_asteroid" title="D-type asteroid">D-type</a></li> <li><a href="/wiki/J-type_asteroid" title="J-type asteroid">J-type</a></li> <li><a href="/wiki/T-type_asteroid" title="T-type asteroid">T-type</a></li> <li><a href="/wiki/Q-type_asteroid" title="Q-type asteroid">Q-type</a></li> <li><a href="/wiki/R-type_asteroid" title="R-type asteroid">R-type</a></li> <li><a href="/wiki/V-type_asteroid" title="V-type asteroid">V-type</a></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Asteroid_spectral_types#SMASS_classification" title="Asteroid spectral types">SMASS</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/C-type_asteroid#C-group_(SMASS)" title="C-type asteroid">C-group</a> <ul><li><a href="/wiki/B-type_asteroid" title="B-type asteroid">B-type</a></li> <li><a href="/wiki/C-type_asteroid" title="C-type asteroid">C-type</a></li> <li>Cg</li> <li>Ch</li> <li>Cgh</li> <li>Cb</li></ul></li> <li><a href="/wiki/S-type_asteroid" title="S-type asteroid">S-group</a> <ul><li><a href="/wiki/A-type_asteroid" title="A-type asteroid">A-type</a></li> <li><a href="/wiki/Q-type_asteroid" title="Q-type asteroid">Q-type</a></li> <li><a href="/wiki/R-type_asteroid" title="R-type asteroid">R-type</a></li> <li><a href="/wiki/K-type_asteroid" title="K-type asteroid">K-type</a></li> <li><a href="/wiki/L-type_asteroid" title="L-type asteroid">L-type</a></li> <li><a href="/wiki/S-type_asteroid" title="S-type asteroid">S-type</a></li> <li>Sa</li> <li>Sq</li> <li>Sr</li> <li>Sk</li> <li>Sl</li></ul></li></ul> <ul><li><a href="/wiki/X-type_asteroid" title="X-type asteroid">X-group</a> <ul><li><a href="/wiki/X-type_asteroid" title="X-type asteroid">X-type</a></li> <li>Xe</li> <li>Xc</li> <li>Xk</li></ul></li> <li><i>small types</i> <ul><li><a href="/wiki/T-type_asteroid" title="T-type asteroid">T-type</a></li> <li><a href="/wiki/D-type_asteroid" title="D-type asteroid">D-type</a></li> <li><a href="/wiki/L-type_asteroid#Ld-type_asteroids" title="L-type asteroid">Ld-type</a></li> <li><a href="/wiki/O-type_asteroid" title="O-type asteroid">O-type</a></li> <li><a href="/wiki/V-type_asteroid" title="V-type asteroid">V-type</a></li></ul></li></ul> </div></td></tr></tbody></table><div></div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Asteroid#Exploration" title="Asteroid">Exploration</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/List_of_minor_planets_and_comets_visited_by_spacecraft" title="List of minor planets and comets visited by spacecraft">Asteroids visited by spacecraft</a></li> <li><a href="/wiki/Asteroid_mining" title="Asteroid mining">Mining</a></li> <li><a href="/wiki/Asteroid_capture" title="Asteroid capture">Capture</a></li> <li><a href="/wiki/Colonization_of_the_asteroids" class="mw-redirect" title="Colonization of the asteroids">Colonization</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Category:Lists_of_asteroids" title="Category:Lists of asteroids">Lists</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/List_of_near-Earth_asteroids_by_distance_from_Sun" title="List of near-Earth asteroids by distance from Sun">Near-Earth</a></li> <li><a href="/wiki/List_of_minor_planets" title="List of minor planets">Minor planets</a></li> <li><a href="/wiki/Lost_minor_planet" title="Lost minor planet">Lost</a></li> <li><a href="/wiki/List_of_asteroid-discovering_observatories" title="List of asteroid-discovering observatories">Discovering observatories</a></li> <li><a href="/wiki/List_of_missions_to_minor_planets" title="List of missions to minor planets">Space missions</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Related</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Asteroid_Day" title="Asteroid Day">Asteroid Day</a></li> <li><a href="/wiki/Asteroids_in_fiction" title="Asteroids in fiction">Asteroids in fiction</a></li> <li><a href="/wiki/List_of_asteroids_in_astrology" class="mw-redirect" title="List of asteroids in astrology">Asteroids in astrology</a> <ul><li><a href="/wiki/Occultation#Occultations_by_smaller_bodies" title="Occultation">occultation</a></li></ul></li></ul> </div></td></tr><tr><td class="navbox-abovebelow hlist" colspan="2"><div> <ul><li><a href="/wiki/Comet" title="Comet">Comet</a></li> <li><a href="/wiki/Minor_planet" title="Minor planet">Minor planet</a></li></ul> <ul><li><span class="noviewer" typeof="mw:File"><span title="Category"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/16px-Symbol_category_class.svg.png" decoding="async" width="16" height="16" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/23px-Symbol_category_class.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/31px-Symbol_category_class.svg.png 2x" data-file-width="180" data-file-height="185" /></span></span> <a href="/wiki/Category:Asteroids" title="Category:Asteroids">Category</a></li></ul> </div></td></tr></tbody></table></div> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236075235"></div><div role="navigation" class="navbox" aria-labelledby="Small_Solar_System_bodies" style="padding:3px"><table class="nowraplinks hlist mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239400231"><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Small_Solar_System_bodies" title="Template:Small Solar System bodies"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Small_Solar_System_bodies" title="Template talk:Small Solar System bodies"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Small_Solar_System_bodies" title="Special:EditPage/Template:Small Solar System bodies"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Small_Solar_System_bodies" style="font-size:114%;margin:0 4em"><a href="/wiki/Small_Solar_System_body" title="Small Solar System body">Small Solar System bodies</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Minor_planet" title="Minor planet">Minor planets</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><td colspan="2" class="navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Minor-planet_designation" title="Minor-planet designation">Designation</a></li> <li><a class="mw-selflink selflink">Groups</a></li> <li><a href="/wiki/List_of_minor_planets" title="List of minor planets">List</a></li> <li><a href="/wiki/Minor-planet_moon" title="Minor-planet moon">Moon</a></li> <li><a href="/wiki/Meanings_of_minor-planet_names" title="Meanings of minor-planet names">Meanings of names</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:6em"><a href="/wiki/Asteroid" title="Asteroid">Asteroid</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Active_asteroid" title="Active asteroid">Active</a></li> <li><a href="/wiki/Aten_asteroid" title="Aten asteroid">Aten asteroid</a></li> <li><a href="/wiki/Asteroid_belt" title="Asteroid belt">Asteroid belt</a></li> <li><a href="/wiki/Asteroid_family" title="Asteroid family">Family</a></li> <li><a href="/wiki/Jupiter_trojan" title="Jupiter trojan">Jupiter trojan</a></li> <li><a href="/wiki/Near-Earth_object" title="Near-Earth object">Near-Earth</a></li> <li><a href="/wiki/Asteroid_spectral_types" title="Asteroid spectral types">Spectral types</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:6em"><a href="/wiki/Distant_minor_planet" title="Distant minor planet">Distant minor planet</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"> <ul><li><ul><li><a href="/wiki/Centaur_(small_Solar_System_body)" title="Centaur (small Solar System body)">Centaur</a></li> <li><a href="/wiki/Neptune_trojan" title="Neptune trojan">Neptune trojan</a></li></ul></li> <li><a href="/wiki/Damocloid" title="Damocloid">Damocloid</a></li> <li><a href="/wiki/Trans-Neptunian_object" title="Trans-Neptunian object">Trans-Neptunian object</a> <ul><li><a href="/wiki/Detached_object" title="Detached object">Detached</a></li> <li><a href="/wiki/Kuiper_belt" title="Kuiper belt">Kuiper belt</a></li> <li><a href="/wiki/Oort_cloud" title="Oort cloud">Oort cloud</a></li> <li><a href="/wiki/Scattered_disc" title="Scattered disc">Scattered disc</a></li></ul></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Comet" title="Comet">Comets</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Extinct_comet" title="Extinct comet">Extinct</a></li> <li><a href="/wiki/Great_comet" title="Great comet">Great</a></li> <li><a href="/wiki/List_of_Halley-type_comets" title="List of Halley-type comets">Halley-type</a></li> <li><a href="/wiki/List_of_hyperbolic_comets" title="List of hyperbolic comets">Hyperbolic</a></li> <li><a href="/wiki/List_of_long-period_comets" title="List of long-period comets">Long-period</a></li> <li><a href="/wiki/Lost_comet" title="Lost comet">Lost</a></li> <li><a href="/wiki/List_of_near-parabolic_comets" title="List of near-parabolic comets">Near-parabolic</a></li> <li><a href="/wiki/List_of_periodic_comets" title="List of periodic comets">Periodic</a></li> <li><a href="/wiki/Sungrazing_comet" title="Sungrazing comet">Sungrazing</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" 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