| 词条 | PSLV-C39 |
| 释义 |
| name = PSLV-C39 | names_list = | image = | image_caption = | image_alt = | image_size = | mission_type = Deployment of IRNSS-1H into sub-GTO | operator =ISRO | website = ISRO website | mission_duration = | spacecraft = Polar Satellite Launch Vehicle | spacecraft_type = Expendable launch vehicle | spacecraft_bus = | manufacturer =ISRO | launch_mass = 321 t | payload_mass = 1425 kg | dimensions = | crew_size = Unmanned | launch_date = {{start date|df=yes|2017|08|31|19|00|00|7=IST}} (IST) | launch_rocket = Polar Satellite Launch Vehicle | launch_site = Sriharikota Launching Range | launch_contractor =ISRO | payload_items ={{Collapsible list |framestyle=border:none; padding:0; |title=List of Satellites : | {{Flagicon|India}} IRNSS-1H | cargo_mass = | programme = Polar Satellite Launch Vehicle missions | previous_mission = PSLV-C38 | next_mission = PSLV-C40 }}Polar Satellite Launch Vehicle – C39 was the forty-first flight of the PSLV series of launch vehicles on 31 August 2017. Launched in its XL configuration, the vehicle suffered a rare failure – the first failure after 24 years of operations[1] when the heat shield failed to separate and the payload became trapped inside the heat shield and could not be deployed.[2] The missionPSLV-C39 was supposed to launch the IRNSS-1H, the eighth satellite of the Indian Regional Navigation Satellite System (IRNSS). The launch was necessitated due to the failure of all the Cesium atomic clocks in one of the satellites of the constellation which rendered the navigation system non-operational.[2] The rocket successfully lifted off from the launch pad and performed as expected for about 3 minutes, when the heat shield protecting the satellite during its ascent through the atmosphere was supposed to separate. Due to a malfunction of the pyro devices designed to explosively separate the heat shield,[3] the satellite remained within the heat shield.[1] The satellite stuck within the heat shield with a combined weight of around {{convert|2400|kg|lb}} was expected to re-enter and burn up in the earth's atmosphere in 40 – 60 days[4][5] {{clear}}References1. ^1 {{cite web|title=ISRO launch ‘unsuccessful’|url=https://www.hindustantimes.com/science/isro-launch-unsuccessful-what-is-heat-shield-and-why-was-irnss-1h-satellite-not-released/story-hQ81GxorxtCvv7vYe9qyML.html|website=Hindustan Times|accessdate=9 February 2018|archiveurl=https://web.archive.org/web/20180209063714/https://www.hindustantimes.com/science/isro-launch-unsuccessful-what-is-heat-shield-and-why-was-irnss-1h-satellite-not-released/story-hQ81GxorxtCvv7vYe9qyML.html|archivedate=9 February 2018|location=Wayback Machine}} 2. ^{{cite web|author1=Johnson TA|title=ISRO readies replacement satellite after clock failure|url=http://indianexpress.com/article/technology/science/isro-irnss-1h-readies-replacement-satellite-irnss-1h-after-clock-failure-4818259/|website=The Indian Express|accessdate=9 February 2018|archiveurl=https://web.archive.org/web/20180209064703/http://indianexpress.com/article/technology/science/isro-irnss-1h-readies-replacement-satellite-irnss-1h-after-clock-failure-4818259/|archivedate=9 February 2018|location=Wayback Machine}} 3. ^{{cite web|author1=U Tejonmayam|title=Why PSLV-C39 failed|url=https://timesofindia.indiatimes.com/city/chennai/why-pslv-c39-failed-an-explosion-that-didnt-happen/articleshow/62493045.cms|website=Times of India|accessdate=9 February 2018|archiveurl=https://www.webcitation.org/6x63CIyHY|archivedate=9 February 2018|location=WebCite}} 4. ^{{cite web|title=IRNSS-1H satellite and PSLV heat shield to re-enter Earth's atmosphere in 40-60 days|url=http://www.firstpost.com/tech/news-analysis/irnss-1h-satellite-and-pslv-heat-shield-to-re-enter-earths-atmosphere-in-40-60-days-4010357.html|website=Firstpost}} 5. ^1 {{cite web|title=What went wrong in PSLV-C39 launch?|url=http://www.thehindu.com/sci-tech/technology/what-went-wrong-in-pslv-c39-launch-isro-to-probe/article19604368.ece|website=The Hindu|accessdate=9 February 2018|archiveurl=https://web.archive.org/web/20180209072427/http://www.thehindu.com/sci-tech/technology/what-went-wrong-in-pslv-c39-launch-isro-to-probe/article19604368.ece|archivedate=9 February 2018|location=Wayback Machine}} External links
4 : Polar Satellite Launch Vehicle|Spacecraft launched by India in 2017|August 2017 events in India|Satellite launch failures |
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