Lucy probe reaches Jupiter Trojans after 5 years

The NASA Lucy probe has reached the group of Jupiter Trojans that precede Jupiter after a five-year journey and more than 3.5 billion kilometers, according to the Italian agency ANSA. The arrival marks the start of the scientific operations phase in the cluster of bodies sharing the planet's orbit.

Arrival Overview — Lucy, Jupiter Trojans, Jupiter

Lucy completed roughly five years of travel and covered more than 3.5 billion km to position itself among the Trojans that precede Jupiter, according to ANSA. The Trojans are divided into two clusters: one that precedes Jupiter in its orbit (the so‑called the “Group L4”) and another that follows Jupiter (the “L5” group). The spacecraft entered the L4 region, where it will begin detailed observations of several bodies.

The mission, led by NASA, aims to study these primitive asteroids to glean clues about the formation and evolution of the Solar System. ANSA covers the event as a reference for international reporting on the arrival.

What are the Trojans and why do they matter — Trojans, Jupiter, scientific importance

The Jupiter Trojans are small bodies that reside at gravitational balance points (the Lagrange points) in Jupiter’s same orbit. Scientists consider these objects as fossils of the era when the Solar System formed, because they preserve in their compositions traces of the original building materials.

Studying the Trojans can help answer central questions in astronomy:

• how the giant planets formed and migrated in the early stages;
• what the chemical and thermal conditions of the protoplanetary disk were;
• how collisions and fragmentations shaped small bodies.

The Lucy mission aims to gather data on composition, structure, and impact history of these asteroids, enabling comparisons with comets and other trans-Neptunian objects, to build a more complete picture of Solar System evolution.

Next mission steps — Eurybates and future encounters

Lucy is currently part of the observational suite for the Trojans that precede Jupiter. The first close flyby is scheduled for August 2027, with the asteroid Eurybates, as reported by ANSA.

Eurybates measures about 70 km in diameter and is known for being one of more than 200 fragments produced by a large impact that shattered a parent body. Observations of Eurybates aim to clarify:

• the composition of the fragments and their diversity;
• the chronology and mechanism of the impact event that created the fragments;
• the presence of craters, internal structures, and surface properties.

After Eurybates, the mission plans flybys and studies of other Trojans in the same complex, collecting high-resolution images, spectroscopy, and other data to reconstruct the history of these objects.

Relevance for Brazilian readers and descendants — science, education, and outreach

The Lucy arrival at the Trojans marks a milestone in space exploration with global scientific impact, relevant for readers in Brazil interested in science, technology, and education. Mission results are likely to feed science communication programs, educational material, and university projects that can reach schools and cultural institutions, including communities of Italian descent in the country.

Regular coverage of the mission and its findings offers opportunities for:

• teachers to integrate recent discoveries into science and astronomy classes;
• cultural institutions to promote space exploration-themed events;
• Brazilian students to follow data and images that inspire STEM careers.

Readers interested in Italian current affairs and how science and technology are treated in European media can follow other reports in our Notícias da Itália. Those researching cultural heritage and citizenship will also find relevant content in Cidadania Italiana and articles about life and science in the country in Vida na Itália.

"Lucy alcançou o grupo de asteroides Troianos que precede Jupiter após cinco anos de viagem e mais de 3,5 bilhões de km", segundo a ANSA.

The arrival opens a new observational phase that should yield discoveries about the origin and dynamics of Solar System small bodies, with images and scientific data published as the mission progresses.

Source: ANSA