- \n
- UPDATES GSLV\/GSAT-6<\/li>\n
- 65 Launch Vehicle Manuals (L2)<\/li>\n
- Click here to Join L2<\/li>\n<\/ul>\n
Following the success of the previous launch \u2013 which carried the GSAT-14 spacecraft to orbit in January 2014 \u2013 ISRO was hoping for the GSLV\u2019s first back-to-back successes since the type\u2019s second and third flights in 2003 and 2004 respectively. That proved to be the case.<\/p>\n
The GSLV\u2019s Mark I and II configurations differ in that the Mark I uses a third stage powered by a Russian-built engine, while the Mark II introduces a replacement using Indian components.<\/p>\n
A third rocket, the GSLV Mark III, made its maiden flight last December. However, this is essentially a new rocket sharing little more than a name with its predecessors.<\/p>\n
![\"2015-08-27-091812\"](\"https:\/\/www.nasaspaceflight.com\/wp-content\/uploads\/2015\/08\/2015-08-27-091812-350x246.jpg\")
The payload of Thursday\u2019s launch, GSAT-6, is a 2,117-kilogram (4,667 lb) communications satellite constructed by ISRO around the I-2K satellite bus.<\/p>\nSpaceX
<\/path>NASA mission updates <\/path>NASA educational resources <\/path>\n (adsbygoogle = window.adsbygoogle || []).push({});<\/p>\n
Designed for nine to twelve years of service, the satellite carries an 80-centimetre (2.6 ft) C-band antenna for providing a single fixed beam and a six metre (16-foot) deployable antenna that will facilitate five S-band spot beams. Electrical power comes from a pair of solar arrays generating 3.1 kilowatts for the spacecraft\u2019s systems.<\/p>\n
Following launch the spacecraft will make use of a liquid bipropellant apogee motor, fuelled by monomethylhydrazine and mixed oxides of nitrogen, to achieve geostationary orbit where it will be operated at a longitude of 83 degrees east. According to reports the satellite will most likely be used to relay military communications.<\/p>\n
![\"2015-08-27-092034\"](\"https:\/\/www.nasaspaceflight.com\/wp-content\/uploads\/2015\/08\/2015-08-27-092034-350x282.jpg\")
Ahead of the launch, which took place from the Second Launch Pad at the Satish Dhawan Space Centre, assembly of the rocket and payload integration took place vertically away from the launch pad in the centre\u2019s vehicle assembly building. The rocket was moved to the launch pad atop a mobile platform on Saturday 22 August.<\/p>\nThursday\u2019s launch was the fifteenth from the Second Pad \u2013 one of two complexes that India\u2019s GSLV and PSLV rockets can fly from along with the nearby First Launch Pad.<\/p>\n
Since the completion of the second pad in 2005, the GSLV has flown only from the newer pad with the PSLV launching from whichever is available for it. Past launches from the second pad have included nine PSLVs, five GSLVs, and a single suborbital launch of the GSLV Mark III last December.<\/p>\n
![\"2014-12-18](\"https:\/\/www.nasaspaceflight.com\/wp-content\/uploads\/2014\/12\/2014-12-18-01_02_17-ISRO-GSLV-Google-Search-350x219.jpg\")
The GSLV that deployed GSAT-6 was a Mark II vehicle, featuring India\u2019s indigenous cryogenic upper stage in place of the Russian-engined version used on the Mark I.<\/p>\nThursday\u2019s launch was the third flight of the Mark II GSLV, whose maiden flight was the unsuccessful attempt to orbit GSAT-4 in 2010, but which has achieved success with the more recent launch of GSAT-14 in 2014. The serial number of the rocket which will be used for the GSAT-6 mission is GSLV-D6.<\/p>\n
The first stage of the GSLV consists of four L40-H strap-on liquid rocket motors clustered around a solid-fuel core stage powered by an S139 motor.<\/p>\n
![\"2015-08-27-092340\"](\"https:\/\/www.nasaspaceflight.com\/wp-content\/uploads\/2015\/08\/2015-08-27-092340-350x252.jpg\")
Each powered by a Vikas liquid rocket motor burning 42.6 tonnes (41.9 Imperial tons, 47.0 US tons) of fuel, the strap-ons make use of a mixture of unsymmetrical dimethylhydrazine and hydrazine hydrate, in a ratio of three parts to one, oxidised by dinitrogen tetroxide.<\/p>\nThe four strap-on motors ignited around 4.8 seconds in advance of liftoff, with the solid-fuelled core igniting once the countdown reached zero.<\/p>\n
The first stage core burned for one minute and forty-six seconds before depleting its hydroxyl-terminated polybutadiene (HTPB) fuel. After this, thrust continued to be generated by the four strap-on motors until their shutdown two minutes and 29 seconds into the mission.<\/p>\n
![\"2015-08-27-092454\"](\"https:\/\/www.nasaspaceflight.com\/wp-content\/uploads\/2015\/08\/2015-08-27-092454-350x238.jpg\")
Half a second after cutoff, the second stage separated from the spent first. Ignition of the second stage\u2019s Vikas engine occurred about another half a second after staging.<\/p>\nSeparation of the payload fairing from the nose of the rocket occurred three minutes and fifty seconds after launch, with the rocket at an altitude of approximately 115.45 kilometres.<\/p>\n
The GSLV\u2019s second stage completed its two-minute, 40-second burn at the four minute and forty-nine second mark in the mission. Separating four seconds after cutoff, the spent stage made way for the third stage to begin its burn.<\/p>\n
Powered by a single cryogenic engine fuelled by liquid hydrogen and liquid oxygen, the third stage fired for two seconds short of twelve minutes to raise GSAT-6 into its targeted deployment orbit.<\/p>\n
![\"2015-08-27-092526\"](\"https:\/\/www.nasaspaceflight.com\/wp-content\/uploads\/2015\/08\/2015-08-27-092526-350x246.jpg\")
Spacecraft separation occurred twelve seconds after the end of the GSLV\u2019s powered flight, at 17 minutes and four seconds mission elapsed time.<\/p>\nThursday\u2019s launch was aiming for a geosynchronous transfer orbit with a perigee of 170 kilometres (106 miles, 91.8 nautical miles) an apogee of 35,975 kilometres (22354 miles, 19425 nautical miles) and 19.95 degrees inclination.<\/p>\n
India\u2019s third orbital launch of 2015 \u2013 following PSLV missions in March and July \u2013 Thursday\u2019s launch was the first and only planned GSLV launch of 2015.<\/p>\n
The rocket is next expected to fly in 2016 carrying the GSAT-9 spacecraft. Before then ISRO will launch several Polar Satellite Launch Vehicles, with the smaller rocket\u2019s next launch currently slated to carry the AstroSat-1 astronomy spacecraft and several smaller payloads at the end of September.<\/p>\n
The GSAT-6 launch was the forty-second launch that will attempt to achieve orbit this year \u2013 a number which includes the Proton-M and Falcon 9 launches in May and June that failed to achieve orbit, the April Soyuz-2-1a failure with Progress M-27M which nonetheless reached orbit, and the February Vega launch which briefly attained orbit following a successful suborbital primary mission.<\/p>\n
(Images via ISRO)<\/p>\n","protected":false},"excerpt":{"rendered":"
India\u2019s Geosynchronous Satellite Launch Vehicle has successfully deployed a communications satellite Thursday, with the rocket\u2019s ninth flight lofting the GSAT-6 spacecraft. The launch was on schedule at 16:52 local time (11:22 UTC) with the launch taking place from the Satish Dhawan Space Centre on Sriharikota Island. ISRO Launch: The ninth flight for the Geosynchronous Satellite […]<\/p>\n","protected":false},"author":1,"featured_media":30169,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":"","_links_to":"","_links_to_target":""},"categories":[2],"tags":[1259,525],"class_list":["post-39259","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","tag-gslv","tag-isro"],"acf":[],"_links":{"self":[{"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/posts\/39259"}],"collection":[{"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/comments?post=39259"}],"version-history":[{"count":0,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/posts\/39259\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/media\/30169"}],"wp:attachment":[{"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/media?parent=39259"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/categories?post=39259"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/tags?post=39259"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}