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29-hour countdown for launch of 'IRNSS-1H' begins

Bengaluru: The 29-hour countdown for Thursday's launch of navigation satellite 'IRNSS-1H' to augment the existing seven satellites of the NavIC constellation began on Wednesday. To be launched on board PSLV-C39, IRNSS-1H will be a 'back-up' navigation satellite for IRNSS-1A, one of the seven satellites in the constellation, as its three rubidium atomic clocks on board had stopped functioning.

"The 29-hr countdown operations of PSLV-C39/IRNSS-1H mission have started on Wednesday at 14:00 hrs IST," the Indian Space Research Organisation said.
The launch is scheduled at 19:00 Hrs from the Second Launch Pad of the Satish Dhawan Space Centre at Sriharikota in Andhra Pradesh.
The Mission Readiness Review (MRR) committee and Launch Authorisation Board (LAB) had on Tuesday cleared the 29-hour countdown.
The launch vehicle PSLV-C39 will use the 'XL' version of PSLV equipped with six strap-ons, each carrying 12 tons of propellant. The over 1,400 kg spacecraft was built and tested by ISRO along with a consortium of six small and medium industries. The Indian Regional Navigation Satellite System (IRNSS) is an independent regional navigation satellite system developed by India on par with US-based GPS.
The system that offers services like terrestrial and marine navigation, disaster management, vehicle tracking and fleet management, navigation aide for hikers and travellers, visual and voice navigation for drivers, was named 'NavIC' (Navigation with Indian Constellation) by Prime Minister Narendra Modi.

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