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From their locations on mountains in Hawai鈥榠 and Chile, Gemini Observatory鈥檚 telescopes can collectively access the entire sky." /> <link rel="canonical" href="https://www.gemini.edu/about/gemini-telescopes-science-and-technologies" /> <meta property="og:site_name" content="Gemini Observatory" /> <meta property="og:url" content="https://www.gemini.eduhttps://www.gemini.edu/about/gemini-telescopes-science-and-technologies" /> <meta property="og:type" content="article" /> <meta property="og:title" content="Gemini Telescopes, Science and Technologies" /> <meta property="og:description" content="The Gemini Observatory consists of twin 8.1-meter diameter optical/infrared telescopes located on two of the best observing sites on the planet. From their locations on mountains in Hawai鈥榠 and Chile, Gemini Observatory鈥檚 telescopes can collectively access the entire sky." /> <meta property="og:updated_time" content="2021-07-15T08:24:41-10:00" /> <meta name="twitter:card" content="summary" /> <meta name="twitter:creator" content="@geminiobs" /> <meta name="twitter:url" content="https://www.gemini.eduhttps://www.gemini.edu/about/gemini-telescopes-science-and-technologies" /> <meta name="twitter:title" content="Gemini Telescopes, Science and Technologies" /> <meta name="twitter:description" content="The Gemini Observatory consists of twin 8.1-meter diameter optical/infrared telescopes located on two of the best observing sites on the planet. From their locations on mountains in Hawai鈥榠 and Chile, Gemini Observatory鈥檚 telescopes can collectively access the entire sky." /> <meta property="article:author" content="thayward" /> <meta property="article:published_time" content="2016-07-29T09:08:49-10:00" /> <meta property="article:modified_time" content="2021-07-15T08:24:41-10:00" /> <title>Gemini Telescopes, Science and Technologies | Gemini Observatory</title> <style> @import url("https://www.gemini.edu/modules/system/system.base.css?srlexa"); @import url("https://www.gemini.edu/modules/system/system.messages.css?srlexa"); @import url("https://www.gemini.edu/modules/system/system.theme.css?srlexa"); </style> <style> @import url("https://www.gemini.edu/sites/all/modules/contrib/date/date_api/date.css?srlexa"); @import url("https://www.gemini.edu/sites/all/modules/contrib/date/date_popup/themes/datepicker.1.7.css?srlexa"); @import url("https://www.gemini.edu/sites/all/modules/contrib/fences/field.css?srlexa"); @import 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view-mode-full "> <div class=" row"> <div class="group-left medium-3 columns"> <section class="block block-menu-block gemini-block block-menu-block-3 gemini-block"> <h2 class="block-title"><a href="/about" class="active-trail">About</a></h2> <div class="menu-block-wrapper menu-block-3 menu-name-menu-menu parent-mlid-0 menu-level-2"> <ul class="menu menu-menu level-2"><li class="first leaf menu-mlid-15102" id="zconduct"><a href="https://noirlab.edu/public/conduct/" title="">Conduct</a></li> <li class="leaf menu-mlid-14891" id="zcareersandjobs"><a href="/about/careers-and-jobs">Careers and Jobs</a></li> <li class="leaf menu-mlid-14699" id="zpublications"><a href="https://www.gemini.edu/science/publications/" title="">Publications</a></li> <li class="leaf active-trail active menu-mlid-14640" id="zgeminitelescopesscienceandtechnologies"><a href="/about/gemini-telescopes-science-and-technologies" class="active-trail active">Gemini Telescopes, Science and Technologies</a></li> <li class="collapsed menu-mlid-14877" id="zgeminiintheeraofmultimessengerastronomy"><a href="/about/gemini-era-multi-messenger-astronomy">Gemini In The Era of Multi-Messenger Astronomy</a></li> <li class="leaf menu-mlid-15317" id="znationalgeminiofficesngo"><a href="/about/national-gemini-offices-ngo">National Gemini Offices (NGO)</a></li> <li class="leaf menu-mlid-15145" id="zgovernance"><a href="/about/governance">Governance</a></li> <li class="leaf menu-mlid-14786" id="zparticipantshares"><a href="/about/participant-shares">Participant Shares</a></li> <li class="leaf menu-mlid-14639" id="zwebaccessibility"><a href="/about/web-accessibility">Web Accessibility</a></li> <li class="leaf menu-mlid-15316" id="zcontactus"><a href="/contact">Contact Us</a></li> <li class="leaf menu-mlid-14791" id="zgeminicontactscientists"><a href="/about/contact-us/gemini-contact-scientists">Gemini Contact Scientists</a></li> <li class="leaf menu-mlid-15238" id="zgeministrategicplanning"><a href="/about/gemini-strategic-planning">Gemini Strategic Planning</a></li> <li class="last leaf menu-mlid-14792" id="zgeminiresearchstaff"><a href="/about/contact-us/gemini-research-staff">Gemini Research Staff</a></li> </ul></div> </section> </div> <div class="group-right medium-9 columns"> <div class="span-45 prepend-3" style="margin-top: 20px"> <p>The Gemini Observatory consists of twin 8.1-meter diameter optical/infrared telescopes located on two of the best observing sites on the planet. From their locations on mountains in Hawai‘i and Chile, Gemini Observatory’s telescopes can collectively access the entire sky.</p> <p>The Gemini South telescope is located at an elevation of 2,737 meters (8,980 feet) on a mountain in the Chilean Andes named Cerro Pachón. Cerro Pachón shares resources with the adjacent SOAR Telescope and the nearby telescopes of the Cerro Tololo Inter-American Observatory. It is expected that the Large Synoptic Survey Telescope (LSST) will join Gemini on Cerro Pachón during the second half of this decade.</p> <p>The Frederick C. Gillett Gemini North telescope is located on Hawaii's Mauna Kea as part of the international community of observatories built to take advantage of the superb atmospheric conditions on this long dormant volcano which rises about 4,214 meters (13,824 feet) into the dry, stable air of the Pacific. The Gemini Observatory's international headquarters is located in Hilo,Hawai‘i at the University of Hawaii Hilo's University Park.</p> <p>Both of the Gemini telescopes have been designed to excel in a wide variety of optical and infrared <a href="https://www.gemini.edu/sciops/instruments/Gemini_Capabilities_Brochure.pdf">capabilities</a>. By incorporating technologies such as laser guide star adaptive optics and multi-object spectroscopy, astronomers in the Gemini partnership explore the universe in unprecedented depth and detail.</p> <p>Gemini is operated by an international partnership that includes the <a href="/partners#US">United States</a>, <a href="/partners#Canada">Canada</a>, <a href="/partners#Brazil">Brazil</a>, <a href="/partners#Argentina">Argentina</a> and <a href="/partners#Chile">Chile</a>. Any astronomer in each participating country can apply for time on Gemini which is allocated in accordance with the amount of financial support provided by each country. The Gemini telescopes have been integrated with the latest networking technologies to allow remote operations from control rooms at the base facilities in Hilo, Hawai‘i and La Serena, Chile. With the flexibility of "Queue Scheduling" and remote participation, researchers anywhere in the Gemini partnership will be assured the best possible match between observation, instrument and observing conditions.</p> </div>  <div class="span-45 prepend-3" style="margin-top: 20px"><img border="1" height="153" src="http://www.gemini.edu/images/stories/news/about/InsidePV_btn.jpg" /> <img border="1" height="153" src="http://www.gemini.edu/images/stories/news/about/GSTrails2_btn.jpg" /> <p style="font-size:11px;color:gray;margin-top:5px;margin-bottom:20px;">(Left) Gemini North with open wind vents and observing slit at sunset. (Right) Gemini South with star-trails of the South Celestial Pole overhead.</p> </div> <div class="span-45 prepend-3" style="margin-top: 10px"> <h3>Gemini Observatory – Facts and Figures</h3> <p><b>Primary Mirror:</b></p> <ul> <li>Diameter: 8.1 meters/26.58 feet/319 inches<br /> Mass: 22.22 metric tonnes/24.5 U.S. tons<br /> Composition: Corning Ultra-Low Expansion (ULE) Glass<br /> Surface Accuracy: 15.6 nm RMS (Between 1/1000 – 1/10,000 thickness of human hair)</li> <br /> <br />   </ul> <p><b>Telescope Structure:</b></p> <ul> <li>Height: 21.7 meters/71.2 feet/7 stories (from “Observing Floor”)<br /> Weight: 380 metric tonnes/418 U.S. tons<br /> Optomechanical Design: Alt-azimuth/Cassegrain</li> <br /> <br />   </ul> <p><b>Dome:</b></p> <ul> <li>Height: 46 meters/151 feet/15 stories (from ground)<br /> Weight: 780 metric tonnes/858 U.S. tons (moving mass)<br /> Rotation: 360 degrees in 2 minutes<br /> Thermal Vents: 10 meters/32.8 feet (width – fully open)</li> <br /> <br />   </ul> <p><b>First Light:</b></p> <ul> <li>Gemini North: 1999<br /> Gemini South: 2000</li> <br /> <br />   </ul> <p><b>Other Data:</b></p> <ul> <li>Elevation: <ul> <li>Gemini North: 4,214 meters/13,824 feet<br /> Gemini South: 2,737 meters/8,980 feet</li> <br /> <br />   </ul> Location: <ul> <li>Gemini North: 19º49.4’N/155º28.1’W<br /> Gemini South: 30º14.5’S/70º44.8’W</li> </ul> </li> </ul> <p></p> </div> </div> </div> </div> </main> <footer> <div class="footer-primary"> <div class="row medium-collapse"> <div class="small-12 medium-5 large-3 footer-left columns"> <section class="block block-boxes block-boxes-simple block-boxes-participant-footer "> <div id='boxes-box-participant_footer' class='boxes-box'><div class="boxes-box-content"><section class="footer-participants"> <h3>International Gemini Observatory</h3> <p>The International Gemini Observatory  provides the astronomical communities in six participant countries with state-of-the-art astronomical facilities that allocate observing time in proportion to each country's contribution. In addition to financial support, each country also contributes significant scientific and technical resources. The national research agencies that form the Gemini partnership include: the US National Science Foundation (NSF), the Canadian National Research Council (NRC), the Chilean Agencia Nacional de Investigaci贸n y Desarrollo (ANID), the Brazilian Minist茅rio da Ci锚ncia, Tecnologia e Inova莽茫o, the Argentinean Ministerio de Ciencia, Tecnolog铆a e Innovaci贸n, and the Korea Astronomy and Space Institute (KASI). The observatory is managed by the Association of Universities for Research in Astronomy, Inc. (AURA) under a cooperative agreement with the NSF. 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