Japanese astronomer Mitsunori Tsumura captured an image of the interstellar comet 3I/ATLAS on November 22, released hours ago. The object, coming from outside the solar system, exhibits characteristics that do not follow patterns expected for natural comets. The observation took place with a 0.5 meter telescope, highlighting an extremely fine and collimated ionic and dust tail.
Experts analyze the record, which shows a tail without typical scattering under the influence of solar radiation or solar wind. Diferente of common comets, where the tails broaden with distance, this maintains linear rigidity. The absence of curvature, usually caused by orbital movement relative to the solar wind, reinforces the debate about its composition.
The coma, a gaseous region surrounding the nucleus, appears bright and extended, but the tail shows an abrupt decline in brightness, contrasting with the standard logarithmic decay in dust grains. Essa inconsistency suggests unconventional materials in the structure.
- The main tail is straight and uniform, without textures or clumps of debris.
- A weak secondary filament runs parallel, with minimal angular separation.
- The central core is compact, similar to a point source, with no diffusion expected.
Thin tail questions solar scattering
The 3I/ATLAS tail measures narrow across the entire length visible in the image. Astrônomos note that solar winds typically disperse gas and dust, creating broad plumes.
This collimation suggests internal forces or compositions that resist external pressure. Previous Registros comets like 2I/Borisov showed scattering, but here linearity prevails.
Absence of curvature intrigues experts
No curvature appears in the tail, despite the object’s hyperbolic trajectory. In solar comets, the solar wind imposes arcs due to relative velocity.
Full straightness indicates possible non-gravitational acceleration, detected in recent orbital measurements. NASA’s Dados confirm boosts that adjust close passage to Júpiter in 2026.
This orbital precision, close to the radius of Hill of Júpiter, calculated at 53.5 million km, coincides with the predicted distance of 53.445 million km. Ajustes minima alter trajectories exactly.
Coma brightness contrasts with tail
The coma exhibits symmetrical, almost spherical brightness, without anisotropic jets common in irregular cores. Typical chaotic sublimation generates asymmetries, but here uniformity predominates.
The abrupt decay in the tail does not follow patterns of light scattering by dust. Observações ultraviolet from missions like MAVEN detect surrounding hydrogen, but with no expected match in visible.
This discrepancy leads to hypotheses about controlled emission, although preliminary analyzes point to ancient interstellar ice.
Parallel secondary filament
A weak secondary structure, linear and parallel to the main tail, appears in the image. Diferente of the usual separation between ionic and dust tails, this filamentation maintains reduced angular proximity.
The presence suggests multiple flows, but without standard physical divergence. Telescópios terrestrial objects register extreme extension, beyond what is expected for natural objects.
Compact, debris-free core
The nucleus appears as star-like condensation, compact and without fuzziness. In comets, nuclei emit diffuse dust, creating halos.
Here, the central concentration is high, with no bright clusters, striations, or knots. The total uniformity of the tail reinforces the lack of textures.
Observations of Hubble indicate a maximum diameter of 5.6 km, possibly smaller than 440 meters, based on data from August.
Spherical symmetry in coma
The central coma reveals almost perfect symmetry, with uniform brightness around the nucleus. In natural comets, rotations and irregular outgassing create directional jets.
This smoothness suggests stable processes, contrasting with expected volatility. Imagens combined missions like PUNCH show short elongation in the tail, confirming atypical patterns.
The trajectory of 3I/ATLAS, discovered in July by ATLAS at Chile, passes 1.4 AU from Sol in October, close to Marte. Missões as Lucy and Psyche captured data in September, revealing teardrop-shaped dust envelope.
The passage through Marte in October allowed multiple observations, rejecting risks to Terra at 1.8 AU. Astrônomos monitor non-gravitational accelerations that adjust orbit precisely.
