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href="https://de.wikipedia.org/wiki/Romulus_(Mond)" title="Romulus (Mond) – German" lang="de" hreflang="de" data-title="Romulus (Mond)" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/%CE%A1%CF%89%CE%BC%CF%8D%CE%BB%CE%BF%CF%82_(%CE%B4%CE%BF%CF%81%CF%85%CF%86%CF%8C%CF%81%CE%BF%CF%82)" title="Ρωμύλος (δορυφόρος) – Greek" lang="el" hreflang="el" data-title="Ρωμύλος (δορυφόρος)" data-language-autonym="Ελληνικά" data-language-local-name="Greek" class="interlanguage-link-target"><span>Ελληνικά</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D8%B1%D9%88%D9%85%D9%88%D9%84%D9%88%D8%B3_(%D9%82%D9%85%D8%B1)" title="رومولوس (قمر) – Persian" lang="fa" hreflang="fa" data-title="رومولوس (قمر)" data-language-autonym="فارسی" data-language-local-name="Persian" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Romulus_(lune)" title="Romulus (lune) – French" lang="fr" hreflang="fr" data-title="Romulus (lune)" 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/%EB%A1%9C%EB%AC%BC%EB%A3%A8%EC%8A%A4_(%EC%9C%84%EC%84%B1)" title="로물루스 (위성) – Korean" lang="ko" hreflang="ko" data-title="로물루스 (위성)" data-language-autonym="한국어" data-language-local-name="Korean" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-kv mw-list-item"><a href="https://kv.wikipedia.org/wiki/%D0%A0%D0%BE%D0%BC%D1%83%D0%BB_(%D0%A1%D0%B8%D0%BB%D1%8C%D0%B2%D0%B8%D1%8F%D0%BB%D3%A7%D0%BD_%D1%82%D3%A7%D0%BB%D1%8B%D1%81%D1%8C)" title="Ромул (Сильвиялӧн тӧлысь) – Komi" lang="kv" hreflang="kv" data-title="Ромул (Сильвиялӧн тӧлысь)" data-language-autonym="Коми" data-language-local-name="Komi" class="interlanguage-link-target"><span>Коми</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Romulus_(maan)" title="Romulus (maan) – Dutch" lang="nl" hreflang="nl" data-title="Romulus (maan)" data-language-autonym="Nederlands" data-language-local-name="Dutch" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E3%83%AD%E3%83%A0%E3%83%AB%E3%82%B9_(%E8%A1%9B%E6%98%9F)" title="ロムルス (衛星) – Japanese" lang="ja" hreflang="ja" data-title="ロムルス (衛星)" data-language-autonym="日本語" data-language-local-name="Japanese" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Romulus_(ksi%C4%99%C5%BCyc)" title="Romulus (księżyc) – Polish" lang="pl" hreflang="pl" data-title="Romulus (księżyc)" data-language-autonym="Polski" data-language-local-name="Polish" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/R%C3%B4mulo_(sat%C3%A9lite)" title="Rômulo (satélite) – Portuguese" lang="pt" hreflang="pt" data-title="Rômulo (satélite)" data-language-autonym="Português" data-language-local-name="Portuguese" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ro mw-list-item"><a href="https://ro.wikipedia.org/wiki/Romulus_(satelit)" title="Romulus (satelit) – Romanian" lang="ro" hreflang="ro" data-title="Romulus (satelit)" 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%A0%D0%BE%D0%BC%D1%83%D0%BB_(%D1%81%D0%BF%D1%83%D1%82%D0%BD%D0%B8%D0%BA)" title="Ромул (спутник) – Russian" lang="ru" hreflang="ru" data-title="Ромул (спутник)" data-language-autonym="Русский" data-language-local-name="Russian" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-sl mw-list-item"><a href="https://sl.wikipedia.org/wiki/Romul_(luna)" title="Romul (luna) – Slovenian" lang="sl" hreflang="sl" data-title="Romul (luna)" data-language-autonym="Slovenščina" data-language-local-name="Slovenian" class="interlanguage-link-target"><span>Slovenščina</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Romulus_(kuu)" title="Romulus (kuu) – Finnish" lang="fi" hreflang="fi" data-title="Romulus (kuu)" data-language-autonym="Suomi" data-language-local-name="Finnish" class="interlanguage-link-target"><span>Suomi</span></a></li><li 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<div class="mw-indicators"> </div> <div id="siteSub" class="noprint">From Wikipedia, the free encyclopedia</div> </div> <div id="contentSub"><div id="mw-content-subtitle"><span class="mw-redirectedfrom">(Redirected from <a href="/w/index.php?title=(87)_Sylvia_I_Romulus&redirect=no" class="mw-redirect" title="(87) Sylvia I Romulus">(87) Sylvia I Romulus</a>)</span></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">Larger moon of 87 Sylvia</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">Not to be confused with <a href="/wiki/10386_Romulus" class="mw-redirect" title="10386 Romulus">10386 Romulus</a>.</div> <p class="mw-empty-elt"> </p> <style data-mw-deduplicate="TemplateStyles:r1257001546">.mw-parser-output .infobox-subbox{padding:0;border:none;margin:-3px;width:auto;min-width:100%;font-size:100%;clear:none;float:none;background-color:transparent}.mw-parser-output .infobox-3cols-child{margin:auto}.mw-parser-output .infobox .navbar{font-size:100%}@media screen{html.skin-theme-clientpref-night .mw-parser-output .infobox-full-data:not(.notheme)>div:not(.notheme)[style]{background:#1f1f23!important;color:#f8f9fa}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .infobox-full-data:not(.notheme) div:not(.notheme){background:#1f1f23!important;color:#f8f9fa}}@media(min-width:640px){body.skin--responsive .mw-parser-output .infobox-table{display:table!important}body.skin--responsive .mw-parser-output .infobox-table>caption{display:table-caption!important}body.skin--responsive .mw-parser-output .infobox-table>tbody{display:table-row-group}body.skin--responsive .mw-parser-output .infobox-table tr{display:table-row!important}body.skin--responsive .mw-parser-output .infobox-table th,body.skin--responsive .mw-parser-output .infobox-table td{padding-left:inherit;padding-right:inherit}}</style><table class="infobox"><caption class="infobox-title fn org">Romulus</caption><tbody><tr><td colspan="2" class="infobox-image"><span class="mw-default-size" typeof="mw:File/Frameless"><a href="/wiki/File:CMSylvia.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/5/52/CMSylvia.png/290px-CMSylvia.png" decoding="async" width="290" height="267" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/5/52/CMSylvia.png 1.5x" data-file-width="386" data-file-height="355" /></a></span><div class="infobox-caption">Adaptive Optics observations of (87) Sylvia, showing its two satellites, <a href="/wiki/Remus_(moon)" title="Remus (moon)">Remus</a> and Romulus.</div></td></tr><tr><th colspan="2" class="infobox-header" style="background-color:#A0FFA0">Discovery<sup id="cite_ref-IAUC7588_1-0" class="reference"><a href="#cite_note-IAUC7588-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup></th></tr><tr><th scope="row" class="infobox-label" style="max-width:11em;"><a href="/wiki/List_of_minor_planet_discoverers" title="List of minor planet discoverers">Discovered by</a></th><td class="infobox-data"><style data-mw-deduplicate="TemplateStyles:r1126788409">.mw-parser-output .plainlist ol,.mw-parser-output .plainlist ul{line-height:inherit;list-style:none;margin:0;padding:0}.mw-parser-output .plainlist ol li,.mw-parser-output .plainlist ul li{margin-bottom:0}</style><div class="plainlist"><ul><li><a href="/wiki/Michael_E._Brown" title="Michael E. Brown">Michael E. Brown</a></li><li><a href="/wiki/Jean-Luc_Margot" title="Jean-Luc Margot">Jean-Luc Margot</a></li></ul></div></td></tr><tr><th scope="row" class="infobox-label" style="max-width:11em;">Discovery date</th><td class="infobox-data">18 February 2001</td></tr><tr><th colspan="2" class="infobox-header" style="background-color:#A0FFA0">Designations</th></tr><tr><th scope="row" class="infobox-label" style="max-width:11em;"><div style="display: inline-block; line-height: 1.2em; padding: .1em 0;"><a href="/wiki/Minor-planet_designation" title="Minor-planet designation">MPC designation</a></div></th><td class="infobox-data">Sylvia I</td></tr><tr><th scope="row" class="infobox-label" style="max-width:11em;">Pronunciation</th><td class="infobox-data"><span class="rt-commentedText nowrap"><span class="IPA nopopups noexcerpt" lang="en-fonipa"><a href="/wiki/Help:IPA/English" title="Help:IPA/English">/<span style="border-bottom:1px dotted"><span title="/ˈ/: primary stress follows">ˈ</span><span title="'r' in 'rye'">r</span><span title="/ɒ/: 'o' in 'body'">ɒ</span><span title="'m' in 'my'">m</span><span title="/j/: 'y' in 'yes'">j</span><span title="/ʊ/: 'u' in 'push'">ʊ</span><span title="'l' in 'lie'">l</span><span title="/ə/: 'a' in 'about'">ə</span><span title="'s' in 'sigh'">s</span></span>/</a></span></span></td></tr><tr><th scope="row" class="infobox-label" style="max-width:11em;"><div style="display: inline-block; line-height: 1.2em; padding: .1em 0;">Named after</div></th><td class="infobox-data"><a href="/wiki/Romulus" title="Romulus">Rōmulus</a></td></tr><tr><th scope="row" class="infobox-label" style="max-width:11em;"><div style="display: inline-block; line-height: 1.2em; padding: .1em 0;"><a href="/wiki/Provisional_designation_in_astronomy" title="Provisional designation in astronomy">Alternative designations</a></div></th><td class="infobox-data"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1126788409"><div class="plainlist"><ul><li>(87) Sylvia I Romulus</li><li>S/2001 (87) 1</li></ul></div></td></tr><tr><th scope="row" class="infobox-label" style="max-width:11em;"><div style="display: inline-block; line-height: 1.2em; padding: .1em 0;"><a href="/wiki/Minor_planet#Populations" title="Minor planet">Minor planet category</a></div></th><td class="infobox-data"><a href="/wiki/Main_belt" class="mw-redirect" title="Main belt">Main belt</a> (<a href="/wiki/Cybele_asteroid" class="mw-redirect" title="Cybele asteroid">Cybele</a>)</td></tr><tr><th scope="row" class="infobox-label" style="max-width:11em;"><a href="/wiki/List_of_adjectivals_and_demonyms_of_astronomical_bodies" title="List of adjectivals and demonyms of astronomical bodies">Adjectives</a></th><td class="infobox-data">Romulian,<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> -ean<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> <br />(both <span class="rt-commentedText nowrap"><span class="IPA nopopups noexcerpt" lang="en-fonipa"><a href="/wiki/Help:IPA/English" title="Help:IPA/English">/<span style="border-bottom:1px dotted"><span title="'r' in 'rye'">r</span><span title="/ɒ/: 'o' in 'body'">ɒ</span><span title="/ˈ/: primary stress follows">ˈ</span><span title="'m' in 'my'">m</span><span title="/juː/: 'u' in 'cute'">juː</span><span title="'l' in 'lie'">l</span><span title="/i/: 'y' in 'happy'">i</span><span title="/ə/: 'a' in 'about'">ə</span><span title="'n' in 'nigh'">n</span></span>/</a></span></span>)</td></tr><tr><th colspan="2" class="infobox-header" style="background-color:#A0FFA0"><a href="/wiki/Osculating_orbit" title="Osculating orbit">Orbital characteristics</a><sup id="cite_ref-J.Fang,J.Margot,P.Rojo2012_4-0" class="reference"><a href="#cite_note-J.Fang,J.Margot,P.Rojo2012-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup></th></tr><tr><td colspan="2" class="infobox-full-data"><a href="/wiki/Epoch_(astronomy)" title="Epoch (astronomy)">Epoch</a> 1 September 2004 (<a href="/wiki/Julian_day" title="Julian day">JD</a> 1795812.5)</td></tr><tr><th scope="row" class="infobox-label" style="max-width:11em;"><div style="display: inline-block; line-height: 1.2em; padding: .1em 0;"><a href="/wiki/Semi-major_and_semi-minor_axes" title="Semi-major and semi-minor axes">Semi-major axis</a></div></th><td class="infobox-data"><span class="nowrap"><span data-sort-value="7006135135000000000♠"></span>1<span style="margin-left:.25em;">351</span>.35<span style="margin-left:0.3em;margin-right:0.15em;">±</span>0.1 <a href="/wiki/Kilometre" title="Kilometre">km</a></span></td></tr><tr><th scope="row" class="infobox-label" style="max-width:11em;"><a href="/wiki/Orbital_eccentricity" title="Orbital eccentricity">Eccentricity</a></th><td class="infobox-data"><span class="nowrap"><span data-sort-value="6997690000000000000♠"></span>0.0069<span style="margin-left:0.3em;margin-right:0.15em;">±</span>0.0037</span></td></tr><tr><th scope="row" class="infobox-label" style="max-width:11em;"><div style="display: inline-block; line-height: 1.2em; padding: .1em 0;"><a href="/wiki/Orbital_period" title="Orbital period">Orbital period (sidereal)</a></div></th><td class="infobox-data"><span class="nowrap"><span data-sort-value="7005315325440000000♠"></span>3.6496<span style="margin-left:0.3em;"><span style="display:inline-block;margin-bottom:-0.3em;vertical-align:-0.4em;line-height:1.2em;font-size:85%;text-align:right;">+0.025<br />−0.024</span></span> <a href="/wiki/Day" title="Day">d</a></span></td></tr><tr><th scope="row" class="infobox-label" style="max-width:11em;"><div style="display: inline-block; line-height: 1.2em; padding: .1em 0;">Average <a href="/wiki/Orbital_speed" title="Orbital speed">orbital speed</a></div></th><td class="infobox-data">27.0 m/s</td></tr><tr><th scope="row" class="infobox-label" style="max-width:11em;"><div style="display: inline-block; line-height: 1.2em; padding: .1em 0;"><a href="/wiki/Mean_anomaly#Mean_anomaly_at_epoch" title="Mean anomaly">Mean anomaly</a></div></th><td class="infobox-data"><span class="nowrap"><span data-sort-value="7000291469985083053♠"></span>167<a href="/wiki/Degree_(angle)" title="Degree (angle)">°</a><span style="margin-left:0.3em;margin-right:0.15em;">±</span>23<a href="/wiki/Degree_(angle)" title="Degree (angle)">°</a></span></td></tr><tr><th scope="row" class="infobox-label" style="max-width:11em;"><a href="/wiki/Orbital_inclination" title="Orbital inclination">Inclination</a></th><td class="infobox-data"><span class="nowrap"><span data-sort-value="6998296705972839036♠"></span>1.7°<span style="margin-left:0.3em;margin-right:0.15em;">±</span>1.0°</span><br />(with respect to Sylvia equator)</td></tr><tr><th scope="row" class="infobox-label" style="max-width:11em;"><div style="display: inline-block; line-height: 1.2em; padding: .1em 0;"><a href="/wiki/Longitude_of_the_ascending_node" title="Longitude of the ascending node">Longitude of ascending node</a></div></th><td class="infobox-data"><span class="nowrap"><span data-sort-value="7000162612326408312♠"></span>93.17°<span style="margin-left:0.3em;margin-right:0.15em;">±</span>1.85°</span></td></tr><tr><th scope="row" class="infobox-label" style="max-width:11em;"><div style="display: inline-block; line-height: 1.2em; padding: .1em 0;"><a href="/wiki/Argument_of_periapsis" title="Argument of periapsis">Argument of perihelion</a></div></th><td class="infobox-data"><span class="nowrap"><span data-sort-value="7000305432619099008♠"></span>175°<span style="margin-left:0.3em;margin-right:0.15em;">±</span>23°</span></td></tr><tr><th scope="row" class="infobox-label" style="max-width:11em;"><a href="/wiki/Natural_satellite" title="Natural satellite">Satellite of</a></th><td class="infobox-data"><a href="/wiki/87_Sylvia" title="87 Sylvia">87 Sylvia</a></td></tr><tr><th colspan="2" class="infobox-header" style="background-color:#A0FFA0"><span class="anchor" id="Infobox_Physical_characteristics"></span><a href="/wiki/Standard_asteroid_physical_characteristics" title="Standard asteroid physical characteristics">Physical characteristics</a></th></tr><tr><th scope="row" class="infobox-label" style="max-width:11em;"><a href="/wiki/Mean_radius_(astronomy)" title="Mean radius (astronomy)">Dimensions</a></th><td class="infobox-data"><span class="nowrap"><span data-sort-value="7004108000000000000♠"></span>10.8<span style="margin-left:0.3em;margin-right:0.15em;">±</span>5.6 km</span><sup id="cite_ref-J.Fang,J.Margot,P.Rojo2012_4-1" class="reference"><a href="#cite_note-J.Fang,J.Margot,P.Rojo2012-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup></td></tr><tr><th scope="row" class="infobox-label" style="max-width:11em;"><a href="/wiki/Mass" title="Mass">Mass</a></th><td class="infobox-data"><span class="nowrap"><span data-sort-value="7014931900000000000♠"></span>9.319<span style="margin-left:0.3em;"><span style="display:inline-block;margin-bottom:-0.3em;vertical-align:-0.4em;line-height:1.2em;font-size:85%;text-align:right;">+20.7<br />−8.3</span></span><span style="margin-left:0.25em;margin-right:0.15em;">×</span>10<sup>14</sup> kg</span><sup id="cite_ref-J.Fang,J.Margot,P.Rojo2012_4-2" class="reference"><a href="#cite_note-J.Fang,J.Margot,P.Rojo2012-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup></td></tr><tr><th scope="row" class="infobox-label" style="max-width:11em;"><div style="display: inline-block; line-height: 1.2em; padding: .1em 0;">Equatorial <a href="/wiki/Escape_velocity" title="Escape velocity">escape velocity</a></div></th><td class="infobox-data">~ 4.8 m/s <i>(estimate)</i> <sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (March 2022)">citation needed</span></a></i>]</sup></td></tr><tr><th scope="row" class="infobox-label" style="max-width:11em;"><div style="display: inline-block; line-height: 1.2em; padding: .1em 0;"><a href="/wiki/Absolute_magnitude#Solar_System_bodies_(H)" title="Absolute magnitude">Absolute magnitude <i>(H)</i></a></div></th><td class="infobox-data">10.7<sup id="cite_ref-Marchis05_5-0" class="reference"><a href="#cite_note-Marchis05-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup></td></tr><tr><td colspan="2" class="infobox-below"><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></td></tr></tbody></table> <p><b>Romulus</b> is the outer and larger moon of the <a href="/wiki/Main-belt_asteroid" class="mw-redirect" title="Main-belt asteroid">main-belt asteroid</a> <a href="/wiki/87_Sylvia" title="87 Sylvia">87 Sylvia</a>. It follows an almost-circular and close-to-equatorial orbit around the asteroid. In this respect it is similar to the other Sylvian moon <a href="/wiki/Remus_(moon)" title="Remus (moon)">Remus</a>. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Discovery_and_naming">Discovery and naming</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Romulus_(moon)&action=edit&section=1" title="Edit section: Discovery and naming"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Romulus was discovered in February 2001 from the <a href="/wiki/Keck_telescope" class="mw-redirect" title="Keck telescope">Keck II telescope</a> by <a href="/wiki/Michael_E._Brown" title="Michael E. Brown">Michael E. Brown</a> and <a href="/wiki/Jean-Luc_Margot" title="Jean-Luc Margot">Jean-Luc Margot</a>. Its full designation is <b>(87) Sylvia I Romulus</b>; before receiving its name, it was known as <b>S/2001 (87) 1</b>. The moon is named after <a href="/wiki/Romulus_and_Remus" title="Romulus and Remus">Romulus</a>, the mythological founder of <a href="/wiki/Rome" title="Rome">Rome</a>, one of the twins of <a href="/wiki/Rhea_Silvia" title="Rhea Silvia">Rhea Silvia</a> raised by a wolf. </p> <div class="mw-heading mw-heading2"><h2 id="Characteristics">Characteristics</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Romulus_(moon)&action=edit&section=2" title="Edit section: Characteristics"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>87 Sylvia has a low density, which indicates that it is probably a <a href="/wiki/Rubble_pile" title="Rubble pile">rubble pile</a> formed when debris from a collision between its parent body and another asteroid re-accreted gravitationally. Therefore, it is likely that both Romulus and <a href="/wiki/Remus_(moon)" title="Remus (moon)">Remus</a>, the second of Sylvia's moons, are smaller rubble piles which accreted in orbit around the main body from debris of the same collision. In this case their albedo and density are expected to be similar to Sylvia's.<sup id="cite_ref-Marchis05_5-1" class="reference"><a href="#cite_note-Marchis05-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> </p><p>Romulus's orbit is expected to be quite stable − it lies far inside Sylvia's <a href="/wiki/Hill_sphere" title="Hill sphere">Hill sphere</a> (about 1/50 of Sylvia's <a href="/wiki/Hill_radius" class="mw-redirect" title="Hill radius">Hill radius</a>), but also far outside the <a href="/wiki/Synchronous_orbit" title="Synchronous orbit">synchronous orbit</a>.<sup id="cite_ref-Marchis05_5-2" class="reference"><a href="#cite_note-Marchis05-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> </p><p>From Romulus's surface, Sylvia takes up an angular region 16°×10° across, while Remus's apparent size varies between 0.62° and 0.19° (for comparison, Earth's <a href="/wiki/Moon" title="Moon">Moon</a> has an apparent size of about 0.5°). </p> <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=Romulus_(moon)&action=edit&section=3" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Remus_(moon)" title="Remus (moon)">Remus (moon)</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=Romulus_(moon)&action=edit&section=4" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239543626"><div class="reflist"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-IAUC7588-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-IAUC7588_1-0">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.cbat.eps.harvard.edu/iauc/07500/07588.html">IAUC 7588</a>, announcing the discovery of S/2001 (87) 1</span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text">Clark (1919) <i>History of Roman private law,</i> v. 3</span> </li> <li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text"><a href="/wiki/Francisco_Rodr%C3%ADguez_Adrados" title="Francisco Rodríguez Adrados">Rodríguez-Adrados</a>, van Dijk, & Ray (2000) <i>History of the Graeco-Latin Fable</i></span> </li> <li id="cite_note-J.Fang,J.Margot,P.Rojo2012-4"><span class="mw-cite-backlink">^ <a href="#cite_ref-J.Fang,J.Margot,P.Rojo2012_4-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-J.Fang,J.Margot,P.Rojo2012_4-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-J.Fang,J.Margot,P.Rojo2012_4-2"><sup><i><b>c</b></i></sup></a></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 .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite id="CITEREFFangMargotRojo2012" class="citation journal cs1">Fang, Julia; Margot, Jean-Luc; Rojo, Patricio (16 July 2012). "Orbits, Masses, and Evolution of Main Belt Triple (87) Sylvia". <i>The Astronomical Journal</i>. <b>144</b> (2): 70. <a href="/wiki/ArXiv_(identifier)" class="mw-redirect" title="ArXiv (identifier)">arXiv</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://arxiv.org/abs/1206.5755">1206.5755</a></span>. <a href="/wiki/Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/2012AJ....144...70F">2012AJ....144...70F</a>. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1088%2F0004-6256%2F144%2F2%2F70">10.1088/0004-6256/144/2/70</a>. <a href="/wiki/S2CID_(identifier)" class="mw-redirect" title="S2CID (identifier)">S2CID</a> <a rel="nofollow" class="external text" href="https://api.semanticscholar.org/CorpusID:55173059">55173059</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=The+Astronomical+Journal&rft.atitle=Orbits%2C+Masses%2C+and+Evolution+of+Main+Belt+Triple+%2887%29+Sylvia&rft.volume=144&rft.issue=2&rft.pages=70&rft.date=2012-07-16&rft_id=info%3Aarxiv%2F1206.5755&rft_id=https%3A%2F%2Fapi.semanticscholar.org%2FCorpusID%3A55173059%23id-name%3DS2CID&rft_id=info%3Adoi%2F10.1088%2F0004-6256%2F144%2F2%2F70&rft_id=info%3Abibcode%2F2012AJ....144...70F&rft.aulast=Fang&rft.aufirst=Julia&rft.au=Margot%2C+Jean-Luc&rft.au=Rojo%2C+Patricio&rfr_id=info%3Asid%2Fen.wikipedia.org%3ARomulus+%28moon%29" class="Z3988"></span></span> </li> <li id="cite_note-Marchis05-5"><span class="mw-cite-backlink">^ <a href="#cite_ref-Marchis05_5-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-Marchis05_5-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-Marchis05_5-2"><sup><i><b>c</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFF._Marchis2005" class="citation journal cs1">F. Marchis; et al. (2005). <a rel="nofollow" class="external text" href="http://www.escholarship.org/uc/item/7nb376hk">"<i>Discovery of the triple asteroidal system 87 Sylvia</i>"</a>. <i>Nature</i>. <b>436</b> (7052): 822–4. <a href="/wiki/Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/2005Natur.436..822M">2005Natur.436..822M</a>. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1038%2Fnature04018">10.1038/nature04018</a>. <a href="/wiki/PMID_(identifier)" class="mw-redirect" title="PMID (identifier)">PMID</a> <a rel="nofollow" class="external text" href="https://pubmed.ncbi.nlm.nih.gov/16094362">16094362</a>. <a href="/wiki/S2CID_(identifier)" class="mw-redirect" title="S2CID (identifier)">S2CID</a> <a rel="nofollow" class="external text" href="https://api.semanticscholar.org/CorpusID:4412813">4412813</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Nature&rft.atitle=Discovery+of+the+triple+asteroidal+system+87+Sylvia&rft.volume=436&rft.issue=7052&rft.pages=822-4&rft.date=2005&rft_id=info%3Adoi%2F10.1038%2Fnature04018&rft_id=https%3A%2F%2Fapi.semanticscholar.org%2FCorpusID%3A4412813%23id-name%3DS2CID&rft_id=info%3Apmid%2F16094362&rft_id=info%3Abibcode%2F2005Natur.436..822M&rft.au=F.+Marchis&rft_id=http%3A%2F%2Fwww.escholarship.org%2Fuc%2Fitem%2F7nb376hk&rfr_id=info%3Asid%2Fen.wikipedia.org%3ARomulus+%28moon%29" class="Z3988"></span></span> </li> </ol></div></div> <div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Romulus_(moon)&action=edit&section=5" 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="http://www.johnstonsarchive.net/astro/astmoons/am-00087.html">Data on (87) Sylvia from Johnston's archive</a> (maintained by W. R. Johnston)</li> <li><i><a rel="nofollow" class="external text" href="http://adsabs.harvard.edu/abs/2005eso..pres...21.">Rubble-Pile Minor Planet Sylvia and Her Twins</a></i> (ESO news release, August 2005) Includes images and artists impressions</li> <li><i><a rel="nofollow" class="external text" href="http://www.spacedaily.com/news/asteroid-01b.html">Adaptive Optics System Reveals New Asteroidal Satellite</a></i> (SpaceDaily.com, March 2001) Includes a discovery image.</li> <li><a rel="nofollow" class="external text" href="http://www.cbat.eps.harvard.edu/iauc/07500/07590.html">IAUC 7590</a>, confirming the discovery of S/2001 (87) 1</li> <li><a rel="nofollow" class="external text" href="http://www.cbat.eps.harvard.edu/iauc/08500/08582.html">IAUC 8582</a>, reporting discovery of S/2004 (87) 1 and naming Romulus and Remus</li></ul> <div class="navbox-styles"><style data-mw-deduplicate="TemplateStyles:r1129693374">.mw-parser-output .hlist dl,.mw-parser-output .hlist ol,.mw-parser-output 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