A guiding star

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<div class="level1"> <ul id="submenu-aim-113" class="submenu-aim"> <li class=""><a href="/web/20200815115607/https://eso.org/public/videos/search/"> Advanced Search </a></li><li class="submenu"><a class="no-link children" href="#"> Categories <span class="desktop-children topmenu-arrow fa fa-angle-right"></span></a><span class="mobile-children"><span class="fa fa-angle-down"></span></span><ul id="submenu-aim-115" class="submenu-aim sublevel"><li class=""><a href="/web/20200815115607/https://eso.org/public/videos/archive/category/abouteso/"> About ESO </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/videos/archive/category/alma/"> ALMA </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/videos/archive/category/apex/"> APEX </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/videos/archive/category/compilations/"> Compilations </a></li><li class=""><a 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href="/web/20200815115607/https://eso.org/public/teles-instr/paranal-observatory/vlt/"> Very Large Telescope <span class="desktop-children topmenu-arrow fa fa-angle-right"></span></a><span class="mobile-children"><span class="fa fa-angle-down"></span></span><ul id="submenu-aim-243" class="submenu-aim sublevel"><li class="submenu"><a href="/web/20200815115607/https://eso.org/public/teles-instr/paranal-observatory/vlt/vlt-instr/"> VLT Instruments <span class="desktop-children topmenu-arrow fa fa-angle-right"></span></a><span class="mobile-children"><span class="fa fa-angle-down"></span></span><ul id="submenu-aim-244" class="submenu-aim sublevel"><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/paranal-observatory/vlt/vlt-instr/4lgsf/"> 4LGSF </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/paranal-observatory/vlt/vlt-instr/amber/"> AMBER </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/paranal-observatory/vlt/vlt-instr/crires/"> CRIRES </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/paranal-observatory/vlt/vlt-instr/espresso/"> ESPRESSO </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/paranal-observatory/vlt/vlt-instr/eris/"> ERIS </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/paranal-observatory/vlt/vlt-instr/flames/"> FLAMES </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/paranal-observatory/vlt/vlt-instr/fors/"> FORS1 and FORS2 </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/paranal-observatory/vlt/vlt-instr/gravity/"> GRAVITY </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/paranal-observatory/vlt/vlt-instr/hawk-i/"> HAWK-I </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/paranal-observatory/vlt/vlt-instr/isaac/"> ISAAC </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/paranal-observatory/vlt/vlt-instr/kmos/"> KMOS </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/paranal-observatory/vlt/vlt-instr/mad/"> MAD </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/paranal-observatory/vlt/vlt-instr/matisse/"> MATISSE </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/paranal-observatory/vlt/vlt-instr/midi/"> MIDI </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/paranal-observatory/vlt/vlt-instr/moons/"> MOONS </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/paranal-observatory/vlt/vlt-instr/muse/"> MUSE </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/paranal-observatory/vlt/vlt-instr/naco/"> NACO </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/paranal-observatory/vlt/vlt-instr/naomi/"> NAOMI </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/paranal-observatory/vlt/vlt-instr/pionier/"> PIONIER </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/paranal-observatory/vlt/vlt-instr/sinfoni/"> SINFONI </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/paranal-observatory/vlt/vlt-instr/sphere/"> SPHERE </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/paranal-observatory/vlt/vlt-instr/uves/"> UVES </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/paranal-observatory/vlt/vlt-instr/vimos/"> VIMOS </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/paranal-observatory/vlt/vlt-instr/visir/"> VISIR </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/paranal-observatory/vlt/vlt-instr/x-shooter/"> X-shooter </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/paranal-observatory/vlt/vlt-instr/vtl-test-cameras/"> VLT Test Cameras </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/paranal-observatory/vlt/vlt-instr/vinci/"> VINCI </a></li></ul></li><li class="submenu"><a href="/web/20200815115607/https://eso.org/public/teles-instr/paranal-observatory/vlt/vlt-names/"> VLT Unit Telescopes Names <span class="desktop-children topmenu-arrow fa fa-angle-right"></span></a><span class="mobile-children"><span class="fa fa-angle-down"></span></span><ul id="submenu-aim-272" class="submenu-aim sublevel"><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/paranal-observatory/vlt/vlt-names/antu/"> Antu </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/paranal-observatory/vlt/vlt-names/kueyen/"> Kueyen </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/paranal-observatory/vlt/vlt-names/melipal/"> Melipal </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/paranal-observatory/vlt/vlt-names/yepun/"> Yepun </a></li></ul></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/paranal-observatory/vlt/auxiliarytelescopes/"> Auxiliary Telescopes </a></li></ul></li><li class="submenu"><a href="/web/20200815115607/https://eso.org/public/teles-instr/paranal-observatory/surveytelescopes/"> Survey Telescopes <span class="desktop-children topmenu-arrow fa fa-angle-right"></span></a><span class="mobile-children"><span class="fa fa-angle-down"></span></span><ul 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href="/web/20200815115607/https://eso.org/public/teles-instr/paranal-observatory/speculoos/"> SPECULOOS </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/paranal-observatory/ngts/"> NGTS </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/paranal-observatory/cta/"> Cherenkov Telescope Array </a></li></ul></li><li class="submenu"><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/"> La Silla Observatory <span class="desktop-children topmenu-arrow fa fa-angle-right"></span></a><span class="mobile-children"><span class="fa fa-angle-down"></span></span><ul id="submenu-aim-292" class="submenu-aim sublevel"><li class="submenu"><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/swedish/"> Swedish–ESO Submillimetre Telescope <span class="desktop-children topmenu-arrow fa fa-angle-right"></span></a><span class="mobile-children"><span class="fa fa-angle-down"></span></span><ul id="submenu-aim-293" class="submenu-aim sublevel"><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/swedish/simba/"> SIMBA </a></li></ul></li><li class="submenu"><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/ntt/"> New Technology Telescope <span class="desktop-children topmenu-arrow fa fa-angle-right"></span></a><span class="mobile-children"><span class="fa fa-angle-down"></span></span><ul id="submenu-aim-295" class="submenu-aim sublevel"><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/ntt/efosc2/"> EFOSC2 </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/ntt/emmi/"> EMMI </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/ntt/irspec/"> IRSPEC </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/ntt/sofi/"> SOFI </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/ntt/soxs/"> SOXS </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/ntt/susi2/"> SUSI and SUSI2 </a></li></ul></li><li class="submenu"><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/36/"> ESO 3.6-metre telescope <span class="desktop-children topmenu-arrow fa fa-angle-right"></span></a><span class="mobile-children"><span class="fa fa-angle-down"></span></span><ul id="submenu-aim-302" class="submenu-aim sublevel"><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/36/adonis/"> ADONIS </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/36/caspec/"> CASPEC </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/36/irspec/"> IRSPEC </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/36/harps/"> HARPS </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/36/mefos/"> MEFOS </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/36/nirps/"> NIRPS </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/36/optopus/"> OPTOPUS </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/36/timmi2/"> TIMMI/2 </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/36/36-infrared-photometer-spectrophotometer/"> Infrared Photometer/Spectrophotometer </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/36/36-standard-photometer/"> Standard Photometer </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/36/infrared-specklegraph/"> Infrared Specklegraph </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/36/infrared-speckle-interferometer/"> Infrared Speckle Interferometer </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/36/efosc/"> EFOSC </a></li></ul></li><li class="submenu"><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/mpg22/"> MPG/ESO 2.2-metre telescope <span class="desktop-children topmenu-arrow fa fa-angle-right"></span></a><span class="mobile-children"><span class="fa fa-angle-down"></span></span><ul id="submenu-aim-316" class="submenu-aim sublevel"><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/mpg22/feros/"> FEROS </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/mpg22/grond/"> GROND </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/mpg22/irac2/"> IRAC & IRAC2 </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/mpg22/pisco/"> PISCO </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/mpg22/wfi/"> WFI </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/mpg22/infrared-photometer-spectrophotometer/"> Infrared Photometer/Spectrophotometer </a></li></ul></li><li class="submenu"><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/swiss/"> Swiss 1.2-metre Leonhard Euler Telescope <span class="desktop-children topmenu-arrow fa fa-angle-right"></span></a><span class="mobile-children"><span class="fa fa-angle-down"></span></span><ul id="submenu-aim-323" class="submenu-aim sublevel"><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/swiss/coralie/"> CORALIE </a></li></ul></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/rem/"> Rapid Eye Mount telescope </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/trappist/"> TRAnsiting Planets and PlanetesImals Small Telescope–South </a></li><li class="submenu"><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/danish154/"> Danish 1.54-metre telescope <span class="desktop-children topmenu-arrow fa fa-angle-right"></span></a><span class="mobile-children"><span class="fa fa-angle-down"></span></span><ul id="submenu-aim-327" class="submenu-aim sublevel"><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/danish154/coravel/"> CORAVEL </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/danish154/dfosc/"> DFOSC </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/danish154/ccd/"> CCD camera </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/danish154/hb-photometer/"> Hβ Photometer </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/danish154/two-channel-photometer/"> Two-Channel Photometer </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/danish154/four-channel-photometer/"> Four-Channel Photometer </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/danish154/six-channel-photometer/"> Six-Channel uvby-Hβ Photometer </a></li></ul></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/tarot/"> Télescope à Action Rapide pour les Objets Transitoires </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/1mschmidt/"> ESO 1-metre Schmidt telescope </a></li><li class="submenu"><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/152metre/"> ESO 1.52-metre telescope <span class="desktop-children topmenu-arrow fa fa-angle-right"></span></a><span class="mobile-children"><span class="fa fa-angle-down"></span></span><ul id="submenu-aim-337" class="submenu-aim sublevel"><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/152metre/bandc/"> Boller and Chivens Spectrograph </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/152metre/coude/"> Coudé Spectrograph </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/152metre/echelec/"> ECHELEC </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/152metre/rv-cass-spectrograph/"> RV Cass Spectrograph </a></li></ul></li><li class="submenu"><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/1metre/"> ESO 1-metre telescope <span class="desktop-children topmenu-arrow fa fa-angle-right"></span></a><span class="mobile-children"><span class="fa fa-angle-down"></span></span><ul id="submenu-aim-342" class="submenu-aim sublevel"><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/1metre/fideos/"> FIDEOS </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/1metre/infrared-photometer/"> Infrared Photometer </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/1metre/single-channel-photometer/"> Single-Channel Photometer </a></li></ul></li><li class="submenu"><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/05metre/"> ESO 0.5-metre telescope <span class="desktop-children topmenu-arrow fa fa-angle-right"></span></a><span class="mobile-children"><span class="fa fa-angle-down"></span></span><ul id="submenu-aim-346" class="submenu-aim sublevel"><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/05metre/single-channel-photometer/"> Single-Channel Photometer </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/05metre/double-channel-photometer/"> Double-Channel Photometer </a></li></ul></li><li class="submenu"><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/coude/"> Coudé Auxiliary Telescope <span class="desktop-children topmenu-arrow fa fa-angle-right"></span></a><span class="mobile-children"><span class="fa fa-angle-down"></span></span><ul id="submenu-aim-349" class="submenu-aim sublevel"><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/coude/ces/"> CES </a></li></ul></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/marly/"> MarLy 1-metre telescope </a></li><li class="submenu"><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/09metre/"> Dutch 0.9-metre telescope <span class="desktop-children topmenu-arrow fa fa-angle-right"></span></a><span class="mobile-children"><span class="fa fa-angle-down"></span></span><ul id="submenu-aim-352" class="submenu-aim sublevel"><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/09metre/walraven/"> Walraven Photometer </a></li></ul></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/t70/"> Swiss T70 telescope </a></li><li class="submenu"><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/bochum/"> Bochum 0.61-metre telescope <span class="desktop-children topmenu-arrow fa fa-angle-right"></span></a><span class="mobile-children"><span class="fa fa-angle-down"></span></span><ul id="submenu-aim-355" class="submenu-aim sublevel"><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/bochum/bochum-scanner/"> Bochum Scanner </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/bochum/bochum-photometer/"> Bochum Photometer </a></li></ul></li><li class="submenu"><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/danish05/"> Danish 0.5-metre telescope <span class="desktop-children topmenu-arrow fa fa-angle-right"></span></a><span class="mobile-children"><span class="fa fa-angle-down"></span></span><ul id="submenu-aim-358" class="submenu-aim sublevel"><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/danish05/danish-two-channel-hb-photometer/"> Two-Channel Hβ Photometer </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/danish05/danish-four-channel-uvby-photometer/"> Four-Channel uvby Photometer </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/danish05/danish-six-channel-uvby-hb-photometer/"> Six-Channel uvby–Hβ Photometer </a></li></ul></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/gpo/"> Grand Prisme Objectif telescope </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/swiss04/"> Swiss 0.4-metre telescope </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/marseille/"> Marseille 0.36-metre telescope </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/grb/"> GRB Monitoring System </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/mascara/"> MASCARA </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/blackgem/"> BlackGEM </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/extra/"> ExTrA </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/lasilla/test-bed/"> Test-Bed Telescope </a></li></ul></li><li class="submenu"><a href="/web/20200815115607/https://eso.org/public/teles-instr/apex/"> APEX <span class="desktop-children topmenu-arrow fa fa-angle-right"></span></a><span class="mobile-children"><span class="fa fa-angle-down"></span></span><ul id="submenu-aim-370" class="submenu-aim sublevel"><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/apex/artemis/"> ArTéMiS </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/apex/laboca/"> LABOCA </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/apex/saboca/"> SABOCA </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/apex/sepia/"> SEPIA </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/apex/apex-2a/"> APEX–2A </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/apex/aszca/"> ASZCa </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/apex/champ-plus/"> CHAMP+ </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/apex/flash/"> FLASH </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/apex/flash-plus/"> FLASH+ </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/apex/mpi_11thz/"> MPI_1.1THz </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/apex/p-artemis/"> P-ArTéMiS </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/apex/pi230/"> PI230 </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/apex/polka/"> PolKa </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/apex/shefi/"> SHeFI </a></li></ul></li><li class="submenu"><a href="/web/20200815115607/https://eso.org/public/teles-instr/alma/"> ALMA <span class="desktop-children topmenu-arrow fa fa-angle-right"></span></a><span class="mobile-children"><span class="fa fa-angle-down"></span></span><ul id="submenu-aim-385" class="submenu-aim sublevel"><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/alma/antennas/"> Antennas </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/alma/transporters/"> Transporters </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/alma/interferometry/"> Interferometry </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/alma/receiver-bands/"> Receiver Bands </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/alma/residencia/"> ALMA Residencia </a></li></ul></li><li class="submenu"><a href="/web/20200815115607/https://eso.org/public/teles-instr/elt/"> ELT <span class="desktop-children topmenu-arrow fa fa-angle-right"></span></a><span class="mobile-children"><span class="fa fa-angle-down"></span></span><ul id="submenu-aim-391" class="submenu-aim sublevel"><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/elt/telescope/"> ELT Telescope </a></li><li class="submenu"><a href="/web/20200815115607/https://eso.org/public/teles-instr/elt/instruments/"> ELT Instruments <span class="desktop-children topmenu-arrow fa fa-angle-right"></span></a><span class="mobile-children"><span class="fa fa-angle-down"></span></span><ul id="submenu-aim-393" class="submenu-aim sublevel"><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/elt/elt-instr/harmoni/"> HARMONI </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/elt/elt-instr/hires/"> HIRES (Phase A completed) </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/elt/elt-instr/maory/"> MAORY </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/elt/elt-instr/metis/"> METIS </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/elt/elt-instr/micado/"> MICADO </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/elt/elt-instr/mosaic/"> MOSAIC (Phase A completed) </a></li></ul></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/elt/science/"> ELT Science </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/elt/numbers/"> ELT in numbers </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/elt/cerro-armazones/"> Cerro Armazones </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/elt/companies/"> Contractors working for the ELT </a></li></ul></li><li class="submenu"><a href="/web/20200815115607/https://eso.org/public/teles-instr/technology/"> Technology for Telescopes <span class="desktop-children topmenu-arrow fa fa-angle-right"></span></a><span class="mobile-children"><span class="fa fa-angle-down"></span></span><ul id="submenu-aim-404" class="submenu-aim sublevel"><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/technology/active_optics/"> Active Optics </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/technology/adaptive_optics/"> Adaptive Optics </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/technology/ifu/"> Integral Field Units </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/technology/interferometry/"> Interferometry </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/technology/spectroscopy/"> Spectroscopy </a></li></ul></li><li class=""><a href="/web/20200815115607/https://eso.org/public/teles-instr/instruments/"> Instruments </a></li> </ul> </div> </div> </li> <li><a href="/web/20200815115607/https://eso.org/public/science/">Discoveries<span class="fa fa-angle-down level0-children-arrows"></span></a> <span class="mobile-children"> <span class="fa fa-angle-down"></span> </span> <div class="level1-wrapper"> <div class="level1"> <ul id="submenu-aim-411" class="submenu-aim"> <li class=""><a href="/web/20200815115607/https://eso.org/public/science/top10/"> ESO Top 10 Astronomical Discoveries </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/science/exoplanets/"> Exoplanets </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/science/gravitationalwaves/"> Gravitational Wave Sources </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/science/gc/"> Black Hole at the Centre of our Galaxy </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/science/grb/"> Gamma-Ray Bursts </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/science/archive/"> Science Archive </a></li> </ul> </div> </div> </li> <li><a href="/web/20200815115607/https://eso.org/public/events/">Events<span class="fa fa-angle-down level0-children-arrows"></span></a> <span class="mobile-children"> <span class="fa fa-angle-down"></span> </span> <div class="level1-wrapper"> <div class="level1"> <ul id="submenu-aim-418" class="submenu-aim"> <li class=""><a href="/web/20200815115607/https://eso.org/public/events/press-evt/"> Press Events </a></li><li class="submenu"><a href="/web/20200815115607/https://eso.org/public/events/special-evt/"> Special Events <span class="desktop-children topmenu-arrow fa fa-angle-right"></span></a><span class="mobile-children"><span class="fa fa-angle-down"></span></span><ul id="submenu-aim-420" class="submenu-aim sublevel"><li class=""><a href="/web/20200815115607/https://eso.org/public/announcements/ann18065/"> Open House Day 2018 </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/events/special-evt/asteroid-day/"> Asteroid Day </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/events/special-evt/openhouse17/"> Open House Day 2017 </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/announcements/ann16071/"> Open House Day 2016 </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/events/special-evt/MeetESO/"> #MeetESO </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/events/special-evt/openhouse15/"> Long Night of Science 2015 </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/events/special-evt/astronet2014/"> ASTRONET 2014 </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/events/special-evt/openhouse14/"> Open House Day 2014 </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/events/special-evt/eeltblast/"> ELT Groundbreaking </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/events/special-evt/cafe-and-kosmos/"> Café & Kosmos in Munich </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/events/special-evt/openhouse13/"> Open House Day 2013 </a></li><li class="submenu"><a href="/web/20200815115607/https://eso.org/public/events/special-evt/astronet2013/"> ASTRONET 2013 <span class="desktop-children topmenu-arrow fa fa-angle-right"></span></a><span class="mobile-children"><span class="fa fa-angle-down"></span></span><ul id="submenu-aim-432" class="submenu-aim sublevel"><li class=""><a href="/web/20200815115607/https://eso.org/public/events/special-evt/astronet2013/dates/"> Important Dates </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/events/special-evt/astronet2013/registration/"> Registration, Fees and Payment </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/events/special-evt/astronet2013/abstracts/"> Abstract Submission </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/events/special-evt/astronet2013/venue/"> Workshop Venue </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/events/special-evt/astronet2013/practical_information/"> Practical Information </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/events/special-evt/astronet2013/accommodation/"> Accommodation </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/events/special-evt/astronet2013/organisers_partners/"> Organisers & Partners </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/events/special-evt/astronet2013/contact/"> Contact </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/events/special-evt/astronet2013/schedule/"> Schedule </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/events/special-evt/astronet2013/participants/"> Participants </a></li></ul></li><li class="submenu"><a href="/web/20200815115607/https://eso.org/public/events/special-evt/50years/"> ESO 50 Years <span class="desktop-children topmenu-arrow fa fa-angle-right"></span></a><span class="mobile-children"><span class="fa fa-angle-down"></span></span><ul id="submenu-aim-443" class="submenu-aim sublevel"><li class=""><a href="/web/20200815115607/https://eso.org/public/events/special-evt/50years/message/"> Message from the DG </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/events/special-evt/50years/50highlights50years/"> Fifty Highlights </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/events/special-evt/50years/competitions/"> Competitions </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/events/special-evt/50years/twitter/"> Twitter Feed </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/events/special-evt/50years/webcast/"> Webcast </a></li><li class="submenu"><a href="/web/20200815115607/https://eso.org/public/events/special-evt/50years/europetothestars/"> Europe to the Stars <span class="desktop-children topmenu-arrow fa fa-angle-right"></span></a><span class="mobile-children"><span class="fa fa-angle-down"></span></span><ul id="submenu-aim-449" class="submenu-aim sublevel"><li class=""><a href="/web/20200815115607/https://eso.org/public/events/special-evt/50years/europetothestars/news/"> News </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/events/special-evt/50years/europetothestars/movie/"> Movie </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/events/special-evt/50years/europetothestars/book/"> Book </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/events/special-evt/50years/europetothestars/reviews/"> Reviews </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/events/special-evt/50years/europetothestars/bios/"> Bios </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/events/special-evt/50years/europetothestars/offers/"> Purchase Offers </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/events/special-evt/50years/europetothestars/press/"> For the Press </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/events/special-evt/50years/europetothestars/contact/"> Contact Us </a></li></ul></li></ul></li><li class=""><a href="/web/20200815115607/https://eso.org/public/events/special-evt/50years-in-chile/"> 50 years of ESO in Chile </a></li><li class="submenu"><a href="/web/20200815115607/https://eso.org/public/events/special-evt/awesome-universe/"> Awesome Universe <span class="desktop-children topmenu-arrow fa fa-angle-right"></span></a><span class="mobile-children"><span class="fa fa-angle-down"></span></span><ul id="submenu-aim-459" class="submenu-aim sublevel"><li class=""><a href="/web/20200815115607/https://eso.org/public/events/special-evt/awesome-universe/venues/"> List of venues </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/events/special-evt/awesome-universe/organisers/"> For Exhibitors </a></li></ul></li><li class=""><a href="/web/20200815115607/https://eso.org/public/events/special-evt/iya2009/"> IYA 2009 </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/events/special-evt/100ha/"> 100 Hours of Astronomy </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/events/special-evt/theeye/"> The Eye 3D </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/events/special-evt/imax-hidden-universe/"> IMAX® 3D Film Hidden Universe </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/events/special-evt/openhouse11/"> Open House Day 2011 </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/events/special-evt/openhouse09/"> Open House Day 2009 (German) </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/outreach/bond/"> Bond at Paranal </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/events/special-evt/lndw-2007eng/"> Long Night of Science 2007 </a></li><li class="submenu"><a href="/web/20200815115607/https://eso.org/public/events/special-evt/openhouse/"> Open House Day 2006 <span class="desktop-children topmenu-arrow fa fa-angle-right"></span></a><span class="mobile-children"><span class="fa fa-angle-down"></span></span><ul id="submenu-aim-470" class="submenu-aim sublevel"><li class=""><a href="/web/20200815115607/https://eso.org/public/events/special-evt/openhouse/ohd06-winnerslist/"> List of Prize Winners </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/events/special-evt/openhouse/tdot06/"> Deutsche Fassung </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/events/special-evt/openhouse/tdot06-gewinnerliste/"> Liste der Preisgewinner </a></li></ul></li><li class=""><a href="/web/20200815115607/https://eso.org/public/events/special-evt/pt-011203/"> Public Talks 2003 </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/events/special-evt/eso40years/"> ESO 40 Years (1962 - 2002) </a></li></ul></li><li class="submenu"><a href="/web/20200815115607/https://eso.org/public/events/exhibitions/"> Exhibitions <span class="desktop-children topmenu-arrow fa fa-angle-right"></span></a><span class="mobile-children"><span class="fa fa-angle-down"></span></span><ul id="submenu-aim-476" class="submenu-aim sublevel"><li class=""><a href="/web/20200815115607/https://eso.org/public/events/exhibitions/perma_exhibitions/"> ESO Permanent Exhibitions </a></li><li class=""><a href="https://web.archive.org/web/20200815115607/http://www.esof.eu/"> EuroScience Open Forum (ESOF) </a></li><li class=""><a href="https://web.archive.org/web/20200815115607/http://eas.unige.ch/EWASS2016/"> EWASS 2016 </a></li><li class=""><a href="https://web.archive.org/web/20200815115607/https://aas.org/meetings/aas227"> AAS Winter 2016 </a></li></ul></li><li class="submenu"><a href="/web/20200815115607/https://eso.org/public/events/astro-evt/"> Astronomical Events <span class="desktop-children topmenu-arrow fa fa-angle-right"></span></a><span class="mobile-children"><span class="fa fa-angle-down"></span></span><ul id="submenu-aim-481" class="submenu-aim sublevel"><li class=""><a href="/web/20200815115607/https://eso.org/public/events/astro-evt/solareclipse2019/"> Total Solar Eclipse 2019 </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/events/astro-evt/mcnaught2007/"> The Comet McNaught 2007 </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/events/astro-evt/deepimpact/"> Deep Impact - 04.07.2005 </a></li><li class=""><a href="https://web.archive.org/web/20200815115607/http://www.vt-2004.org/"> The Venus Transit - 08.11.2004 </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/events/astro-evt/leonids99/"> The Leonids - 17.11.1999 </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/events/astro-evt/eclipse99/"> Solar Eclipse at ESO HQ - 11.08.1999 </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/events/astro-evt/leonids98/"> The Leonids - 11.1998 </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/events/astro-evt/pathfinder/"> Mars Pathfinder - 1997 </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/events/astro-evt/hyakutake/"> Comet Hyakutake - 1997 </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/events/astro-evt/sl9/"> SL-9 and Jupiter - 1994 </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/events/astro-evt/hale-bopp/"> Comet Hale Bopp - 1994 </a></li></ul></li><li class=""><a href="/web/20200815115607/https://eso.org/public/events/seminars/"> Astronomy Communication Seminars </a></li> </ul> </div> </div> </li> <li><a href="/web/20200815115607/https://eso.org/public/outreach/">Outreach<span class="fa fa-angle-down level0-children-arrows"></span></a> <span class="mobile-children"> <span class="fa fa-angle-down"></span> </span> <div class="level1-wrapper"> <div class="level1"> <ul id="submenu-aim-494" class="submenu-aim"> <li class="submenu"><a href="/web/20200815115607/https://eso.org/public/outreach/eduoff/"> Education <span class="desktop-children topmenu-arrow fa fa-angle-right"></span></a><span class="mobile-children"><span class="fa fa-angle-down"></span></span><ul id="submenu-aim-495" class="submenu-aim sublevel"><li class=""><a href="/web/20200815115607/https://eso.org/public/products/education/"> Educational Material </a></li><li class=""><a href="https://web.archive.org/web/20200815115607/http://www.scienceinschool.org/" target="_blank"> Science in School </a></li><li class=""><a href="https://web.archive.org/web/20200815115607/http://www.sterrenlab.com/camps/eso-astronomy-camp-2017/"> ESO Astronomy Camp 2017 </a></li><li class=""><a href="https://web.archive.org/web/20200815115607/https://web.archive.org/web/20190722044743/http://www.sterrenlab.com/camps/eso-astronomy-camp-2016/"> ESO Astronomy Camp 2016 </a></li><li class=""><a href="https://web.archive.org/web/20200815115607/https://web.archive.org/web/20190810160701/http://www.sterrenlab.com/camps/eso-astronomy-camp-2015/"> ESO Astronomy Camp 2015 </a></li><li class=""><a href="https://web.archive.org/web/20200815115607/https://web.archive.org/web/20190321214717/http://www.sterrenlab.com/camps/eso-astronomy-camp-2014/"> ESO Astronomy Camp 2014 </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/outreach/eduoff/teacherschools/"> Teacher Schools </a></li><li class="submenu"><a href="/web/20200815115607/https://eso.org/public/outreach/eduoff/prev-programmes/"> Previous Programmes <span class="desktop-children topmenu-arrow fa fa-angle-right"></span></a><span class="mobile-children"><span class="fa fa-angle-down"></span></span><ul id="submenu-aim-503" class="submenu-aim sublevel"><li class=""><a href="https://web.archive.org/web/20200815115607/http://www.eaae-astronomy.org/catchastar/cas2013"> Catch a Star 2013 </a></li><li class=""><a href="https://web.archive.org/web/20200815115607/http://www.eaae-astronomy.org/catchastar/cas2011"> Catch a Star 2011 </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/outreach/eduoff/cas/cas2008/"> Catch a Star 2008 </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/outreach/eduoff/cas/cas2007/"> Catch a Star 2007 </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/outreach/eduoff/cas/cas2005/"> Catch a Star 2005 </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/outreach/eduoff/cas/cas2004/"> Catch a Star 2004 </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/outreach/eduoff/cas/cas2003/"> Catch a Star 2003 </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/outreach/eduoff/cas/cas2002/"> Catch a Star 2002 </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/outreach/eduoff/liu/"> Life in the Universe </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/outreach/eduoff/pos/"> Physics On Stage </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/outreach/eduoff/seaspace/docs/"> Sea & Space </a></li></ul></li><li class=""><a href="https://web.archive.org/web/20200815115607/http://kids.alma.cl/?lang=en"> ALMA Kids </a></li></ul></li><li class="submenu"><a href="/web/20200815115607/https://eso.org/public/outreach/partnerships/"> Partnerships <span class="desktop-children topmenu-arrow fa fa-angle-right"></span></a><span class="mobile-children"><span class="fa fa-angle-down"></span></span><ul id="submenu-aim-516" class="submenu-aim sublevel"><li class=""><a href="/web/20200815115607/https://eso.org/public/outreach/partnerships/translators/"> Volunteer Translators </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/outreach/partnerships/eson/"> ESO Science Outreach Network </a></li><li class="submenu"><a href="/web/20200815115607/https://eso.org/public/outreach/partnerships/chile/"> Collaborations in Chile <span class="desktop-children topmenu-arrow fa fa-angle-right"></span></a><span class="mobile-children"><span class="fa fa-angle-down"></span></span><ul id="submenu-aim-519" class="submenu-aim sublevel"><li class=""><a href="/web/20200815115607/https://eso.org/public/outreach/partnerships/chile/2010/"> 2010 </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/outreach/partnerships/chile/2009/"> 2009 </a></li></ul></li><li class=""><a href="/web/20200815115607/https://eso.org/public/outreach/partnerships/eso-ambassadors/"> ESO Outreach Ambassadors </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/outreach/partnerships/organisations/"> ESO Outreach Partner Organisations </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/outreach/partnerships/educators/"> Informal Educators </a></li><li class=""><a href="https://web.archive.org/web/20200815115607/http://eso.us2.list-manage1.com/subscribe?u=c35dd77ef962de779092c970b&id=bd58d6ae8d"> Outreach Newsletter Form </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/outreach/partnerships/photo-ambassadors/"> ESO Photo Ambassadors </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/outreach/partnerships/music-ambassadors/"> ESO Music Ambassadors </a></li></ul></li><li class=""><a href="https://web.archive.org/web/20200815115607/https://www.eso.org/public/outreach/first-picture-of-a-black-hole/blog/"> Taking the First Picture of a Black Hole </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/outreach/communication-resources/"> Astronomy Communication Resources </a></li><li class=""><a href="https://web.archive.org/web/20200815115607/http://www.spacetelescope.org/"> The Hubble Space Telescope </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/outreach/gems/"> Cosmic Gems </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/outreach/social/"> Social Media </a></li><li class="submenu"><a href="/web/20200815115607/https://eso.org/public/outreach/ultra-high-definition/"> Ultra HD Expedition <span class="desktop-children topmenu-arrow fa fa-angle-right"></span></a><span class="mobile-children"><span class="fa fa-angle-down"></span></span><ul id="submenu-aim-533" class="submenu-aim sublevel"><li class=""><a href="/web/20200815115607/https://eso.org/public/outreach/ultra-high-definition/team/"> Meet our Heroes </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/outreach/ultra-high-definition/journey/"> Journey Schedule </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/outreach/ultra-high-definition/equipment/"> Equipment </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/outreach/ultra-high-definition/technology-partners/"> Technology Partners </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/outreach/ultra-high-definition/blog/"> Blog </a></li></ul></li><li class=""><a href="/web/20200815115607/https://eso.org/public/outreach/for_planetariums/"> For Planetariums </a></li><li class=""><a href="https://web.archive.org/web/20200815115607/http://www.eso.org/public/outreach/webcams/"> Webcams </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/outreach/your_eso_pictures/"> Your ESO Pictures </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/outreach/astroprize/"> European Astronomy Journalism Prize </a></li><li class="submenu"><a href="/web/20200815115607/https://eso.org/public/outreach/hiddentreasures/"> Hidden Treasures <span class="desktop-children topmenu-arrow fa fa-angle-right"></span></a><span class="mobile-children"><span class="fa fa-angle-down"></span></span><ul id="submenu-aim-543" class="submenu-aim sublevel"><li class=""><a href="/web/20200815115607/https://eso.org/public/outreach/hiddentreasures/rules/"> Hidden Treasures Rules </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/outreach/hiddentreasures/instructions/"> Hidden Treasures Instructions </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/outreach/hiddentreasures/science_archive/"> Hidden Treasures Form </a></li><li class=""><a href="https://web.archive.org/web/20200815115607/http://www.flickr.com/groups/esohiddentreasures/"> Flickr Upload </a></li></ul></li><li class="submenu"><a href="/web/20200815115607/https://eso.org/public/outreach/department/"> Our Team <span class="desktop-children topmenu-arrow fa fa-angle-right"></span></a><span class="mobile-children"><span class="fa fa-angle-down"></span></span><ul id="submenu-aim-548" class="submenu-aim sublevel"><li class=""><a href="/web/20200815115607/https://eso.org/public/outreach/department/students/"> Students and Visitors </a></li><li class=""><a href="https://web.archive.org/web/20200815115607/http://supernova.eso.org/join-us/"> Join us </a></li></ul></li><li class=""><a href="https://web.archive.org/web/20200815115607/http://supernova.eso.org/"> ESO Supernova </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/outreach/art/"> Art at ESO </a></li><li class=""><a href="/web/20200815115607/https://eso.org/public/outreach/data2dome/"> Data2Dome </a></li><li class=""><a href="https://web.archive.org/web/20200815115607/https://www.eso.org/public/blog/"> ESOblog </a></li> </ul> </div> </div> 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class="col-md-12"> </div> </div> <div class="row page"> <div class="col-md-9 left-column"> <h1>A guiding star</h1><div class="archive-image archive-image-dark popup"><a class="popup" href="https://web.archive.org/web/20200815115607/https://cdn.eso.org/images/screen/potw1443a.jpg" title="A guiding star"/><img class="img-responsive" src="https://web.archive.org/web/20200815115607im_/https://cdn.eso.org/images/thumb700x/potw1443a.jpg" alt="A guiding star" srcset="/web/20200815115607im_/https://eso.org/public/archives/images/medium/potw1443a.jpg 320w, https://web.archive.org/web/20200815115607im_/https://cdn.eso.org/images/news/potw1443a.jpg 180w, /web/20200815115607im_/https://eso.org/public/archives/images/newsmini/potw1443a.jpg 60w, https://web.archive.org/web/20200815115607im_/https://cdn.eso.org/images/screen/potw1443a.jpg 1280w, https://web.archive.org/web/20200815115607im_/https://cdn.eso.org/images/thumb700x/potw1443a.jpg 700w, /web/20200815115607im_/https://eso.org/public/archives/images/thumbs/potw1443a.jpg 122w" sizes="(min-width: 1000px) 700px, 100vw"/></a></div><p><p>A solitary laser beam cuts through the night sky. It streaks upwards from Unit Telescope 4 of ESO's <a href="/web/20200815115607/https://eso.org/public/teles-instr/vlt.html">Very Large Telescope</a>, located at Paranal Observatory in Chile. The two Magellanic Clouds are visible to the left of the beam as faint, fuzzy patches against the starry background. The particularly bright star to the right of the beam is Canopus, the second brightest star in our night sky after Sirius.</p><p>When ground-based telescopes view stars, the light they collect must travel through the layers of our atmosphere. The same water vapour, pollution, and turbulence that causes the stars in the sky to twinkle also result in blurred images — so in comes a technique known as <a href="/web/20200815115607/https://eso.org/public/teles-instr/technology/adaptive_optics.html">adaptive optics</a>.</p><p>Adaptive optics systems use sophisticated deformable mirrors to counteract the negative effects of our atmosphere. The laser shines up into the sky, creating an artificial star about 90 kilometres from the ground. Astronomers can then measure how this fake star twinkles in time, and can correct for this distortion. Telescopes that use adaptive optics can produce images sharper than those from space-based telescopes at certain wavelengths.</p><p>A similar system is to be installed on the <a href="/web/20200815115607/https://eso.org/public/teles-instr/e-elt.html">European Extremely Large Telescope</a> (E-ELT). The E-ELT will have six lasers, which will provide even higher-quality astronomical images over a much larger field-of-view — and provide more opportunities for striking snaps like this one.</p><p>This image was taken on 4 March 2013 from the Visible and Infrared Survey Telescope for Astronomy (VISTA) platform by <a href="/web/20200815115607/https://eso.org/public/outreach/partnerships/photo-ambassadors.html">ESO photo ambassador</a> Julien Girard, a staff astronomer at ESO. It was taken using a point and shoot compact camera which nowadays can perform night photography.</p></p><strong>Credit:</strong><div class="credit"><p>ESO/<a href="https://web.archive.org/web/20200815115607/http://www.juliengirard.space/" target="_blank" rel="noopener">J. Girard</a> (djulik.com)</p></div><div class="copyright"><a href="/web/20200815115607/https://eso.org/public/outreach/copyright/">Usage of ESO Images, Videos, Web texts and Music</a><br/><a href="/web/20200815115607/https://eso.org/public/outreach/pressmedia/#epodpress_form">Are you a journalist? Subscribe to the ESO Media Newsletter in your language.</a></div> </div> <div class="col-md-3 right-column"> <div class="archive-search"><a href="/web/20200815115607/https://eso.org/public/images/search/" class="advanced-search" data-container="body" data-toggle="tooltip" data-placement="left" title="Advanced Search"><span class="fa fa-plus"></span></a><form class="form-inline" role="form" action="/web/20200815115607/https://eso.org/public/images/" method="GET"><div class="form-group"><div class="input-group"><input id="id_archivesearch" type="text" value="" placeholder="Search..." name="search" class="form-control input-sm"/><span class="input-group-btn"><button class="btn btn-default btn-sm" type="submit"><span class="fa fa-search"></span></button></span></div></div></form></div> <div class="object-info"><h3>About the Image</h3><div><table><tr><td class="title">Id:</td><td>potw1443a</td></tr><tr><td class="title">Type:</td><td>Photographic</td></tr><tr><td class="title">Release date:</td><td>27 October 2014, 10:00</td></tr><tr><td class="title">Size:</td><td>3372 x 5058 px</td></tr></table></div><hr><h3>About the Object</h3><div><table><tr><td class="title">Name:</td><td><a href="https://web.archive.org/web/20200815115607/http://en.wikipedia.org/wiki/Cerro_Paranal">Cerro Paranal</a>, <a href="https://web.archive.org/web/20200815115607/http://simbad.u-strasbg.fr/simbad/sim-id?Ident=Large+Magellanic+Cloud">Large Magellanic Cloud</a>, <a href="https://web.archive.org/web/20200815115607/http://simbad.u-strasbg.fr/simbad/sim-id?Ident=Small+Magellanic+Cloud">Small Magellanic Cloud</a>, <a href="https://web.archive.org/web/20200815115607/https://en.wikipedia.org/wiki/Very_Large_Telescope">Very Large Telescope</a></td></tr><tr><td class="title">Type:</td><td>Unspecified : Technology : Observatory : Telescope<br/>Local Universe : Galaxy<br/>Solar System : Sky Phenomenon : Night Sky : Milky Way</td></tr><tr><td class="title">Category:</td><td><a href="/web/20200815115607/https://eso.org/public/images/archive/category/paranal/">Paranal</a><br></td></tr></table></div><hr></div> <div><h3 class="archivegrouptitle">Image Formats</h3><div class="archive_download"><span class="archive_dl_icon"><img src="/web/20200815115607im_/https://eso.org/public/archives/djp/icons/icon_phot.1785b79e10fb.png"/></span><span class="archive_dl_text"><a href="/web/20200815115607/https://eso.org/public/archives/images/original/potw1443a.tif">Fullsize Original</a></span><span class="archive_dl_size"><div> 23.2 MB <a class="download-info" role="button" tabindex="0" data-toggle="popover" data-html="true" data-trigger="focus" data-placement="bottom" data-content="<strong>Note:</strong><br>Crediting this image with the full credit line, in a visible way is MANDATORY, if you want to use it without paying a fee. 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