Close Approach of TIANHUI Satellites Highlights Conjunction Risks
On 4 May 2026, at 12:08 UTC, two Chinese Earth observation satellites, TIANHUI 2-01A (NORAD ID: 44207) and TIANHUI 2-01B (NORAD ID: 44209), experienced a close approach in orbit. The satellites passed within approximately 1.94 kilometres of each other. Such conjunctions, where two space objects come within a few kilometres, are monitored closely to prevent potential collisions.
Conjunctions are becoming more frequent as the number of satellites in orbit increases. The TIANHUI satellites operate in low Earth orbit (LEO), a region that is particularly congested. Conjunctions pose risks not only to the satellites involved but also to other spacecraft in the vicinity. Operators use predictive tools and models to assess collision risks and plan avoidance manoeuvres if necessary.
Satellite operators rely on data from organisations like the United States Space Surveillance Network (SSN) to track objects in space. When a potential conjunction is identified, operators may perform collision avoidance manoeuvres, adjusting a satellite's orbit to ensure a safe distance. Orbital Radar's debris map provides a visual representation of space debris and active satellites, assisting in conjunction analysis.
As satellite constellations expand, the importance of robust conjunction management systems grows. Enhanced tracking capabilities and international coordination are critical to maintaining space safety. The Orbital Radar anomaly panel can be used to track unexpected satellite behaviour, providing additional data for conjunction assessments. Future developments in space traffic management will likely focus on improving prediction accuracy and response strategies.
