ISRO to launch India's heaviest satellite using launch vehicle GSLV Mark III D-1 today

The countdown for the national space agency ISRO's historic launch of GSLV Mark III D-1 is progressing well at the Satish Dhawan Space Centre, Sriharikotta.The newly developed indigenous launch vehicle is set to insert the communication satellite GSAT-19 into a geosynchronous transfer orbit after it blasts off from the second launch pad of the spaceport at 5.28 pm today.

This is the first ever developmental flight for the 4-ton class vehicle, powered by the indigenous cryogenic upper stage of 20 tonnes thrust. In this test flight, the ISRO's most powerful ever rocket is set to carry the satellite of



3136 kg lift off mass into space, the heaviest ever to be launched from Indian soil.

GSLV Mark III has double the capacity of its predecessor GSLV Mark II in terms of its payload carrying capacity. Its first stage is made of two strap on motors filled with solid fuel.

The second and core stage is fueled by liquid propellants. The most crucial cryogenic engine at its upper stage provides a heavy thrust of 20 ton to give the mammoth rocket the edge to take heavier payloads such as 4-ton class communication satellites to geosynchronous transfer orbits.