GSAT-12 was an Indian communication satellite with 12 extended C-band transponders, launched by a PSLV in July 2011. It served for more than a decade and was moved to a graveyard orbit above the geostationary belt in March 2023.
No longer operational, according to the public satellite catalogue.
GSAT-12 added 12 extended C-band transponders to the INSAT system. ISRO built it quickly to meet demand for capacity, for uses such as tele-education, telemedicine and Village Resource Centres.
It weighed 1,410 kg at launch, 559 kg of it dry mass, and its solar array gave 1,430 W. A 440 N liquid apogee motor did the orbit-raising.
PSLV-C17 launched it from the second launch pad at Sriharikota on 15 July 2011. This was only the second flight of the PSLV-XL, with longer strap-on boosters each holding 12 tonnes of propellant. The rocket left GSAT-12 in an elongated orbit below the usual transfer orbit, so the satellite made five engine burns (two at its low point, three at its high point) to reach geostationary height.
GSAT-12 sat at 83° E until March 2021. After its replacement, CMS-01, was launched in 2020, it was moved to 47.96° E.
In March 2023 the Master Control Facility at Hassan fired its thrusters seven times to lift it about 400 km above the 35,786 km geostationary height. The team then burned off the remaining fuel and switched off its wheels, batteries and transmitters. This was finished on 23 March 2023. ISRO says GSAT-12 was the 23rd Indian geostationary satellite to be retired this way.