GSAT-19 is an ISRO communication satellite that tested high-throughput Ka/Ku-band transponders and several new spacecraft technologies. It was the first satellite launched by the GSLV Mk III, on 5 June 2017.
GSAT-19 carries Ka/Ku-band high-throughput communication transponders.
It also carries GRASP, a Geostationary Radiation Spectrometer that studies charged particles in space and how radiation affects satellites and their electronics.
The satellite weighed 3136 kg at launch and is built on ISRO's I-3K bus, with a mission life of 10 years.
It tested new technologies including a miniaturised heat pipe, a fibre-optic gyro, a MEMS accelerometer, a Ku-band telemetry and command transponder and an Indian-made lithium-ion battery.
GSLV Mk III-D1, the rocket's first developmental flight, lifted off from the Second Launch Pad at Sriharikota on 5 June 2017 and placed GSAT-19 in a geosynchronous transfer orbit.
The rocket has two S200 solid strap-on motors, an L110 liquid core stage and a C25 cryogenic upper stage.
The public satellite catalogue carries GSAT-19 with an operational flag in geostationary orbit.