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Center for NEO Studies
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See <a href="http://www.enable-javascript.com">these instructions</a> for enabling JavaScript in your web browser. </div> </noscript> <!-- Top Nav-Bar (begin) --> <nav class="top-bar" role="navigation" data-topbar> <!-- here is the left-side site-logo-go-to-our-home-page button/label --> <ul class="title-area"> <li class="name"> <h2><a href="/">Home</a></h2> </li> <li class="toggle-topbar menu-icon"><a href="/"><span>Menu</span></a></li> </ul> <!-- start of main navigation buttons --> <section class="top-bar-section"> <ul class="right"> <li class="divider"></li> <li class="has-dropdown"> <a href="/about/">About</a> <ul class="dropdown"> <li><a class="two-line-menu" href="/about/cneos.html"><span>Center for<br/>NEO Studies</span></a></li> <li><a href="/about/basics.html">NEO Basics</a></li> <li><a href="/about/search_program.html">Search Program</a></li> </ul> </li> <li class="divider"></li> <li class="has-dropdown"> <a href="/orbits/">Orbits</a> <ul class="dropdown"> <li><a href="/orbits/intro.html">Introduction</a></li> <li><a href="https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html">NEO Lookup</a></li> <li><a href="https://ssd.jpl.nasa.gov/tools/sbdb_query.html">NEO DB Query</a></li> <li><a href="https://ssd.jpl.nasa.gov/horizons/">Horizons</a></li> <li><a href="/orbits/elements.html">Orbit Elements</a></li> <li><a href="/nhats/">Accessible NEAs</a></li> </ul> </li> <li class="divider"></li> <li class="has-dropdown"> <a class="two-line-menu" href="/ca/intro.html"><span>Close<br />Approaches</span></a> <ul class="dropdown"> <li><a href="/ca/intro.html">Introduction</a></li> <li><a href="/ca/">NEOs</a></li> <li><a href="/fireballs/">Fireballs</a></li> <li><a href="/pi/">Pre-Impact Detections</a></li> </ul> </li> <li class="divider"></li> <li class="has-dropdown"> <a class="two-line-menu" href="/risk/intro.html"><span>Impact<br />Risk</span></a> <ul class="dropdown"> <li><a href="/risk/intro.html">Introduction</a></li> <li><a href="/sentry/">Sentry</a></li> <li><a href="/scout/">Scout</a></li> </ul> </li> <li class="divider"></li> <li class="has-dropdown"> <a class="two-line-menu" href="/pd/"><span>Planetary<br />Defense</span></a> <ul class="dropdown"> <li><a href="/pd/">Introduction</a></li> <li><a href="/nda/">NEO Deflection App</a></li> <li><a href="/pd/cs/">Impact Scenarios</a></li> <li><a class="two-line-menu" href="https://www.nasa.gov/planetarydefense/overview"><span>NASA Planetary Defense<br/>Coordination Office</span></a></li> </ul> </li> <li class="divider"></li> <li class="has-dropdown"> <a class="two-line-menu" href="/stats/totals.html"><span>Discovery<br />Statistics</span></a> <ul class="dropdown"> <li><a href="/stats/">Introduction</a></li> <li><a href="/stats/totals.html">Cumulative Totals</a></li> <li><a href="/stats/size.html">by Size</a></li> <li><a href="/stats/site_all.html">by Survey (all)</a></li> <li><a href="/stats/site_140.html">by Survey (140m)</a></li> <li><a href="/stats/site_km.html">by Survey (km)</a></li> <li><a href="/stats/wise.html">WISE/NEOWISE</a></li> </ul> </li> <li class="divider"></li> <li class="has-dropdown"> <a href="/tools/">Tools</a> <ul class="dropdown"> <li><a href="/tools/ast_size_est.html">Asteroid Size Estimator</a></li> <li><a href="https://ssd.jpl.nasa.gov/tools/sb_ident.html">Sky Search</a></li> <li><a href="https://ssd.jpl.nasa.gov/tools/sbwobs.html">What's Observable</a></li> <li><a href="https://ssd.jpl.nasa.gov/horizons/">Horizons</a></li> <li><a href="https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html">NEO Lookup</a></li> <li><a href="https://ssd.jpl.nasa.gov/tools/sbdb_query.html">NEO DB Query</a></li> </ul> </li> <li class="divider"></li> <li class="has-dropdown"> <a href="/extras.html">Extras</a> <ul class="dropdown"> <li><a href="/news/">News Archive</a></li> <li><a href="/missions/">NEO Missions</a></li> <li><a href="/doc/">Documents</a></li> <li><a href="/faq/">FAQ</a></li> <li><a href="/glossary/">Glossary</a></li> <li><a href="/links/">Related Links</a></li> <li><a href="/feed/">RSS Feeds</a></li> <li><a href="/sitemap.html">Site Map</a></li> </ul> </li> </ul> </section> </nav> <!-- Top Nav-Bar (end) --> <!-- <breadcrumbs> --> <!-- </breadcrumbs> --> </div> </div> </div> <!-- Page Title and Executive Summary (begin) --> <div class="row"> <div class="medium-11 medium-centered columns executive-summary"> <span>CNEOS is NASA's center for computing asteroid and comet orbits and their odds of Earth impact. </span> <hr/> </div> </div> <!-- Page Title and Executive Summary (end) --> <!-- page content: begin --> <a name="main_content"></a> <div class="row"> <!-- Main Page "Left Column" (end) --> <div class="large-3 medium-4 columns" id="neo_left_panel"> <!-- Main Page "Quick Links" Panel (begin) --> <div id="neo_quick_links" ng-controller="MainCtrl"> <form name="neoLookupForm" novalidate class="simple-form"> <div ng-class="{'error' : neoLookupForm.neoLookupStr.$invalid}"> <input type="text" ng-model="neoLookupStr" name="neoLookupStr" placeholder="Lookup NEO designation" pattern="^[0-9,A-Z,a-z,_ \.\-*?\/]+$|[A-Z,a-z][A-Z,a-z, \.'~\-]+$" ng-keyup="neoLookupForm.$valid && $event.keyCode == 13 && neoLookupValidation(neoLookupStr)"/> <small ng-show="neoLookupForm.neoLookupStr.$invalid" class="error">Invalid character in designation</small> </div> </form> <!--<input type="text" id="right-label" placeholder="Lookup NEO designation">--> <h4>Quick Links</h4> <ul class="side-nav"> <li><a href="/about/basics.html">NEO Basics</a></li> <li><a href="https://ssd.jpl.nasa.gov/sbdb_query.cgi">NEO DB Query</a></li> <li><a href="/sentry/">Sentry (impact risk)</a></li> <li><a href="/nhats/">Accessible NEAs</a></li> <li><a href="https://youtu.be/UA6voCyCW1g">Close Approach Tutorial</a></li> <li><a href="https://www.nasa.gov/planetarydefense/overview">NASA PDCO</a></li> <li><a href="https://twitter.com/asteroidwatch">Asteroid Watch on Twitter</a></li> <li><a href="http://ssd.jpl.nasa.gov/horizons.cgi">Horizons</a></li> <li><a href="http://ssd.jpl.nasa.gov/">Solar System Dynamics</a></li> </ul> </div> <hr/> <!-- Main Page "Quick Links" Panel (end) --> <!-- Main Page "Next Notable Close Approach" Panel (begin) --> <div id="next_neo_ca"> <script src="js/next_ca.js"></script> <table align="center" id="next_ca" class="no-wrap next-ca-table"></table> <p class="ca-see-more"> See our <a href="/ca/">Close Approach Tables</a> for more on this object and other NEOs. </p> </div> <hr/> <!-- Main Page "Next Notable Close Approach" Panel (end) --> <!-- Main Page "NEA Stats" Panel (begin) --> <div id="neo_stats"> <script src="js/nea_od_stats.js"></script> <h5 class="text-center">NEA Stats<br/><span class="no-wrap nea-stats-date" id="nea_stats_date"></span></h5> <table align="center" id="nea_totals" class="nea-stats-table"></table> <p class="ca-see-more"> See our <a href="/stats/">Discovery Statistics</a> page for more. </p> <table align="center" id="nea_od_stats" class="nea-stats-table"></table> <p class="ca-see-more"> </p> </div> <!--<hr/>--> <!-- Main Page "NEO Stats" Panel (end) --> </div> <!-- Main Page "Left Column" (end) --> <div class="large-9 medium-8 columns" id="neo_main_panel"> <!-- Main Page Tools Panel (begin) --> <div class="row spotlight-topics"> <ul class="small-block-grid-2 medium-block-grid-4"> <li> <a href="/fireballs/"> <div class="image-wrapper overlay-fade-in"> <img class="icon-image" src="/images/icon_fireballs.png" alt="Recent Large Meteor Explosions" /> <div class="image-overlay-content"> Recent Large Meteor Explosions </div> </div> </a> </li> <li> <div class="image-wrapper overlay-fade-in"> <img class="icon-image" src="/images/icon_sentry.png" alt="NEO Threat Assessment System" /> <a href="/sentry/"> <div class="image-overlay-content"> NEO Threat Assessment System </div> </a> </div> </li> <li> <div class="image-wrapper overlay-fade-in"> <img class="icon-image" src="/images/icon_nda.png" alt="Deflecting Earth Threatening NEOs" /> <a href="/nda/"> <div class="image-overlay-content"> Deflecting Earth Threatening NEOs </div> </a> </div> </li> <li> <div class="image-wrapper overlay-fade-in"> <img class="icon-image" src="/images/icon_stats.png" alt="NEO Discovery Statistics" /> <a href="/stats/totals.html"> <div class="image-overlay-content"> NEO Discovery Statistics </div> </a> </div> </li> </ul> <script> fontsize = function () { //var fontSize = $(".image-wrapper").height() * 0.20; // 20% of container height (not working) var fontSize = $(".image-wrapper").width() * 0.12; // 12% of container width $(".image-overlay-content").css('font-size', fontSize); }; $(window).resize(fontsize); $(document).ready(fontsize); </script> </div> <!-- Main Page Tools Panel (end) --> <!-- Top News Panel (begin) --> <div class="row top-news-panel"> <script src="js/top_news.js"></script> <div class="news-heading-main-page">Top News Stories</div> <div id="top_news"></div> <div class="row top-news top-news-archive">See the <a href="/news/">News Archive</a> for additional stories (<a href="/feed/">RSS feed</a> available).</div> </div> </div> <!-- Top News Panel (end) --> </div> <div class="row collapse site-footer"> <div class="small-12 columns"> <!-- Main Footer Content Container --> <footer class="site-footer"> <div class="row"> <div class="medium-4 columns logo-container"> <a href="/" class=""> <img src="/images/cneos_logo.png" alt="CNEOS" class="cneos-logo" /> </a> </div> <div class="medium-4 columns footer-links-container"> <ul class="no-bullet"> <li><a href="/sitemap.html">Site Map</a></li> <li><a href="https://www.jpl.nasa.gov/caltechjpl-privacy-policies-and-important-notices">Privacy</a></li> <li><a href="https://www.jpl.nasa.gov/jpl-image-use-policy">Image Policy</a></li> </ul> </div> <div class="medium-4 columns footer-credits-container"> <ul class="no-bullet footer-credits-list"> <li class="show-for-small-only"><a href="/contact/">Contact</a></li> <li class="hide-for-small-only"><a href="/contact/">Contact CNEOS</a></li> <li> <span class="footer-credits footer-credits-title">Manager:</span> <span class="footer-credits">Ryan Park</span> </li> <li> <span class="footer-credits footer-credits-title">Site Design:</span> <span class="footer-credits">Shakeh Khudikyan,</span> <span class="footer-credits">Alan Chamberlin</span> </li> <li> <span class="footer-credits footer-credits-title">URS Clearance:</span> <span class="footer-credits">CL 99-0118</span> </li> </ul> </div> </div> <script id="_fed_an_ua_tag" type="text/javascript" src="https://dap.digitalgov.gov/Universal-Federated-Analytics-Min.js?agency=NASA&subagency=CNEOS&dclink=true&sp=search,s"></script> </footer> </div> </div> <!-- Initialize Foundation JS at the end of the BODY section --> <script> $(document).foundation({ accordion: { multi_expand: true } }); // Force external links to open in a new tab/window (A.Chamberlin) $(document).ready(function() { 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