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The launch of IRSO’s eight navigation satellite IRNSS-1H onbaord of PSLV-C39 from Sriharikota, Andhra Pradesh was unsuccessful. The heat shield did not separate as a result of which satellite did not complete the 4th stage. The IRNSS-1H was being sent to space to back up and replace the functions of India’s first navigation satellite IRNSS-1A (launched in July 2013) as its three rubidium atomic clocks on board had stopped functioning. The rubidium atomic clocks on board of IRNSS-1A that stopped working were imported from European aerospace manufacturer Astrium. The atomic clocks are used to find satellite’s position with an accuracy of 0.5 metre.