# HY-1C
*missions*

## Specifications
- **operator**: nsoas
- **actual launch**: 2018-09-07
- **current status**: operational
- **orbit type**: Sun-synchronous orbit, 785 km altitude, 10:30 descending equator crossing
- **revisit days**: 7
- **tasking supported**: false
- **current geographic priority**: Global ocean colour, sea-surface temperature and coastal-zone observations
- **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":"2018-09-07","current_status":"operational","orbit_type":"Sun-synchronous orbit, 785 km altitude, 10:30 descending equator crossing","revisit_days":7,"tasking_supported":false,"current_geographic_priority":"Global ocean colour, sea-surface temperature and coastal-zone observations","launch_vehicle":"casc-long-march-2c"}
- **relevance**: in-scope

## Editorial
HY-1C (Hai Yang 1C) is the third HY-1 series ocean observation satellite operated by NSOAS, and the first operational unit of the HY-1C/HY-1D generation. It was launched on 2018-09-07 and flies in a sun-synchronous orbit at 785 km altitude with a 10:30 descending equator crossing and a 7-day repeat cycle. WMO OSCAR records it as operational as of 2026-01-19.[^wmo-oscar-hy1c]

HY-1C carries five payloads. The Chinese Ocean Colour and Temperature Scanner (COCTS) provides 10-band multispectral imagery for ocean colour and sea-surface temperature retrieval; WMO and IOCCG report COCTS swath as 2,900 km and 3,000 km respectively.[^wmo-oscar-hy1c][^ioccg-hy1] The Coastal Zone Imager (CZI) delivers higher-resolution four-band imagery for nearshore and land-coastal boundary observation.[^ceos-hy1c] The Ultraviolet Imager (UVI) appears in the WMO OSCAR instrument set as an active payload on HY-1C.[^wmo-oscar-hy1c] An Automatic Identification System (AIS) receiver provides vessel tracking capability, and a Spectral Calibration Spectrometer (SCS) supports on-orbit calibration.[^wmo-oscar-hy1c]

NSOAS operates the satellite and distributes data supporting ocean colour, sea-surface temperature, and coastal zone monitoring applications.[^wmo-oscar-hy1c]

## Compositional position
- HY-1C --[mission_payloads]--> cocts (products)
- HY-1C --[mission_payloads]--> czi (products)
- HY-1C --[mission_payloads]--> hy-uvi (products)
- HY-1C --[mission_payloads]--> hy-1c-scs (products)
- HY-1C --[mission_payloads]--> ais-hy-1c (products)
- HY-1C --[related-topic]--> coastal-water-quality (topics)
- HY-1C --[related-topic]--> marine-primary-production (topics)
- HY-1C --[related-topic]--> sea-surface-temperature (topics)
- HY-1C --[related-topic]--> vessel-tracking (topics)

## Sources
- [wmo-oscar-hy1c] | WMO OSCAR satellite record: HY-1C | https://space.oscar.wmo.int/satellites/view/hy_1c | tier=community | accessed=2026-06-14
- [ceos-hy1c] | CEOS MIM mission summary: HY-1C | https://database.eohandbook.com/database/missionsummary.aspx?missionID=826 | tier=community | accessed=2026-06-14
- [ioccg-hy1] | IOCCG sensor summary: COCTS and CZI on HY-1 series | https://ioccg.org/sensor/cocts-and-czi-on-hy-1b-2/ | tier=community | accessed=2026-06-14

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