ST-2 is a telecommunications satellite made by Mitsubishi Electric. It was launched on May 20, 2011, atop an Ariane 5 ECA rocket from ESA's Guiana Space Centre in a dual-launch mission with GSAT-8. ST-2 is a replacement for the ST-1 satellite. It is built around the DS2000 spacecraft bus. It is in geosynchronous orbit at 88 deg. East, and is operated by the ST-2 Satellite Ventures joint company of Singapore Telecommunications(SingTel) and Chunghwa Telecom. It provides relay services over the Middle East, Central Asia, India, and Southeast Asia.

GSAT-8 or INSAT-4G is a communication satellite. It was constructed by the Indian Space Research Organisation, as part of the INSAT system. GSAT-8 was launched on May 21, 2011, from Kourou, French Guiana. The rocket, an Ariane 5 was the carrier, marketed by Arianespace. The first satellite to carry GAGAN payload followed up by GSAT-10 and in-orbit spare GSAT-15.