NASA Spacecraft Reaches Jupiter Trojan Asteroids

The Lucy mission has officially entered the target region to begin studying asteroids near Jupiter.

Updated on Oct. 28, 2026 in Space

A metallic space probe with large solar arrays floating among rocky asteroids near a gas giant in deep space. — NASA’s Lucy spacecraft has reached the Jupiter Trojan asteroid region, marking the start of a multi-year mission to study ancient remnants of the early solar system. AI Illustration. Upload story photo >

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NASA's Lucy spacecraft has successfully reached the Jupiter Trojan asteroid region after traveling more than 2.2 billion miles. It is the first spacecraft to enter this area to study the remnants of our solar system.

Why it matters

Scientists will analyze these ancient asteroids to improve current theories regarding how solar system planets were originally formed.

The Lucy spacecraft has traveled over 2.2 billion miles since its 2021 launch, navigating toward a region located 484 million miles from Jupiter. The Trojan asteroids themselves are separated by an average distance of more than 6 million miles.

The players

NASA

The United States government agency responsible for the nation's civilian space program and for aeronautics and space research.

Lucy

A robotic space probe launched by NASA to explore several asteroids in the Jupiter Trojan region.

The details

Mission engineers track the craft through a combination of radio signals and images of surrounding stars. These asteroids are held in place by the combined gravitational pull of the Sun and Jupiter.

Oct. 16, 2021: The Lucy spacecraft launched from Earth.
Oct. 28, 2026: Lucy reached the Trojan asteroid region.
Aug. 11, 2027: Lucy is scheduled to visit Eurybates.
2030: The craft will return to Earth for a gravity assist.
March 2033: Lucy will explore the binary pair Patroclus and Menoetius.

The Big Picture

This mission marks a significant shift in how researchers investigate the formation of solar system planets by visiting long-untouched space objects. By analyzing the physical properties of these asteroids, scientists hope to replace broad hypotheses with concrete structural data.

As the mission progresses toward its 2033 target date, the resulting data could refine our understanding of planetary physics. This knowledge may eventually influence future aerospace engineering projects and planetary defense strategies.

The takeaway

The arrival of Lucy at the Trojan asteroids highlights the endurance required for modern deep-space scientific exploration. Readers should appreciate that these multi-decade missions rely on precise orbital mechanics to unlock secrets from the infancy of our solar system.

What happens next

The mission has a clear schedule ahead, with the first encounter with the asteroid Eurybates set for Aug. 11, 2027. Following this, the craft will perform a gravity assist return to Earth in 2030, with a final planned exploration of the binary pair Patroclus and Menoetius occurring in March 2033.