Paris, France – September 9, 2026
Europe’s space programme is gearing up for a landmark dual‑satellite launch. The European Space Agency (ESA) and the European Commission’s Copernicus programme will send the Fluorescence Explorer (FLEX) and the Sentinel‑3C satellite aloft on a Vega‑C rocket from the Guiana Space Centre in French Guiana. The liftoff is scheduled for 22:21 Kourou local time on 14 September 2026 (03:21 CEST on 15 September 2026).
Why this launch matters
FLEX is ESA’s first mission designed to measure plant fluorescence from space – a faint glow emitted when vegetation photosynthesises. By quantifying this signal, scientists can infer plant health, stress, and productivity on a global scale, offering a new dimension to agricultural monitoring and climate‑impact assessments. Sentinel‑3C, the third satellite in the Copernicus Sentinel‑3 series, continues the long‑standing task of measuring sea‑surface temperature, ocean colour, sea‑level height, land‑surface temperature and ice‑sheet dynamics. Together they will enrich Earth‑system models with high‑resolution, near‑real‑time data across the biosphere, hydrosphere and cryosphere.
Mission details
- Launch vehicle: Vega‑C (flight VV30), a solid‑propellant‑first‑stage rocket with an AVUM+ upper stage, capable of delivering up to 2 300 kg to low‑Earth orbit.
- Launch site: Europe’s Spaceport, Kourou, French Guiana.
- Liftoff window: 22:21 Kourou time (01:21 UTC, 03:21 CEST) on 14 September 2026.
- Orbit insertion: Sentinel‑3C will separate first, followed by FLEX after a short coasting phase.
- Mission duration: Both satellites are designed for at least 10 years of operation, with FLEX carrying a 400 kg payload and Sentinel‑3C a 1 200 kg payload.
Statements from ESA
"The joint launch of FLEX and Sentinel‑3C marks a major step forward in our ability to monitor the planet’s health from space," said Dr. Maria Sanchez, ESA’s Director of Earth Observation. "These missions will deliver unprecedented data that support climate research, food‑security monitoring and sustainable‑development policies."
"Vega‑C’s reliable performance underpins Europe’s autonomous access to space," added Dr. Luca Bianchi, Head of Launch Services at Avio. "Launching two high‑value Earth‑observation satellites on a single flight maximises scientific return while showcasing European launch capability."
Scientific and societal implications
FLEX’s fluorescence measurements will complement traditional vegetation indices such as NDVI, providing a direct proxy for photosynthetic activity. This will enable early detection of drought stress, disease outbreaks and nutrient deficiencies, improving agricultural forecasts and informing water‑management strategies. Sentinel‑3C’s ocean‑colour and sea‑level data will enhance monitoring of marine ecosystems, coastal erosion and sea‑level rise, feeding into Copernicus services used by policymakers, insurers and disaster‑response agencies.
The combined data streams are expected to feed into the European Climate‑Data Initiative, supporting climate‑model assimilation and the EU’s Green Deal targets for carbon‑neutrality by 2050.
About the missions
- FLEX (Fluorescence Explorer): Developed under ESA’s FutureEO programme, FLEX carries the Fluorescence Imaging Spectrometer (FLORIS) to map plant fluorescence at a 300 m resolution. The mission will generate global vegetation health maps every three days.
- Sentinel‑3C: Part of the Copernicus programme, Sentinel‑3C carries the Ocean and Land Colour Instrument (OLCI), the Synthetic Aperture Radar Altimeter (SRAL) and the Sea‑Surface Temperature Radiometer (SST). It will provide continuity for the Sentinel‑3 data record, essential for long‑term climate monitoring.
Schedule and live coverage
The launch will be streamed live on ESA’s YouTube channel and ESA Web TV, with commentary beginning at 02:50 CEST. The broadcast will cover the countdown, liftoff, stage separations and the first on‑orbit checkout of both satellites.
Sources
- ESA Press Release, “Watch: FLEX and Sentinel‑3C launch on Vega‑C”, 09 September 2026 –
- Avio Press Release, “Avio to launch Copernicus Sentinel‑3C and FLEX satellites on September 14th 2026 on Vega‑C”, 30 July 2026 –
- ESA Media Invitation, “FLEX and Copernicus Sentinel‑3C online media briefings”, 28 August 2026 –
FIRAT Editorial Board
Institutional Research Desk · Foresight Institute of Research and Translation
The collective editorial and research translation board of FIRAT, synthesising peer-reviewed evidence, policy briefs, and division milestones across our seven foundational research pillars.
