Issue 65

Shijian-23 Releases Sub-Satellite

19 Jan 2023: Shijian-23, a Chinese experimental satellite operating in geostationary orbit (GEO), released a small object. SJ-23 was initially thought of as a likely follow-on to SJ-13, a communications satellite. However, the release of a sub-payload is more indicative of SJ-17, TJS-3 and SJ-21. Shijian-23 and its apparent subsatellite…

19 Jan 2023: Shijian-23, a Chinese experimental satellite operating in geostationary orbit (GEO),

released a small object. SJ-23 was initially thought of as a likely follow-on to SJ-13, a

communications satellite. However, the release of a sub-payload is more indicative of SJ-17,

TJS-3 and SJ-21. Shijian-23 and its apparent subsatellite could be conducting technology

verification tests.

– China launched SJ-23 (SCN 55131) to GEO on a Long March 7A rocket on 8 Jan. – Space Force's 18th Space Defense Squadron (18 SDS), which focuses on space domain awareness, tracked SJ-23 reaching geosynchronous orbit around 15 Jan and drifted toward its intended position in the GEO belt. – 18 SDS revealed SJ-23 released an object (SCN 55180) on 16 Jan, now labeled "SJ-23 AKM". -"AKM", or apogee kick motor, helps a satellite reach its destination orbit. However, it is possible the object is a subsatellite, possibly used together with the parent satellite for on-orbit testing. -The SJ-23 AKM is currently west of SJ-23, both drifting westward at roughly the same rate. – China's Shijian-21 satellite, launched in 2021, also reached GEO and released a satellite, which was then used for tests. Shijian-21 then proceeded to dock with the defunct Chinese navigation and positioning satellite Beidou-2 G2 and towed it to an orbit out of the way of active spacecraft in GEO. – In Jan 2019, China's TJS-3 also conducted maneuvers with its Apogee Kick Motor shortly after arriving in GEO. (Video) – In Nov 2016 Shijian-17 performed test maneuvers with its upper stage. SJ-17 later went on to conduct RPOs of other Chinese GEO satellites. (Video)

AKM SJ-23

Shijian-23 Releases Sub-Satellite

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