CASPEC | 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"><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"><li class=""><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 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class="submenu-aim sublevel"><li class=""><a href="https://www.eso.org/public/science/event-horizon/"> First image of a black hole </a></li><li class=""><a href="https://www.eso.org/public/science/EHT-MilkyWay/"> First image of the Milky Way central black hole </a></li><li class=""><a href="https://www.eso.org/public/science/gc/"> More about the black hole at the galactic centre </a></li></ul></li><li class=""><a href="/public/science/grb/"> Gamma-Ray Bursts </a></li><li class=""><a href="/public/science/archive/"> Science Archive </a></li> </ul> </div> </div> </li> <li><a href="/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-434" class="submenu-aim"> <li class=""><a href="/public/events/press-evt/"> Press Events </a></li><li class="submenu"><a href="/public/events/special-evt/"> Special Events <span 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<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>CASPEC</h1> <h2>Cassegrain Echelle Spectrograph</h2> <div style="position: relative; overflow: hidden; height: 253px; margin-bottom: 30px;"><a href="/public/images/AGIL1676-CC/"> <img style="position: absolute; top: 200%; left: 0; right: 0; bottom: -100%; margin: auto;" src="/public/archives/images/screen/AGIL1676-CC.jpg" alt="CASPEC on rest" border="0" /> </a></div> <div class="row"> <div class="col-md-8"> <p dir="ltr">The Cassegrain Echelle Spectrograph (CASPEC) instrument was the first major ESO-built instrument at the Cassegrain focus of the <a href="http://www.eso.org/public/usa/teles-instr/lasilla/36/">ESO 3.6-metre telescope</a> at <a href="http://www.eso.org/public/usa/teles-instr/lasilla/">La Silla Observatory</a>, in Chile. The decision to build such an instrument was taken in 1974, but due to ESO’s move from Geneva, Switzerland to Garching, Germany and the difficulties in procuring a suitable 2D detector, tests at the ESO 3.6-metre telescope only started in June 1983. Visiting astronomers could observe with CASPEC from 1 April 1984.</p> <p dir="ltr">CASPEC was able to obtain high-resolution spectroscopic observations of stars, nuclei of galaxies and quasi-stellar objects (QSOs) as faint as <a href="https://en.wikipedia.org/wiki/Magnitude_(astronomy)">magnitude </a>16 with its <a href="https://en.wikipedia.org/wiki/Signal-to-noise_ratio">signal-to-noise ratio</a>, that were only then possible to obtain with large coudé instruments. This gave ESO astronomers the possibility to carry out detailed observations of the physical conditions and abundances of faint stars and extragalactic observations at this spectral resolution for the first time.</p> <p dir="ltr">Over time, CASPEC was upgraded to optical cameras and several CCDs of increasing sensitivity and resolution. During its 15-year lifetime, CASPEC was used for a large variety of scientific programs and contributed to many important discoveries. In 1987, for example, CASPEC helped in the discovery of the <a href="http://www.eso.org/public/portugal/news/eso8713/">most distant known object</a> in the Universe at that time. About ten years later CASPEC helped studying a major transition period in the early Universe, providing a <a href="http://www.eso.org/public/news/eso9720/">high-resolution spectrum</a> of a bright southern quasar.</p> <p dir="ltr">CASPEC was decommissioned in 1999.</p> <h2>Science highlights with CASPEC</h2> <ul> <li>Newly discovered quasar is most distant known object in the Universe (<a href="https://www.eso.org/public/news/eso8713/">eso8713</a>)</li> <li>Detailed observations of a bright supernova in Centaurus A suggest that this galaxy is much closer than previously thought (<a href="https://www.eso.org/public/news/eso8608/">eso8608</a>)</li> </ul> <p dir="ltr"> </p> </div> <div class="col-md-4"> <table class="table table-bordered" width="100%"> <tbody> <tr> <td> <h3 dir="ltr">CASPEC</h3> <p><small>This table lists the global capabilities of the instrument.</small></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">ESO 3.6-m telescope</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">Optical Echelle spectrograph</td> </tr> <tr> <td valign="top"><strong>Wavelength range:</strong></td> <td valign="top">350–1000 nm</td> </tr> <tr> <td valign="top"><strong>Special resolution:</strong></td> <td valign="top">seeing limited</td> </tr> <tr> <td valign="top"><strong>Spectral resolution:</strong></td> <td valign="top">R ~20000-65000</td> </tr> <tr> <td valign="top"><strong>First light:</strong></td> <td valign="top">June 1983</td> </tr> <tr> <td valign="top"><strong>Science goals:</strong></td> <td valign="top"> <ul> <li dir="ltr">Physical conditions and abundances of faint stars</li> <li dir="ltr">Nuclei of galaxies</li> <li dir="ltr">QSOs</li> </ul> </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=97&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 <strong>instrument</strong>:</strong></td> <td valign="top"><a href="/public/images/archive/search/?adv=&subject_name=CASPEC">Link</a></td> </tr> <tr> <td valign="top"><strong>Press Releases with the <strong>instrument</strong>:</strong></td> <td valign="top"><a href="/public/news/archive/search/?published_until_year=0&published_until_day=0&description=&title=&instruments=97&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"><strong>Consortium:</strong></td> <td valign="top"> <ul> <li>ESO</li> </ul> </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" rel="stylesheet" type="text/css" /> <script type="text/javascript">var MEDIA_URL = "/public/archives/"</script> <script type="text/javascript" src="/public/archives/djp/js/main.04a7335af5a0.js" charset="utf-8"></script> </div>  <div id="social-share" 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