{"id":31554,"date":"2025-03-30T11:59:26","date_gmt":"2025-03-30T06:29:26","guid":{"rendered":"https:\/\/vajiramandravi.com\/current-affairs\/?p=31554"},"modified":"2025-04-16T12:53:06","modified_gmt":"2025-04-16T07:23:06","slug":"geostationary-transfer-orbit-gto","status":"publish","type":"post","link":"https:\/\/vajiramandravi.com\/current-affairs\/geostationary-transfer-orbit-gto\/","title":{"rendered":"Geostationary Transfer Orbit (GTO)"},"content":{"rendered":"<h2>Geostationary Transfer Orbit (GTO) Latest News<\/h2>\n<p>ISRO\u2019s Breakthrough in Semi-Cryogenic Engine Development for LVM3<\/p>\n<h2>Why in the News?<\/h2>\n<ul>\n<li><strong>ISRO has achieved a breakthrough<\/strong> in developing a <strong>semi-cryogenic engine<\/strong> (liquid oxygen\/kerosene engine) with a high thrust of <strong>2,000 kN<\/strong> (kilonewtons).<\/li>\n<li>The <strong>first successful hot test<\/strong> of the <strong>Engine Power Head Test Article (PHTA)<\/strong> was conducted at the <strong>ISRO Propulsion Complex, Mahendragiri, Tamil Nadu.<\/strong><\/li>\n<li>This engine will be used in the <strong>semi-cryogenic booster stage of the Launch Vehicle Mark-3 (LVM3)<\/strong>, enhancing India&#8217;s space launch capabilities.<\/li>\n<\/ul>\n<h2>About Geosynchronous Transfer Orbit (GTO)<\/h2>\n<h3>What is a Transfer Orbit?<\/h3>\n<ul>\n<li>A <strong>Transfer Orbit<\/strong> is used to move a satellite from <strong>one circular orbit to another<\/strong> in a fuel-efficient manner.<\/li>\n<li>The <strong>Hohmann Transfer Orbit<\/strong> is a commonly used maneuver for such transfers.<\/li>\n<\/ul>\n<h3>Geostationary Transfer Orbit (GTO)<\/h3>\n<ul>\n<li><strong>GTO is a highly elliptical orbit<\/strong> with:\n<ul>\n<li><strong>Perigee (closest point to Earth):<\/strong> 180-200 km above Earth\u2019s surface.<\/li>\n<li><strong>Apogee (farthest point from Earth):<\/strong> ~35,900 km (near geostationary orbit).<\/li>\n<\/ul>\n<\/li>\n<li><strong>Why is GTO Used?<\/strong>\n<ul>\n<li><strong>Satellites are first placed in GTO<\/strong> before they use their <strong>own propulsion system<\/strong> to move to a <strong>final geostationary orbit (GEO).<\/strong><\/li>\n<li>This <strong>reduces the energy required from the launch vehicle<\/strong>, making it more <strong>fuel-efficient.<\/strong><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2>What is a Semi-Cryogenic Engine?<\/h2>\n<p>A <strong>semi-cryogenic engine<\/strong> is a type of <strong>liquid rocket engine<\/strong> that uses:<\/p>\n<ul>\n<li><strong>Liquid Oxygen (LOX) as an oxidiser<\/strong> (cryogenic component).<\/li>\n<li><strong>Refined kerosene (RP-1) as fuel<\/strong> (stored at ambient temperature).<\/li>\n<\/ul>\n<h2>Significance of ISRO\u2019s Semi-Cryogenic Engine Development<\/h2>\n<ul>\n<li><strong>Engine power head test success: <\/strong>The <strong>hot test of the Power Head Test Article (PHTA)<\/strong> was conducted for <strong>2.5 seconds<\/strong> to validate the <strong>ignition and boost strap mode operation.<\/strong>\n<ul>\n<li>All engine parameters performed as expected.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Developed by: Liquid Propulsion Systems Centre (LPSC)<\/strong> under ISRO.<\/li>\n<li><strong>Upcoming plans: <\/strong>Further <strong>series of tests<\/strong> on PHTA before realizing the <strong>fully integrated engine.<\/strong><\/li>\n<li><strong>Replacement for Current LVM3 Core Stage:<\/strong>\n<ul>\n<li>The <strong>SC120 stage<\/strong> (powered by <strong>SE2000 engine<\/strong>) will <strong>replace the existing L110 stage<\/strong> in LVM3.<\/li>\n<li><strong>Payload capacity in Geosynchronous Transfer Orbit (GTO) to increase from 4 tonnes to 5 tonnes.<\/strong><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2>Cryogenic vs Semi-Cryogenic Engines<\/h2>\n<figure class=\"table\">\n<table>\n<tbody>\n<tr>\n<td>\n<p><strong>Feature<\/strong><\/p>\n<\/td>\n<td>\n<p><strong>Cryogenic Engine (LOX + LH2)<\/strong><\/p>\n<\/td>\n<td>\n<p><strong>Semi-Cryogenic Engine (LOX + Kerosene)<\/strong><\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p><strong>Oxidizer used<\/strong><\/p>\n<\/td>\n<td>\n<p>Liquid Oxygen (LOX)<\/p>\n<\/td>\n<td>\n<p>Liquid Oxygen (LOX)<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p><strong>Fuel used<\/strong><\/p>\n<\/td>\n<td>\n<p>Liquid Hydrogen (LH2)<\/p>\n<\/td>\n<td>\n<p>Refined Kerosene (RP-1)<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p><strong>Storage<\/strong><\/p>\n<\/td>\n<td>\n<p>Requires <strong>ultra-cold storage<\/strong> (-253\u00b0C)<\/p>\n<\/td>\n<td>\n<p>Can be <strong>stored at normal temperature<\/strong><\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p><strong>Efficiency<\/strong><\/p>\n<\/td>\n<td>\n<p><strong>Lower density impulse<\/strong><\/p>\n<\/td>\n<td>\n<p><strong>Higher density impulse<\/strong> (more efficient thrust)<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p><strong>Cost<\/strong><\/p>\n<\/td>\n<td>\n<p>Expensive<\/p>\n<\/td>\n<td>\n<p><strong>More cost-effective<\/strong><\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p><strong>Handling<\/strong><\/p>\n<\/td>\n<td>\n<p><strong>Difficult to store and handle<\/strong><\/p>\n<\/td>\n<td>\n<p><strong>Easier to store and handle<\/strong><\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p><strong>Used in<\/strong><\/p>\n<\/td>\n<td>\n<p><strong>Cryogenic Upper Stages<\/strong> of rockets<\/p>\n<\/td>\n<td>\n<p><strong>Booster stages of heavy-lift launch vehicles<\/strong><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<h2>Geostationary Transfer Orbit (GTO) FAQs<\/h2>\n<p><strong>Q1: <\/strong>What is a Geosynchronous Transfer Orbit (GTO)?<br \/>\n<strong>Ans<\/strong>: GTO is an elliptical orbit used to transfer satellites from low Earth orbit (LEO) to a geostationary orbit (GEO) using a propulsion system.<\/p>\n<p><strong>Q2: <\/strong>What is the difference between GTO and GEO?<br \/>\n<strong>Ans<\/strong>: GTO is a temporary elliptical orbit, whereas GEO is a circular orbit where satellites remain fixed relative to Earth\u2019s surface.<\/p>\n<p><strong>Q3: <\/strong>Why do rockets first place satellites in GTO instead of directly in GEO?<br \/>\n<strong>Ans<\/strong>: Direct placement in GEO requires more fuel; GTO allows satellites to use onboard propulsion to reach GEO efficiently.<\/p>\n<p><strong>Q4: <\/strong>What is the typical altitude range of GTO?<br \/>\n<strong>Ans<\/strong>: The perigee (closest point to Earth) is around 180-250 km, while the apogee (farthest point) is nearly 35,786 km.<\/p>\n<p><strong>Source: <\/strong><a href=\"https:\/\/www.thehindu.com\/sci-tech\/isro-achieves-breakthrough-in-semicryogenic-engine-development-for-lvm3\/article69389411.ece\" target=\"_blank\" rel=\"nofollow noopener\">TH<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>GTO is an elliptical orbit used to transfer satellites from low Earth orbit (LEO) to a geostationary orbit (GEO) using a propulsion system.<\/p>\n","protected":false},"author":5,"featured_media":31555,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":{"0":"post-31554","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-upsc-prelims-current-affairs","8":"no-featured-image-padding"},"acf":[],"_links":{"self":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts\/31554","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/comments?post=31554"}],"version-history":[{"count":0,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts\/31554\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/media\/31555"}],"wp:attachment":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/media?parent=31554"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/categories?post=31554"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/tags?post=31554"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}