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It operates the La Silla Paranal Observatory in Chile and has its headquarters in Garching, near Munich, Germany."/> <meta name="MSSmartTagsPreventParsing" content="TRUE"/> <meta name="author" content="webteam@eso.org"/> <meta name="page-topic" content="Astronomy"/> <meta name="page-type" content="Research Organisation"/> <meta name="organisation" content="ESO, European Organisation for Astronomical Research in the Southern Hemisphere"/> <meta name="Content-Language" content="en"/> <meta name="Language" content="en"/> <meta name="publisher" content="ESO"/> <meta name="copyright" content="1999-2008 ESO"/> <meta name="revisit-after" content="1 day"/> <meta name="keywords" content="ESO, eso.org, Astronomy, Astrophysics, Astronomie, Suedsternwarte, telescopes, detectors, comets, planets, stars, galaxies, nebulae, universe, NTT, VLT, VLTI, ALMA, E-ELT, La Silla, Paranal, Garching, Chile"/> <title>ESO - E-ELT Telescope Design</title> <script type="text/javascript" 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id="headerbg_inner1"> </div> <div id="headerbg_inner2"> </div> </div> <div id="page_margins"> <div id="page" class="hold_floats"> <div id="header"> <div id="eso_header"> <table width="100%"> <tr> <td class="esologo"><a href="/web/20210411222300/http://www.eso.org/" title="ESO"><img src="/web/20210411222300im_/http://www.eso.org/i/esologo.png" alt=">European Organisation for Astronomical Research in the Southern Hemisphere"/></a></td> <td class="esologotext" width="120" valign="top"><br><p>European<br/>Southern<br/>Observatory</p></td> <td class="headcenter"> </td> <td class="headright"> <div class="pagetitle"> <h1></h1> <div id="slogan"> <h2>ESO — Reaching New Heights in Astronomy</h2> <div id="flags"> <a href="/web/20210411222300/http://www.eso.org/public/austria/"><img class="nopadding" src="/web/20210411222300im_/http://www.eso.org/i/austria.gif" title="Austria" alt="Austria" border="0" width="24" height="16"/></a> <img class="nopadding" src="/web/20210411222300im_/http://www.eso.org/i/sep1.gif" width="4"/><a href="/web/20210411222300/http://www.eso.org/public/belgium/"><img class="nopadding" src="/web/20210411222300im_/http://www.eso.org/i/belgium.gif" title="Belgium" alt="Belgium" border="0" width="24" height="16"/></a> <img class="nopadding" src="/web/20210411222300im_/http://www.eso.org/i/sep1.gif" width="4"/><a href="/web/20210411222300/http://www.eso.org/public/czechrepublic/"><img class="nopadding" src="/web/20210411222300im_/http://www.eso.org/i/czechrepublic.gif" title="Czech Republic" alt="Czech Republic" border="0" width="24" height="16"/></a> <img class="nopadding" src="/web/20210411222300im_/http://www.eso.org/i/sep1.gif" width="4"/><a href="/web/20210411222300/http://www.eso.org/public/denmark/"><img class="nopadding" src="/web/20210411222300im_/http://www.eso.org/i/denmark.gif" title="Denmark" alt="Denmark" border="0" width="24" height="16"/></a> <img class="nopadding" src="/web/20210411222300im_/http://www.eso.org/i/sep1.gif" width="4"/><a href="/web/20210411222300/http://www.eso.org/public/finland/"><img class="nopadding" src="/web/20210411222300im_/http://www.eso.org/i/finland.gif" title="Finland" alt="Finland" border="0" width="26" height="16"/></a> <img class="nopadding" src="/web/20210411222300im_/http://www.eso.org/i/sep1.gif" width="4"/><a href="/web/20210411222300/http://www.eso.org/public/france/"><img class="nopadding" src="/web/20210411222300im_/http://www.eso.org/i/france.gif" title="France" alt="France" border="0" width="24" height="16"/></a> <img class="nopadding" src="/web/20210411222300im_/http://www.eso.org/i/sep1.gif" width="4"/><a href="/web/20210411222300/http://www.eso.org/public/germany/"><img class="nopadding" src="/web/20210411222300im_/http://www.eso.org/i/germany.gif" title="Germany" alt="Germany" border="0" width="24" height="16"/></a> <img class="nopadding" src="/web/20210411222300im_/http://www.eso.org/i/sep1.gif" width="4"/><a href="/web/20210411222300/http://www.eso.org/public/ireland/"><img class="nopadding" src="/web/20210411222300im_/http://www.eso.org/i/ireland.gif" title="Ireland" alt="Ireland" border="0" width="24" height="16"/></a> <img class="nopadding" src="/web/20210411222300im_/http://www.eso.org/i/sep1.gif" width="4"/><a href="/web/20210411222300/http://www.eso.org/public/italy/"><img class="nopadding" src="/web/20210411222300im_/http://www.eso.org/i/italy.gif" title="Italy" alt="Italy" border="0" width="24" height="16"/></a> <img class="nopadding" src="/web/20210411222300im_/http://www.eso.org/i/sep1.gif" width="4"/><a href="/web/20210411222300/http://www.eso.org/public/netherlands/"><img class="nopadding" src="/web/20210411222300im_/http://www.eso.org/i/netherlands.gif" title="Netherlands" alt="Netherlands" border="0" width="24" height="16"/></a> <img class="nopadding" src="/web/20210411222300im_/http://www.eso.org/i/sep1.gif" width="4"/><a 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src="/web/20210411222300im_/http://www.eso.org/i/chile.gif" title="Chile" alt="Chile" border="0" width="24" height="16"/></a> </div> </div> </div> </div> </td> </tr> </table> </div>  </div>   <form action="/web/20210411222300/http://www.eso.org/public/about-eso/search.html" id="cse-search-box" name="search_top" method="get" class="search"> <div id="nav">   <div id="nav_main"> <ul> <li id="first"> </li> <li><a href="/web/20210411222300/http://www.eso.org/public/" title="Public">Public</a></li> <li class="topnavSelected"><a href="/web/20210411222300/http://www.eso.org/sci.html" title="Science">Science</a></li> <li><a href="/web/20210411222300/http://www.eso.org/UserPortal/" title="User Portal">User Portal</a></li> </ul> <ul class="topnav_right"> <li><a href="/web/20210411222300/http://www.eso.org/public/outreach/newsletters/esonews.html" title="Subscribe">Subscribe</a></li> <li><a href="/web/20210411222300/http://www.eso.org/sci/contacts/" title="Contact">Contact</a></li> <li><a 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href="#navigation" title="jump to navigation">jump to navigation</a> <a class="skip" href="#content" title="jump to content ">jump to content</a><div id="outer_wrapper">  <div id="main">  <div id="col1"> <div id="col1_content" class="clearfix">   <div class="smenu"> <a id="navigation" name="navigation"></a> <ul id="leftmenu"> <li class="title"><a href="/web/20210411222300/http://www.eso.org/sci/">Science Users Information</a></li> <li>  <ul id="leftnav"><li class="std0"><a href="/web/20210411222300/http://www.eso.org/sci/facilities/index.html">Observing Facilities</a><ul class="sub1"><li class="std1"><a href="/web/20210411222300/http://www.eso.org/sci/facilities/lpo/">La Silla Paranal Observatory</a></li><li class="std1"><a href="/web/20210411222300/http://www.eso.org/sci/facilities/paranal/">Paranal Facilities</a></li><li class="std1"><a href="/web/20210411222300/http://www.eso.org/sci/facilities/lasilla/">La Silla Facilities</a></li><li class="std1"><a 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href="/web/20210411222300/http://www.eso.org/sci/facilities/eelt/site/index.html">Site</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/facilities/eelt/docs/index.html">Publications and Documents</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/facilities/eelt/links/index.html">Gallery and Links</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/facilities/eelt/internal/index.html">Internal Access</a></li></ul></li><li class="std1"><a href="/web/20210411222300/http://www.eso.org/sci/facilities/develop.html">Instrumentation Development</a><ul class="sub2"><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/facilities/develop/news.html">Instrumentation News</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/facilities/develop/instruments.html">Instruments Projects</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/facilities/develop/detectors.html">Detectors and Controllers</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/facilities/develop/ao.html">Adaptive Optics</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/facilities/develop/lgsf.html">Laser Guide Stars</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/facilities/develop/integration.html">Integration and Cryo-vacuum</a></li></ul></li></ul></li><li class="std0"><a href="/web/20210411222300/http://www.eso.org/sci/observing.html">Observing with ESO Telescopes</a><ul class="sub1"><li class="std1"><a href="/web/20210411222300/http://www.eso.org/sci/observing/policies.html">Policies and Procedures</a><ul class="sub2"><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/observing/policies/cou996-rev.pdf">Science Operations Policy</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/observing/policies/ddt/ddt_policy.html">Director's Discretionary Time </a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/observing/policies/too/too_policy.html">Target of Opportunity</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/observing/policies/gto/gto_policy.html">Guaranteed Time Observations</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/observing/PublicSurveys/policies.html">Public Surveys</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/observing/policies/publications.html">Publications with ESO Data</a></li></ul></li><li class="std1"><a href="/web/20210411222300/http://www.eso.org/sci/observing/teles-alloc.html">Telescope Time Allocation</a><ul class="sub2"><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/observing/teles-alloc/telescopeschedule.html">Telescope Schedule</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/observing/teles-alloc/lp.html">Large Programmes</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/observing/teles-alloc/too.html">ToO Programmes</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/observing/teles-alloc/ddt.html">DDT Programmes</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/observing/teles-alloc/gto.html">GTO Programmes</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/observing/teles-alloc/gtc.html">ESO/GTC Programmes</a></li></ul></li><li class="std1"><a href="/web/20210411222300/http://www.eso.org/sci/observing/phase1.html">Phase 1 Proposals</a><ul class="sub2"><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/observing/phase1/proposals.html">Applying for Observing Time</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/observing/phase1/proposals/esoform.html">Proposal Package</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/observing/phase1/proposals/opc-categories.html">Proposal Categories</a></li></ul></li><li class="std1"><a href="/web/20210411222300/http://www.eso.org/sci/observing/phase2.html">Phase 2 Preparation</a><ul class="sub2"><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/observing/phase2/P2PPTool.html">The P2PP Tool</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/observing/phase2/SMGuidelines.html">Service Mode Guidelines</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/observing/phase2/VMGuidelines.html">Visitor Mode Guidelines</a></li></ul></li><li class="std1"><a href="/web/20210411222300/http://www.eso.org/sci/observing/phase3.html">Phase 3</a></li><li class="std1"><a href="/web/20210411222300/http://www.eso.org/sci/observing/PublicSurveys.html">Public Surveys</a><ul class="sub2"><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/observing/PublicSurvey/sciencePublicSurveys.html">Public Survey Projects</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/observing/PublicSurvey/phase2publicsurveys.html">Public Surveys Phase 2</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/observing/PublicSurvey/policies.html">Public Surveys Policies</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/observing/PublicSurvey/protected-targets.html">Protected Targets</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/observing/PublicSurvey/useful_links.html">Useful Links</a></li></ul></li><li class="std1"><a href="/web/20210411222300/http://www.eso.org/sci/observing/tools.html">Observing Tools and Services</a><ul class="sub2"><li class="std2"><a href="//web.archive.org/web/20210411222300/http://www.eso.org/observing/etc/">ESO ETC's</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/http://archive.eso.org/archive/instruments/">Instrumental Characteristics</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/observing/tools/catalogues.html">Archives and Catalogues</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/observing/tools/ephemeris.html">Ephemerides and Calculators</a></li><li class="std2"><a href="//web.archive.org/web/20210411222300/http://archive.eso.org/apps/mag2flux/">Mag/Flux Converter</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/observing/tools/weather.html">Weather Images</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/observing/tools/astclim.html">Astroclimatology</a></li><li class="std2"><a href="//web.archive.org/web/20210411222300/http://www.ls.eso.org/lasilla/dimm/meteo.html">Meteo Information</a></li></ul></li><li class="std1"><a href="/web/20210411222300/http://www.eso.org/sci/observing/visas.html">Visiting Astronomers</a><ul class="sub2"><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/observing/travel/visas-instruc.html">General Instructions</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/facilities/paranal/sciops/VA_GeneralInfo.html">Guidelines Paranal</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/facilities/lasilla/sciops/VA_GeneralInfo.html">Guidelines La Silla</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/facilities/paranal/sciops/EoM/">End-of-Run Report Paranal</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/php/sciops/lasilla/sciops/EoM/">End-of-Run Report La Silla</a></li></ul></li></ul></li><li class="std0"><a href="/web/20210411222300/http://www.eso.org/sci/software/">Science Software</a><ul class="sub1"><li class="std1"><a href="/web/20210411222300/http://www.eso.org/sci/software/pipelines/">Instrument Pipelines</a></li><li class="std1"><a href="/web/20210411222300/http://www.eso.org/sci/software/cpl/">Common Pipeline Library</a></li><li class="std1"><a href="/web/20210411222300/http://www.eso.org/sci/software/scisoft/">Scisoft Collection</a></li><li class="std1"><a href="/web/20210411222300/http://www.eso.org/sci/software/esomidas/">ESO-MIDAS</a></li><li class="std1"><a href="/web/20210411222300/http://www.eso.org/sci/software/eclipse/">Eclipse</a></li><li class="std1"><a href="/web/20210411222300/http://www.eso.org/sci/software/gasgano/">Gasgano</a></li><li class="std1"><a href="/web/20210411222300/http://www.eso.org/sci/software/esoreflex/">ESO Reflex</a></li></ul></li><li class="std0"><a href="/web/20210411222300/http://www.eso.org/sci/data-processing.html">Data Handling and Products</a><ul class="sub1"><li class="std1"><a href="/web/20210411222300/http://www.eso.org/sci/data-processing/quality.html">Quality Control and Data Processing</a></li><li class="std1"><a href="/web/20210411222300/http://www.eso.org/sci/data-processing/pipelines.html ">Data Pipelines and Calibrations</a></li><li class="std1"><a href="/web/20210411222300/http://www.eso.org/sci/data-processing/trending.html "> Trend Analysis</a></li><li class="std1"><a href="/web/20210411222300/http://www.eso.org/sci/data-processing/packages.html ">Data Packages</a></li><li class="std1"><a href="/web/20210411222300/http://www.eso.org/sci/data-processing/forum.html">Science Data Products Forum</a></li></ul></li><li class="std0"><a href="//web.archive.org/web/20210411222300/http://archive.eso.org/">Science Archive Facility</a><ul class="sub1"><li class="std1"><a href="//web.archive.org/web/20210411222300/http://archive.eso.org/cms/data-portal.html">Data Portal</a></li><li class="std1"><a href="//web.archive.org/web/20210411222300/http://archive.eso.org/cms/eso-data.html">ESO Data</a></li><li class="std1"><a href="//web.archive.org/web/20210411222300/http://archive.eso.org/cms/hubble-space-telescope-data.html">Hubble Space Telescope Data</a></li><li class="std1"><a href="//web.archive.org/web/20210411222300/http://archive.eso.org/cms/virtual-observatory-tools.html">Virtual Observatory Tools</a></li><li class="std1"><a href="//web.archive.org/web/20210411222300/http://archive.eso.org/cms/catalogs-dss.html">Catalogues, Plates and DSS</a></li><li class="std1"><a href="//web.archive.org/web/20210411222300/http://archive.eso.org/cms/tools-documentation.html">Tools and Documentation</a></li><li class="std1"><a href="//web.archive.org/web/20210411222300/http://archive.eso.org/cms/related-external-services.html">Related External Services</a></li><li class="std1"><a href="//web.archive.org/web/20210411222300/http://archive.eso.org/cms/eso-hst-image-galleries.html">ESO and HST Image Galleries</a></li><li class="std1"><a href="//web.archive.org/web/20210411222300/http://archive.eso.org/cms/eso-archive-news.html">News and Updates</a></li><li class="std1"><a href="//web.archive.org/web/20210411222300/http://archive.eso.org/cms/eso-data-access-policy.html">ESO Data Access Policy</a></li></ul></li><li class="std0"><a href="/web/20210411222300/http://www.eso.org/sci/activities.html">Science Activities</a><ul class="sub1"><li class="std1"><a href="/web/20210411222300/http://www.eso.org/sci/activities/personnel.html">Science Staff</a></li><li class="std1"><a href="/web/20210411222300/http://www.eso.org/sci/activities/garching.html">Science in Garching</a><ul class="sub2"><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/activities/garching/projects.html">Science Projects</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/activities/garching/personnel.html">Staff Garching</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/activities/garching/personnel/visitors.html">Scientific Visitors</a></li></ul></li><li class="std1"><a href="/web/20210411222300/http://www.eso.org/sci/activities/santiago.html">Science in Santiago</a><ul class="sub2"><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/activities/santiago/projects.html">Science Projects</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/activities/santiago/personnel.html">Staff Santiago/Chile</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/activities/santiago/personnel/visitors.html">Scientific Visitors</a></li></ul></li><li class="std1"><a href="/web/20210411222300/http://www.eso.org/sci/activities/FeSt-overview.html">Fellowships and Studentships</a></li><li class="std1"><a href="/web/20210411222300/http://www.eso.org/sci/activities/vltcomm.html">VLT Commissioning</a><ul class="sub2"><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/activities/vltcomm/flames/">FLAMES</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/activities/vltcomm/naco/">NACO</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/activities/vltcomm/prima/">PRIMA</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/activities/vltcomm/uves/">UVES</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/activities/vltcomm/xshooter/">XSHOOTER</a></li></ul></li><li class="std1"><a href="/web/20210411222300/http://www.eso.org/sci/activities/vltsv.html">VLT/VLTI Science Verification</a><ul class="sub2"><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/activities/vltsv/amber.html">AMBER</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/activities/vltsv/criressv.html">CRIRES</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/activities/vltsv/flamessv.html">FLAMES</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/activities/vltsv/fors1-isaac.html">FORS1 and ISAAC</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/activities/vltsv/fors2-uves.html">FORS2 and UVES</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/activities/vltsv/hawkisv.html">HAWK-I</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/activities/vltsv/midi.html">MIDI</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/activities/vltsv/nacosv.html">NACO</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/activities/vltsv/sinfonisv.html">SINFONI</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/activities/vltsv/vimossv.html">VIMOS</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/activities/vltsv/visirsv.html">VISIR</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/activities/vltsv/xshootersv.html">XSHOOTER</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/activities/vltsv/mad.html">MAD</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/activities/vltsv/ut1sv.html">UT1 - Test Camera</a></li></ul></li><li class="std1"><a href="/web/20210411222300/http://www.eso.org/sci/activities/vistasv.html">VISTA Science Verification</a></li><li class="std1"><a href="/web/20210411222300/http://www.eso.org/sci/activities/apexsv.html">APEX Science Verification</a><ul class="sub2"><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/activities/apexsv/apex2asv.html">APEX 2A</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/activities/apexsv/labocasv.html">LABOCA</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/activities/apexsv/shfisv.html">SHFI</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/activities/apexsv/sabocasv.html">SABOCA</a></li></ul></li></ul></li><li class="std0"><a href="/web/20210411222300/http://www.eso.org/sci/meetings.html">Science and Technical Meetings</a><ul class="sub1"><li class="std1"><a href="/web/20210411222300/http://www.eso.org/sci/meetings/garching.html">Seminars in Garching</a></li><li class="std1"><a href="/web/20210411222300/http://www.eso.org/sci/meetings/santiago.html">Seminars in Santiago</a></li><li class="std1"><a href="/web/20210411222300/http://www.eso.org/sci/meetings/conferences.html">Conferences and Workshops</a></li></ul></li><li class="std0"><a href="/web/20210411222300/http://www.eso.org/sci/itservices.html">IT Services</a></li><li class="std0"><a href="/web/20210411222300/http://www.eso.org/sci/libraries/">Libraries</a><ul class="sub1"><li class="std1"><a href="//web.archive.org/web/20210411222300/http://eso.koha-ptfs.eu/">Libraries Catalog</a></li><li class="std1"><a href="//web.archive.org/web/20210411222300/http://eso.koha-ptfs.eu/cgi-bin/koha/sco/sco-main.pl">Library Self Checkout</a></li><li class="std1"><a href="/web/20210411222300/http://www.eso.org/sci/libraries/ejournals.html">Electronic Journals</a></li><li class="std1"><a href="/web/20210411222300/http://www.eso.org/sci/libraries/ebooks.html">Electronic Books</a></li><li class="std1"><a href="//web.archive.org/web/20210411222300/http://telbib.eso.org/">ESO Telescope Bibliography</a></li><li class="std1"><a href="/web/20210411222300/http://www.eso.org/sci/libraries/useful_links.html">Information Resources</a></li></ul></li><li class="std0"><a href="/web/20210411222300/http://www.eso.org/sci/publications.html">Publications</a><ul class="sub1"><li class="std1"><a href="/web/20210411222300/http://www.eso.org/sci/publications/announcements.html">Science Announcements</a></li><li class="std1"><a href="/web/20210411222300/http://www.eso.org/sci/publications/newsletter.html">ESO Science Newsletter</a><ul class="sub2"><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/publications/newsletter/about-newsletter.html">About the Newsletter</a></li><li class="std2"><a href="/web/20210411222300/http://www.eso.org/sci/publications/enews.html">Archive of the ESO Enews</a></li></ul></li><li class="std1"><a href="/web/20210411222300/http://www.eso.org/sci/publications/messenger/">The Messenger</a></li><li class="std1"><a href="/web/20210411222300/http://www.eso.org/public/outreach/products/publ/ann-report/">ESO Annual Reports</a></li></ul></li><li class="std0"><a href="/web/20210411222300/http://www.eso.org/sci/vacancies.html">Job Opportunities</a></li></ul>  </li>  </ul>  </div>  </div>  </div>  <a id="content" name="content"></a> <div id="col3"> <div id="col3_content" class="clearfix"> <h1>E-ELT TELESCOPE DESIGN</h1> <table width="900" border="0" frame="void" align="center"> <tr> <td width="400" valign="middle"><p align="left"><img src="/web/20210411222300im_/http://www.eso.org/sci/facilities/eelt/telescope/images/elt-illustration-5k-potw.jpg" alt="E-ELT design" width="400"/></p></td> <td width="500" valign="top"><p></p><p align="justify">  <p align="justify"> Between the end of 2010 and the summer 2011, the E-ELT project extended the detailed design phase in order to consider the recommendations of the E-ELT Design Review, and in June 2011 the ESO Council endorsed a revised baseline design for the E-ELT. <br><br> The overall concept of the 40-metre-class telescope remains unchanged. A slight reduction of the diameter of the primary mirror to approximately 39 metres combined with a faster f-ratio, allows a more compact dome and main structure. This leads to a significant cost saving, as well as reduced risk on major items such as the secondary mirror. </p> <p align="justify"> </p> <p align="justify"> A summary of the telescope characteristics can be found below, including links to more detailed descriptions. </p> <h2> The telescope structure and design </h2> <p align="justify"> A general principle applied at all levels throughout the design is that technical solutions rely on proven technologies to the maximum possible extent. </p> <p align="justify"> The E-ELT is a 40-m class, fully steerable telescope, with integrated wavefront control. The <a href="/web/20210411222300/http://www.eso.org/sci/facilities/eelt/telescope/mirrors">optics</a> are mounted on an altitude azimuth telescope <a href="/web/20210411222300/http://www.eso.org/sci/facilities/eelt/telescope/mstructure">main structure</a>, with two massive cradles for the elevation motions and azimuth tracks. The main structure weighs approximately 2800 tonnes. </p> <p align="justify"> The E-ELT <a href="/web/20210411222300/http://www.eso.org/sci/facilities/eelt/telescope/design">optical design</a> differs from other ELT designs mostly by including adaptive optics into the telescope. This drove the optical layout to five mirrors: a three mirror anastigmat with two flat folding mirrors providing the adaptive optics. This novel five-mirror design results in an exceptional image quality, with no significant aberrations in the 10-arcmin field of view. <br> The major challenges that have been addressed in the design are the need to keep the primary mirror segments within a reasonable range from their prescribed locations and the need to minimize the deflections, both static and dynamic, of the secondary mirror. </p> <p align="justify"> Two Nasmyth platforms are accomodated by the structure, at either side of the rotatable telescope. Each platform is about the size of a tennis court and can host several <a href="/web/20210411222300/http://www.eso.org/sci/facilities/eelt/instrumentation">instruments</a>. </p> <p align="justify"> Several designs were considered for the telescope enclosure. The project settled for a rather classical <a href="/web/20210411222300/http://www.eso.org/sci/facilities/eelt/telescope/dome/">dome</a> design. </p>         <br> </td> </tr> </table> <br> </p> </div>   <div id="ie_clearing"> </div> </div>    <div id="footer">  <div id="footerupdate"> <table><tr><th>Last Update: 23.08.12 © ESO </th> <td> <a href="/web/20210411222300/http://www.eso.org/public/contactform.html?area=science">Send us your comments!</a> | <a href="/web/20210411222300/http://www.eso.org/sci/enews/">Subscribe to Newsletter</a> | <a href="/web/20210411222300/http://www.eso.org/sci/privacy/index.html">Privacy Statement</a></td> </tr></table> </div> </div>  </div>  </div>  </div>   <script> (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){ (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o), m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m) })(window,document,'script','//web.archive.org/web/20210411222300/http://www.google-analytics.com/analytics.js','ga'); ga('create', 'UA-1965004-1', 'auto'); ga('send', 'pageview'); </script>   <script type="text/javascript"> var _paq = _paq || []; /* tracker methods like "setCustomDimension" should be called before "trackPageView" */ _paq.push(['trackPageView']); _paq.push(['enableLinkTracking']); (function() { var u="/mtmo/"; _paq.push(['setTrackerUrl', u+'piwik.php']); _paq.push(['setSiteId', '1']); var d=document, g=d.createElement('script'), s=d.getElementsByTagName('script')[0]; g.type='text/javascript'; g.async=true; g.defer=true; g.src=u+'piwik.js'; s.parentNode.insertBefore(g,s); })(); </script>  </body> </html>