The European Space Agency (ESA) has successfully re-established communication with its Proba-3 Coronagraph satellite, which went offline in mid-February. The satellite is designed to create artificial solar eclipses in orbit, allowing scientists to study the sun’s corona—the faint outer atmosphere typically obscured by the sun’s brightness.
Mission Overview and Purpose
Proba-3 consists of two spacecraft: the Coronagraph and the Occulter. The Occulter acts as a precisely positioned sunshade, blocking direct sunlight while the Coronagraph observes the corona. This technique is crucial because the corona’s delicate features are otherwise lost in the glare. The mission launched in December 2024 from India, and relies on extremely accurate positioning; the two satellites maintain a separation of approximately 500 feet (150 meters) with millimeter-level precision.
The Anomaly and Recovery
Last month, an unexplained anomaly caused the Coronagraph to fall silent. According to ESA, this triggered a loss of orientation control and prevented the spacecraft from entering a safe, stable mode. If either satellite fails, the entire mission is at risk, making the recovery a significant relief for the team.
On March 19th, ESA’s ground station in Spain received telemetry data confirming the Coronagraph is now stable and operating in safe mode. The data includes voltage and temperature readings, indicating that the satellite is functional but requires further evaluation.
Next Steps
The Proba-3 team is now conducting comprehensive health checks to assess potential damage sustained during the incident. While the satellite is stable, determining whether it can resume normal operations will require thorough analysis.
The restoration of contact with the Coronagraph is a critical step toward ensuring the continuation of this unique mission, which provides invaluable data on the sun’s outer atmosphere.
The success highlights the challenges of deep-space operations, where even brief communication losses can threaten complex scientific endeavors.
