TITLE: Lucy Probe Reaches Jupiter's Trojan Asteroids (content update)

CATEGORY: science / space

Meta description: The Lucy mission from NASA is on its way to Jupiter's Trojan asteroids; the first confirmed close encounter with Eurybates is scheduled for August 2027.

The NASA Lucy probe is the first mission designed to study Jupiter's Trojan asteroids. According to ANSA reporting (10/29/2026) and public mission information, Lucy is on a trajectory to the swarm of Trojans that precedes Jupiter (the L4 group) and has the first close flyby planned for August 2027, when it will encounter Eurybates. Mission data should shed light on the formation and evolution of the Solar System.

Mission Overview — Lucy, the NASA mission, and the Trojans

The Lucy mission, run by NASA, is designed to study Jupiter's Trojan asteroids, with several flybys planned across the 2020s and 2030s. The probe is on course for the set of bodies that precede the giant planet in its orbit (the so-called L4 swarm). Lucy is the first mission specifically dedicated to visiting multiple Trojans and obtaining detailed data to help understand these objects, regarded by many scientists as primitive remnants of the protoplanetary disk.

What are Trojan asteroids

Trojan asteroids are small bodies occupying regions near gravitational balance points (Lagrange points) in Jupiter's orbit around the Sun. For Jupiter there are two main swarms: the group that precedes the planet (L4) and the one that follows (L5). These objects have roughly the same semi-major axis as Jupiter because they share the planet's orbit, and they remain clustered near L4 and L5.

Next steps and Lucy's targets

Lucy will conduct a series of flybys and close observations. The first very close encounter is scheduled for August 2027, when the probe will fly by Eurybates, one of the L4 Trojans. Detailed surface mapping, compositional measurements, and searches for possible satellites or debris in the vicinity are planned. Operations follow the mission team's calendars and protocols, coordinated by NASA.

Data on Eurybates

Eurybates is estimated to be about 60–70 km in diameter.

Eurybates is one of the bodies in the L4 Trojan swarm. Reports indicate it is part of a related group of objects (including a large number of small fragments associated). The planned 2027 flyby should allow confirmation of Eurybates' physical, geological, and compositional characteristics and to check for small fragments or debris in its vicinity.

Scientific importance — why study the Trojans?

Trojans are considered primitive remnants of the protoplanetary disk. Close study of these objects can illuminate key questions about:

• the formation of planets and smaller bodies;
• planetary migration processes that reorganized the Solar System;
• the primitive composition of materials that gave rise to rocky and gaseous worlds.

Data collected by Lucy could help reconstruct parts of the Solar System's early history and provide evidence about the origin and long-term orbital stability of these bodies.

Relevance for readers

ANSA's report does not point to specific direct impacts for Brazilians or the Italian-descendant community. Space exploration often has indirect effects on scientific education, technology, and inspiration for new generations, topics of interest for science-and-culture portals.

Conclusion The Lucy mission will mark the first detailed exploration of Jupiter's Trojans. The Eurybates flyby, planned for August 2027, will be the first in a series of important encounters that could provide decisive clues about the Solar System's history.

Source: ANSA (interpreted with caution and adjusted to avoid claiming flybys occurred before August 2027).