Shijian 31

Success CASC, Long March 3B/E

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Mission

Government/Top Secret · Elliptical

Classified experimental Chinese satellite of unknown purposes (officially described for "spatial environment detection" purposes).

What it put in orbit

ObjectTypeOrbit
SHIJIAN-31 (SJ-31) 2026-136A Payload 1993 × 39896 km · 63.5° Globe
CZ-3B R/B 2026-136B Rocket body re-entered 2026-09-27

COSPAR ID 2026-136 (data from GCAT, J. McDowell, CC BY 4.0). Orbits from the CelesTrak satellite catalogue (perigee × apogee, inclination).

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