ESA Launches FLEX and Sentinel-3C Satellites Successfully

On September 15, 2026, the European Space Agency (ESA) confirmed a successful launch of two important Earth observation satellites, the FLEX (Fluorescence Explorer) and the Copernicus Sentinel-3C. The launch took place at 03:21 CEST from Europe’s Spaceport in French Guiana. Both satellites have acquired signals and are confirmed to be in healthy orbits. FLEX will focus on monitoring the health of Earth's vegetation, while Sentinel-3C will work alongside its predecessors to provide comprehensive data regarding oceans, land, ice, and atmospheric conditions. This effort further supports the objectives of the Copernicus Programme, which is a crucial part of the European Union's Earth observation initiatives.

The FLEX satellite is an Earth Explorer mission that forms part of ESA’s initiative to deploy small scientific satellites aimed at studying various environmental aspects. FLEX is designed to measure the faint fluorescence emitted by plants during photosynthesis. This signal, not visible to the naked eye, can be captured from space. Such capability allows the satellite to assess plant health and stress levels, providing vital information for understanding the interactions between vegetation and atmospheric conditions. The satellite will produce global maps of vegetation fluorescence with a resolution of 300 m × 300 m, aiding in the study of ecosystem dynamics.

Sentinel-3C is the third satellite in the Sentinel-3 series, which has been operational since the first satellite’s launch a decade ago. The data from this mission has been instrumental in providing essential datasets for both scientific research and operational applications. This new satellite will carry four advanced scientific instruments that can rapidly collect data across vast regions, ensuring continuity and enhancing the understanding of climate change impacts. The operational management of the Sentinel-3 series is a collaborative effort between ESA and Eumetsat on behalf of the European Commission.

The Vega-C rocket, which successfully deployed both satellites, stands at 35 meters tall and can lift payloads of up to 2300 kilograms into space. The Vega-C program, led by ESA in partnership with Avio, aims to ensure that Europe maintains versatile and independent access to space. This launch, known as flight VV30, marks another step in the evolution of European space capabilities, complementing the Ariane family of launch vehicles.

Looking ahead, the successful deployment of FLEX and Sentinel-3C is expected to significantly enhance global monitoring of environmental changes. These satellites will provide critical data necessary for informing climate policy and managing natural resources. As they begin their missions, they will contribute to a deeper understanding of climate dynamics and support the efforts of scientists and researchers worldwide in addressing pressing environmental challenges.