{"id":206,"date":"2026-04-08T14:37:31","date_gmt":"2026-04-08T06:37:31","guid":{"rendered":"https:\/\/www.astro.ncu.edu.tw\/ncutwom\/?page_id=206"},"modified":"2026-04-09T09:24:23","modified_gmt":"2026-04-09T01:24:23","slug":"2-meter-telescope","status":"publish","type":"page","link":"https:\/\/www.astro.ncu.edu.tw\/ncutwom\/?page_id=206","title":{"rendered":"2-Meter Telescope"},"content":{"rendered":"\n<p class=\"has-x-large-font-size\">Optical System<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Optical Design:<\/strong> F\/8 Ritchey\u2013Chr\u00e9tien system <\/li>\n\n\n\n<li><strong>Aperture:<\/strong> 2 m <\/li>\n\n\n\n<li><strong>Primary Focal Ratio:<\/strong> F\/2.2 <\/li>\n\n\n\n<li><strong>Image Quality:<\/strong> 80% encircled energy within 0.4 arcsec on-axis <\/li>\n\n\n\n<li><strong>Wavelength Range:<\/strong> 0.35\u20132.5 \u03bcm <\/li>\n\n\n\n<li><strong>Field of View:<\/strong>\n<ul class=\"wp-block-list\">\n<li>Cassegrain focus: 1 degree<\/li>\n\n\n\n<li>Nasmyth focus: 12 arcmin<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<figure data-wp-context=\"{&quot;imageId&quot;:&quot;69e534e12a314&quot;}\" data-wp-interactive=\"core\/image\" data-wp-key=\"69e534e12a314\" class=\"wp-block-image size-full is-style-default wp-lightbox-container\"><img loading=\"lazy\" decoding=\"async\" width=\"623\" height=\"434\" data-wp-class--hide=\"state.isContentHidden\" data-wp-class--show=\"state.isContentVisible\" data-wp-init=\"callbacks.setButtonStyles\" data-wp-on--click=\"actions.showLightbox\" data-wp-on--load=\"callbacks.setButtonStyles\" data-wp-on-window--resize=\"callbacks.setButtonStyles\" src=\"https:\/\/www.astro.ncu.edu.tw\/ncutwom\/wp-content\/uploads\/2026\/04\/image-5.png\" alt=\"\" class=\"wp-image-209\" srcset=\"https:\/\/www.astro.ncu.edu.tw\/ncutwom\/wp-content\/uploads\/2026\/04\/image-5.png 623w, https:\/\/www.astro.ncu.edu.tw\/ncutwom\/wp-content\/uploads\/2026\/04\/image-5-300x209.png 300w\" sizes=\"auto, (max-width: 623px) 100vw, 623px\" \/><button\n\t\t\tclass=\"lightbox-trigger\"\n\t\t\ttype=\"button\"\n\t\t\taria-haspopup=\"dialog\"\n\t\t\taria-label=\"\u653e\u5927\"\n\t\t\tdata-wp-init=\"callbacks.initTriggerButton\"\n\t\t\tdata-wp-on--click=\"actions.showLightbox\"\n\t\t\tdata-wp-style--right=\"state.imageButtonRight\"\n\t\t\tdata-wp-style--top=\"state.imageButtonTop\"\n\t\t>\n\t\t\t<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" fill=\"none\" viewBox=\"0 0 12 12\">\n\t\t\t\t<path fill=\"#fff\" d=\"M2 0a2 2 0 0 0-2 2v2h1.5V2a.5.5 0 0 1 .5-.5h2V0H2Zm2 10.5H2a.5.5 0 0 1-.5-.5V8H0v2a2 2 0 0 0 2 2h2v-1.5ZM8 12v-1.5h2a.5.5 0 0 0 .5-.5V8H12v2a2 2 0 0 1-2 2H8Zm2-12a2 2 0 0 1 2 2v2h-1.5V2a.5.5 0 0 0-.5-.5H8V0h2Z\" \/>\n\t\t\t<\/svg>\n\t\t<\/button><\/figure>\n\n\n\n<p class=\"has-x-large-font-size\">Available Foci<\/p>\n\n\n\n<p>The telescope provides <strong>three observing foci<\/strong>, including one <strong>Cassegrain focus<\/strong> and two <strong>Nasmyth foci<\/strong>.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The <strong>Cassegrain focus<\/strong> supports instruments up to <strong>500 kg<\/strong>, with maximum dimensions of <strong>2 m \u00d7 2 m \u00d7 2 m<\/strong>. <\/li>\n\n\n\n<li>Each <strong>Nasmyth focus<\/strong> is equipped with a <strong>1.5 m \u00d7 1.5 m instrument platform<\/strong>, supporting payloads up to <strong>500 kg<\/strong>.<\/li>\n\n\n\n<li> Focus switching is achieved via a motorized tertiary mirror controlled by the telescope control system, with switching time <strong>less than 60 seconds<\/strong>.<\/li>\n<\/ul>\n\n\n\n<p class=\"has-x-large-font-size\">Mount<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Mount Type:<\/strong> Friction-driven Alt-Azimuth mount <\/li>\n\n\n\n<li><strong>Maximum Slew Speed:<\/strong> 4\u00b0\/s <\/li>\n\n\n\n<li><strong>Pointing Accuracy:<\/strong> 2 arcsec (RMS) after software correction at elevations above 30\u00b0 <\/li>\n\n\n\n<li><strong>Tracking Accuracy:<\/strong> Tracking error &lt; 0.3 arcsec over 10 minutes at elevations above 30\u00b0 <\/li>\n\n\n\n<li><strong>Total Installation Height:<\/strong> 8,664 mm<\/li>\n<\/ul>\n\n\n\n<p class=\"has-x-large-font-size\">Control Interface<\/p>\n\n\n\n<p>The 2-Meter Telescope control cabinet manages telescope pointing, slewing, and tracking operations, and also performs focus switching and automatic synchronization of the Nasmyth field rotator.<\/p>\n\n\n\n<p>Since the observatory dome follows Nishimura\u2019s integrated design, the system also enables synchronized dome control during observations. The control cabinet communicates with the main server via <strong>TCP\/IP connections<\/strong> for command transmission and system coordination.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Control Software:<\/strong>\n<ul class=\"wp-block-list\">\n<li>Native control software provided by Nishimura operates under a Windows environment and supports full command execution and system monitoring. However, external connectivity is not supported.<\/li>\n\n\n\n<li>Therefore, a dedicated telescope control system is currently being developed using <strong>UNAM\u2019s web-based observing platform<\/strong>. The new system will integrate:\n<ul class=\"wp-block-list\">\n<li>automated scheduling<\/li>\n\n\n\n<li>environmental monitoring<\/li>\n\n\n\n<li>data storage and distribution<\/li>\n\n\n\n<li>data preprocessing<\/li>\n\n\n\n<li>alert systems<\/li>\n\n\n\n<li>interruption recovery and automatic restart mechanisms<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>These developments aim to enable <strong>future remote and fully autonomous observing operations<\/strong>.<\/li>\n<\/ul>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Optical System Available Foci The telescope provides th [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":"[]"},"class_list":["post-206","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.astro.ncu.edu.tw\/ncutwom\/index.php?rest_route=\/wp\/v2\/pages\/206","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.astro.ncu.edu.tw\/ncutwom\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.astro.ncu.edu.tw\/ncutwom\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.astro.ncu.edu.tw\/ncutwom\/index.php?rest_route=\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.astro.ncu.edu.tw\/ncutwom\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=206"}],"version-history":[{"count":9,"href":"https:\/\/www.astro.ncu.edu.tw\/ncutwom\/index.php?rest_route=\/wp\/v2\/pages\/206\/revisions"}],"predecessor-version":[{"id":287,"href":"https:\/\/www.astro.ncu.edu.tw\/ncutwom\/index.php?rest_route=\/wp\/v2\/pages\/206\/revisions\/287"}],"wp:attachment":[{"href":"https:\/\/www.astro.ncu.edu.tw\/ncutwom\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=206"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}