# HY-1C Satellite Calibration Spectrometer
*sensor . products*

Calibration spectrometer payload flown on HY-1C for ocean-colour instrument support.

## Specifications
- **product status**: operational
- **deployment context**: orbital
- **manufacturer**: cast
- **sensor**: {"instrument_family":"passive-optical","measurement_principle":"passive","spec_disclosure":"undisclosed"}
- **entity type**: sensor
- **last verified date**: 2026-06-16
- **verified by**: agency-doc
- **claim status**: agency-sourced
- **provider**: cast
- **attributes**: {"kind":"sensor","product_status":"operational","deployment_context":"orbital","manufacturer":"cast","description":"Calibration spectrometer payload flown on HY-1C for ocean-colour instrument support.","sensor":"{\"instrument_family\":\"passive-optical\",\"measurement_principle\":\"passive\",\"spec_disclosure\":\"undisclosed\"}"}
- **relevance**: in-scope

## Editorial
The HY-1C Satellite Calibration Spectrometer is a passive optical calibration imaging spectrometer carried on HY-1C.[^wmo-hy1c][^song-2022-scs] Its role is onboard synchronous and cross-calibration support for HY-1C optical instruments, demonstrated through cross-sensor harmonization on the HY-1C mission.[^nsoas-hy1c][^wmo-hy1c][^song-2022-scs] The instrument uses two independent ultraviolet spectral channels and one visible/NIR spectral channel, with a recorded 400-900 nm spectral range and 5 nm spectral resolution.[^song-2022-scs] Ground sampling is 1.1 km at nadir and the swath is 12 km from a +/-0.5 deg field of view.[^song-2022-scs] A one-dimensional pointing mechanism supports +/-30 deg side-swing for cross-calibration viewing geometry.[^song-2022-scs] WMO lists HY-1C as operational, with end-of-life at least 2026 in its 2026-01-19 update.[^wmo-hy1c] For buyers, SCS is a calibration-support sensor rather than a broad-swath ocean-colour imager: its value is traceability and cross-calibration geometry for optical-instrument product chains.

## Compositional position
- hy-1c (missions) --[mission_payloads]--> HY-1C Satellite Calibration Spectrometer

## Sources
- [nsoas-hy1c] | HY-1C mission page, National Satellite Ocean Application Service | https://www.nsoas.org.cn/eng/item/238.html | tier=agency-doc | accessed=2026-06-16
- [wmo-hy1c] | WMO OSCAR satellite record: HY-1C | https://space.oscar.wmo.int/satellites/view/hy_1c | tier=agency-doc | accessed=2026-06-16
- [song-2022-scs] | Time Series Analysis-Based Long-Term Onboard Radiometric Calibration Coefficient Correction and Validation for the HY-1C Satellite Calibration Spectrometer | https://www.mdpi.com/2072-4292/14/19/4811 | tier=peer-reviewed | accessed=2026-06-16 | published=2022-09-27

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