China launched a pair of satellites called Shiyan-12-01 and Shiyan-12-02 on board a Chang Zheng 7A rocket at 10:12 UTC. The pair of satellites launched to a geostationary transfer orbit (GTO) from the Wenchang Space Launch Center in China.
The purpose of the satellites is spatial environment detection and testing. Each of them has a weight of 3 tons. The development was executed by the China Association for Science and Technology (CAST), which has developed other payloads of this kind before, including the Shiyan-9 and Shiyan-11 payloads.