# GEO-KOMPSAT-2B
*missions*

## Specifications
- **operator**: kari
- **actual launch**: 2020-02-18
- **current status**: operational
- **orbit type**: Geostationary orbit, 35786 km altitude, 128.2 deg E longitude
- **swath km**: 2500
- **revisit days**: 1
- **tasking supported**: false
- **current geographic priority**: Korean Peninsula, Northeast Asian seas, and East/South Asia atmospheric-composition coverage
- **launch vehicle**: arianespace-ariane-5
- **entity type**: mission
- **last verified date**: 2026-06-14
- **verified by**: agency-doc
- **claim status**: agency-sourced
- **provider**: kari
- **attributes**: {"operator":"kari","actual_launch":"2020-02-18","current_status":"operational","orbit_type":"Geostationary orbit, 35786 km altitude, 128.2 deg E longitude","swath_km":2500,"revisit_days":1,"tasking_supported":false,"current_geographic_priority":"Korean Peninsula, Northeast Asian seas, and East/South Asia atmospheric-composition coverage","launch_vehicle":"arianespace-ariane-5"}
- **relevance**: in-scope

## Editorial
GEO-KOMPSAT-2B (GK-2B, Cheollian-2B) is a Korean geostationary satellite carrying ocean-colour and atmospheric-composition instruments, operated by the Korea Aerospace Research Institute at 128.2 degrees East and 35,786 km altitude.[^wmo-gk2b] Launched on 18 February 2020 in UTC, the mission is operational as of the WMO OSCAR record updated 2025-01-16.[^wmo-gk2b] The Geostationary Ocean Color Imager II (GOCI-II) provides 250 m resolution ocean-colour observations over a 2500 km local-area swath at hourly cadence during daylight hours, enabling coastal water quality monitoring, harmful algal bloom detection, and marine primary productivity assessment in Northeast Asian seas.[^nosc-goci-ii] The Geostationary Environment Monitoring Spectrometer (GEMS) observes tropospheric column NO2 and SO2 and related air-quality products across East and South Asia, covering long-range transport of air pollutants and industrial emissions at geostationary temporal resolution.[^nier-gems] The WMO OSCAR record gives launch on 2020-02-18 while the NIER Environmental Satellite Center describes GEMS aboard GK-2B as launched on 2020-02-19, consistent with the Korea local date.[^wmo-gk2b][^nier-gems]

## Compositional position
- GEO-KOMPSAT-2B --[mission_payloads]--> goci-ii (products)
- GEO-KOMPSAT-2B --[mission_payloads]--> gems (products)
- GEO-KOMPSAT-2B --[related-topic]--> coastal-water-quality (topics)
- GEO-KOMPSAT-2B --[related-topic]--> harmful-algal-bloom (topics)
- GEO-KOMPSAT-2B --[related-topic]--> marine-primary-production (topics)
- GEO-KOMPSAT-2B --[related-topic]--> air-quality (topics)

## Sources
- [wmo-gk2b] | WMO OSCAR satellite record: GEO-KOMPSAT-2B | https://space.oscar.wmo.int/satellites/view/geo_kompsat_2b | tier=agency-doc | accessed=2026-06-14
- [nosc-goci-ii] | National Ocean Satellite Center GK-2B GOCI-II overview | https://www.nosc.go.kr/eng/boardContents/actionBoardContentsCons0024.do%3Bjsessionid%3DFC9DCEB83F56A0C24AF6F51AD5D372B3.noscwasroute12 | tier=agency-doc | accessed=2026-06-14
- [nier-gems] | NIER Environmental Satellite Center GEMS introduction | https://nesc.nier.go.kr/en/html/cntnts/44/introduction/greeting.do | tier=agency-doc | accessed=2026-06-14

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Source: https://eo-atlas.org/missions/geo-kompsat-2b
Maintainer: SpectraWorks B.V. (CC-BY 4.0)