GSAT-16 is an ISRO communication satellite with 48 transponders, launched by an Ariane 5 from Kourou in December 2014.
GSAT-16 carries 48 transponders: 24 in normal C band, 12 in upper extended C band and 12 in Ku band. When launched, that was the most transponders on any ISRO-built communication satellite. It keeps existing INSAT-GSAT services running and serves as a spare in orbit; it replaced INSAT-3E.
It weighed 3,181.6 kg at lift-off and measures 2.0 m × 1.77 m × 3.1 m. Solar arrays give 6,000 W, and two 180 ampere-hour lithium-ion batteries store power. It was designed for 12 years of work in orbit.
An Ariane 5 ECA rocket (flight VA-221) placed it in a geosynchronous transfer orbit from Kourou, French Guiana. The Master Control Facility at Hassan then fired its liquid apogee motor to reach geostationary-orbit. GSAT-16 sits at 55° East with GSAT-8, IRNSS-1A and IRNSS-1B.
The public satellite catalogue carries GSAT-16 with an operational flag.