An astronomical observation carried out at Havaí has revealed unprecedented details of the interstellar object 3I/ATLAS, deepening the mystery surrounding its passage through our solar system. A high-resolution image, captured on November 28, 2025 by the KalopaStars observatory, recorded an extremely thin and directed jet of matter emanating from its nucleus, accompanied by a luminous and symmetrical coma. Este phenomenon is directly associated with pulses of brightness that occur on a surprisingly regular 16.16 hour cycle, a feature that defies conventional explanations for comet behavior. The regularity and intensity of these pulsations suggest an active internal mechanism, since the object’s core, measuring just 2.8 kilometers in diameter, is considered too small to generate such variations solely through its rotation or irregular solar heating.
The discovery reinforces the need for continuous monitoring, especially with the object’s closest approach to Terra scheduled for December 19, 2025. The international scientific community is mobilized to collect as much data as possible during this unique window of opportunity. The information obtained could redefine understanding of the composition and dynamics of celestial bodies that originate outside our solar system.
Image analysis shows that the jet maintains an unusual geometric structure, with straight contours and absence of turbulence, differing from the chaotic flows often observed in comets in our own system. Este peculiar behavior, added to the exact rhythm of the pulsations, places 3I/ATLAS in a unique category of astronomical study.
The Mystery of the 16.16 Hour Periodic Rhythm
The main anomaly of 3I/ATLAS lies in its variation in luminosity, which pulses with the precision of a clock every 16.16 hours. Astrônomos ruled out that the rotation of the solid core is the only cause, as a body just 2.8 kilometers in diameter would not be able to produce such broad and regular brightness oscillations just because it has an irregular shape. Cálculos indicate that more than 99% of the light detected from the object comes from its coma and jets, and not directly from the nucleus. Isso means that the activity that generates the light is the dominant factor, and this activity is intermittent and cyclical, a behavior rarely seen with such regularity.
Theoretical models suggest that, for a variation in brightness based solely on rotation to reach the observed magnitude, the nucleus would need to be between 10 and 23 kilometers, a size much larger than that measured. The discrepancy between the actual size and that needed to explain the phenomenon by conventional means forces scientists to consider alternative hypotheses. Cada pulse of brightness corresponds to the ejection of a spherical shell of material that expands at an estimated speed of 440 meters per second, reaching a length of up to 25,600 kilometers before dissipating into space, creating a dynamic and fascinating image for telescopes.
Anomalous characteristics of the interstellar jet
The jet recorded by the KalopaStars team has qualities that distinguish it from typical cometary emissions. The Sua shape is remarkably collimated, that is, the particles travel in nearly parallel trajectories, maintaining straight contours over long distances without exhibiting the turbulence expected from a gas escaping from an icy surface heated by the Sol.
Furthermore, the image reveals an intense golden color concentrated near the nucleus, suggesting a localized and punctual heat source. Esse pattern contrasts sharply with the diffuse and widespread heating caused by solar radiation in traditional comets, where heat is distributed more evenly across the surface exposed to light.
Another point of great interest is the direction of emission. Previous Observações had already indicated that the 3I/ATLAS jets do not follow the expected orientation in relation to Sol. Foram recorded jets pointing in different directions, including towards the star itself, a thermodynamically unlikely configuration, since the sublimation of the ice should occur on the heated face and point in the opposite direction.
This directional independence suggests that the energy source for the ejection of the material may not be exclusively solar, raising questions about internal processes that could be fueling this activity. The persistence of this behavior will be one of the main focuses of future observations.
The perspective of Avi Loeb and scientific implications
Studies led by renowned astronomer Avi Loeb, of Universidade of Harvard, have explored the implications of these anomalous observations. The Loeb team argues that magnitude oscillations require an active and persistent mechanism within the coma or on the object’s surface, something that goes beyond simple ice sublimation. The regularity of the 16.16-hour cycle is particularly difficult to explain with standard cometary models, which generally predict more erratic and distance- and angle-dependent activity relative to Sol. The research points to the possibility of physical processes not yet understood or to a complex internal structure that regulates the release of gas and dust on a periodic basis. The nature of 3I/ATLAS, as well as that of the first known interstellar visitor, ‘Oumuamua, continues to challenge the scientific community, suggesting that the diversity of objects in interstellar space may be much greater and more exotic than previously imagined, forcing a revision of classification criteria and theories about the formation of celestial bodies.
Intensified monitoring for maximum approximation
The closest approach of 3I/ATLAS to Terra, scheduled for December 19, 2025, represents a crucial moment for research. Durante this period, the object will be closer and, consequently, brighter, allowing observations with an even greater level of detail.
Ground-based and space-based telescopes, including James Webb, are scheduled to focus on the interstellar visitor. The aim is to record any changes in the pulsation pattern, jet structure and chemical composition of the coma.
The data collected in the coming weeks will be essential to clarify whether the periodic rhythm is stable or whether it changes as the environment around the object changes during its trajectory through the inner solar system. Expectations are high to unravel the origin of this unique behavior.
Technical details of Hawaiian observation
The photograph that brought the 3I/ATLAS jet to light was taken at the KalopaStars observatory, at Havaí, on November 28, 2025. The observatory’s cutting-edge equipment allowed the luminous structure to be recorded with sufficient clarity for a detailed morphological analysis, revealing the precise contour of the jet and the light gradient organized in the coma.
International cooperation in the search for answers
To maximize data collection, observatories on different continents are coordinating observation campaigns. Essa global network allows for almost continuous monitoring of the object, overcoming the limitations imposed by the rotation of the Terra.
The main goal of this collaboration is to build a long, uninterrupted time series of the 3I/ATLAS brightness. Esses data is essential to confirm the persistence of the 16.16 hour cycle and to look for any other periodicities or subtle variations that might provide clues to its nature.
What differentiates 3I/ATLAS from other comets
Comets in our solar system are bodies of ice and rock that, when approaching Sol, heat up and release gases, forming a temporary atmosphere (the coma) and tails. Essa activity is generally driven directly by solar radiation and tends to be continuous, albeit with fluctuations.
3I/ATLAS, on the other hand, exhibits activity that appears to be linked to an internal “engine” that turns on and off at precise intervals. Essa rhythmic pulsation and the geometry of its jet are features that have no clear parallel among known comets, suggesting that their origin in another stellar system may have resulted in a fundamentally different composition or structure.
