IRNSS-1C is the third NavIC navigation satellite and the first placed in a geostationary slot, at 83° East. PSLV-C26 launched it in October 2014.
IRNSS-1C is the third of the seven satellites in the IRNSS (NavIC) space segment. IRNSS-1C carries two payloads. The navigation payload broadcasts NavIC signals in the L5 and S bands, timed by a rubidium atomic clock. The ranging payload is a C-band transponder that lets ground stations measure the satellite's distance precisely. Corner-cube retro-reflectors allow laser ranging. You can see the NavIC fleet's estimated positions on the NavIC tracker.
It weighed 1,425.4 kg at lift-off and follows the same design as IRNSS-1A and 1B. ISRO built it in less than six months after IRNSS-1B was launched. Two solar panels supply about 1,660 W. A 440 N liquid apogee motor and twelve 22 N thrusters move the satellite, while reaction wheels, magnetic torquers and thrusters keep it pointed, using Sun sensors, star sensors and gyroscopes. It was designed for a ten-year life.
PSLV-C26, the twenty-eighth PSLV flight, launched IRNSS-1C from the First Launch Pad at Sriharikota in October 2014, using the PSLV-XL version. Unlike 1A and 1B, it sits in a geostationary-orbit over the equator at 83° East.
The public satellite catalogue lists IRNSS-1C as degraded.