GSAT-10 is a 3,400 kg ISRO communication satellite with 30 transponders and a GAGAN navigation payload. An Ariane 5 launched it from Kourou in September 2012.
GSAT-10 adds capacity to India's INSAT system with 30 transponders: 12 in the Ku band, 12 in normal C band and 6 in lower extended C band. A Ku-band beacon helps ground antennas point at it.
It also carries a two-channel GAGAN payload in the L1 and L5 bands. GAGAN improves GPS positions with corrections from ground receivers, accurate enough for civil aviation over Indian airspace. GSAT-10 was the second satellite to carry GAGAN, after GSAT-8.
It weighed 3,400 kg at lift-off, of which 1,498 kg was dry mass. Solar arrays give 6,474 W, and two 128 ampere-hour lithium-ion batteries store power. A 440 N liquid apogee motor did the orbit-raising, and the satellite was designed for a 15-year life.
An Ariane 5 ECA rocket (flight VA-209) launched it from Kourou, French Guiana, in September 2012. GSAT-10 sits in geostationary-orbit at 83° East, sharing that slot with INSAT-4A and GSAT-12.
The public satellite catalogue carries GSAT-10 with an operational flag.