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HaiYang (Chinese: 海洋; "ocean"), abbreviated HY, is a series of marine remote sensing satellites developed and operated by China since 2002. As of September 2018[update], four satellites were launched and four more are planned.[1][2] The HaiYang series is operated by NSOAS (National Satellite Ocean Application Service), a subordinate agency of the State Oceanic Administration.


| Launch date | Satellites | Vehicle | Orbit | In use | Sensors |
|---|---|---|---|---|---|
| 2002-05-15 | HY-1A | CZ-4B | SSO | No | COCTS (Chinese Ocean Color and Temperature Scanner), CZI (Coastal Zone Imager) |
| 2007-04-11 | HY-1B | CZ-2C | SSO | Yes | COCTS (Chinese Ocean Color and Temperature Scanner), CZI (Coastal Zone Imager) |
| 2011-08-16 | HY-2A | CZ-4B | SSO | Yes | MWRI (Microwave Radiometer Imager), RA (Radar Altimeter), Ku-RFSCAT (Ku-Band Rotational Fan-beam Scatterometer) |
| 2018-09-06 | HY-1C | CZ-2C | SSO | Yes | Detection of chlorophyll, sediment concentrations and dissolved organic matter. Surface temperature measurements.[3] |