Chang’e-4 is the fourth mission of the Chinese Lunar Exploration Program (CLEP). The specific scientific objectives of Chang’e-4 are, 1) moon-based low-frequency radio astronomical observations; 2) subsurface structure investigations along the cruise route; and 3) morphology and mineral composition surveys. Chang’e-4 consists of a communication relay satellite (Queqiao), a lander, and a rover (Yutu-2). Queqiao was launched on May 21st, 2018, and then entered the Halo orbit around the Earth-Moon L2 point. Chang’e-4 successfully landed at 177.5991 ° E, 45.4446 °S within Von Kármán crater in the South-Pole Aitken basin on January 3rd, 2019, becoming the first mission soft landing on the farside of the Moon.
The scientific payloads onboard Chang’e-4 are partially inherited from its precedent Chang’e-3, and partially supplied by the international partners including Sweden, Germany, and the Netherlands. Specifically, the lander is equipped with Terrain Camera (TCAM), Landing Camera (LCAM), Low-frequency Radio Spectrometer (LFRS), and Lunar Lander Neutrons and Dosimetry (LND); the rover is equipped with Panoramic Camera (PCAM), Lunar Penetrating Radar (LPR), Visible and Near-infrared Imaging Spectrometer (VNIS), and Advanced Small Analyzer for Neutrals (ASAN); the communication relay satellite is equipped with Netherlands-China Low-Frequency Explorer (NCLE).