Auxiliary Telescopes - Very Large Telescope Interferometer

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href="/web/20210419223950/https://www.eso.org/public/teles-instr/paranal-observatory/vlt/vlt-instr/isaac/"> ISAAC </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/paranal-observatory/vlt/vlt-instr/kmos/"> KMOS </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/paranal-observatory/vlt/vlt-instr/mad/"> MAD </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/paranal-observatory/vlt/vlt-instr/matisse/"> MATISSE </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/paranal-observatory/vlt/vlt-instr/midi/"> MIDI </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/paranal-observatory/vlt/vlt-instr/moons/"> MOONS </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/paranal-observatory/vlt/vlt-instr/muse/"> MUSE </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/paranal-observatory/vlt/vlt-instr/naco/"> NACO </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/paranal-observatory/vlt/vlt-instr/naomi/"> NAOMI </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/paranal-observatory/vlt/vlt-instr/pionier/"> PIONIER </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/paranal-observatory/vlt/vlt-instr/sinfoni/"> SINFONI </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/paranal-observatory/vlt/vlt-instr/sphere/"> SPHERE </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/paranal-observatory/vlt/vlt-instr/uves/"> UVES </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/paranal-observatory/vlt/vlt-instr/vimos/"> VIMOS </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/paranal-observatory/vlt/vlt-instr/visir/"> VISIR </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/paranal-observatory/vlt/vlt-instr/x-shooter/"> X-shooter </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/paranal-observatory/vlt/vlt-instr/vtl-test-cameras/"> VLT Test Cameras </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/paranal-observatory/vlt/vlt-instr/vinci/"> VINCI </a></li></ul></li><li class="submenu"><a href="/web/20210419223950/https://www.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-277" class="submenu-aim sublevel"><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/paranal-observatory/vlt/vlt-names/antu/"> Antu </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/paranal-observatory/vlt/vlt-names/kueyen/"> Kueyen </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/paranal-observatory/vlt/vlt-names/melipal/"> Melipal </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/paranal-observatory/vlt/vlt-names/yepun/"> Yepun </a></li></ul></li><li class=" current current-leaf"><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/paranal-observatory/vlt/auxiliarytelescopes/"> Auxiliary Telescopes </a></li></ul></li><li class="submenu"><a href="/web/20210419223950/https://www.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 id="submenu-aim-283" class="submenu-aim sublevel"><li class="submenu"><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/paranal-observatory/surveytelescopes/vista/"> VISTA <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-284" class="submenu-aim sublevel"><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/paranal-observatory/surveytelescopes/vista/mirror/"> The VISTA mirror </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/paranal-observatory/surveytelescopes/vista/camera/"> VIRCAM </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/paranal-observatory/surveytelescopes/vista/4most/"> 4MOST </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/paranal-observatory/surveytelescopes/vista/surveys/"> The VISTA surveys </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/paranal-observatory/surveytelescopes/vista/consortium/"> The VISTA consortium </a></li></ul></li><li class="submenu"><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/paranal-observatory/surveytelescopes/vst/"> VST <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-290" class="submenu-aim sublevel"><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/paranal-observatory/surveytelescopes/vst/mirror/"> The VST mirrors </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/paranal-observatory/surveytelescopes/vst/camera/"> OmegaCAM </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/paranal-observatory/surveytelescopes/vst/surveys/"> The VST surveys </a></li></ul></li></ul></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/paranal-observatory/speculoos/"> SPECULOOS </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/paranal-observatory/ngts/"> NGTS </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/paranal-observatory/cta/"> Cherenkov Telescope Array </a></li></ul></li><li class="submenu"><a href="/web/20210419223950/https://www.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-297" class="submenu-aim sublevel"><li class="submenu"><a href="/web/20210419223950/https://www.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-298" class="submenu-aim sublevel"><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/swedish/simba/"> SIMBA </a></li></ul></li><li class="submenu"><a href="/web/20210419223950/https://www.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-300" class="submenu-aim sublevel"><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/ntt/efosc2/"> EFOSC2 </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/ntt/emmi/"> EMMI </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/ntt/irspec/"> IRSPEC </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/ntt/sofi/"> SOFI </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/ntt/soxs/"> SOXS </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/ntt/susi2/"> SUSI and SUSI2 </a></li></ul></li><li class="submenu"><a href="/web/20210419223950/https://www.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-307" class="submenu-aim sublevel"><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/36/adonis/"> ADONIS </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/36/caspec/"> CASPEC </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/36/irspec/"> IRSPEC </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/36/harps/"> HARPS </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/36/mefos/"> MEFOS </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/36/nirps/"> NIRPS </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/36/optopus/"> OPTOPUS </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/36/timmi2/"> TIMMI/2 </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/36/36-infrared-photometer-spectrophotometer/"> Infrared Photometer/Spectrophotometer </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/36/36-standard-photometer/"> Standard Photometer </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/36/infrared-specklegraph/"> Infrared Specklegraph </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/36/infrared-speckle-interferometer/"> Infrared Speckle Interferometer </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/36/efosc/"> EFOSC </a></li></ul></li><li class="submenu"><a href="/web/20210419223950/https://www.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-321" class="submenu-aim sublevel"><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/mpg22/feros/"> FEROS </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/mpg22/grond/"> GROND </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/mpg22/irac2/"> IRAC & IRAC2 </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/mpg22/pisco/"> PISCO </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/mpg22/wfi/"> WFI </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/mpg22/infrared-photometer-spectrophotometer/"> Infrared Photometer/Spectrophotometer </a></li></ul></li><li class="submenu"><a href="/web/20210419223950/https://www.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-328" class="submenu-aim sublevel"><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/swiss/coralie/"> CORALIE </a></li></ul></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/rem/"> Rapid Eye Mount telescope </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/trappist/"> TRAnsiting Planets and PlanetesImals Small Telescope–South </a></li><li class="submenu"><a href="/web/20210419223950/https://www.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-332" class="submenu-aim sublevel"><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/danish154/coravel/"> CORAVEL </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/danish154/dfosc/"> DFOSC </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/danish154/ccd/"> CCD camera </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/danish154/hb-photometer/"> Hβ Photometer </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/danish154/two-channel-photometer/"> Two-Channel Photometer </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/danish154/four-channel-photometer/"> Four-Channel Photometer </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/danish154/six-channel-photometer/"> Six-Channel uvby-Hβ Photometer </a></li></ul></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/tarot/"> Télescope à Action Rapide pour les Objets Transitoires </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/1mschmidt/"> ESO 1-metre Schmidt telescope </a></li><li class="submenu"><a href="/web/20210419223950/https://www.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-342" class="submenu-aim sublevel"><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/152metre/bandc/"> Boller and Chivens Spectrograph </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/152metre/coude/"> Coudé Spectrograph </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/152metre/echelec/"> ECHELEC </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/152metre/rv-cass-spectrograph/"> RV Cass Spectrograph </a></li></ul></li><li class="submenu"><a href="/web/20210419223950/https://www.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-347" class="submenu-aim sublevel"><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/1metre/fideos/"> FIDEOS </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/1metre/infrared-photometer/"> Infrared Photometer </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/1metre/single-channel-photometer/"> Single-Channel Photometer </a></li></ul></li><li class="submenu"><a href="/web/20210419223950/https://www.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-351" class="submenu-aim sublevel"><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/05metre/single-channel-photometer/"> Single-Channel Photometer </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/05metre/double-channel-photometer/"> Double-Channel Photometer </a></li></ul></li><li class="submenu"><a href="/web/20210419223950/https://www.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-354" class="submenu-aim sublevel"><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/coude/ces/"> CES </a></li></ul></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/marly/"> MarLy 1-metre telescope </a></li><li class="submenu"><a href="/web/20210419223950/https://www.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-357" class="submenu-aim sublevel"><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/09metre/walraven/"> Walraven Photometer </a></li></ul></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/t70/"> Swiss T70 telescope </a></li><li class="submenu"><a href="/web/20210419223950/https://www.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-360" class="submenu-aim sublevel"><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/bochum/bochum-scanner/"> Bochum Scanner </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/bochum/bochum-photometer/"> Bochum Photometer </a></li></ul></li><li class="submenu"><a href="/web/20210419223950/https://www.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-363" class="submenu-aim sublevel"><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/danish05/danish-two-channel-hb-photometer/"> Two-Channel Hβ Photometer </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/danish05/danish-four-channel-uvby-photometer/"> Four-Channel uvby Photometer </a></li><li class=""><a href="/web/20210419223950/https://www.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/20210419223950/https://www.eso.org/public/teles-instr/lasilla/gpo/"> Grand Prisme Objectif telescope </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/swiss04/"> Swiss 0.4-metre telescope </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/marseille/"> Marseille 0.36-metre telescope </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/grb/"> GRB Monitoring System </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/mascara/"> MASCARA </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/blackgem/"> BlackGEM </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/extra/"> ExTrA </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/lasilla/test-bed/"> Test-Bed Telescope </a></li></ul></li><li class="submenu"><a href="/web/20210419223950/https://www.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-375" class="submenu-aim sublevel"><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/apex/artemis/"> ArTéMiS </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/apex/laboca/"> LABOCA </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/apex/saboca/"> SABOCA </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/apex/sepia/"> SEPIA </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/apex/apex-2a/"> APEX–2A </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/apex/aszca/"> ASZCa </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/apex/champ-plus/"> CHAMP+ </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/apex/flash/"> FLASH </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/apex/flash-plus/"> FLASH+ </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/apex/mpi_11thz/"> MPI_1.1THz </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/apex/p-artemis/"> P-ArTéMiS </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/apex/pi230/"> PI230 </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/apex/polka/"> PolKa </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/apex/shefi/"> SHeFI </a></li></ul></li><li class="submenu"><a href="/web/20210419223950/https://www.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-390" class="submenu-aim sublevel"><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/alma/antennas/"> Antennas </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/alma/transporters/"> Transporters </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/alma/interferometry/"> Interferometry </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/alma/receiver-bands/"> Receiver Bands </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/alma/residencia/"> ALMA Residencia </a></li></ul></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/elt/"> ELT </a></li><li class="submenu"><a href="/web/20210419223950/https://www.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-397" class="submenu-aim sublevel"><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/technology/active_optics/"> Active Optics </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/technology/adaptive_optics/"> Adaptive Optics </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/technology/ifu/"> Integral Field Units </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/technology/interferometry/"> Interferometry </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/technology/spectroscopy/"> Spectroscopy </a></li></ul></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/teles-instr/instruments/"> Instruments </a></li> </ul> </div> </div> </li> <li><a href="/web/20210419223950/https://www.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-404" class="submenu-aim"> <li class=""><a href="/web/20210419223950/https://www.eso.org/public/science/top10/"> ESO Top 10 Astronomical Discoveries </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/science/exoplanets/"> Exoplanets </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/science/gravitationalwaves/"> Gravitational Wave Sources </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/science/gc/"> Black Hole at the Centre of our Galaxy </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/science/grb/"> Gamma-Ray Bursts </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/science/archive/"> Science Archive </a></li> </ul> </div> </div> </li> <li><a href="/web/20210419223950/https://www.eso.org/public/events/">Events<span class="fa fa-angle-down 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Day 2017 </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/announcements/ann16071/"> Open House Day 2016 </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/events/special-evt/MeetESO/"> #MeetESO </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/events/special-evt/openhouse15/"> Long Night of Science 2015 </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/events/special-evt/astronet2014/"> ASTRONET 2014 </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/events/special-evt/openhouse14/"> Open House Day 2014 </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/events/special-evt/eeltblast/"> ELT Groundbreaking </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/events/special-evt/cafe-and-kosmos/"> Café & Kosmos in Munich </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/events/special-evt/openhouse13/"> Open House Day 2013 </a></li><li class="submenu"><a href="/web/20210419223950/https://www.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-425" class="submenu-aim sublevel"><li class=""><a href="/web/20210419223950/https://www.eso.org/public/events/special-evt/astronet2013/dates/"> Important Dates </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/events/special-evt/astronet2013/registration/"> Registration, Fees and Payment </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/events/special-evt/astronet2013/abstracts/"> Abstract Submission </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/events/special-evt/astronet2013/venue/"> Workshop 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<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-436" class="submenu-aim sublevel"><li class=""><a href="/web/20210419223950/https://www.eso.org/public/events/special-evt/50years/message/"> Message from the DG </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/events/special-evt/50years/50highlights50years/"> Fifty Highlights </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/events/special-evt/50years/competitions/"> Competitions </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/events/special-evt/50years/twitter/"> Twitter Feed </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/events/special-evt/50years/webcast/"> Webcast </a></li><li class="submenu"><a href="/web/20210419223950/https://www.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-442" class="submenu-aim sublevel"><li class=""><a href="/web/20210419223950/https://www.eso.org/public/events/special-evt/50years/europetothestars/news/"> News </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/events/special-evt/50years/europetothestars/movie/"> Movie </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/events/special-evt/50years/europetothestars/book/"> Book </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/events/special-evt/50years/europetothestars/reviews/"> Reviews </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/events/special-evt/50years/europetothestars/bios/"> Bios </a></li><li class=""><a 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href="/web/20210419223950/https://www.eso.org/public/events/special-evt/awesome-universe/venues/"> List of venues </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/events/special-evt/awesome-universe/organisers/"> For Exhibitors </a></li></ul></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/events/special-evt/iya2009/"> IYA 2009 </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/events/special-evt/100ha/"> 100 Hours of Astronomy </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/events/special-evt/theeye/"> The Eye 3D </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/events/special-evt/imax-hidden-universe/"> IMAX® 3D Film Hidden Universe </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/events/special-evt/openhouse11/"> Open House Day 2011 </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/events/special-evt/openhouse09/"> Open House Day 2009 (German) </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/outreach/bond/"> Bond at Paranal </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/events/special-evt/lndw-2007eng/"> Long Night of Science 2007 </a></li><li class="submenu"><a href="/web/20210419223950/https://www.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-463" class="submenu-aim sublevel"><li class=""><a href="/web/20210419223950/https://www.eso.org/public/events/special-evt/openhouse/ohd06-winnerslist/"> List of Prize Winners </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/events/special-evt/openhouse/tdot06/"> Deutsche Fassung </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/events/special-evt/openhouse/tdot06-gewinnerliste/"> Liste der Preisgewinner </a></li></ul></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/events/special-evt/pt-011203/"> Public Talks 2003 </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/events/special-evt/eso40years/"> ESO 40 Years (1962 - 2002) </a></li></ul></li><li class="submenu"><a href="/web/20210419223950/https://www.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-469" class="submenu-aim sublevel"><li class=""><a href="/web/20210419223950/https://www.eso.org/public/events/exhibitions/perma_exhibitions/"> ESO Permanent Exhibitions </a></li><li class=""><a href="https://web.archive.org/web/20210419223950/http://www.esof.eu/"> EuroScience Open Forum (ESOF) </a></li><li class=""><a href="https://web.archive.org/web/20210419223950/http://eas.unige.ch/EWASS2016/"> EWASS 2016 </a></li><li class=""><a href="https://web.archive.org/web/20210419223950/https://aas.org/meetings/aas227"> AAS Winter 2016 </a></li></ul></li><li class="submenu"><a href="/web/20210419223950/https://www.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-474" class="submenu-aim sublevel"><li class=""><a href="/web/20210419223950/https://www.eso.org/public/events/astro-evt/solareclipse2019/"> Total Solar Eclipse 2019 </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/events/astro-evt/mcnaught2007/"> The Comet McNaught 2007 </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/events/astro-evt/deepimpact/"> Deep Impact - 04.07.2005 </a></li><li class=""><a href="https://web.archive.org/web/20210419223950/http://www.vt-2004.org/"> The Venus Transit - 08.11.2004 </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/events/astro-evt/leonids99/"> The Leonids - 17.11.1999 </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/events/astro-evt/eclipse99/"> Solar Eclipse at ESO HQ - 11.08.1999 </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/events/astro-evt/leonids98/"> The Leonids - 11.1998 </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/events/astro-evt/pathfinder/"> Mars Pathfinder - 1997 </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/events/astro-evt/hyakutake/"> Comet Hyakutake - 1997 </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/events/astro-evt/sl9/"> SL-9 and Jupiter - 1994 </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/events/astro-evt/hale-bopp/"> Comet Hale Bopp - 1994 </a></li></ul></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/events/seminars/"> Astronomy Communication Seminars </a></li> </ul> </div> </div> </li> <li><a href="/web/20210419223950/https://www.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-487" class="submenu-aim"> <li class="submenu"><a href="/web/20210419223950/https://www.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-488" class="submenu-aim sublevel"><li class=""><a href="/web/20210419223950/https://www.eso.org/public/products/education/"> Educational Material </a></li><li class=""><a href="https://web.archive.org/web/20210419223950/http://www.scienceinschool.org/" target="_blank"> Science in School </a></li><li class=""><a href="https://web.archive.org/web/20210419223950/http://www.sterrenlab.com/camps/eso-astronomy-camp-2017/"> ESO Astronomy Camp 2017 </a></li><li class=""><a href="https://web.archive.org/web/20210419223950/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/20210419223950/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/20210419223950/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/20210419223950/https://www.eso.org/public/outreach/eduoff/teacherschools/"> Teacher Schools </a></li><li class="submenu"><a href="/web/20210419223950/https://www.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-496" class="submenu-aim sublevel"><li class=""><a href="https://web.archive.org/web/20210419223950/http://www.eaae-astronomy.org/catchastar/cas2013"> Catch a Star 2013 </a></li><li class=""><a href="https://web.archive.org/web/20210419223950/http://www.eaae-astronomy.org/catchastar/cas2011"> Catch a Star 2011 </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/outreach/eduoff/cas/cas2008/"> Catch a Star 2008 </a></li><li class=""><a href="/web/20210419223950/https://www.eso.org/public/outreach/eduoff/cas/cas2007/"> Catch a Star 2007 </a></li><li 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data-dismiss="alert" aria-label="Close"><span aria-hidden="true">×</span></button> Couldn't save page :( Please try again. </div> </div> <div class="page-content"> <div id="editable-content"> <div class="title section"> <h1>Auxiliary Telescopes</h1> <p><a href="/web/20210419223950/https://www.eso.org/public/images/eso-vlt-at-yb-2062/"><img src="/web/20210419223950im_/https://www.eso.org/public/archives/static/teles-instr/vlt/images/eso-vlt-at-yb-2062.jpg" alt=""></a></p> <div class="row"> <div class="col-md-8"> <p>The four Auxiliary Telescopes (ATs) are 1.8m diameter telescopes that feed light into the Very Large Telescope Interferometer at ESO's Paranal Observatory. Uniquely for telescopes of this size, they can be moved from place to place around the VLT platform and are self-contained. They were built by AMOS (Belgium). Further information can be found here: <a href="https://web.archive.org/web/20210419223950/http://www.eso.org/public/news/eso0402/">eso0402</a>.</p> <p>The top part of each AT is a round enclosure, made from two sets of three segments, which open and close. The role of the enclosure is to protect the delicate 1.8-metre telescope from the desert conditions. The enclosure is supported by the boxy transporter section, which also contains electronics cabinets, liquid cooling systems, air-conditioning units, power supplies, and more. During astronomical observations the enclosure and transporter are mechanically isolated from the telescope, to ensure that no vibrations compromise the data collected.</p> <p>VLT Auxiliary Telescope enclosure:</p> <ul> <li>Height: 630 cm</li> <li>Diameter: 390 cm</li> </ul> <p>The transporter section runs on tracks, so the ATs can be moved to 30 different observing locations. As the VLT Interferometer (VLTI) acts rather like a single telescope as large as the group of telescopes combined, changing the positions of the ATs means that the VLTI can be adjusted according to the needs of the observing project.</p> <div id="paranalWebcam"> <h2>Latest Images</h2> <p>Follow the Auxiliary Telescopes on these live images updated every hour during daytime. The telescopes can be relocated to many different stations to change their geometric configuration. The live images show some of the most used stations, but there might be no telescope there. Click on the thumbnails to enlarge.</p> <div class="webcam-wrapper" style="width:100%"> <a href="https://web.archive.org/web/20210419223950/https://www.eso.org/public/archives/static/pano/latest/POI/preset_4.jpg"><img src="/web/20210419223950im_/https://www.eso.org/public/archives/static/pano/latest/POI/preset_4.jpg" border="0"></a> <div class="webcam-timestamp"><span class="pano-timestamp">Webcam | 02 May 2018 12:12 CEST</span></div> <div class="webcam-live">LIVE</div> </div> <p style="text-align: center;"><small>A1 station LIVE (<span class="pano-timestamp">02 May 2018 12:12 CEST</span>). Here you may be able to see the AT1 </small></p> <br> <div class="webcam-wrapper" style="width:100%"> <a href="https://web.archive.org/web/20210419223950/https://www.eso.org/public/archives/static/pano/latest/POI/preset_3.jpg"><img src="/web/20210419223950im_/https://www.eso.org/public/archives/static/pano/latest/POI/preset_3.jpg" border="0"></a> <div class="webcam-timestamp"><span class="pano-timestamp">Webcam | 02 May 2018 12:12 CEST</span></div> <div class="webcam-live">LIVE</div> </div> <p style="text-align: center;"><small>K0 station LIVE (<span class="pano-timestamp">02 May 2018 12:12 CEST</span>). Here you may be able to see the AT3. On extremely clear days the magnificent 6739-metre volcano Llullaillaco is visible in the background of this photograph. It is an amazing 190 kilometres away on the border with Argentina.</small></p> <br> <div class="webcam-wrapper" style="width:100%"> <a href="https://web.archive.org/web/20210419223950/https://www.eso.org/public/archives/static/pano/latest/POI/preset_5.jpg"><img src="/web/20210419223950im_/https://www.eso.org/public/archives/static/pano/latest/POI/preset_5.jpg" border="0"></a> <div class="webcam-timestamp"><span class="pano-timestamp">Webcam | 02 May 2018 12:12 CEST</span></div> <div class="webcam-live">LIVE</div> </div> <p style="text-align: center;"><small>G1 station LIVE (<span class="pano-timestamp">02 May 2018 12:12 CEST</span>). Here you may be able to see the AT4</small></p> </div> </div> <div class="col-md-4"> <table class="table table-bordered" width="100%"> <tbody> <tr> <td> <h3>Auxiliary Telescopes</h3> <table class="table"> <tbody> <tr> <td valign="top" width="60"><strong>Name:</strong></td> <td valign="top">Auxiliary Telescopes</td> </tr> <tr> <td valign="top" width="60"><strong>Site:</strong></td> <td valign="top">Cerro Paranal</td> </tr> <tr> <td valign="top" width="60"><strong>Altitude:</strong></td> <td valign="top">2635 m</td> </tr> <tr> <td valign="top"><strong>Enclosure:</strong></td> <td valign="top">Relocatable dome</td> </tr> <tr> <td valign="top"><strong>Type:</strong></td> <td valign="top">Relocatable interferometric telescope</td> </tr> <tr> <td valign="top"><strong>Optical design:</strong></td> <td valign="top">Ritchey-Chrétien with Coudé optical train</td> </tr> <tr> <td valign="top"><strong>Diameter. Primary M1:</strong></td> <td valign="top">1.82 m</td> </tr> <tr> <td valign="top"><strong>Material. Primary M1:</strong></td> <td valign="top">ZeroDur</td> </tr> <tr> <td valign="top"><strong>Diameter. Secondary M2:</strong></td> <td valign="top">0.14 m</td> </tr> <tr> <td valign="top"><strong>Material. Secondary M2:</strong></td> <td valign="top">ZeroDur</td> </tr> <tr> <td valign="top"><strong>Diameter. Tertiary M3:</strong></td> <td valign="top">0.15 x 0.11 m (elliptical flat)</td> </tr> <tr> <td valign="top"><strong>Mount:</strong></td> <td valign="top">Alt-Azimuth mount</td> </tr> <tr> <td valign="top"><strong>First Light date:</strong></td> <td valign="top">AT1: 24 January 2004, AT2: 2 February 2005, AT3: 1 November 2005, AT4: 15 December 2006</td> </tr> <tr> <td valign="top"><strong>Active Optics:</strong></td> <td valign="top">yes (passive M1, hexapod control of M2)</td> </tr> <tr> <td valign="top"><strong>Adaptive Optics:</strong></td> <td valign="top">in future NAOMI</td> </tr> <tr> <td valign="top"><strong>Interferometry: </strong></td> <td valign="top">UT & AT maximum 202 m baseline</td> </tr> <tr> <td valign="top"><strong>Images taken with the ATs:</strong></td> <td valign="top"><a href="https://web.archive.org/web/20210419223950/http://www.eso.org/public/images/archive/search/?adv=&facility=72">Link</a></td> </tr> <tr> <td valign="top"><strong>Images of the ATs:</strong></td> <td valign="top"><a href="https://web.archive.org/web/20210419223950/http://www.eso.org/public/images/archive/search/?adv=&subject_name=Auxiliary%20Telescope">Link</a></td> </tr> <tr> <td valign="top"><strong>Videos of the ATs:</strong></td> <td valign="top"><a href="https://web.archive.org/web/20210419223950/http://www.eso.org/public/videos/archive/search/?adv=&subject_name=Auxiliary%20Telescope">Link</a></td> </tr> <tr> <td valign="top"><strong>Press Releases with the ATs:</strong></td> <td valign="top"><a href="https://web.archive.org/web/20210419223950/http://www.eso.org/public/news/archive/search/?adv=&facility=72">Link</a></td> </tr> </tbody> </table> </td> </tr> </tbody> </table> </div> </div> </div> </div> </div> </div> </div> </div>  <div class="row footernote"> <div class="col-xs-12 col-md-3"> <a href="https://web.archive.org/web/20210419223950/mailto:information@eso.org">Send us your comments!</a> </div> <div class="col-xs-12 col-md-3"> <a href="/web/20210419223950/https://www.eso.org/public/outreach/newsletters/esonews/">Subscribe to receive news from ESO in your language</a> </div> <div class="col-xs-12 col-md-3"> <a href="https://web.archive.org/web/20210419223950/https://www.cdn77.com/">Accelerated by CDN77</a> </div> <div class="col-xs-12 col-md-3"> <a href="/web/20210419223950/https://www.eso.org/public/about-eso/privacy/">Terms & Conditions</a> </div> </div> <link href="/web/20210419223950cs_/https://www.eso.org/public/archives/djp/css/extras.166b25c68b97.css" rel="stylesheet" type="text/css"/> <script type="text/javascript">var MEDIA_URL = "/public/archives/"</script> <script type="text/javascript" src="/web/20210419223950js_/https://www.eso.org/public/archives/djp/js/main.86f0f17c90d3.js" charset="utf-8"></script> <script type="text/javascript"> const getWebcamStatus = async (cam) => { const url = '/public/outreach/webcamstatus/' + cam + '/'; 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