Recently, ISO 21740:2025, Space systems—Launch window estimation and collision avoidance, and ISO 16615:2025, Space systems—Stable operation requirements for spacecraft attitude and orbit control system, were officially published.

ISO 21740:2025 was jointly proposed by experts from China, the U.S., France and Japan. It establishes the general safety launch collision avoidance (safety LCOLA) requirements for the avoidance of collision between the collection of newly launched objects resulting from a space launch (including launch vehicle stages and payloads or released objects) and human-inhabited or human-habitable space stations and space vehicles. It can specify requirements for the analysis of launch times and procedures for identifying safe launch opportunities.

ISO 16615:2025 provides the criteria for stable on-orbit operation of the spacecraft’s attitude and orbit control system (AOCS). It addresses factors affecting the spacecraft’s on-orbit stability by specifying principles and requirements for establishing the spacecraft AOCS’s capability for stable on-orbit operation.

As of now, 30 ISO standards in the field of aerospace have been released with the leading efforts of China. As a responsible major country, China vigorously participates in outer space governance, supports rule-making activities in this field, and promotes the building of a community with a shared future.