China Launches Yaogan-40 Group 04 Earth-Observation Satellites
China successfully launched the Yaogan-40 Group 04 satellites from the Taiyuan Satellite Launch Center in Shanxi Province at 4:46 p.m. Beijing time on September 24, lofting the payload into its planned orbit aboard a Long March 6A carrier rocket and declaring the mission a complete success, according to Xinhua. The flight marked the 670th launch of the Long March rocket family, underscoring the accelerating pace of China’s space program.
A Remote-Sensing Mission
The Yaogan-40 Group 04 satellites are primarily designed to carry out electromagnetic environment detection and related technology experiments, Xinhua reported. The satellites were developed under the overall leadership of the 5th Academy of the China Aerospace Science and Technology Corporation (CASC), the state-owned enterprise that leads the country’s launch and satellite programs, per Science and Technology Daily.
The Yaogan series is a broad family of Chinese remote-sensing and Earth-observation satellites. Chinese official reporting consistently describes the Yaogan-40 sub-series as intended for electromagnetic environment detection and related technology experiments — a mission profile that analysts outside China have associated with signals and electronic intelligence collection.
The Long March 6A Rocket
The launch vehicle, the Long March 6A, is a new-generation solid-liquid bundled medium-lift rocket developed under the overall leadership of the 8th Academy of CASC, Science and Technology Daily reported. It features solid boosters attached to a liquid-core stage and has a sun-synchronous orbit (SSO) capacity of no less than 6.5 tons. The rocket first flew in 2022.
A Rapidly Rising Launch Cadence
The 670th flight milestone reflects a striking acceleration in Chinese launch activity. The Long March family’s 655th flight occurred around July 4, 2026 — meaning roughly 15 Long March launches took place in under three months. Earlier launches in the Yaogan-40 series followed a similar pattern: Group 02 lifted off from Taiyuan on May 11, 2025, and Group 03 followed on September 7, 2025, both aboard Long March 6A rockets and both with the same stated mission purpose. The Group 02 launch was reported at the time by Chinese state media.
The numbered “Group” naming of Yaogan-40 satellites indicates successive batches building out a constellation and operational capability over time.
Why It Matters
The Yaogan-40 Group 04 launch fits into a broader expansion of China’s space infrastructure, spanning Earth observation, communications, navigation, and scientific research. The regularity of the Yaogan-40 launches — with Group 02, 03, and now 04 appearing at intervals across 2025 and 2026 — suggests a steady, incremental deployment rather than a one-off demonstration.
For Beijing, these missions serve dual purposes: strengthening civilian remote-sensing and environmental-monitoring capacity while also advancing capabilities that can support national security interests. The dual-use nature of the Yaogan series is a key reason the program draws close attention from international observers.
What to Watch
The immediate milestone — a flawless launch and successful orbital insertion — is confirmed. What remains to be seen is how quickly China continues to expand the Yaogan-40 constellation and whether the launch cadence keeps climbing. Consistently high flight rates of the Long March series suggest the country is on track to sustain one of the world’s busiest launch schedules.
Note: All primary reporting on this event originates from Chinese state or state-affiliated media, which published a consistent account of the launch time, site, vehicle, payload, and stated mission purpose. No independent corroboration of technical specifics beyond the official narrative was available at the time of publication.