Tanyuan Pathfinder

Long March 2D carried four Chinese Academy of Sciences satellites that test payload technology for the Tanyuan (Origins) space science programme, among them the Hongmeng lunar-orbit radio array and Kuafu-2. Satellite A carries five instruments, including a magnetic field imager and a gamma-ray telescope pathfinder, and B, C and D fly in formation to test a distributed low-frequency interferometer.