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The ESA Proba-3 mission, launched on Dec 5, 2024, consists of 2 spacecraft - the Coronagraph Spacecraft (CSC) and the Occulter Spacecraft (OSC), which will fly together in a 19.7 hour orbit. The OSC's 1.4m disk will eclipse the Sun, while the CSC, 150m away, will observe the Sun’s corona for 6h per orbit.

The 2 spacecraft will autonomously maneuver themselves using thrusters and align to within 1 mm accuracy, using radio links, cameras, lasers and other sensors.

https://www.esa.int/Enabling_Support/Space_Engineering_Technology/Proba-3/Proba-3_Flying_two_spacecraft_is_harder_than_one
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