The North American space agency used TESS equipment to create an impressive visual record, joining several photographs that form a 28-hour clip focused on the journey of the celestial body 3I/ATLAS. This capture occurred in the window between January 15th and 22nd, 2026, at which time the space traveler had already surpassed its closest approach to our Sun and was beginning to move away. In the images generated, the cosmic visitor appears as a luminous point highlighting its tail facing the central star of our system, contrasting with the brightness of the constellations in the background.
The work of assembling this audiovisual material was led by scientist Daniel Muthukrishna, a researcher linked to the Massachusetts Institute of Technology (MIT) and member of the project. During data collection, there was a small operational hiatus between January 15th and 18th, caused by a temporary failure in the solar energy capture panels, which forced the equipment to enter an automatic protection state. Even with this pause, the volume of photographs obtained was sufficient to map the path taken by the celestial body with extreme precision.
Although this telescope’s main mission is to search for worlds outside our solar system through the observation of planetary transits, its long-range lenses were fundamental in framing 3I/ATLAS. The entire collection generated by this scan is already released for public access in the Mikulski Archive, a repository focused on information from space telescopes.
- The initial identification of 3I/ATLAS took place on July 1, 2025, thanks to the ATLAS complex equipment installed in Chilean territory.
- The hyperbolic shape of its orbit served as definitive proof that the celestial body came from outside our system, a finding made shortly after the first sighting.
- The point of closest proximity to our star, known as perihelion, was reached on October 30, 2025, at a distance of 1.4 astronomical units — which is equivalent to around 210 million kilometers.
How space scanning technology identifies celestial bodies
NASA’s exoplanet hunting equipment has the ability to monitor vast areas of the cosmos for cycles that last about thirty days. His working method is based on noticing subtle drops in the luminosity of distant stars, which generally indicates that a planet has crossed in front of the star. Thanks to this privileged panoramic view, the machine was able to record the presence of 3I/ATLAS in May 2025, bringing the official discovery forward by almost sixty days.
To confirm this early detection, experts needed to superimpose thousands of photographs from that time, finding the visitor’s trail retroactively. At that initial moment, the celestial body displayed a stable luminosity, without any indication of tail formation or gas emission. It was only in the January 2026 observation window that the dynamics changed, revealing the elongated, bright structure driven by solar radiation.
Visual details and behavior of the cosmic traveler
The animation created by the scientific team displays the target as a small accelerated point crossing the star-dotted darkness. The formation of its tail directed towards the Sun is a characteristic feature of icy bodies that come into activity, releasing large amounts of dust and gaseous elements when heated. Even though the telescope’s lenses do not offer the ideal sharpness to see minutiae, the continuity of the images provides rich material to evaluate the fluctuations in light emitted by the nucleus.
The academic community is now preparing to unravel these files in search of cyclical patterns that help define the exact time it takes for the object to rotate around its own axis, currently calculated at 7.1 hours thanks to previous measurements from the Hubble Space Telescope. The scientists’ joint effort involves checking for small vibrations in the tail’s extension, a direct sign of how the rocky core is rotating in a vacuum.
The visitor’s level of chemical and physical agitation increased dramatically after it circled our star. Spectroscopy-based analyzes indicate that it carries dust particles of considerable size, presenting a reddish tone that is very reminiscent of the visual composition of asteroids classified as type D, common at the edges of our system.
Differences in relation to other visitors from outside the system
This is only the third celestial body with proven origins in another region of the galaxy to cross our neighborhood. The pioneer on this list was 1I/’Oumuamua, discovered in 2017, which drew attention for its cigar shape and the total absence of a gas cloud around it. Two years later, 2I/Borisov entered radars, showing a classic comet structure, with a well-defined tail and chemical reactions familiar to astronomers.
In contrast to the mysterious ‘Oumuamua, the new visitor began expelling material and forming its protective cloud when it was still immense distances away. Its geological structure appears to house organic elements that have suffered strong radiation over millennia, which explains the reddish color captured by the sensors. Furthermore, the extremely wide curve of its route proves that it travels at very high speeds, making it impossible for solar gravity to trap it in a closed orbit.
Support of high-resolution lenses in data collection
The veteran Hubble Space Telescope also joined the task force, recording 36 detailed photographs between the end of 2025 and the beginning of 2026. This photo session took advantage of a very rare geometric moment, where the Earth, the Sun and the space traveler were aligned with a margin of error of just 0.69 degrees. The result of this perfect positioning were images with a definition quality much higher than those generated by exoplanet scanning equipment.
Through these high-fidelity captures, scientists can clearly visualize the branches of the tail and the strong emissions of material emanating from the core. All this volume of refined information acts as a guide to correctly adjust and interpret less sharp TESS videos. The union of these two observation fronts provides a robust overview of how the object’s surface reacts to heat.
The path taken since the first detection
The first warning signal about the celestial body’s approach sounded when it was still sailing 4.5 astronomical units away from our central star. Immediately, ground-based observatories focused on the target and confirmed the existence of a diffuse cloud and a characteristic trail. The use of different capture technologies around the globe served to establish, without a doubt, that it was an active comet.
On its outward journey, the object crossed the vicinity of Mars’ route and continued its journey towards deep space after January 2026. As its speed is extreme, our system’s gravitational field does not have enough strength to stop or capture it. This lightning passage is seen by the scientific community as