Chinese University-Led Mission to Study Asteroid Apophis During Close Encounter with Earth

Why It Matters

START proves that low‑cost, university‑run missions can deliver valuable deep‑space data, bolstering planetary‑defense research and showcasing China’s expanding role in asteroid exploration.

Key Takeaways

• START aims to pass within 7 km of 340‑m Apophis.
• 200‑kg spacecraft uses xenon solar electric propulsion to raise orbit.
• Mission budget totals about $2.8 million, funded by university and sponsors.
• Complements Japan’s DESTINY+, ESA’s RAMSES, and NASA’s OSIRIS‑APEx.
• Provides 8 cm/pixel imaging to study tidal surface changes.

Pulse Analysis

Apophis will swing within 32,000 km of Earth on 13 April 2029, closer than geostationary satellites. This rare geometry offers a natural laboratory for studying tidal forces, surface evolution, and testing deflection concepts. International interest has surged, with Japan’s DESTINY+, ESA’s RAMSES, and NASA’s OSIRIS‑APEx each planning flybys or rendezvous. The convergence of four missions creates an unprecedented data set, allowing scientists to compare observations from different instruments and trajectories, sharpening models that underpin planetary‑defense strategies.

The Student‑led Threatening Asteroid Reconnaissance of Tsinghua (START) distinguishes itself by its modest scale and budget. A 200‑kg smallsat, built by more than 20 undergraduates, will launch as a free rideshare on a Zhuque‑3 rocket in early 2028. After a 1,000‑km insertion orbit, a xenon solar electric propulsion system will lift the craft to 31,600 km over 200 days, positioning it for a 7‑km flyby at 8.74 km/s. Its payload—narrow‑ and wide‑field cameras plus dual VIS‑NIR hyperspectral imagers—targets 8 cm/pixel resolution, enough to resolve individual boulders and monitor surface shifts during peak tidal stress.

START’s $2.8 million cost demonstrates that meaningful deep‑space science can be achieved without flagship spending, signaling a shift toward university‑driven, low‑cost missions. China’s broader ambition, including an upcoming asteroid‑deflection test and the Tianwen‑2 NEA mission, positions it as a serious player in planetary‑defense research. By filling a niche timing window, START not only enriches the global Apophis data pool but also provides a training ground for the next generation of Chinese aerospace engineers. The mission’s success could inspire similar collaborations worldwide, accelerating affordable access to deep‑space exploration.