How a failed satellite became a masterclass in space sustainability

Space · Published 8 October 2026 Swipe more like this →

In short: After a critical power failure ended its mission, the Sentinel-1B satellite transitioned from a vital Earth-monitoring tool into a crucial experiment in orbital responsibility. By meticulously managing its descent, the European Space Agency is turning a technical setback into a blueprint for safer, cleaner space operations.

Launched on 25 April 2016, Sentinel-1B was designed to complement Sentinel-1A as part of the Copernicus programme. Together, they formed a constellation capable of providing the world's largest open dataset of radar imagery. This advanced radar technology allowed for all-weather, day and night monitoring of the Earth's surface, supporting critical tasks like iceberg tracking, glacier-velocity monitoring, and disaster response efforts. This mission represented the first launch for the Copernicus Earth observation component. It utilised an advanced radar instrument to provide constant imagery regardless of weather or light conditions.

The mission faced a significant turning point on 23 December 2021, when a failure in the platform unit powering the Synthetic Aperture Radar rendered the payload inoperative. Despite multiple recovery attempts, the mission officially ended on 3 August 2022. From that point forward, the Sentinel-1 mission relied exclusively on the Sentinel-1A satellite to maintain its continuous radar imaging services. The technical fault specifically affected the unit responsible for powering the Synthetic Aperture Radar. This failure forced the constellation to operate using only the primary Sentinel-1A satellite.

Rather than leaving the defunct spacecraft as orbital debris, the European Union and ESA initiated a structured disposal process. Starting in September 2022, experts worked to lower the satellite's orbit by a few kilometres to clear the path for upcoming Sentinel-1C and Sentinel-1D satellites. This process included passivating the systems to ensure the spacecraft re-enters Earth's atmosphere within 25 years, providing invaluable data for future spacecraft disposal strategies. This collaborative effort involved specialists from the European Commission alongside various industrial partners. Such meticulous planning ensures the satellite's remaining potential is maximised during its final descent.

General information, not professional advice. Spotted an error? Flag the card or see corrections and complaints.

Intellect Plus is a visual educational discovery platform for exploring fascinating facts and ideas. Brain Food, Not Brain Rot. What is Intellect Plus?

Related

• The radar eyes watching Earth through clouds and darkness
• A radar eye that sees through clouds and darkness
• How a single satellite launch expands our global vision of Earth
• How radar satellites see through clouds and darkness to monitor Earth's changing surface
• The final piece of a planetary surveillance puzzle has reached orbit
• How a single satellite helps secure the global food supply
• Could self-replicating machines turn the entire galaxy into a giant factory?
• A new perspective on Earth: the launch of Sentinel-2A
• Closing the gap in our view of Earth's rising coastal seas
• How Europe is preparing its next great eye in the sky
• A revolutionary satellite is about to map almost every drop of Earth's surface water.
• How the Copernicus programme turns satellite data into global policy

More in Space · Latest · A–Z · All topics