The interstellar comet 3I/ATLAS has a narrow, collimated jet with a length of more than 400 thousand kilometers. The structure points directly to Sol. Imagens captured by telescopes in December 2025 shows anomalous features in the brightness of this formation. The scattering of sunlight occurs through particles significantly larger than ordinary space dust. The phenomenon intrigues researchers.
The discovery marks the third confirmed object of external origin to Sistema Solar. The celestial body travels at extreme speeds. The presence of larger grains supports the long extension of the jet against the force of radiative deceleration. Astrônomos applied specific filters to data collected at a distance of 2 astronomical units. The technique highlighted the emission of material in the direction of the star.
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Dinâmica of flow and resistance to solar radiation
Imagens processed between December 13th and 15th, 2025 show the high collimation of the anti-tail jet. The width of the structure remains constant throughout its entire length. Esse pattern suggests a highly targeted release of material from the nucleus. Exact targeting of Sol constitutes a rare event. The actual beam extension reaches proportions ten times greater than the apparent width after projection angle corrections.
The force of solar radiation acts as a natural brake on particles ejected into space. The deceleration directly affects spherical grains with a radius greater than the wavelength of visible light. The impact of this brake depends inversely on the size of each fragment. Smaller Partículas lose speed quickly. Apenas elements with dimensions on the micron scale can travel hundreds of thousands of kilometers without interruption.
The range of small grains is severely limited at a distance of 2 astronomical units. The material’s typical solid density prevents longer journeys under light pressure. Submicrometer Fragmentos would require initial velocities incompatible with the physical limits of natural comets. The sublimated gas does not have sufficient drag force to accelerate the fine dust to the necessary levels. The large size of the particles solves this physical issue.
Limites physics and core composition anomalies
Scientists have set constraints on the maximum radius of the dominant particles in the structure. Excessively large Grãos have a smaller surface area per unit mass. Essa characteristic reduces the efficiency in scattering sunlight. The object’s mass loss rate reached about 500 kilograms per second near perihelion. The ejected volume allows the precise calculation of the luminous flux density.
The jet opening angle measures approximately 8 degrees. Extreme collimation indicates that the gaseous drag time remains shorter than the material dilution time in space. The condition restricts the maximum fragment radius to values below 100 microns. Comets originating from Sistema Solar exhibit different behavior. The local tails have an absolute domain of submicrometer dust with high light scattering efficiency.
- Fine dust dominates the brightness in known celestial objects like Hale-Bopp.
- The larger grains of 3I/ATLAS better resist the pressure of solar radiation.
- Extreme collimation points to the release of material on a limited fraction of the surface.
- The continued activity after passing through perihelion contrasts with long-period comets.
- The reddish composition of the coma indicates the presence of complex organic dust.
The 3I/ATLAS nucleus has a lower size limit calculated from records from the Hubble telescope. Greatly reduced Dimensões would not sustain the rates of mass loss documented by the research teams. The rotation of the celestial body directly affects the release patterns of material in the vacuum. Variações observed in the jet suggests a rotation period of approximately 15 hours. Sublimation of volatiles confirms intense cometary activity.
Hyperbolic Trajetória and approximation with Terra
The interstellar visitor follows a well-defined hyperbolic orbit. The excess speed reaches the mark of 58 kilometers per second. The object crossed the boundary of Sistema Solar from deep space before perihelion. The closest passage of Sol occurred in October 2025. The closest approach to the planet Terra occurred in December. The minimum distance recorded was 1.8 astronomical units.
The celestial body quickly moves away from our planetary system towards interstellar space. The behavior differs from the first confirmed visitors in the last decade. The 3I/ATLAS presents superior speed and much more pronounced activity than the 1I/’Oumuamua and the 2I/Borisov. The ATLAS monitoring system carried out the initial detection in July 2025. The emission of material occurs preferentially on the side illuminated by the star.
The asymmetry in mass release explains the direction of the jet pointed towards Sol. Loss rates increased during maximum approach and maintained high levels in the following weeks. The dense flow decreases in intensity according to the square of the distance from the nucleus. Modelos mathematicians based on a narrow cone accurately reproduce the collimation recorded in astronomical photographs.
Coordenação global to object mapping
The observation campaign mobilized a global network of professionals and amateur astronomers. The Subaru telescope captured detailed images during early morning twilight in December 2025. The data reveals a diffuse coma around the main nucleus. Instrumentos from the American space agency recorded the celestial body in multiple bands of the electromagnetic spectrum. Missões in transit through space helped in collecting additional information.
Ultraviolet light analyzes detected a hydrogen envelope around the main structure. Processing the images with gradient filters allowed the fine lines of the jet to be visualized. The unchanged width of the emission suggests the existence of a fine-focusing mechanism on the comet’s surface. The release of material through a specific crack justifies the pattern seen by terrestrial and space equipment.
Temporal variations in the emission indicate a possible precession in the object’s rotation axis. The periods derived from this oscillation coincide with independent estimates made by different research teams. The length of the jet reaches extreme values by the standards of modern astronomy. The phenomenon challenges traditional models of dust dynamics. Future Medições spectroscopy will seek to determine the exact velocity of the flow through the Doppler displacement.