Issue 137

Happy Holidays: China Launches SJ-29A and 29B to GEO

30 Dec 2025: China launched Long March-7A with the Shijian-29A and Shijian-29B satellites (67302 & 67303) from Wenchang. According to official sources, the satellites entered the preset orbit successfully and “will be mainly used for related new technology verification for space target detection”. Interestingly, they…

30 Dec 2025: China launched Long March-7A with the Shijian-29A and Shijian-29B satellites (67302 & 67303) from Wenchang. According to official sources, the satellites entered the preset orbit successfully and “will be mainly used for related new technology verification for space target detection”. Interestingly, they share a similar launch date and launch vehicle with the Shiyan-12 01/02 (50321 & 50322) satellites China launched on 23 Dec 2021, which also rode atop a Long March 7A. SY-12 A/B are frequently featured in the Flash as they continuously cruise the GEO belt. China has a tradition of launching “interesting” payloads near the end of the calendar year. Thanks, guys! Launch Video.

– After exiting GTO SJ-29A has settled into GEO at 73.0°E longitude with an inclination of 3.0°. SJ-29A currently has minimal drift from its current position.

-The Joint Commercial Operations cell (JCO) reported that there was a secondary object from this launch. That object has now been cataloged as SJ-29B. JCO reporting noted the SJ-29B was separating from SJ-29A about 7km per day on 10 Jan.

– JCO also reported the secondary object appeared stable and is ~2.5 visual magnitude dimmer than SJ-29A. Passive RF collection also suggests the separated object may be sending radio signals at a frequency of 2218MHz.


-The visual magnitude difference between SJ-29A and the secondary object suggests the vehicles are of different sizes and shapes. See image from the amazing s2asystems.
-The use of the LM-7A may indicate a similar mission as that of the Shiyan-12 01 and Shiyan-12 02 satellites China launched in late-2021. How China operates both satellites should reveal more of their mission.
China launched SY-12 01/02 into a different GEO location (~94.28°E) and inclination 0.5°. So the use of the same launch vehicle may be coincidental.
– As of 12 Jan SJ-29A and SJ-29B were separated 40-53km from one another. The vast majority of this separation is in-track which can be increased/decreased with minor maneuvers.


LM-7A Prepares to Launch
SJ-29A/B & Mission Patches.
SJ-29A/B On Orbit (nasaspaceflight.org) & s2asystems.com)






Launch & mission patches (above) (nasaspaceflight.com). Separation Distance Between SJ-29A & 29B Varies from 40-53km (saberastro.com)


SJ-29A & 29B Orbit Over the Indian Ocean (saberastro.com)