Issue 132

China Launches Shiyan-31

13 Oct 2025: China launched a Long March-2D with the Shiyan-31 (65945) satellite from Jiuquan. According to official sources, the satellite entered the preset orbit successfully and “will be mainly used to verify new optical imaging technologies”. The launch was unusual in that China did not release advance notice to…

13 Oct 2025: China launched a Long March-2D with the Shiyan-31 (65945) satellite from Jiuquan. According to official sources, the satellite entered the preset orbit successfully and “will be mainly used to verify new optical imaging technologies”. The launch was unusual in that China did not release advance notice to airmen (NOTAMs) as is their normal procedure. Launch Video. Watch LM-2D first stage bomb China.

– China launched SY-31 into an 80° inclined orbit with an apogee of 510.5km and a perigee of 494.7kms. This is not a sun-synchronous orbit typically used for optical imaging satellites.

  • Typical Sun-synchronous orbits around Earth are about 600–800 km in altitude and inclinations of around 98°.

– SY-31 is in a unique orbit for Chinese imagery satellites. I could find no other imaging satellites with an 80° inclination. For example the Gaofen-11 satellites (believed to be high resolution optical earth observation satellites) are inclined 97.5° with a lower average altitude of 490-495km.

– China has launched a significant number of Shiyan satellites in 2025. With the SY-31 launch they surpassed their 2022 satellite total. Here is the Shiyan launch history going back to 2021:

  • 2021: 5 launches / 6 satellites
  • 2022: 7 launches / 11 satellites
  • 2023: 4 launches / 7 satellites
  • 2024: 2 launches / 4 satellites
  • 2025*: 5 launches / 12 satellites (through Oct)

-Per Andrew Jones: “outside analysts believe Shiyan satellites are used to trial new systems such as sensors, communications subsystems and environmental instruments, forming part of China’s efforts to validate new space technologies in orbit.”