Interstellar object 3I/ATLAS intrigues scientists with possible acceleration maneuver near the Sun in October

An object of interstellar origin, cataloged as 3I/ATLAS, is at the center of an intense debate in the scientific community. Astrophysicist Avi Loeb, from Universidade of Terra.

The theory of its course a point of great interest to astronomers.

The global astronomical community, through monitoring networks such as Rede Internacional of Alerta of Asteroides, has intensified surveillance over 3I/ATLAS. The main challenge is that the potential maneuver would take place during solar conjunction, an eight-day period starting October 21, when the object will be positioned behind Sol, blocking the view of most ground-based telescopes. Confirmation of any change in trajectory will only be possible after this period of occultation.

Anomalies that put 3I/ATLAS in the spotlight

Initial skepticism regarding the nature of 3I/ATLAS is being challenged by a growing list of atypical features. Avi Loeb and his team have identified at least eight significant anomalies that differentiate this object from known conventional comets. Tais deviations led Loeb to classify the object at level 4 of its probability scale for technological origins. One of the most intriguing observations is the strong negative polarization of the light reflected by its surface, an indication that, according to some studies, may be compatible with a metallic and polished surface, rather than a rocky or icy one. Além Furthermore, the spectral composition revealed an abundance of nickel, an element unusual in comets from our Sistema Solar, but consistent with industrial metal alloys. Outro highlight was the detection of a jet of material pointed directly at Sol, observed in July and August 2025, a behavior contrary to that expected for comets, whose tails are normally pushed by solar radiation in the opposite direction. The object’s trajectory, with an alignment of just 5 degrees in relation to the ecliptic plane, where the planets orbit, is statistically rare for an interstellar visitor, further increasing speculation about its nature.

What is the Oberth maneuver

The Oberth maneuver, proposed by German physicist Hermann Oberth in 1929, is a highly efficient space propulsion technique. Ela consists of activating the engines of a spacecraft at the point of its orbit where the speed is maximum, known as periapsis (or perihelion, in the case of an orbit around Sol). At Nesse point, the gravity of the central body has already accelerated the ship to its peak speed, and any additional thrust applied has its effect multiplied, resulting in a much greater gain in kinetic energy than if the same thrust were applied at any other point in the orbit.

This maneuver is essential for interplanetary missions that seek to maximize speed with a minimum of fuel. If 3I/ATLAS performed such a maneuver, activating some type of propulsion during its perihelion passage about 203 million kilometers from the Sol, it could drastically increase its exit speed from the Sistema Solar. Alternativamente, a reverse thrust could slow it down enough to be captured by Sol’s gravity, entering a stable orbit. The observation of such a change in trajectory would be robust evidence for the hypothesis of a technological origin.

The period of solar occultation

The window of opportunity for a possible maneuver coincides perfectly with a period in which the object will be out of visual range of the Terra. From October 21, 2025, 3I/ATLAS will enter solar conjunction, aligning itself directly behind Sol in relation to our planet.

This alignment prevents optical and radio telescopes based on Terra from observing it, creating a “blind spot” that will last until after its passage through perihelion on October 29. Para Loeb, this coincidence is suspicious as it provides ideal cover for any action that should not be observed.

During this period, speculative theories suggest that a mother probe could, for example, release smaller probes (mini-probes) towards the inner planets of Sistema Solar. Confirmation of any such activity will depend on detecting new objects on similar trajectories or verifying a significant change in the orbit of the main body when it becomes visible again in November.

Natural explanations under debate

Despite the anomalies, most scientists defend natural explanations for the behavior of 3I/ATLAS. NASA and other space agencies officially classify it as an interstellar comet. Modelos developed by Loeb and his colleague Eric Keto suggest that the observed solar jet could be explained by the sublimation of different types of ice on its surface.

The idea is that pockets of ice, like frozen hydrogen or nitrogen, could vaporize at different rates and at different times as they approach Sol. Isso could create gas jets that generate a non-gravitational acceleration, explaining the observed deviation of 5.9 x 10^{-5} AU/day² without the need for artificial propulsion.

Images captured in September by Telescópio Óptico Nórdico, located at Ilhas Canárias, showed the development of a classic cometary tail, which reinforces the hypothesis of a natural body. Críticos of the Loeb theory, like scientist Jason Wright, argue that although the features are unusual, they are not enough to rule out a natural origin, as we still know very little about the diversity of comets from other star systems.

The object’s estimated mass loss, around 2 million tons by October, represents only a small fraction of its total mass, estimated at approximately 33 billion tons. Essa low water fraction and atypical composition, however, continue to fuel debate about its true extrasolar origin.

Available energy and technological potential

At the point of maximum approach to Sol, 3I/ATLAS will be bathed in a colossal amount of energy. Estima is expected to receive more than 33 gigawatts of solar radiation, a power equivalent to about a third of the entire nuclear energy production capacity of the Estados Unidos. If the object is indeed artificial, this energy could be harnessed to power advanced propulsion systems, recharge energy sources or perform complex operations, such as the aforementioned release of secondary probes.

Global monitoring and next steps

The astronomical community remains on high alert. The Centro of Planetas Menores (MPC) is centralizing all of the object’s astrometric data, coordinating observations from telescopes around the world. The recently obtained high-resolution images confirm the evolution of a gaseous coma around the nucleus, typical of an active comet.

Avi Loeb and other researchers recommend intensive searches for any unusual activity in November and December, when 3I/ATLAS will become visible again. The detection of smaller objects moving away from the main body would be a clear sign of technological activity. Spectral analyzes will continue to be carried out to better understand the composition of its surface and the gases emitted. The post-occultation period will be the definitive test for the hypotheses at stake, potentially confirming or refuting the extraordinary nature of this interstellar visitor.