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class="firstHeading mw-first-heading"><span class="mw-page-title-main">Actaea (moon)</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. 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href="https://el.wikipedia.org/wiki/%CE%91%CE%BA%CF%84%CE%B1%CE%AF%CE%B1_(%CE%B4%CE%BF%CF%81%CF%85%CF%86%CF%8C%CF%81%CE%BF%CF%82)" title="Ακταία (δορυφόρος) – Greek" lang="el" hreflang="el" data-title="Ακταία (δορυφόρος)" data-language-autonym="Ελληνικά" data-language-local-name="Greek" class="interlanguage-link-target"><span>Ελληνικά</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Actaea_(sat%C3%A9lite)" title="Actaea (satélite) – Spanish" lang="es" hreflang="es" data-title="Actaea (satélite)" data-language-autonym="Español" data-language-local-name="Spanish" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-eo mw-list-item"><a href="https://eo.wikipedia.org/wiki/Aktaeo_(luno)" title="Aktaeo (luno) – Esperanto" lang="eo" hreflang="eo" data-title="Aktaeo (luno)" data-language-autonym="Esperanto" data-language-local-name="Esperanto" class="interlanguage-link-target"><span>Esperanto</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Act%C3%A9e_(lune)" title="Actée (lune) – French" lang="fr" hreflang="fr" data-title="Actée (lune)" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-kv mw-list-item"><a href="https://kv.wikipedia.org/wiki/%D0%90%D0%BA%D1%82%D0%B5%D1%8F" title="Актея – Komi" lang="kv" hreflang="kv" data-title="Актея" 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/Actaea_(maan)" title="Actaea (maan) – Dutch" lang="nl" hreflang="nl" data-title="Actaea (maan)" data-language-autonym="Nederlands" data-language-local-name="Dutch" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Actaea_(ksi%C4%99%C5%BCyc)" title="Actaea (księżyc) – Polish" lang="pl" hreflang="pl" data-title="Actaea (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/Actaea_(sat%C3%A9lite)" title="Actaea (satélite) – Portuguese" lang="pt" hreflang="pt" data-title="Actaea (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/Actaea_(satelit)" title="Actaea (satelit) – Romanian" lang="ro" hreflang="ro" data-title="Actaea (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%90%D0%BA%D1%82%D0%B5%D1%8F_(%D1%81%D0%BF%D1%83%D1%82%D0%BD%D0%B8%D0%BA)" title="Актея (спутник) – Russian" lang="ru" hreflang="ru" data-title="Актея (спутник)" data-language-autonym="Русский" data-language-local-name="Russian" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Actaea_(kuu)" title="Actaea (kuu) – Finnish" lang="fi" hreflang="fi" data-title="Actaea (kuu)" data-language-autonym="Suomi" data-language-local-name="Finnish" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Actaea_(m%C3%A5ne)" title="Actaea (måne) – Swedish" lang="sv" hreflang="sv" data-title="Actaea (måne)" data-language-autonym="Svenska" data-language-local-name="Swedish" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/Actaea_(v%E1%BB%87_tinh)" title="Actaea (vệ tinh) – Vietnamese" lang="vi" hreflang="vi" data-title="Actaea (vệ tinh)" data-language-autonym="Tiếng Việt" data-language-local-name="Vietnamese" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/Actaea_(%E5%8D%AB%E6%98%9F)" title="Actaea (卫星) – Chinese" lang="zh" hreflang="zh" data-title="Actaea (卫星)" data-language-autonym="中文" data-language-local-name="Chinese" class="interlanguage-link-target"><span>中文</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a 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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">Actaea</caption><tbody><tr><td colspan="2" class="infobox-image"><span class="mw-default-size" typeof="mw:File/Frameless"><a href="/wiki/File:Salacia_and_Actaea_Keck-NIRC2_brightened.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/1/18/Salacia_and_Actaea_Keck-NIRC2_brightened.jpg/290px-Salacia_and_Actaea_Keck-NIRC2_brightened.jpg" decoding="async" width="290" height="290" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/18/Salacia_and_Actaea_Keck-NIRC2_brightened.jpg/435px-Salacia_and_Actaea_Keck-NIRC2_brightened.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/1/18/Salacia_and_Actaea_Keck-NIRC2_brightened.jpg 2x" data-file-width="492" data-file-height="492" /></a></span><div class="infobox-caption">Salacia and its moon Actaea, imaged by the Keck telescope on 3 August 2010. Actaea is the fainter object to the left of Salacia.</div></td></tr><tr><th colspan="2" class="infobox-header" style="background-color:#E0CCFF">Discovery</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">Keith S. Noll, Harold F. Levison, Denise C. Stephen, William M. Grundy</td></tr><tr><th scope="row" class="infobox-label" style="max-width:11em;">Discovery date</th><td class="infobox-data">21 July 2006</td></tr><tr><th colspan="2" class="infobox-header" style="background-color:#E0CCFF">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;">Designation</div></th><td class="infobox-data">Salacia 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="/æ/: 'a' in 'bad'">æ</span><span title="'k' in 'kind'">k</span><span title="/ˈ/: primary stress follows">ˈ</span><span title="'t' in 'tie'">t</span><span title="/iː/: 'ee' in 'fleece'">iː</span><span title="/ə/: 'a' in 'about'">ə</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;"><a href="/wiki/Provisional_designation_in_astronomy" title="Provisional designation in astronomy">Alternative names</a></div></th><td class="infobox-data">S/2006 (120347) 1</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">Actaean <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="/æ/: 'a' in 'bad'">æ</span><span title="'k' in 'kind'">k</span><span title="/ˈ/: primary stress follows">ˈ</span><span title="'t' in 'tie'">t</span><span title="/iː/: 'ee' in 'fleece'">iː</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:#E0CCFF"><a href="/wiki/Osculating_orbit" title="Osculating orbit">Orbital characteristics</a><sup id="cite_ref-Grundy-orbits_1-0" class="reference"><a href="#cite_note-Grundy-orbits-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;"><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="7003572400000000000♠"></span>5724<span style="margin-left:0.3em;margin-right:0.15em;">±</span>27</span> km</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="6997980000000000000♠"></span>0.0098<span style="margin-left:0.3em;margin-right:0.15em;">±</span>0.0038</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="7000549388200000000♠"></span>5.493<span style="margin-left:.25em;">882</span><span style="margin-left:0.3em;margin-right:0.15em;">±</span>0.000<span style="margin-left:.25em;">023</span></span> days</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="7001235900000000000♠"></span>23.59<span style="margin-left:0.3em;margin-right:0.15em;">±</span>0.36</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/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="7001452000000000000♠"></span>45.2<span style="margin-left:0.3em;margin-right:0.15em;">±</span>1.6</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="7002134000000000000♠"></span>134<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/120347_Salacia" title="120347 Salacia">Salacia</a></td></tr><tr><th colspan="2" class="infobox-header" style="background-color:#E0CCFF"><span class="anchor" id="Infobox_Physical_characteristics"></span>Physical characteristics</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="7005284000000000000♠"></span>284<span style="margin-left:0.3em;margin-right:0.15em;">±</span>10 km</span><sup id="cite_ref-Grundy-orbits_1-1" class="reference"><a href="#cite_note-Grundy-orbits-1"><span class="cite-bracket">[</span>1<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="7019200000000000000♠"></span>20<span style="margin-left:0.25em;margin-right:0.15em;">×</span>10<sup>18</sup> kg</span></td></tr><tr><th scope="row" class="infobox-label" style="max-width:11em;"><a href="/wiki/Albedo" title="Albedo">Albedo</a></th><td class="infobox-data">≈ 0.035 +0.010/−0.007<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. (October 2019)">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;">Spectral type</div></th><td class="infobox-data"><a href="/wiki/Trans-Neptunian_object#Spectral_type" title="Trans-Neptunian object">V–I</a> = <span class="nowrap"><span data-sort-value="6999890000000000000♠"></span>0.89<span style="margin-left:0.3em;margin-right:0.15em;">±</span>0.02</span> (Actaea)</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">1.9 mag<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. (October 2019)">citation needed</span></a></i>]</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>Actaea</b>, officially <b>(120347)</b> <b>Salacia I Actaea</b>, is a <a href="/wiki/Natural_satellite" title="Natural satellite">natural satellite</a> of the <a href="/wiki/Classical_Kuiper_belt_object" title="Classical Kuiper belt object">classical Kuiper belt</a> object <a href="/wiki/120347_Salacia" title="120347 Salacia">120347 Salacia</a>. Its diameter is estimated to be approximately 300 km (190 mi), which is approximately one-third the diameter of Salacia; thus, Salacia and Actaea are viewed by William Grundy et al. to be a <a href="/wiki/Binary_asteroid" title="Binary asteroid">binary system</a>. Assuming that the following size estimates are correct, Actaea is about the sixth-biggest known moon of a trans-Neptunian object, after <a href="/wiki/Charon_(moon)" title="Charon (moon)">Charon</a> (1212 km), <a href="/wiki/Dysnomia_(moon)" title="Dysnomia (moon)">Dysnomia</a> (700 km),<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> <a href="/wiki/Vanth_(moon)" title="Vanth (moon)">Vanth</a> (443 km),<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> <a href="/wiki/Ilmar%C3%AB_(moon)" class="mw-redirect" title="Ilmarë (moon)">Ilmarë</a> (326 km),<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> and <a href="/wiki/Hi%CA%BBiaka_(moon)" title="Hiʻiaka (moon)">Hiʻiaka</a> (320 km), but possibly also <a href="/wiki/Hiisi_(moon)" class="mw-redirect" title="Hiisi (moon)">Hiisi</a> (250 km). </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Discovery_and_name">Discovery and name</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Actaea_(moon)&action=edit&section=1" title="Edit section: Discovery and name"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>It was discovered on 21 July 2006 by Keith S. Noll, <a href="/wiki/Harold_Levison" class="mw-redirect" title="Harold Levison">Harold Levison</a>, <a href="/wiki/Denise_Stephens" title="Denise Stephens">Denise Stephens</a>, and Will Grundy with the <a href="/wiki/Hubble_Space_Telescope" title="Hubble Space Telescope">Hubble Space Telescope</a>.<sup id="cite_ref-IAUC8751_5-0" class="reference"><a href="#cite_note-IAUC8751-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> On 18 February 2011, it was officially named Actaea after the <a href="/wiki/Nereid" class="mw-redirect" title="Nereid">Nereid</a> nymph named <a href="/wiki/Actaea_(Greek_myth)" class="mw-redirect" title="Actaea (Greek myth)">Actaea</a>. </p> <div class="mw-heading mw-heading2"><h2 id="Orbit">Orbit</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Actaea_(moon)&action=edit&section=2" title="Edit section: Orbit"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size mw-halign-left" typeof="mw:File/Thumb"><a href="/wiki/File:Salacia_Actaea_orbit_simulation.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/4/4b/Salacia_Actaea_orbit_simulation.png/170px-Salacia_Actaea_orbit_simulation.png" decoding="async" width="170" height="107" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/4b/Salacia_Actaea_orbit_simulation.png/255px-Salacia_Actaea_orbit_simulation.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/4b/Salacia_Actaea_orbit_simulation.png/340px-Salacia_Actaea_orbit_simulation.png 2x" data-file-width="845" data-file-height="534" /></a><figcaption>Schematic of Actaea's orbit relative to Salacia</figcaption></figure> <p>Actaea orbits its primary every <span class="nowrap"><span data-sort-value="7005474595200000000♠"></span>5.493 d</span> at a distance of <span class="nowrap"><span data-sort-value="7006561900000000000♠"></span>5619<span style="margin-left:0.3em;margin-right:0.15em;">±</span>87 km</span> and with an eccentricity of <span class="nowrap"><span data-sort-value="6997840000000000000♠"></span>0.0084<span style="margin-left:0.3em;margin-right:0.15em;">±</span>0.0076</span>.<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> The ratio of its semi-major axis to its primary's Hill radius is 0.0023, the tightest trans-Neptunian binary with a known orbit.<sup id="cite_ref-Stansberry-result_7-0" class="reference"><a href="#cite_note-Stansberry-result-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Physical_characteristics">Physical characteristics</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Actaea_(moon)&action=edit&section=3" title="Edit section: Physical characteristics"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The mass of the system is <span class="nowrap"><span data-sort-value="7020492000000000000♠"></span>(4.92<span style="margin-left:0.3em;margin-right:0.15em;">±</span>0.07)<span style="margin-left:0.25em;margin-right:0.15em;">×</span>10<sup>20</sup> kg</span>, with Actaea constituting perhaps 4% of this.<sup id="cite_ref-Grundy-orbits_1-2" class="reference"><a href="#cite_note-Grundy-orbits-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> Actaea is <span class="nowrap"><span data-sort-value="7000237200000000000♠"></span>2.372<span style="margin-left:0.3em;margin-right:0.15em;">±</span>0.060</span> magnitudes fainter than Salacia, implying a diameter ratio of 2.98 for equal albedos.<sup id="cite_ref-Stansberry-result_7-1" class="reference"><a href="#cite_note-Stansberry-result-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> Hence, assuming equal albedos, it has a diameter of <span class="nowrap"><span data-sort-value="7005284000000000000♠"></span>284<span style="margin-left:0.3em;margin-right:0.15em;">±</span>10 km</span>.<sup id="cite_ref-Grundy-orbits_1-3" class="reference"><a href="#cite_note-Grundy-orbits-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> Actaea has the same color as Salacia (V−I = <span class="nowrap"><span data-sort-value="6999890000000000000♠"></span>0.89<span style="margin-left:0.3em;margin-right:0.15em;">±</span>0.02</span> and <span class="nowrap"><span data-sort-value="6999870000000000000♠"></span>0.87<span style="margin-left:0.3em;margin-right:0.15em;">±</span>0.01</span>, respectively), supporting the assumption of equal albedos.<sup id="cite_ref-Stansberry-result_7-2" class="reference"><a href="#cite_note-Stansberry-result-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> It has been calculated that the Salacia system should have undergone enough <a href="/wiki/Tide" title="Tide">tidal</a> evolution to circularize their orbits, which is consistent with the low measured eccentricity, but that the primary need not be tidally locked.<sup id="cite_ref-Stansberry-result_7-3" class="reference"><a href="#cite_note-Stansberry-result-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> Salacia and Actaea will next occult each other in 2067.<sup id="cite_ref-Stansberry-result_7-4" class="reference"><a href="#cite_note-Stansberry-result-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> </p> <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=Actaea_(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 reflist-columns references-column-width" style="column-width: 30em;"> <ol class="references"> <li id="cite_note-Grundy-orbits-1"><span class="mw-cite-backlink">^ <a href="#cite_ref-Grundy-orbits_1-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-Grundy-orbits_1-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-Grundy-orbits_1-2"><sup><i><b>c</b></i></sup></a> <a href="#cite_ref-Grundy-orbits_1-3"><sup><i><b>d</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="CITEREFGrundyNollRoeBuie2019" class="citation journal cs1">Grundy, W. M.; Noll, K. S.; Roe, H. G.; Buie, M. W.; Porter, S. B.; Parker, A. H.; Nesvorný, D.; Benecchi, S. D.; Stephens, D. C.; Trujillo, C. A. 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