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SJ 2B (Shi Jian 2B) was a passive radar calibration satellite.

The SJ-2B payload consisted of a 4 m diameter balloon satellite, which was tethered by a 600 m long silk tether to a 45 cm metal sphere.

SJ 2B was launched as one of three payloads on a FB-1 rocket in September 1981. An earlier launch failure in July 1979 reportedly carried the same payloads.

Nation: China
Type / Application: Technology
Configuration: Balloon tethered to sphere
Propulsion: None
Power: None
Mass: 28 kg
Orbit: 232 km × 1608 km, 59.4
Satellite COSPAR Date LS Launch Vehicle Remarks
SJ (2B) 1979-F02 27.07.1979 Jq LC-2/138 F FB-1 with SJ (2), SJ (2A)
SJ 2B 1981-093A 19.09.1981 Jq LC-2/138 FB-1 with SJ 2, SJ 2A


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