Tianwen-2 Asteroid Probe Mission Enters Final Development Phase
Summary: CASC announced on July 26, 2026, that the Tianwen-2 near-Earth asteroid sample return and main belt comet probe mission has officially entered the final development phase with key technology breakthroughs.
According to an announcement released by the China Aerospace Science and Technology Corporation (CASC) on July 26, 2026, the Tianwen-2 probe mission has officially transitioned from its preliminary design phase to the final development phase. The mission carries two major scientific objectives: collecting samples from a near-Earth asteroid and returning them to Earth, and conducting deep-space exploration of a main belt comet. The transition to the final development phase signals that critical technology verification work has been largely completed, pushing the program into its final engineering sprint.
Tianwen-2 is a key component of China's planetary exploration program. Based on previously available public information, the mission's target asteroid is the near-Earth asteroid 469219 (designation to be confirmed by the relevant authority). The probe will perform close-range observation and landing operations to collect surface samples, which will then be sealed and dispatched back to Earth. After completing the sample return, the spacecraft will use an Earth gravity assist to continue its journey toward a main belt comet for an extended scientific investigation.
Regarding key technology breakthroughs, CMSE reported that the advancement to the final development phase was enabled by successful攻关 of multiple core technologies, including the sampling mechanism, high-speed reentry and return capsule design, and deep-space communication systems. During the preliminary phase, Tianwen-2 reportedly completed a series of ground verification tests, including simulated sampling operations under asteroid-like low-gravity conditions (as reported). Specific technical details are expected to be disclosed by CASC at a later date.
According to the publicly available mission timeline, Tianwen-2 is planned for launch aboard a Long March series launch vehicle around 2025 (exact launch window to be confirmed by the relevant authority). The full mission duration is expected to span approximately ten years, encompassing asteroid approach, sample collection and return, and comet exploration phases. The transition to the final development phase means that all subsystems will now proceed to final production and integrated testing.