GSLV Mark-III-D1 set for June 5 launch: Isro

In news:

 The 25-and-a-half hour countdown for the launch of the national space agency ISRO’s most powerful ever rocket GSLV Mark-III-D1 starts. The Launch Authorization Board and the Mission Readiness Committee of the ISRO have given permission for the launch.

The launch vehicle is set to place the nation’s 3136-kg communications satellite GSAT-19 in a Geo-synchronous Transfer Orbit after its lift off from the Satish Dhawan Space Centre, Sriharikotta on 5th June. This would be the first developmental flight of the heavy lift launch vehicle GSLV Mark-III that can carry 4-ton class satellites into the 36000 kilometer geostationary orbits.

The three stage launch vehicle is to be powered at the third stage of its ignition by the indigenous cryogenic upper stage, named as C25.


The success of the first full flight of Mk III will mean that soon, Indian communication satellites can be lofted into space from within the country. It will also improve ISRO’s ability to reach heavier satellites to both — the higher geostationary transfer orbit or GTO of 36,000 km; and to low-Earth orbit or LEO of up to 800 km.


GSAT-19 satellite with a lift-off mass of 3136 kg, is the communication satellite of India, configured around the ISRO’s standard I-3K bus.

GSAT-19 carries Ka/Ku-band high throughput communication transponders. Besides, it carries a Geostationary Radiation Spectrometer (GRASP) payload to monitor and study the nature of charged particles and the influence of space radiation on satellites and their electronic components. GSAT-19 also features certain advanced spacecraft technologies including miniaturised heat pipe, fibre optic gyro, Micro Electro-Mechanical Systems (MEMS) accelerometer, Ku-band TTC transponder, as well an indigenous Lithium-ion Battery.

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