The Proba-3 mission features two spacecraft, the Coronagraph and Occulter, which will fly in close formation, maintaining just 150 meters of distance between them. The Occulter will block the Sun's disk, enabling the Coronagraph to study the Sun's faint corona.

ISRO is set to launch the ESA’s Proba-3 mission on December 4, 2024, aimed at studying the Sun's corona using precision formation-flying between two spacecraft. This mission, showcasing international collaboration and advanced technology,

Dubbed as the world's first initiative, the Proba-3 - Project for Onboard Autonomy - comrises a double-satellite in which two spacecraft would fly together as one, maintaining precise formation down to a single millimetre to study the sun's outer atmosphere.