Interstellar comet 3I/ATLAS, discovered in July 2025 by NASA’s ATLAS system at Chile, continues its journey through Sistema Solar and approaches a significant gravitational encounter with Júpiter. The object, confirmed as the third interstellar visitor after 1I/’Oumuamua and 2I/Borisov, travels at a hyperbolic speed of about 58 km/s, incompatible with local origins. Recent Pesquisas indicate that this approach, scheduled for March 16, 2026, will occur close to the planet’s Hill radius, where the gravity of Júpiter predominates over that of Sol.
Astronomers modeled the comet’s trajectory considering planetary interactions and non-gravitational effects, such as gas jets and solar radiation pressure. The study highlights that the passage close to Júpiter will cause a measurable disturbance, slightly altering the object’s course before its definitive exit from Sistema Solar towards the constellation of Gêmeos. Previous Observações have already refined orbital calculations, incorporating data from ground-based and space-based telescopes.
Gravitational encounter with Júpiter
Comet 3I/ATLAS will cross the region close to the Hill radius of Júpiter, estimated at about 0.355 AU. Essa zone defines the limit where the planet’s gravitational influence exceeds the solar one, allowing for a more intense interaction.
Calculations based on dynamic simulations show that the minimum distance will be approximately 0.358 AU, which makes the effect of Júpiter the most relevant among planetary perturbations. The interaction will help refine models of how gas giants affect hyperbolic objects.
Recent comet observations
Images captured by ESA’s JUICE probe in November 2025 revealed a bright coma and pronounced tail in 3I/ATLAS, confirming its active cometary nature. The JANUS camera recorded the object expelling dust and gas after perihelion.
Telescopes such as Hubble and James Webb have provided complementary data on the composition and structure of the nucleus. Essas observations occurred at strategic moments, including favorable alignments with Terra and Sol.
Origin and characteristics of the object
Researchers indicate that 3I/ATLAS likely originated in the thick disk of Via Láctea, a region of old stars with distinct motions from the thin disk where Sol resides. Simulações sugerem que o cometa vaga pelo espaço interestelar há bilhões de anos.
The chemical composition carries information about distant stellar environments, functioning as a galactic messenger. Sua speed and hyperbolic trajectory confirm external origin, with no orbital link with Sol.
Possible non-gravitational effects
Jets of gas released by solar heating close to perihelion, in October 2025, generated subtle accelerations in the trajectory. Radiation pressure also contributes to minute orbital variations.
These factors, combined with the disturbance of Júpiter, may result in additional deviations in the future route. Novas observations remain essential for greater model accuracy.
Monitoring by probe Juno
The Juno probe, in orbit around Júpiter since 2016, offers a favorable window for monitoring between March 9 and 22, 2026. The mission’s Instrumentos can capture nearby data during the comet’s passage.
This rare opportunity allows for detailed studies of the gravitational interaction between an interstellar visitor and a giant planet. Cientistas await refinement of orbital calculations with these measurements.
Past and future trajectory
The comet entered Sistema Solar from the direction of Sagitário and, after the expected disturbance, will head towards Gêmeos. Modelos statistics with hundreds of simulations incorporate uncertainties in the initial orbital data.
The passage through Marte before perihelion also generated small influences, but the effect of Júpiter stands out due to its proximity to the radius of Hill. The object does not pose any risk to Terra or the planets.
Scientific importance of the event
Interstellar comets provide unique clues about planetary formation in other star systems. The encounter with Júpiter represents a chance to observe orbital dynamics in real time.
Studies like the Indian one on arXiv reinforce the value of these objects for understanding ancient galactic processes. Continuous Observações until the comet’s exit in 2026 enrich astronomical knowledge.