# HY-1D
*missions*

## Specifications
- **operator**: nsoas
- **actual launch**: 2020-06-11
- **current status**: operational
- **orbit type**: Sun-synchronous orbit, approximately 798 km altitude, 13:30 ascending equator crossing
- **current geographic priority**: Global ocean and coastal-zone observations
- **tasking supported**: false
- **launch vehicle**: casc-long-march-2c
- **entity type**: mission
- **last verified date**: 2026-06-14
- **verified by**: agency-doc
- **claim status**: agency-sourced
- **provider**: nsoas
- **attributes**: {"operator":"nsoas","actual_launch":"2020-06-11","current_status":"operational","orbit_type":"Sun-synchronous orbit, approximately 798 km altitude, 13:30 ascending equator crossing","current_geographic_priority":"Global ocean and coastal-zone observations","tasking_supported":false,"launch_vehicle":"casc-long-march-2c"}

## Editorial
HY-1D (Hai Yang 1D) is the fourth HY-1 series ocean observation satellite operated by NSOAS. It was launched on 2020-06-11 from Taiyuan (NSOAS operator report; WMO OSCAR records 2020-06-10 UTC). HY-1D flies in a sun-synchronous orbit at approximately 798 km altitude with a 13:30 ascending equator crossing. WMO OSCAR records HY-1D as operational as of its last update.[^wmo-oscar-hy1d][^nsoas-hy1d-launch]

HY-1D carries five payloads: the Chinese Ocean Colour and Temperature Scanner (COCTS) for ocean colour and sea-surface temperature; the Coastal Zone Imager (CZI) for high-resolution coastal observation; the Ultraviolet Imager (UVI) for atmospheric correction support; a Spectral Calibration Spectrometer (SCS) for on-orbit spectral calibration; and an Automatic Identification System (AIS) receiver for vessel tracking.[^nsoas-hy1d-launch]

Data are distributed by NSOAS and support global ocean colour, sea-surface temperature, coastal zone monitoring, and maritime domain awareness.[^wmo-oscar-hy1d]

## Compositional position
- HY-1D --[mission_payloads]--> cocts (products)
- HY-1D --[mission_payloads]--> czi (products)
- HY-1D --[mission_payloads]--> hy-uvi (products)
- HY-1D --[mission_payloads]--> hy-scs (products)
- HY-1D --[mission_payloads]--> ais-hy-1d (products)

## Sources
- [nsoas-hy1d-launch] | A new development journey of Ocean colour Satellites | https://www.nsoas.org.cn/eng/item/258.html | tier=operator-press | accessed=2026-06-14
- [wmo-oscar-hy1d] | WMO OSCAR satellite record: HY-1D | https://space.oscar.wmo.int/satellites/view/hy_1d | tier=community | accessed=2026-06-14

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Source: https://eo-atlas.org/missions/hy-1d
Maintainer: SpectraWorks B.V. (CC-BY 4.0)