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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/20210415190955/http://www.eso.org/" title="ESO"><img src="/web/20210415190955im_/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/20210415190955/http://www.eso.org/public/austria/"><img class="nopadding" src="/web/20210415190955im_/http://www.eso.org/i/austria.gif" title="Austria" alt="Austria" border="0" width="24" height="16"/></a> <img class="nopadding" 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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/20210415190955/http://www.eso.org/sci/">Science Users Information</a></li> <li>  <ul id="leftnav"><li class="std0"><a href="/web/20210415190955/http://www.eso.org/sci/facilities/index.html">Observing Facilities</a><ul class="sub1"><li class="std1"><a href="/web/20210415190955/http://www.eso.org/sci/facilities/lpo/">La Silla Paranal Observatory</a></li><li class="std1"><a href="/web/20210415190955/http://www.eso.org/sci/facilities/paranal/">Paranal Facilities</a></li><li class="std1"><a href="/web/20210415190955/http://www.eso.org/sci/facilities/lasilla/">La Silla Facilities</a></li><li class="std1"><a href="//web.archive.org/web/20210415190955/http://www.apex-telescope.org/">APEX</a></li><li class="std1"><a 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href="/web/20210415190955/http://www.eso.org/sci/facilities/develop/lgsf.html">Laser Guide Stars</a></li><li class="std2"><a href="/web/20210415190955/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/20210415190955/http://www.eso.org/sci/observing.html">Observing with ESO Telescopes</a><ul class="sub1"><li class="std1"><a href="/web/20210415190955/http://www.eso.org/sci/observing/policies.html">Policies and Procedures</a><ul class="sub2"><li class="std2"><a href="/web/20210415190955/http://www.eso.org/sci/observing/policies/cou996-rev.pdf">Science Operations Policy</a></li><li class="std2"><a href="/web/20210415190955/http://www.eso.org/sci/observing/policies/ddt/ddt_policy.html">Director's Discretionary Time </a></li><li class="std2"><a href="/web/20210415190955/http://www.eso.org/sci/observing/policies/too/too_policy.html">Target of Opportunity</a></li><li class="std2"><a href="/web/20210415190955/http://www.eso.org/sci/observing/policies/gto/gto_policy.html">Guaranteed Time Observations</a></li><li class="std2"><a href="/web/20210415190955/http://www.eso.org/sci/observing/PublicSurveys/policies.html">Public Surveys</a></li><li class="std2"><a href="/web/20210415190955/http://www.eso.org/sci/observing/policies/publications.html">Publications with ESO Data</a></li></ul></li><li class="std1"><a href="/web/20210415190955/http://www.eso.org/sci/observing/teles-alloc.html">Telescope Time Allocation</a><ul class="sub2"><li class="std2"><a href="/web/20210415190955/http://www.eso.org/sci/observing/teles-alloc/telescopeschedule.html">Telescope Schedule</a></li><li class="std2"><a href="/web/20210415190955/http://www.eso.org/sci/observing/teles-alloc/lp.html">Large Programmes</a></li><li class="std2"><a href="/web/20210415190955/http://www.eso.org/sci/observing/teles-alloc/too.html">ToO Programmes</a></li><li class="std2"><a href="/web/20210415190955/http://www.eso.org/sci/observing/teles-alloc/ddt.html">DDT Programmes</a></li><li class="std2"><a href="/web/20210415190955/http://www.eso.org/sci/observing/teles-alloc/gto.html">GTO Programmes</a></li><li class="std2"><a href="/web/20210415190955/http://www.eso.org/sci/observing/teles-alloc/gtc.html">ESO/GTC Programmes</a></li></ul></li><li class="std1"><a href="/web/20210415190955/http://www.eso.org/sci/observing/phase1.html">Phase 1 Proposals</a><ul class="sub2"><li class="std2"><a href="/web/20210415190955/http://www.eso.org/sci/observing/phase1/proposals.html">Applying for Observing Time</a></li><li class="std2"><a href="/web/20210415190955/http://www.eso.org/sci/observing/phase1/proposals/esoform.html">Proposal Package</a></li><li class="std2"><a href="/web/20210415190955/http://www.eso.org/sci/observing/phase1/proposals/opc-categories.html">Proposal Categories</a></li></ul></li><li class="std1"><a href="/web/20210415190955/http://www.eso.org/sci/observing/phase2.html">Phase 2 Preparation</a><ul class="sub2"><li class="std2"><a href="/web/20210415190955/http://www.eso.org/sci/observing/phase2/P2PPTool.html">The P2PP Tool</a></li><li class="std2"><a href="/web/20210415190955/http://www.eso.org/sci/observing/phase2/SMGuidelines.html">Service Mode Guidelines</a></li><li class="std2"><a href="/web/20210415190955/http://www.eso.org/sci/observing/phase2/VMGuidelines.html">Visitor Mode Guidelines</a></li></ul></li><li class="std1"><a href="/web/20210415190955/http://www.eso.org/sci/observing/phase3.html">Phase 3</a></li><li class="std1"><a href="/web/20210415190955/http://www.eso.org/sci/observing/PublicSurveys.html">Public Surveys</a><ul class="sub2"><li class="std2"><a href="/web/20210415190955/http://www.eso.org/sci/observing/PublicSurvey/sciencePublicSurveys.html">Public Survey Projects</a></li><li class="std2"><a href="/web/20210415190955/http://www.eso.org/sci/observing/PublicSurvey/phase2publicsurveys.html">Public Surveys Phase 2</a></li><li class="std2"><a href="/web/20210415190955/http://www.eso.org/sci/observing/PublicSurvey/policies.html">Public Surveys Policies</a></li><li class="std2"><a href="/web/20210415190955/http://www.eso.org/sci/observing/PublicSurvey/protected-targets.html">Protected Targets</a></li><li class="std2"><a href="/web/20210415190955/http://www.eso.org/sci/observing/PublicSurvey/useful_links.html">Useful Links</a></li></ul></li><li class="std1"><a href="/web/20210415190955/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/20210415190955/http://www.eso.org/observing/etc/">ESO ETC's</a></li><li class="std2"><a href="/web/20210415190955/http://www.eso.org/http://archive.eso.org/archive/instruments/">Instrumental Characteristics</a></li><li class="std2"><a href="/web/20210415190955/http://www.eso.org/sci/observing/tools/catalogues.html">Archives and Catalogues</a></li><li class="std2"><a href="/web/20210415190955/http://www.eso.org/sci/observing/tools/ephemeris.html">Ephemerides and Calculators</a></li><li class="std2"><a href="//web.archive.org/web/20210415190955/http://archive.eso.org/apps/mag2flux/">Mag/Flux Converter</a></li><li class="std2"><a href="/web/20210415190955/http://www.eso.org/sci/observing/tools/weather.html">Weather Images</a></li><li class="std2"><a href="/web/20210415190955/http://www.eso.org/sci/observing/tools/astclim.html">Astroclimatology</a></li><li class="std2"><a href="//web.archive.org/web/20210415190955/http://www.ls.eso.org/lasilla/dimm/meteo.html">Meteo Information</a></li></ul></li><li class="std1"><a href="/web/20210415190955/http://www.eso.org/sci/observing/visas.html">Visiting Astronomers</a><ul class="sub2"><li class="std2"><a href="/web/20210415190955/http://www.eso.org/sci/observing/travel/visas-instruc.html">General Instructions</a></li><li class="std2"><a href="/web/20210415190955/http://www.eso.org/sci/facilities/paranal/sciops/VA_GeneralInfo.html">Guidelines Paranal</a></li><li class="std2"><a href="/web/20210415190955/http://www.eso.org/sci/facilities/lasilla/sciops/VA_GeneralInfo.html">Guidelines La Silla</a></li><li class="std2"><a href="/web/20210415190955/http://www.eso.org/sci/facilities/paranal/sciops/EoM/">End-of-Run Report Paranal</a></li><li class="std2"><a href="/web/20210415190955/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/20210415190955/http://www.eso.org/sci/software/">Science Software</a><ul class="sub1"><li class="std1"><a href="/web/20210415190955/http://www.eso.org/sci/software/pipelines/">Instrument Pipelines</a></li><li class="std1"><a href="/web/20210415190955/http://www.eso.org/sci/software/cpl/">Common Pipeline Library</a></li><li class="std1"><a href="/web/20210415190955/http://www.eso.org/sci/software/scisoft/">Scisoft Collection</a></li><li class="std1"><a href="/web/20210415190955/http://www.eso.org/sci/software/esomidas/">ESO-MIDAS</a></li><li class="std1"><a href="/web/20210415190955/http://www.eso.org/sci/software/eclipse/">Eclipse</a></li><li class="std1"><a href="/web/20210415190955/http://www.eso.org/sci/software/gasgano/">Gasgano</a></li><li class="std1"><a href="/web/20210415190955/http://www.eso.org/sci/software/esoreflex/">ESO Reflex</a></li></ul></li><li class="std0"><a href="/web/20210415190955/http://www.eso.org/sci/data-processing.html">Data Handling and Products</a><ul class="sub1"><li class="std1"><a href="/web/20210415190955/http://www.eso.org/sci/data-processing/quality.html">Quality Control and Data Processing</a></li><li class="std1"><a 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href="/web/20210415190955/http://www.eso.org/sci/activities/vltsv/flamessv.html">FLAMES</a></li><li class="std2"><a href="/web/20210415190955/http://www.eso.org/sci/activities/vltsv/fors1-isaac.html">FORS1 and ISAAC</a></li><li class="std2"><a href="/web/20210415190955/http://www.eso.org/sci/activities/vltsv/fors2-uves.html">FORS2 and UVES</a></li><li class="std2"><a href="/web/20210415190955/http://www.eso.org/sci/activities/vltsv/hawkisv.html">HAWK-I</a></li><li class="std2"><a href="/web/20210415190955/http://www.eso.org/sci/activities/vltsv/midi.html">MIDI</a></li><li class="std2"><a href="/web/20210415190955/http://www.eso.org/sci/activities/vltsv/nacosv.html">NACO</a></li><li class="std2"><a href="/web/20210415190955/http://www.eso.org/sci/activities/vltsv/sinfonisv.html">SINFONI</a></li><li class="std2"><a href="/web/20210415190955/http://www.eso.org/sci/activities/vltsv/vimossv.html">VIMOS</a></li><li class="std2"><a href="/web/20210415190955/http://www.eso.org/sci/activities/vltsv/visirsv.html">VISIR</a></li><li class="std2"><a href="/web/20210415190955/http://www.eso.org/sci/activities/vltsv/xshootersv.html">XSHOOTER</a></li><li class="std2"><a href="/web/20210415190955/http://www.eso.org/sci/activities/vltsv/mad.html">MAD</a></li><li class="std2"><a href="/web/20210415190955/http://www.eso.org/sci/activities/vltsv/ut1sv.html">UT1 - Test Camera</a></li></ul></li><li class="std1"><a href="/web/20210415190955/http://www.eso.org/sci/activities/vistasv.html">VISTA Science Verification</a></li><li class="std1"><a href="/web/20210415190955/http://www.eso.org/sci/activities/apexsv.html">APEX Science Verification</a><ul class="sub2"><li class="std2"><a href="/web/20210415190955/http://www.eso.org/sci/activities/apexsv/apex2asv.html">APEX 2A</a></li><li class="std2"><a href="/web/20210415190955/http://www.eso.org/sci/activities/apexsv/labocasv.html">LABOCA</a></li><li class="std2"><a 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href="//web.archive.org/web/20210415190955/http://eso.koha-ptfs.eu/">Libraries Catalog</a></li><li class="std1"><a href="//web.archive.org/web/20210415190955/http://eso.koha-ptfs.eu/cgi-bin/koha/sco/sco-main.pl">Library Self Checkout</a></li><li class="std1"><a href="/web/20210415190955/http://www.eso.org/sci/libraries/ejournals.html">Electronic Journals</a></li><li class="std1"><a href="/web/20210415190955/http://www.eso.org/sci/libraries/ebooks.html">Electronic Books</a></li><li class="std1"><a href="//web.archive.org/web/20210415190955/http://telbib.eso.org/">ESO Telescope Bibliography</a></li><li class="std1"><a href="/web/20210415190955/http://www.eso.org/sci/libraries/useful_links.html">Information Resources</a></li></ul></li><li class="std0"><a href="/web/20210415190955/http://www.eso.org/sci/publications.html">Publications</a><ul class="sub1"><li class="std1"><a href="/web/20210415190955/http://www.eso.org/sci/publications/announcements.html">Science Announcements</a></li><li class="std1"><a href="/web/20210415190955/http://www.eso.org/sci/publications/newsletter.html">ESO Science Newsletter</a><ul class="sub2"><li class="std2"><a href="/web/20210415190955/http://www.eso.org/sci/publications/newsletter/about-newsletter.html">About the Newsletter</a></li><li class="std2"><a href="/web/20210415190955/http://www.eso.org/sci/publications/enews.html">Archive of the ESO Enews</a></li></ul></li><li class="std1"><a href="/web/20210415190955/http://www.eso.org/sci/publications/messenger/">The Messenger</a></li><li class="std1"><a href="/web/20210415190955/http://www.eso.org/public/outreach/products/publ/ann-report/">ESO Annual Reports</a></li></ul></li><li class="std0"><a href="/web/20210415190955/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>THE EUROPEAN EXTREMELY LARGE TELESCOPE ("ELT") PROJECT</h1> <img src="/web/20210415190955im_/http://www.eso.org/sci/facilities/eelt/images/e-elt_hex_06.jpg" width="300" class="float_right"> <p class="firstarticle" align="justify"> The European Extremely Large Telescope (ELT) is a revolutionary scientific project for a 40m-class telescope that will allow us to address many of the most pressing unsolved questions about our Universe. </p> <p align="justify"> The ELT will be the largest optical/near-infrared telescope in the world and will gather 13 times more light than the largest optical telescopes existing today. The ELT will be able to correct for the atmospheric distortions (i.e., fully adaptive and diffraction-limited) from the start, providing images 16 times sharper than those from the Hubble Space Telescope. The ELT will vastly advance astrophysical knowledge by enabling detailed studies of planets around other stars, the first galaxies in the Universe, super-massive black holes, and the nature of the Universe's dark sector (<a href="science/">more</a>). </p> <p align="justify"> The ELT project is included in <a href="https://web.archive.org/web/20210415190955/ftp://ftp.cordis.europa.eu/pub/era/docs/esfri_list_opportunities_290305.pdf">the European Strategy Forum on Research Infrastructures (ESFRI) List of Opportunities</a>. It has also been ranked in the 2010-2025 <a href="https://web.archive.org/web/20210415190955/http://www.astronet-eu.org/IMG/pdf/Astronet-Brochure_light.pdf">ASTRONET European strategic planning</a> as one of two clear top priorities for future ground-based astronomical infrastructures. </p> <a href="/web/20210415190955/http://www.eso.org/public/products/books/book_0046/"><img src="/web/20210415190955im_/http://www.eso.org/sci/facilities/eelt/images/constr_prop_cover.gif" width="300" class="float_left"></a> <p align="justify"> The project has completed the ELT's detailed design, which passed the Final Design Review successfully in September 2010. Between the end of 2010 and the summer of 2011 the ELT project extended the detailed design phase in order to consider the recommendations of the ELT Design Review. The main goals were the reduction of risk by optimising the cost and constraining the schedule in order to ensure that ESO can further expand its leading role in astronomy by constructing the world’s first extremely large telescope. </p> <p align="justify"> In June 2011 <a href="/web/20210415190955/http://www.eso.org/public/announcements/ann11034/">ESO Council endorsed a revised baseline design for the ELT</a>. This led to a significant cost saving and to a reduction of risk on major items such as the secondary mirror. </p>  <p align="justify"> Preparatory <a href="/web/20210415190955/http://www.eso.org/public/news/eso1150/">construction work on some of the ELT's first elements</a> has commenced in early 2012 (<a href="/web/20210415190955/http://www.eso.org/public/announcements/ann12032/">more</a>). </p> <p align="justify"> In December 2012 <a href="/web/20210415190955/http://www.eso.org/public/announcements/ann12096/">ESO Council fully approved the ELT Programme</a> (<a href="/web/20210415190955/http://www.eso.org/public/announcements/ann13019/">more</a>, <a href="/web/20210415190955/http://www.eso.org/public/announcements/ann13033/">more</a>, <a href="/web/20210415190955/http://www.eso.org/public/announcements/ann13042/">even more</a>, <a href="/web/20210415190955/http://www.eso.org/public/announcements/ann14044/">still more</a>). On-site work <a href="/web/20210415190955/http://www.eso.org/public/announcements/ann14019/">began</a> in March 2014, with a <a href="/web/20210415190955/http://www.eso.org/public/news/eso1419/">groundbreaking event</a> in June 2014 (<a href="/web/20210415190955/http://www.eso.org/public/announcements/ann14050/">more</a>). </p> <p align="justify"> In December 2014 <a href="/web/20210415190955/http://www.eso.org/public/news/eso1440/">ESO Council approved the construction of the ELT in two phases, and authorised spending on Phase 1</a>. The construction of the ELT is now in full swing. </p> <p> Also in December 2014 a new policy for the awarding of GTO time on the ELT was approved by Council at its meeting. See the <a href="https://web.archive.org/web/20210415190955/https://www.eso.org/public/about-eso/committees/cou/cou-133rd/external/Cou_1543_Public_EELT_GTO_Policy_051214.pdf">Policy Document</a>.</p> <p align="justify"> The ELT is planned to start operations as an integrated part of the Paranal Observatory in 2025. </p> <p> <p class="important" align="center">The European Extremely Large Telescope — the World’s Biggest Eye on the Sky</p> </p> <p style="clear:both"> </p> <table width="900" border="0" frame="void" align="center"> <tr> <td> <h2>News</h2> <ul> <li>[09 Jan 2018] <a href="/web/20210415190955/http://www.eso.org/public/news/eso1801">First ELT Main Mirror Segments Successfully Cast</a></li> <li>[30 May 2017] <a href="/web/20210415190955/http://www.eso.org/public/news/eso1717">Contract Signed for ELT’s Gigantic Primary Mirror</a></li> <li>[26 May 2017] <a href="/web/20210415190955/http://www.eso.org/public/news/eso1716">First Stone Ceremony for ESO's Extremely Large Telescope</a></li> <li>[22 May 2017] <a href="/web/20210415190955/http://www.eso.org/public/news/eso1715">Secondary Mirror of ELT Successfully Cast</a></li> <li>[18 Jan 2017] <a href="/web/20210415190955/http://www.eso.org/public/news/eso1704">Contracts Signed for ELT Mirrors and Sensors</a></li> <li>[25 May 2016] <a href="/web/20210415190955/http://www.eso.org/public/news/eso1617">ESO Signs Contract for ELT Dome and Telescope Structure</a></li> <li>[05 Dec 2014] <a href="/web/20210415190955/http://www.eso.org/public/news/eso1440/">Two-phase construction plan approved, spending on Phase 1 authorised</a> (see also <a href="/web/20210415190955/http://www.eso.org/sci/publications/messenger/archive/no.158-dec14/messenger-no158-3-6.pdf">Messenger article</a>); a new policy for the awarding of GTO time on the ELT was approved by Council (<a href="https://web.archive.org/web/20210415190955/https://www.eso.org/public/about-eso/committees/cou/cou-133rd/external/Cou_1543_Public_EELT_GTO_Policy_051214.pdf">see the Policy Document</a>)</li> <li>[19 Jun 2014] <a href="/web/20210415190955/http://www.eso.org/public/news/eso1419/">Groundbreaking for the ELT</a></li> <li>[01 Oct 2013] Announcement of the ELT conference <a href="/web/20210415190955/http://www.eso.org/exoelt2014/">Exoplanet Observations with the ELT</a>, 03 – 06 February 2014</li> <li>[04 Dec 2012] <a href="/web/20210415190955/http://www.eso.org/public/announcements/ann12096/">Full approval of the ELT Programme</a></li> <li>[11 Jun 2012] <a href="/web/20210415190955/http://www.eso.org/public/news/eso1225/">ELT Programme approved</a> (pending confirmation)</li> <li>[04 Jun 2012] <a href="science/pst/members.html">ELT Project Science Team</a> appointed</li> <li>[30 Jan 2012] Call for Nominations for the <a href="science/pst/call.html">ELT Project Science Team</a>, deadline: 31 March 2012</li> <li>[15 Jan 2012] Announcement of the ELT Workshop <a href="/web/20210415190955/http://www.eso.org/sci/meetings/2013/eelt2013.html">"Shaping ELT Science and Instrumentation"</a>, 25 February – 01 March 2013</li> <li>[09 Dec 2011] Publication of the <a href="docs/e-elt_constrproposal.pdf">ELT Construction Proposal</a> and of its <a href="docs/e-elt_executivesummary.pdf">Executive Summary</a> (<a href="/web/20210415190955/http://www.eso.org/public/news/eso1150/">more</a>) </li> </td> </tr> </table>  </ul> </p> </div>   <div id="ie_clearing"> </div> </div>    <div id="footer">  <div id="footerupdate"> <table><tr><th>Last Update: 05.02.19 © ESO </th> <td> <a href="/web/20210415190955/http://www.eso.org/public/contactform.html?area=science">Send us your comments!</a> | <a href="/web/20210415190955/http://www.eso.org/sci/enews/">Subscribe to Newsletter</a> | <a href="/web/20210415190955/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/20210415190955/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>