Even before it was launched, NASA's Lucy mission was on course to visit more asteroids than any previous mission.

The mission can now add one more asteroid to the list after a surprising finding from a long-running observation programme.

On March 27, Lucy's science team revealed that Polymele, the smallest of the mission's Trojan asteroid targets, has its own satellite.

On that day, Polymele was expected to pass in front of a star, allowing the crew to see the star blink out as the asteroid briefly obstructed, or occulted, it.

By distributing 26 teams of professional and amateur astronomers over the path where the occultation would be visible.

The Lucy team intended to measure Polymele's location, size, and shape with unparalleled precision while it was outlined by the star behind it.

These occultation campaign providing crucial information to the expedition on its asteroid targets.

14 teams reported seeing the star flicker out as it went behind the asteroid.

These two observers spotted an object about 200 kilometres (124 miles) away from Polymele.

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