China Plans Space-Ground Asteroid Warning Network as 55% of 140-Meter Threats Remain Undetected
Updated
Updated · Space.com · Jul 9
China Plans Space-Ground Asteroid Warning Network as 55% of 140-Meter Threats Remain Undetected
3 articles · Updated · Space.com · Jul 9
Summary
June 30 marked China’s announcement that it will build a coordinated ground-and-space network to detect near-Earth asteroids, with officials calling it the core of a broader planetary defense system.
45% of known 140-meter-class asteroids have been detected so far, versus more than 95% of objects at least 1 kilometer wide, leaving a major gap in tracking bodies large enough to devastate a small country.
Recent Chinese papers and a 2025 U.N. presentation suggest a basic design centered on one satellite at Sun-Earth L1—about 1.5 million kilometers from Earth—paired with northern and southern ground stations.
An extended model under study adds spacecraft in Earth-leading or trailing, Venus-like, and distant retrograde orbits to better spot sunward threats that ground telescopes can miss, as in the 2013 Chelyabinsk event.
China’s 15th Five-Year Plan already lists an asteroid defense project under study, and researchers say any new telescopes or radar would strengthen global monitoring if Beijing shares data internationally.
Arecibo's collapse left Earth partially blind to asteroids. Can China's new network restore our vision in time?
With rival asteroid-hunting missions converging at the same point in space, will it lead to collaboration or global conflict?
Can a technology designed to save the world by moving asteroids also be weaponized to threaten it?
China's 2027 Asteroid Impact Mission and the Rise of Integrated Planetary Defense Systems
Overview
China is rapidly advancing its planetary defense efforts, highlighted by a planned dual-spacecraft kinetic impact mission targeting the near-Earth asteroid 2015 XF261. Scheduled for launch in 2027 using a Long March 3B rocket, the mission will send both an impactor and an observer spacecraft, with the impact expected in April 2029. This initiative follows a shift from an earlier target and demonstrates China’s commitment to developing advanced monitoring and early-warning systems. By integrating ground-based radar, optical telescopes, and space-based sensors, China aims to strengthen global asteroid detection and contribute to international planetary defense collaboration.