CES | ESO

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href="/public/teles-instr/paranal-observatory/surveytelescopes/vista/4most/"> 4MOST </a></li><li class=""><a href="/public/teles-instr/paranal-observatory/surveytelescopes/vista/surveys/"> The VISTA surveys </a></li><li class=""><a href="/public/teles-instr/paranal-observatory/surveytelescopes/vista/consortium/"> The VISTA consortium </a></li></ul></li><li class="submenu"><a href="/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-308" class="submenu-aim sublevel"><li class=""><a href="/public/teles-instr/paranal-observatory/surveytelescopes/vst/mirror/"> The VST mirrors </a></li><li class=""><a href="/public/teles-instr/paranal-observatory/surveytelescopes/vst/camera/"> OmegaCAM </a></li><li class=""><a href="/public/teles-instr/paranal-observatory/surveytelescopes/vst/surveys/"> The VST surveys 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href="/public/teles-instr/lasilla/05metre/double-channel-photometer/"> Double-Channel Photometer </a></li></ul></li><li class="submenu current"><a href="/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-372" class="submenu-aim sublevel selected current current-leaf"><li class=" current current-leaf"><a href="/public/teles-instr/lasilla/coude/ces/"> CES </a></li></ul></li><li class=""><a href="/public/teles-instr/lasilla/marly/"> MarLy 1-metre telescope </a></li><li class="submenu"><a href="/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-375" class="submenu-aim sublevel"><li class=""><a href="/public/teles-instr/lasilla/09metre/walraven/"> Walraven Photometer </a></li></ul></li><li class=""><a href="/public/teles-instr/lasilla/t70/"> Swiss T70 telescope </a></li><li class="submenu"><a href="/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-378" class="submenu-aim sublevel"><li class=""><a href="/public/teles-instr/lasilla/bochum/bochum-scanner/"> Bochum Scanner </a></li><li class=""><a href="/public/teles-instr/lasilla/bochum/bochum-photometer/"> Bochum Photometer </a></li></ul></li><li class="submenu"><a href="/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-381" class="submenu-aim sublevel"><li class=""><a href="/public/teles-instr/lasilla/danish05/danish-two-channel-hb-photometer/"> Two-Channel Hβ Photometer </a></li><li class=""><a href="/public/teles-instr/lasilla/danish05/danish-four-channel-uvby-photometer/"> Four-Channel uvby Photometer </a></li><li class=""><a href="/public/teles-instr/lasilla/danish05/danish-six-channel-uvby-hb-photometer/"> Six-Channel uvby–Hβ Photometer </a></li></ul></li><li class=""><a href="/public/teles-instr/lasilla/gpo/"> Grand Prisme Objectif telescope </a></li><li class=""><a href="/public/teles-instr/lasilla/swiss04/"> Swiss 0.4-metre telescope </a></li><li class=""><a href="/public/teles-instr/lasilla/marseille/"> Marseille 0.36-metre telescope </a></li><li class=""><a href="/public/teles-instr/lasilla/grb/"> GRB Monitoring System </a></li><li class=""><a href="/public/teles-instr/lasilla/mascara/"> MASCARA </a></li><li class=""><a href="/public/teles-instr/lasilla/blackgem/"> BlackGEM </a></li><li class=""><a 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<div class="sprites-esologo"></div> <span>European<br>Southern<br>Observatory</span> </div> </a> </div> <div class="container " id="body"> <div class="row no-page"> <div class="col-md-12"> </div> </div> <div class="row page"> <div class="col-md-12 one-column"> <div id="edit-info-block"> <div id="page-edit-success" class="alert alert-success alert-dismissible" role="alert" style="display: none"> <button type="button" class="close" data-dismiss="alert" aria-label="Close"><span aria-hidden="true">×</span></button> Page saved successfully </div> <div id="page-edit-failure" class="alert alert-danger alert-dismissible" role="alert" style="display: none"> <button type="button" class="close" 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"> <h1>CES</h1> <h2>Coudé Echelle Spectrometer</h2> <div style="position: relative; overflow: hidden; height: 253px; margin-bottom: 30px;"><a href="/public/images/lso-360cat/"> <img style="position: absolute; top: -100%; left: 0; right: 0; bottom: -100%; margin: auto;" src="/public/archives/images/screen/lso-360cat.jpg" alt="ESO Coudé Auxiliary Telescope (CAT)" border="0" /> </a></div> <div class="row"> <div class="col-md-8"> <p>The ESO Coudé Echelle Spectrometer (CES) was an instrument installed at <a href="/public/teles-instr/lasilla/">La Silla Observatory</a> at the beginning of the 1980s. It was designed to observe and analyse objects in the sky, such as the chemical composition of stars, at a very high resolution.</p> <p>The CES installed on the 3.6-metre building was originally designed to be fed either from the Coude focus of the <a href="/public/teles-instr/lasilla/36/">ESO 3.6-metre telescope</a> or from the <a href="/public/teles-instr/lasilla/coude/">Coude Auxiliary Telescope</a> (CAT), located in a separate building. Almost all the observations have been conducted with the CAT Telescope via a light tunnel connecting the CAT and the 3.6-metre building. Fiber link tests and a few observations were later done, with both the CAT and the ESO 3.6-metre telescope.</p> <p>Some of the main characteristics of CES were the high resolving power and the computer-controlled support, which was a new way to operate, and was partly unknown by some astronomers at the time. “<em>The user's interface has been designed to be as friendly as possible to observers, above all to visiting astronomers who may not be totally familiar with a computer-controlled instrument and the ESO image-processing system,</em>” said Daniel Enard, one of the principal designers of CES in his article in <a href="/public/archives/messengers/pdf/messenger_0026.pdf">The Messenger Issue 26</a>.</p> <p>CES underwent several upgrades during the years. New components like a <a href="https://en.wikipedia.org/wiki/Charge-coupled_device" target="_blank" rel="noopener">CCD detector</a>, image slicers and cameras were added, and remote operations from ESO HQ were implemented. In addition, new targets like exoplanets were included in science cases until the beginning of the 2000s, when CES was decommissioned.</p> <h2>Science highlights with CES</h2> <ul> <li>CES detects lots of lead in three different binary star systems (<a href="https://www.eso.org/public/news/eso0129/">eso0129</a>)</li> <li>New extrasolar planet found at La Silla Observatory as a companion to iota Horologii (iota Hor) (<a href="https://www.eso.org/public/news/eso9938/">eso9938</a>)</li> <li>First observations of a long-lived radioactive isotope outside the Solar System indicate that the Universe may be younger than previously thought (<a href="https://www.eso.org/public/news/eso8710/">eso8710</a>)</li> </ul> <p> </p> </div> <div class="col-md-4"> <table class="table table-bordered" width="100%"> <tbody> <tr> <td> <h3>CES</h3> <p><span style="color: #333333; font-family: 'Helvetica Neue LT ESO', 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 11.96px;">This table lists the global capabilities of the instrument.</span></p> <table class="table"> <tbody> <tr> <td valign="top" width="30"><strong>Location:</strong></td> <td valign="top">Decommissioned</td> </tr> <tr> <td valign="top" width="30"><strong>Telescope:</strong></td> <td valign="top"><a href="/public/teles-instr/lasilla/36/">ESO 3.6-metre telescope</a></td> </tr> <tr> <td valign="top"><strong>Focus:</strong></td> <td valign="top">Cassegrain</td> </tr> <tr> <td valign="top"><strong>Type:</strong></td> <td valign="top">Visible Spectrograph</td> </tr> <tr> <td valign="top"><strong>Wavelength coverage:</strong></td> <td valign="top">360-1100 nm</td> </tr> <tr> <td valign="top"><strong>Spatial resolution:</strong></td> <td valign="top"> </td> </tr> <tr> <td valign="top"><strong>Spectral resolution:</strong></td> <td valign="top"> </td> </tr> <tr> <td valign="top"><strong>First light:</strong></td> <td valign="top"><a href="/public/archives/messengers/pdf/messenger_0026.pdf">May 1981</a></td> </tr> <tr> <td valign="top"><strong><strong>Science goal:</strong></strong></td> <td valign="top"> </td> </tr> <tr> <td valign="top"><strong>Images taken with the instrument:</strong></td> <td valign="top"><a href="https://www.eso.org/public/images/archive/search/?ranking=0&fov=0&release_id=&minimum_size=0&description=&published_until_year=0&credit=&published_until_month=0&title=&subject_name=&instrument=60&published_until_day=0&published_since_day=0&published_since_month=0&id=&published_since_year=0">Link</a></td> </tr> <tr> <td valign="top"><strong>Images of the instrument:</strong></td> <td valign="top"><a href="/public/images/archive/search/?adv=&subject_name=Coudé Echelle Spectrometer">Link</a></td> </tr> <tr> <td valign="top"><strong>Videos related to the instrument:</strong></td> <td valign="top"><a href="http://www.eso.org/public/videos/?search=Coud%C3%A9+Echelle+Spectrometer">Link</a></td> </tr> <tr> <td valign="top"><strong>Press releases with the instrument:</strong></td> <td valign="top"><a href="/public/news/archive/search/?published_until_year=0&published_until_day=0&description=&title=&instruments=60&subject_name=&published_since_day=0&published_since_month=0&published_until_month=0&id=&published_since_year=0">Link</a></td> </tr> <tr> <td valign="top"> <p><strong>Consortium:</strong></p> </td> <td valign="top">ESO</td> </tr> </tbody> </table> </td> </tr> </tbody> </table> </div> </div> </div> </div> </div> </div> </div>  <div class="row footernote"> <div class="col-xs-12 col-md-3"> <a href="mailto:information@eso.org">Send us your comments!</a> </div> <div class="col-xs-12 col-md-3"> <a href="/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://www.cdn77.com">Accelerated by CDN77</a> </div> <div class="col-xs-12 col-md-3"> <a href="/public/about-eso/privacy/">Terms & Conditions</a> </div> </div> <link href="/public/archives/djp/css/extras.d3e54451ebbb.css" 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