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<div class="vector-body-before-content"> <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"></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">Non-periodic comet</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">For other comets discovered by the Mount Lemmon Survey, see <a href="/wiki/Comet_Lemmon_(disambiguation)" title="Comet Lemmon (disambiguation)">Comet Lemmon</a>.</div> <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">C/2018 C2 (Lemmon)</caption><tbody><tr><td colspan="2" class="infobox-image"><span class="mw-default-size" typeof="mw:File/Frameless"><a href="/wiki/File:A2018_C2-orbit.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/1/10/A2018_C2-orbit.png/290px-A2018_C2-orbit.png" decoding="async" width="290" height="140" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/10/A2018_C2-orbit.png/435px-A2018_C2-orbit.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/10/A2018_C2-orbit.png/580px-A2018_C2-orbit.png 2x" data-file-width="4206" data-file-height="2030" /></a></span><div class="infobox-caption">Annual motion through the Solar System</div></td></tr><tr><th colspan="2" class="infobox-header" style="background-color:#FFE0C2">Discovery <sup id="cite_ref-MPC-object_1-0" class="reference"><a href="#cite_note-MPC-object-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-MPEC2018-E18_2-0" class="reference"><a href="#cite_note-MPEC2018-E18-2"><span class="cite-bracket">[</span>2<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"><a href="/wiki/Mount_Lemmon_Survey" title="Mount Lemmon Survey">Mount Lemmon Srvy.</a></td></tr><tr><th scope="row" class="infobox-label" style="max-width:11em;"><a href="/wiki/List_of_observatory_codes" title="List of observatory codes">Discovery site</a></th><td class="infobox-data"><a href="/wiki/Mount_Lemmon_Observatory" title="Mount Lemmon Observatory">Mount Lemmon Obs.</a></td></tr><tr><th scope="row" class="infobox-label" style="max-width:11em;">Discovery date</th><td class="infobox-data">5 February 2018<br /><span style="font-size:85%;">(first observed only)</span></td></tr><tr><th colspan="2" class="infobox-header" style="background-color:#FFE0C2">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">C/2018 C2 (Lemmon)</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">ZC82561, A/2018 C2</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/Hyperbolic_comet" class="mw-redirect" title="Hyperbolic comet">hyperbolic comet</a> <sup id="cite_ref-jpldata_3-0" class="reference"><a href="#cite_note-jpldata-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup></td></tr><tr><th colspan="2" class="infobox-header" style="background-color:#FFE0C2"><a href="/wiki/Osculating_orbit" title="Osculating orbit">Orbital characteristics</a> <sup id="cite_ref-jpldata_3-1" class="reference"><a href="#cite_note-jpldata-3"><span class="cite-bracket">[</span>3<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> 20 May 2018 (<a href="/wiki/Julian_day" title="Julian day">JD</a> 2458258.5)</td></tr><tr><th scope="row" class="infobox-label" style="max-width:11em;"><a href="/wiki/Observation_arc" title="Observation arc">Observation arc</a></th><td class="infobox-data">272 days</td></tr><tr><th scope="row" class="infobox-label" style="max-width:11em;"><a href="/wiki/Perihelion_and_aphelion" class="mw-redirect" title="Perihelion and aphelion">Perihelion</a></th><td class="infobox-data"><span class="nowrap"><span data-sort-value="7000195650000000000♠"></span>1.9565</span> <a href="/wiki/Astronomical_unit" title="Astronomical unit">AU</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/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="2996891700000000000♠"></span>−1083<span style="margin-left:0.3em;margin-right:0.15em;">±</span>3</span> AU<sup id="cite_ref-orbital-remark_4-0" class="reference"><a href="#cite_note-orbital-remark-4"><span class="cite-bracket">[</span>a<span class="cite-bracket">]</span></a></sup></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="7000100180000000000♠"></span>1.0018</span><br />0.99924 (Barycentric epoch 2200)<sup id="cite_ref-barycenter_5-0" class="reference"><a href="#cite_note-barycenter-5"><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;"><a href="/wiki/Orbital_period" title="Orbital period">Orbital period (sidereal)</a></div></th><td class="infobox-data">≈ 130,000 years (outbound)<sup id="cite_ref-barycenter_5-1" class="reference"><a href="#cite_note-barycenter-5"><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;"><a href="/wiki/Mean_anomaly#Mean_anomaly_at_epoch" title="Mean anomaly">Mean anomaly</a></div></th><td class="infobox-data">-0.00036</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_motion" title="Mean motion">Mean motion</a></div></th><td class="infobox-data">0° 0<sup>m</sup> 0.072<sup>s</sup> / day</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">34.453°</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">91.14°</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">134.14°</td></tr><tr><th scope="row" class="infobox-label" style="max-width:11em;">Earth <a href="/wiki/Minimum_orbit_intersection_distance" title="Minimum orbit intersection distance">MOID</a></th><td class="infobox-data">1.062 AU</td></tr><tr><th scope="row" class="infobox-label" style="max-width:11em;">Jupiter <a href="/wiki/Minimum_orbit_intersection_distance" title="Minimum orbit intersection distance">MOID</a></th><td class="infobox-data">1.405 AU</td></tr><tr><th colspan="2" class="infobox-header" style="background-color:#FFE0C2"><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="7003170000000000000♠"></span>1.7–7.6 <a href="/wiki/Kilometre" title="Kilometre">km</a></span> <span style="font-size:85%;">(assumed)</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/Apparent_magnitude" title="Apparent magnitude">Apparent magnitude</a></div></th><td class="infobox-data">19.0 <span style="font-size:85%;">(March 2018)</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/Absolute_magnitude#Solar_System_bodies_(H)" title="Absolute magnitude">Absolute magnitude <i>(H)</i></a></div></th><td class="infobox-data"><span class="nowrap"><span data-sort-value="7001151000000000000♠"></span>15.1<span style="margin-left:0.3em;margin-right:0.15em;">±</span>0.63</span></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>C/2018 C2 (Lemmon)</b> is a <a href="/wiki/Hyperbolic_comet" class="mw-redirect" title="Hyperbolic comet">hyperbolic comet</a> (previously classified as <b>A/2018 C2</b>, a <a href="/wiki/Hyperbolic_asteroid" title="Hyperbolic asteroid">hyperbolic asteroid</a>). It was first observed on 5 February 2018 by the <a href="/wiki/Mount_Lemmon_Survey" title="Mount Lemmon Survey">Mount Lemmon Survey</a> conducted at the <a href="/wiki/Mount_Lemmon_Observatory" title="Mount Lemmon Observatory">Mount Lemmon Observatory</a> near Tucson, Arizona, in the United States.<sup id="cite_ref-MPC-object_1-1" class="reference"><a href="#cite_note-MPC-object-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> The discovery was announced on 4 March 2018 along with another hyperbolic object, <a href="/wiki/A/2017_U7" class="mw-redirect" title="A/2017 U7">A/2017 U7</a>.<sup id="cite_ref-MPEC2018-E18_2-1" class="reference"><a href="#cite_note-MPEC2018-E18-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> Based on the <a href="/wiki/Absolute_magnitude#Solar_System_bodies_(H)" title="Absolute magnitude">absolute magnitude</a> of 15.1, it may measure several kilometers in diameter.<sup id="cite_ref-h_6-0" class="reference"><a href="#cite_note-h-6"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> On 22 March 2018 it was determined to be a hyperbolic comet.<sup id="cite_ref-MPEC2018-F136_7-0" class="reference"><a href="#cite_note-MPEC2018-F136-7"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> </p> <meta property="mw:PageProp/toc" /> <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=C/2018_C2_(Lemmon)&action=edit&section=1" 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:A2018-C2_eccentricity.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/7/7e/A2018-C2_eccentricity.png/220px-A2018-C2_eccentricity.png" decoding="async" width="220" height="112" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/7e/A2018-C2_eccentricity.png/330px-A2018-C2_eccentricity.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/7e/A2018-C2_eccentricity.png/440px-A2018-C2_eccentricity.png 2x" data-file-width="1258" data-file-height="640" /></a><figcaption>Heliocentric eccentricity from 2000–2035 which is strongly influenced by <a href="/wiki/Jupiter" title="Jupiter">Jupiter</a>'s 12 year orbital period.</figcaption></figure> <figure class="mw-default-size mw-halign-left" typeof="mw:File/Thumb"><a href="/wiki/File:A2018_C2-skypath.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/9/9c/A2018_C2-skypath.png/220px-A2018_C2-skypath.png" decoding="async" width="220" height="236" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/9c/A2018_C2-skypath.png/330px-A2018_C2-skypath.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/9c/A2018_C2-skypath.png/440px-A2018_C2-skypath.png 2x" data-file-width="2445" data-file-height="2619" /></a><figcaption>The path of C/2018 C2 across the sky with annual retrograde loops</figcaption></figure> <p>While near <a href="/wiki/Perihelion" class="mw-redirect" title="Perihelion">perihelion</a>, A/2018 C2's heliocentric orbit is not bound to the <a href="/wiki/Solar_System" title="Solar System">Solar System</a>, unlike <a href="/wiki/%CA%BBOumuamua" title="ʻOumuamua">ʻOumuamua</a>, it is not an <a href="/wiki/Interstellar_object" title="Interstellar object">interstellar object</a>. The heliocentric eccentricity drops below 1 starting with an <a href="/wiki/Epoch_(astronomy)" title="Epoch (astronomy)">epoch</a> of January 2023,<sup id="cite_ref-closed_8-0" class="reference"><a href="#cite_note-closed-8"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> when it is 13.8 AU from the Sun, making the orbit bound to the Sun before it leaves the planetary region of the Solar System. The more stable barycentric orbit of A/2018 C2, shows that it is only a very distant <a href="/wiki/Small_Solar_System_body" title="Small Solar System body">small Solar System body</a>, approaching as far as 50,000 <a href="/wiki/Astronomical_unit" title="Astronomical unit">AU</a> from the Sun, around the distance of the <a href="/wiki/Oort_Cloud" class="mw-redirect" title="Oort Cloud">Oort Cloud</a>. It had an orbital period of millions of years until the current approach to the <a href="/wiki/Solar_System" title="Solar System">Solar System</a>, where perturbations will shorten the orbit drastically to about 5,200 AU, with an orbital period of 130,000 years.<sup id="cite_ref-barycenter_5-2" class="reference"><a href="#cite_note-barycenter-5"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> Hui Man-To calculated that the comet would have its next perihelion after 130 to 140 thousands years, at a distance of about 2 AU.<sup id="cite_ref-Man-To_9-0" class="reference"><a href="#cite_note-Man-To-9"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-barycenter_5-3" class="reference"><a href="#cite_note-barycenter-5"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> </p><p>As of March 2018<sup class="plainlinks noexcerpt noprint asof-tag update" style="display:none;"><a class="external text" href="https://en.wikipedia.org/w/index.php?title=C/2018_C2_(Lemmon)&action=edit">[update]</a></sup>, A/2018 C2 was inbound 2.2 <a href="/wiki/Astronomical_unit" title="Astronomical unit">AU</a> (330,000,000 <a href="/wiki/Kilometre" title="Kilometre">km</a>; 200,000,000 <a href="/wiki/Mile" title="Mile">mi</a>) from the Sun.<sup id="cite_ref-MPEC2018-E18_2-2" class="reference"><a href="#cite_note-MPEC2018-E18-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> A/2018 C2 made closest approach to the Sun on 2 June 2018 at a distance of 1.9 AU (outside the orbit of <a href="/wiki/Mars" title="Mars">Mars</a>).<sup id="cite_ref-jpldata_3-2" class="reference"><a href="#cite_note-jpldata-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> Since this object out gassed generating a cometary <a href="/wiki/Coma_(cometary)" class="mw-redirect" title="Coma (cometary)">coma</a><sup id="cite_ref-Man-To_9-1" class="reference"><a href="#cite_note-Man-To-9"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> while near the <a href="/wiki/Inner_Solar_System" class="mw-redirect" title="Inner Solar System">inner Solar System</a>, it was reclassified as a <a href="/wiki/Hyperbolic_comet" class="mw-redirect" title="Hyperbolic comet">hyperbolic comet</a>.<sup id="cite_ref-hyperbolic-comets_10-0" class="reference"><a href="#cite_note-hyperbolic-comets-10"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Notes">Notes</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=C/2018_C2_(Lemmon)&action=edit&section=2" title="Edit section: Notes"><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-lower-alpha"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-orbital-remark-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-orbital-remark_4-0">^</a></b></span> <span class="reference-text">Objects on hyperbolic trajectories have negative semimajor axis, giving them a positive orbital energy.</span> </li> </ol></div></div> <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=C/2018_C2_(Lemmon)&action=edit&section=3" 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-MPC-object-1"><span class="mw-cite-backlink">^ <a href="#cite_ref-MPC-object_1-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-MPC-object_1-1"><sup><i><b>b</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 class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.minorplanetcenter.net/db_search/show_object?object_id=C/2018+C2">"C/2018 C2"</a>. <i>Minor Planet Center</i><span class="reference-accessdate">. Retrieved <span class="nowrap">5 March</span> 2018</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=Minor+Planet+Center&rft.atitle=C%2F2018+C2&rft_id=https%3A%2F%2Fwww.minorplanetcenter.net%2Fdb_search%2Fshow_object%3Fobject_id%3DC%2F2018%2BC2&rfr_id=info%3Asid%2Fen.wikipedia.org%3AC%2F2018+C2+%28Lemmon%29" class="Z3988"></span></span> </li> <li id="cite_note-MPEC2018-E18-2"><span class="mw-cite-backlink">^ <a href="#cite_ref-MPEC2018-E18_2-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-MPEC2018-E18_2-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-MPEC2018-E18_2-2"><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 class="citation web cs1"><a rel="nofollow" class="external text" href="https://minorplanetcenter.net/mpec/K18/K18E18.html">"MPEC 2018-E18 : A/2018 C2"</a>. <a href="/wiki/IAU_Minor_Planet_Center" class="mw-redirect" title="IAU Minor Planet Center">IAU Minor Planet Center</a>. 4 March 2018<span class="reference-accessdate">. Retrieved <span class="nowrap">4 March</span> 2018</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=MPEC+2018-E18+%3A+A%2F2018+C2&rft.pub=IAU+Minor+Planet+Center&rft.date=2018-03-04&rft_id=https%3A%2F%2Fminorplanetcenter.net%2Fmpec%2FK18%2FK18E18.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3AC%2F2018+C2+%28Lemmon%29" class="Z3988"></span> (AK18C020)</span> </li> <li id="cite_note-jpldata-3"><span class="mw-cite-backlink">^ <a href="#cite_ref-jpldata_3-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-jpldata_3-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-jpldata_3-2"><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 class="citation web cs1"><a rel="nofollow" class="external text" href="https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2018C2">"JPL Small-Body Database Browser: (A/2018 C2)"</a> (2018-02-27 last obs.). <a href="/wiki/Jet_Propulsion_Laboratory" title="Jet Propulsion Laboratory">Jet Propulsion Laboratory</a>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20180305200627/https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2018C2">Archived</a> from the original on 5 March 2018<span class="reference-accessdate">. Retrieved <span class="nowrap">5 March</span> 2018</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=JPL+Small-Body+Database+Browser%3A+%28A%2F2018+C2%29&rft.pub=Jet+Propulsion+Laboratory&rft_id=https%3A%2F%2Fssd.jpl.nasa.gov%2Fsbdb.cgi%3Fsstr%3D2018C2&rfr_id=info%3Asid%2Fen.wikipedia.org%3AC%2F2018+C2+%28Lemmon%29" class="Z3988"></span></span> </li> <li id="cite_note-barycenter-5"><span class="mw-cite-backlink">^ <a href="#cite_ref-barycenter_5-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-barycenter_5-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-barycenter_5-2"><sup><i><b>c</b></i></sup></a> <a href="#cite_ref-barycenter_5-3"><sup><i><b>d</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFHorizons_output" class="citation web cs1"><a href="/wiki/JPL_Horizons_On-Line_Ephemeris_System" title="JPL Horizons On-Line Ephemeris System">Horizons</a> output. <a rel="nofollow" class="external text" href="https://ssd.jpl.nasa.gov/horizons_batch.cgi?batch=1&COMMAND=%272018+C2%27&MAKE_EPHEM=%27YES%27&TABLE_TYPE=%27ELEMENTS%27&START_TIME=%272200-01-01%27&STOP_TIME=%272300-01-01%27&STEP_SIZE=%27200%20years%27&CENTER=%27@0%27&OUT_UNITS=%27AU-D%27">"Barycentric Osculating Orbital Elements for Comet C/2018 C2 (Lemmon)"</a><span class="reference-accessdate">. Retrieved <span class="nowrap">15 October</span> 2022</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Barycentric+Osculating+Orbital+Elements+for+Comet+C%2F2018+C2+%28Lemmon%29&rft.au=Horizons+output&rft_id=https%3A%2F%2Fssd.jpl.nasa.gov%2Fhorizons_batch.cgi%3Fbatch%3D1%26COMMAND%3D%25272018%2BC2%2527%26MAKE_EPHEM%3D%2527YES%2527%26TABLE_TYPE%3D%2527ELEMENTS%2527%26START_TIME%3D%25272200-01-01%2527%26STOP_TIME%3D%25272300-01-01%2527%26STEP_SIZE%3D%2527200%2520years%2527%26CENTER%3D%2527%400%2527%26OUT_UNITS%3D%2527AU-D%2527&rfr_id=info%3Asid%2Fen.wikipedia.org%3AC%2F2018+C2+%28Lemmon%29" class="Z3988"></span></span> </li> <li id="cite_note-h-6"><span class="mw-cite-backlink"><b><a href="#cite_ref-h_6-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://cneos.jpl.nasa.gov/tools/ast_size_est.html">"Asteroid Size Estimator"</a>. <a href="/wiki/Jet_Propulsion_Laboratory" title="Jet Propulsion Laboratory">Jet Propulsion Laboratory</a><span class="reference-accessdate">. Retrieved <span class="nowrap">5 March</span> 2018</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Asteroid+Size+Estimator&rft.pub=Jet+Propulsion+Laboratory&rft_id=https%3A%2F%2Fcneos.jpl.nasa.gov%2Ftools%2Fast_size_est.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3AC%2F2018+C2+%28Lemmon%29" class="Z3988"></span></span> </li> <li id="cite_note-MPEC2018-F136-7"><span class="mw-cite-backlink"><b><a href="#cite_ref-MPEC2018-F136_7-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://minorplanetcenter.net/mpec/K18/K18FD6.html">"MPEC 2018-F136: COMET C/2018 C2 (Lemmon)"</a>. <a href="/wiki/IAU_Minor_Planet_Center" class="mw-redirect" title="IAU Minor Planet Center">IAU Minor Planet Center</a>. 28 March 2018<span class="reference-accessdate">. Retrieved <span class="nowrap">28 March</span> 2018</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=MPEC+2018-F136%3A+COMET+C%2F2018+C2+%28Lemmon%29&rft.pub=IAU+Minor+Planet+Center&rft.date=2018-03-28&rft_id=https%3A%2F%2Fminorplanetcenter.net%2Fmpec%2FK18%2FK18FD6.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3AC%2F2018+C2+%28Lemmon%29" class="Z3988"></span> (CK18C020)</span> </li> <li id="cite_note-closed-8"><span class="mw-cite-backlink"><b><a href="#cite_ref-closed_8-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFHorizons_output" class="citation web cs1"><a href="/wiki/JPL_Horizons_On-Line_Ephemeris_System" title="JPL Horizons On-Line Ephemeris System">Horizons</a> output. <a rel="nofollow" class="external text" href="https://ssd.jpl.nasa.gov/horizons_batch.cgi?batch=1&COMMAND=%272018+C2%27&MAKE_EPHEM=%27YES%27&TABLE_TYPE=%27ELEMENTS%27&START_TIME=%272022-10-01%27&STOP_TIME=%272023-04-01%27&STEP_SIZE=%271%20month%27&CENTER=%27@Sun%27&OUT_UNITS=%27AU-D%27">"Heliocentric orbit of Comet C/2018 C2 (Lemmon) becoming CLOSED in January 2023"</a><span class="reference-accessdate">. Retrieved <span class="nowrap">16 October</span> 2022</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Heliocentric+orbit+of+Comet+C%2F2018+C2+%28Lemmon%29+becoming+CLOSED+in+January+2023&rft.au=Horizons+output&rft_id=https%3A%2F%2Fssd.jpl.nasa.gov%2Fhorizons_batch.cgi%3Fbatch%3D1%26COMMAND%3D%25272018%2BC2%2527%26MAKE_EPHEM%3D%2527YES%2527%26TABLE_TYPE%3D%2527ELEMENTS%2527%26START_TIME%3D%25272022-10-01%2527%26STOP_TIME%3D%25272023-04-01%2527%26STEP_SIZE%3D%25271%2520month%2527%26CENTER%3D%2527%40Sun%2527%26OUT_UNITS%3D%2527AU-D%2527&rfr_id=info%3Asid%2Fen.wikipedia.org%3AC%2F2018+C2+%28Lemmon%29" class="Z3988"></span></span> </li> <li id="cite_note-Man-To-9"><span class="mw-cite-backlink">^ <a href="#cite_ref-Man-To_9-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-Man-To_9-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFHui2018" class="citation journal cs1">Hui, Man-To (27 July 2018). <a rel="nofollow" class="external text" href="https://doi.org/10.3847%2F1538-3881%2Faacdf3">"Two Hyperbolic Baldheads in the Solar System: 2017 U7 and 2018 C2"</a>. <i>The Astronomical Journal</i>. <b>156</b> (2): 73. <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/1806.06904">1806.06904</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/2018AJ....156...73H">2018AJ....156...73H</a>. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://doi.org/10.3847%2F1538-3881%2Faacdf3">10.3847/1538-3881/aacdf3</a></span>. <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:250760308">250760308</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=Two+Hyperbolic+Baldheads+in+the+Solar+System%3A+2017+U7+and+2018+C2&rft.volume=156&rft.issue=2&rft.pages=73&rft.date=2018-07-27&rft_id=info%3Aarxiv%2F1806.06904&rft_id=https%3A%2F%2Fapi.semanticscholar.org%2FCorpusID%3A250760308%23id-name%3DS2CID&rft_id=info%3Adoi%2F10.3847%2F1538-3881%2Faacdf3&rft_id=info%3Abibcode%2F2018AJ....156...73H&rft.aulast=Hui&rft.aufirst=Man-To&rft_id=https%3A%2F%2Fdoi.org%2F10.3847%252F1538-3881%252Faacdf3&rfr_id=info%3Asid%2Fen.wikipedia.org%3AC%2F2018+C2+%28Lemmon%29" class="Z3988"></span></span> </li> <li id="cite_note-hyperbolic-comets-10"><span class="mw-cite-backlink"><b><a href="#cite_ref-hyperbolic-comets_10-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://ssd.jpl.nasa.gov/sbdb_query.cgi?obj_group=all;obj_kind=com;obj_numbered=all;OBJ_field=0;ORB_field=0;c1_group=ORB;c1_item=Bg;c1_op=%3E;c1_value=1;table_format=HTML;max_rows=100;format_option=comp;c_fields=AcBhBgBjBiBnBsCk;.cgifields=format_option;.cgifields=obj_kind;.cgifields=obj_group;.cgifields=obj_numbered;.cgifields=ast_orbit_class;.cgifields=table_format;.cgifields=com_orbit_class&query=1&c_sort=AcA">"JPL Small-Body Database Search Engine: comets and e > 1"</a>. Jet Propulsion Laboratory Solar System Dynamics<span class="reference-accessdate">. Retrieved <span class="nowrap">4 March</span> 2018</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=JPL+Small-Body+Database+Search+Engine%3A+comets+and+e+%3E+1&rft.pub=Jet+Propulsion+Laboratory+Solar+System+Dynamics&rft_id=http%3A%2F%2Fssd.jpl.nasa.gov%2Fsbdb_query.cgi%3Fobj_group%3Dall%3Bobj_kind%3Dcom%3Bobj_numbered%3Dall%3BOBJ_field%3D0%3BORB_field%3D0%3Bc1_group%3DORB%3Bc1_item%3DBg%3Bc1_op%3D%253E%3Bc1_value%3D1%3Btable_format%3DHTML%3Bmax_rows%3D100%3Bformat_option%3Dcomp%3Bc_fields%3DAcBhBgBjBiBnBsCk%3B.cgifields%3Dformat_option%3B.cgifields%3Dobj_kind%3B.cgifields%3Dobj_group%3B.cgifields%3Dobj_numbered%3B.cgifields%3Dast_orbit_class%3B.cgifields%3Dtable_format%3B.cgifields%3Dcom_orbit_class%26query%3D1%26c_sort%3DAcA&rfr_id=info%3Asid%2Fen.wikipedia.org%3AC%2F2018+C2+%28Lemmon%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=C/2018_C2_(Lemmon)&action=edit&section=4" 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://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=2018C2">C/2018 C2</a> at the <i><a href="/wiki/JPL_Small-Body_Database" title="JPL Small-Body Database">JPL Small-Body Database</a></i><ul class="noprint"><li><a rel="nofollow" class="external text" href="https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=2018C2&view=C">Close approach</a> <b>·</b> <a rel="nofollow" class="external text" href="https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=2018C2&view=D">Discovery</a> <b>·</b> <a rel="nofollow" class="external text" href="https://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=2018C2">Ephemeris</a> <b>·</b> <a rel="nofollow" class="external text" href="https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=2018C2&view=V">Orbit viewer</a> <b>·</b> <a rel="nofollow" class="external text" href="https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=2018C2&view=O">Orbit parameters</a> <b>·</b> <a rel="nofollow" class="external text" href="https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=2018C2&view=P">Physical parameters</a></li></ul></li></ul> <p class="mw-empty-elt"> </p> <div class="navbox-styles"><style data-mw-deduplicate="TemplateStyles:r1129693374">.mw-parser-output .hlist dl,.mw-parser-output .hlist ol,.mw-parser-output .hlist ul{margin:0;padding:0}.mw-parser-output .hlist dd,.mw-parser-output .hlist dt,.mw-parser-output .hlist li{margin:0;display:inline}.mw-parser-output .hlist.inline,.mw-parser-output .hlist.inline dl,.mw-parser-output .hlist.inline ol,.mw-parser-output .hlist.inline ul,.mw-parser-output .hlist dl dl,.mw-parser-output .hlist dl ol,.mw-parser-output .hlist dl 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a>span,.mw-parser-output .navbar a>abbr{text-decoration:inherit}.mw-parser-output .navbar-mini abbr{font-variant:small-caps;border-bottom:none;text-decoration:none;cursor:inherit}.mw-parser-output .navbar-ct-full{font-size:114%;margin:0 7em}.mw-parser-output .navbar-ct-mini{font-size:114%;margin:0 4em}html.skin-theme-clientpref-night .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}@media(prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}}@media print{.mw-parser-output .navbar{display:none!important}}</style><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:2018_in_space" title="Template:2018 in space"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:2018_in_space" title="Template talk:2018 in space"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:2018_in_space" title="Special:EditPage/Template:2018 in space"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="2018_in_space" style="font-size:114%;margin:0 4em">2018 in space</div></th></tr><tr><td class="navbox-abovebelow" colspan="3"><div> <ul><li><div style="float:left"> « <a href="/wiki/Template:2017_in_space" title="Template:2017 in space">2017</a></div> <div style="float:right"><a href="/wiki/Template:2019_in_space" title="Template:2019 in space">2019</a> »</div></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/2018_in_spaceflight" title="2018 in spaceflight">Space probe<br />launches</a> <span typeof="mw:File"><a href="/wiki/Category:Space_probes_launched_in_2018" title="Category:Space probes launched in 2018"><img alt="Space probes launched in 2018" src="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/15px-Symbol_category_class.svg.png" decoding="async" width="15" height="15" 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/30px-Symbol_category_class.svg.png 2x" data-file-width="180" data-file-height="185" /></a></span></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/Transiting_Exoplanet_Survey_Satellite" title="Transiting Exoplanet Survey Satellite">TESS</a> (lunar flyby; Apr 2018)</li> <li><i><a href="/wiki/Queqiao_relay_satellite" class="mw-redirect" title="Queqiao relay satellite">Queqiao</a></i> (mission to the <a href="/wiki/Moon" title="Moon">Moon</a>; May 2018)</li> <li><i><a href="/wiki/InSight" title="InSight">InSight</a></i> / <a href="/wiki/Mars_Cube_One" title="Mars Cube One">Mars Cube One</a> (mission to <a href="/wiki/Mars" title="Mars">Mars</a>; May 2018)</li> <li><i><a href="/wiki/Parker_Solar_Probe" title="Parker Solar Probe">Parker Solar Probe</a></i> (solar space mission; Aug 2018)</li> <li><i><a href="/wiki/BepiColombo" title="BepiColombo">BepiColombo</a></i> (mission to <a href="/wiki/Mercury_(planet)" title="Mercury (planet)">Mercury</a>; Oct 2018)</li> <li><a href="/wiki/Chang%27e_4" title="Chang'e 4">Chang'e 4</a> / <a href="/wiki/Yutu-2" title="Yutu-2">Yutu-2</a> (mission to the <a href="/wiki/Moon" title="Moon">Moon</a>; Dec 2018)</li></ul> </div></td><td class="noviewer navbox-image" rowspan="8" style="width:1px;padding:0 0 0 2px;padding-left: 0.5em;"><div><span typeof="mw:File"><a href="/wiki/File:NASA-Icarus-MostDistantMainSequenceStar-20180402.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/7/7e/NASA-Icarus-MostDistantMainSequenceStar-20180402.jpg/150px-NASA-Icarus-MostDistantMainSequenceStar-20180402.jpg" decoding="async" width="150" height="100" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/7e/NASA-Icarus-MostDistantMainSequenceStar-20180402.jpg/225px-NASA-Icarus-MostDistantMainSequenceStar-20180402.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/7e/NASA-Icarus-MostDistantMainSequenceStar-20180402.jpg/300px-NASA-Icarus-MostDistantMainSequenceStar-20180402.jpg 2x" data-file-width="1000" data-file-height="667" /></a></span><br /><span typeof="mw:File"><a href="/wiki/File:PIA22876-InSight-FirstSelfie-20181211.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/7/7c/PIA22876-InSight-FirstSelfie-20181211.jpg/150px-PIA22876-InSight-FirstSelfie-20181211.jpg" decoding="async" width="150" height="86" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/7c/PIA22876-InSight-FirstSelfie-20181211.jpg/225px-PIA22876-InSight-FirstSelfie-20181211.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/7c/PIA22876-InSight-FirstSelfie-20181211.jpg/300px-PIA22876-InSight-FirstSelfie-20181211.jpg 2x" data-file-width="4391" data-file-height="2504" /></a></span><br /><span typeof="mw:File"><a href="/wiki/File:Bennu_at_300_pixels_(wide).png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/9/95/Bennu_at_300_pixels_%28wide%29.png/150px-Bennu_at_300_pixels_%28wide%29.png" decoding="async" width="150" height="105" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/95/Bennu_at_300_pixels_%28wide%29.png/225px-Bennu_at_300_pixels_%28wide%29.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/95/Bennu_at_300_pixels_%28wide%29.png/300px-Bennu_at_300_pixels_%28wide%29.png 2x" data-file-width="500" data-file-height="350" /></a></span></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Impact_event" title="Impact event">Impact events</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/2018_LA" title="2018 LA">2018 LA</a></li> <li><a href="/wiki/Kamchatka_meteor" title="Kamchatka meteor">Kamchatka meteor</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Selected <a href="/wiki/Near-Earth_object" title="Near-Earth object">NEOs</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_asteroid_close_approaches_to_Earth_in_2018" title="List of asteroid close approaches to Earth in 2018">Asteroid close approaches</a></li> <li><span class="nowrap"><a href="/wiki/2010_WC9" title="2010 WC9">2010 WC<span style="position: relative; top: 0.3em;"><span style="font-size:80%;">9</span></span></a></span></li> <li><span class="nowrap"><a href="/wiki/2017_VR12" title="2017 VR12">2017 VR<span style="position: relative; top: 0.3em;"><span style="font-size:80%;">12</span></span></a></span></li> <li><span class="nowrap"><a href="/wiki/2017_YE5" title="2017 YE5">2017 YE<span style="position: relative; top: 0.3em;"><span style="font-size:80%;">5</span></span></a></span></li> <li><span class="nowrap"><a href="/wiki/2017_YZ1" class="mw-redirect" title="2017 YZ1">2017 YZ<span style="position: relative; top: 0.3em;"><span style="font-size:80%;">1</span></span></a></span></li> <li><a href="/wiki/2018_AH" title="2018 AH">2018 AH</a></li> <li><a href="/wiki/2018_BD" title="2018 BD">2018 BD</a></li> <li><span class="nowrap"><a href="/wiki/2018_BF3" title="2018 BF3">2018 BF<span style="position: relative; top: 0.3em;"><span style="font-size:80%;">3</span></span></a></span></li> <li><a href="/wiki/2018_CB" title="2018 CB">2018 CB</a></li> <li><a href="/wiki/2018_CC" title="2018 CC">2018 CC</a></li> <li><span class="nowrap"><a href="/wiki/(276033)_2002_AJ129" title="(276033) 2002 AJ129">(276033) 2002 AJ<span style="position: relative; top: 0.3em;"><span style="font-size:80%;">129</span></span></a></span></li> <li><span class="nowrap"><a href="/wiki/(505657)_2014_SR339" title="(505657) 2014 SR339">(505657) 2014 SR<span style="position: relative; top: 0.3em;"><span style="font-size:80%;">339</span></span></a></span></li> <li><span class="nowrap"><a href="/wiki/2018_CF2" title="2018 CF2">2018 CF<span style="position: relative; top: 0.3em;"><span style="font-size:80%;">2</span></span></a></span></li> <li><a href="/wiki/2018_CL" title="2018 CL">2018 CL</a></li> <li><span class="nowrap"><a href="/wiki/2018_CN2" title="2018 CN2">2018 CN<span style="position: relative; top: 0.3em;"><span style="font-size:80%;">2</span></span></a></span></li> <li><span class="nowrap"><a href="/wiki/2018_CY2" title="2018 CY2">2018 CY<span style="position: relative; top: 0.3em;"><span style="font-size:80%;">2</span></span></a></span></li> <li><span class="nowrap"><a href="/wiki/2018_DV1" title="2018 DV1">2018 DV<span style="position: relative; top: 0.3em;"><span style="font-size:80%;">1</span></span></a></span></li> <li><span class="nowrap"><a href="/wiki/2018_GE3" title="2018 GE3">2018 GE<span style="position: relative; top: 0.3em;"><span style="font-size:80%;">3</span></span></a></span></li> <li><span class="nowrap"><a href="/wiki/2018_PD20" title="2018 PD20">2018 PD<span style="position: relative; top: 0.3em;"><span style="font-size:80%;">20</span></span></a></span></li> <li><span class="nowrap"><a href="/wiki/2018_LF16" title="2018 LF16">2018 LF<span style="position: relative; top: 0.3em;"><span style="font-size:80%;">16</span></span></a></span></li> <li><span class="nowrap"><a href="/wiki/2018_WV1" title="2018 WV1">2018 WV<span style="position: relative; top: 0.3em;"><span style="font-size:80%;">1</span></span></a></span></li> <li><span class="nowrap"><a href="/wiki/(163899)_2003_SD220" title="(163899) 2003 SD220">(163899) 2003 SD<span style="position: relative; top: 0.3em;"><span style="font-size:80%;">220</span></span></a></span></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/List_of_exoplanets_discovered_in_2018" title="List of exoplanets discovered in 2018">Exoplanets</a> <span typeof="mw:File"><a href="/wiki/Category:Exoplanets_discovered_in_2018" title="Category:Exoplanets discovered in 2018"><img alt="Exoplanets discovered in 2018" src="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/15px-Symbol_category_class.svg.png" decoding="async" width="15" height="15" 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/30px-Symbol_category_class.svg.png 2x" data-file-width="180" data-file-height="185" /></a></span></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/Gliese_1132" class="mw-redirect" title="Gliese 1132">Gliese 1132 c</a></li> <li>possible <a href="/wiki/Exomoon" title="Exomoon">exomoon</a> <a href="/wiki/Kepler-1625b_I" title="Kepler-1625b I">Kepler-1625b I</a></li> <li><a href="/wiki/K2-141b" title="K2-141b">K2-141b</a></li> <li><a href="/wiki/K2-146b" title="K2-146b">K2-146b</a></li> <li><a href="/wiki/K2-148b" title="K2-148b">K2-148b</a></li> <li><a href="/wiki/K2-155d" title="K2-155d">K2-155d</a></li> <li><a href="/wiki/K2-229b" title="K2-229b">K2-229b</a></li> <li><a href="/wiki/K2-239" title="K2-239">K2-239b</a></li> <li><a href="/wiki/K2-239" title="K2-239">K2-239c</a></li> <li><a href="/wiki/K2-239" title="K2-239">K2-239d</a></li> <li><a href="/wiki/K2-288Bb" title="K2-288Bb">K2-288Bb</a></li> <li><a href="/wiki/Barnard%27s_Star_b" class="mw-redirect" title="Barnard's Star b">Barnard's Star b</a> <span style="font-size:85%;">(refuted in 2021)</span></li> <li><a href="/wiki/EPIC_211945201_b" class="mw-redirect" title="EPIC 211945201 b">EPIC 211945201 b</a></li> <li><a href="/wiki/HD_89345_b" title="HD 89345 b">HD 89345 b</a></li> <li><a href="/wiki/KELT-21b" title="KELT-21b">KELT-21b</a></li> <li><a href="/wiki/NGTS-3Ab" title="NGTS-3Ab">NGTS-3Ab</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Discoveries</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/LSPM_J0207%2B3331" title="LSPM J0207+3331">LSPM J0207+3331</a></li> <li><a href="/wiki/VVV-WIT-07" title="VVV-WIT-07">VVV-WIT-07</a></li> <li><a href="/wiki/MACS_J1149_Lensed_Star_1" title="MACS J1149 Lensed Star 1">MACS J1149 Lensed Star 1</a></li> <li>10 <a href="/wiki/Moons_of_Jupiter" title="Moons of Jupiter">moons of Jupiter</a></li> <li><a href="/wiki/541132_Lele%C4%81k%C5%ABhonua" title="541132 Leleākūhonua">541132 Leleākūhonua</a> <span style="font-size:85%;">(announced)</span></li> <li><a href="/wiki/Hyperion_proto-supercluster" title="Hyperion proto-supercluster">Hyperion proto-supercluster</a></li> <li><a href="/wiki/2MASS_J18082002%E2%88%925104378" title="2MASS J18082002−5104378">2MASS J18082002−5104378</a></li> <li>Farout (<span class="nowrap"><a href="/wiki/2018_VG18" title="2018 VG18">2018 VG<span style="position: relative; top: 0.3em;"><span style="font-size:80%;">18</span></span></a></span>)</li> <li>FarFarOut (<span class="nowrap"><a href="/wiki/2018_AG37" title="2018 AG37">2018 AG<span style="position: relative; top: 0.3em;"><span style="font-size:80%;">37</span></span></a></span> <span style="font-size:85%;">first imaged</span>)</li> <li><a href="/wiki/AT2018hyz" title="AT2018hyz">AT2018hyz</a></li> <li><a href="/wiki/SN_2018cow" title="SN 2018cow">SN 2018cow</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Nova" title="Nova">Novae</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/V357_Muscae" title="V357 Muscae">V357 Muscae</a> (Nova Muscae)</li> <li><a href="/wiki/V906_Carinae" title="V906 Carinae">V906 Carinae</a> (Nova Carinae)</li> <li><a href="/wiki/V392_Persei" title="V392 Persei">V392 Persei</a> (Nova Persei)</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Comets <span typeof="mw:File"><a href="/wiki/Category:Comets_in_2018" title="Category:Comets in 2018"><img alt="Comets in 2018" src="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/15px-Symbol_category_class.svg.png" decoding="async" width="15" height="15" 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/30px-Symbol_category_class.svg.png 2x" data-file-width="180" data-file-height="185" /></a></span></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/2017_T1_(Heinze)" title="C/2017 T1 (Heinze)">C/2017 T1 (Heinze)</a></li> <li><a href="/wiki/C/2017_U7" class="mw-redirect" title="C/2017 U7">C/2017 U7</a></li> <li><a class="mw-selflink selflink">C/2018 C2 (Lemmon)</a></li> <li><a href="/wiki/37P/Forbes" title="37P/Forbes">37P/Forbes</a></li> <li><a href="/wiki/66P/du_Toit" title="66P/du Toit">66P/du Toit</a></li> <li><a href="/wiki/64P/Swift%E2%80%93Gehrels" title="64P/Swift–Gehrels">64P/Swift–Gehrels</a></li> <li><a href="/wiki/38P/Stephan%E2%80%93Oterma" title="38P/Stephan–Oterma">38P/Stephan–Oterma</a></li> <li><a href="/wiki/C/2018_F4_(PanSTARRS)" title="C/2018 F4 (PanSTARRS)">C/2018 F4 (PanSTARRS)</a></li> <li><a href="/wiki/C/2018_V1_(Machholz-Fujikawa-Iwamoto)" class="mw-redirect" title="C/2018 V1 (Machholz-Fujikawa-Iwamoto)">C/2018 V1 (Machholz-Fujikawa-Iwamoto)</a></li> <li><a href="/wiki/46P/Wirtanen" title="46P/Wirtanen">46P/Wirtanen</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Space exploration</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><i><a href="/wiki/Hayabusa2" title="Hayabusa2">Hayabusa2</a></i> (asteroid <a href="/wiki/162173_Ryugu" title="162173 Ryugu">Ryugu</a> arrival; Jun 2018)</li> <li><a href="/wiki/Kepler_space_telescope" title="Kepler space telescope"><i>Kepler</i> retirement</a> (Oct 2018)</li> <li><i><a href="/wiki/InSight" title="InSight">InSight</a></i> (Mars landing; Oct 2018)</li> <li><a href="/wiki/Dawn_(spacecraft)" title="Dawn (spacecraft)"><i>Dawn</i> retirement</a> (Nov 2018)</li> <li><a href="/wiki/OSIRIS-REx" title="OSIRIS-REx">OSIRIS-REx</a> (asteroid <a href="/wiki/101955_Bennu" title="101955 Bennu">Bennu</a> arrival; Dec 2018)</li> <li><i><a href="/wiki/Voyager_2" title="Voyager 2">Voyager 2</a></i> (enters interstellar space; Dec 2018)</li> <li><i><a href="/wiki/New_Horizons" title="New Horizons">New Horizons</a></i> (encounter with <a href="/wiki/486958_Arrokoth" title="486958 Arrokoth">486958 Arrokoth</a>; Dec 2018 / Jan 2019)</li></ul> </div></td></tr><tr><td class="navbox-abovebelow" colspan="3"><div> <ul><li><span class="nowrap"><span class="noviewer" typeof="mw:File"><span><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/5/5c/Earth-moon.jpg/32px-Earth-moon.jpg" decoding="async" width="32" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/5c/Earth-moon.jpg/48px-Earth-moon.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/5c/Earth-moon.jpg/64px-Earth-moon.jpg 2x" data-file-width="3000" data-file-height="2400" /></span></span> </span><a href="/wiki/Portal:Outer_space" title="Portal:Outer space">Outer space portal</a></li> <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:2017_in_outer_space" title="Category:2017 in outer space">2017 in outer space</a> — <b><a href="/wiki/Category:2018_in_outer_space" title="Category:2018 in outer space">2018 in outer space</a></b> — <a href="/wiki/Category:2019_in_outer_space" title="Category:2019 in outer space">2019 in outer space</a></li></ul> </div></td></tr></tbody></table></div>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Retrieved from "<a dir="ltr" href="https://en.wikipedia.org/w/index.php?title=C/2018_C2_(Lemmon)&oldid=1254695399">https://en.wikipedia.org/w/index.php?title=C/2018_C2_(Lemmon)&oldid=1254695399</a>"</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/Help:Category" title="Help:Category">Categories</a>: <ul><li><a href="/wiki/Category:Hyperbolic_comets" title="Category:Hyperbolic comets">Hyperbolic comets</a></li><li><a href="/wiki/Category:Non-periodic_comets" title="Category:Non-periodic comets">Non-periodic comets</a></li><li><a href="/wiki/Category:Discoveries_by_MLS" title="Category:Discoveries by MLS">Discoveries 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