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HY 2A, 2B


HY 2 (Haiyang = Ocean) is a chinese series of Earth observation satellites focused on the marine dynamic environment.

The objective of the HY-2 satellites is to monitor the dynamic ocean environment with microwave sensors to detect sea surface wind field, sea surface height and sea surface temperature. The instrument suit consists of an altimeter (dual-frequency in Ku and C-bands), a scatterometer and a microwave imager.

HY 2A was launched by a CZ-4B launch vehicle from Taiyuan Satellite Launch Center in August 2011.

HY 2B followed on 24 October 2018 again on a CZ-4B launch vehicle from Taiyuan Satellite Launch Center.

Nation: China
Type / Application: Oceanography
Operator: CAST
Equipment: dual-frequency altimeter (Ku and C-bands), scatterometer, microwave imager
Power: Deployable solar array, batteries
Orbit: 882 km × 918 km, 99.4 (#2A); 929 km × 943 km × 99.35 (#2B)
Satellite COSPAR Date LS Launch Vehicle Remarks
HY 2A 2011-043A 15.08.2011 TY LC-9 CZ-4B
HY 2B 2018-081A 24.10.2018 TY LC-9 CZ-4B with Tangguo Guan


  • CAST Website

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