Sentinel-4
 | |||
| Manufacturer | Airbus Defence and Space | ||
|---|---|---|---|
| Country of origin |  European Union | ||
| Operator | EUMETSAT, ESA | ||
| Applications | Earth observation | ||
| Website | https://www.esa.int/Applications/Observing_the_Earth/Copernicus/Sentinel-4 | ||
| Specifications | |||
| Bus | Meteosat Third Generation-S, Luxor bus | ||
| Constellation | 1 | ||
| Launch mass | 3,600 kg (7,937 lb) | ||
| Dimensions | 2.280 × 2.760 × 5.170 m (7.5 × 9.1 × 17.0 ft) | ||
| Power | 2,000 W | ||
| Equipment | UVN imaging spectrometer | ||
| Design life | 8.5 years | ||
| Production | |||
| On order | 2 | ||
| Built | 1 | ||
| Launched | 1 | ||
| Maiden launch | 1 July 2025, 21:04 UTC | ||
| Last launch | ~2035 | ||
| Related spacecraft | |||
| Launch vehicle | Falcon 9 Block 5 | ||
| Configuration | |||
 Sentinel-4 on MTG-S
| |||
Sentinel-4 is a series of European Earth observation missions supporting the EU Copernicus Programme. It is the first project to monitor European air quality from geostationary orbit. Sentinel-4 focuses on monitoring of trace gas concentrations and aerosols in the atmosphere to support air-quality near-real time applications, air-quality monitoring, and climate monitoring – specifically with a short revisit period over Europe.
Sentinel-4s are not standalone satellites, but a type of instrument (ultraviolet, visible, and near-infrared imaging spectrometer) mounted on satellites of the MTG-S series of the Meteosat programme in a two-missions-one-satellite approach. The first Sentinel-4 mission (Sentinel-4A) launched in July 2025 aboard the MTG-S1 satellite on Falcon 9.