NASA’s TESS Captures Rare Interstellar Comet 3I/ATLAS

NASA’s TESS spacecraft has captured a fresh series of images of the interstellar comet 3I/ATLAS, providing scientists with a close-up look at the comet’s behavior as it leaves our solar system. The data collected will help analysts understand the comet’s brightness variations, rotation, and activity. This object is one of only three known interstellar visitors, making it a rare and valuable subject of study.

The interstellar comet 3I/ATLAS has been observed by multiple telescopes, including Hubble and James Webb, which have also snapped images of the comet. Researchers are racing to collect as much data as possible before the object vanishes from sight. The brief observation window and interruptions from TESS’s safe mode complicate efforts to nail down the spin, but the data collected so far offers valuable insights.

On January 22, 2026, the interstellar object 3I/ATLAS aligned to within an exceptionally small angle of 0.69 degrees with the Earth-Sun axis. This rare alignment resulted in a brightness surge whose magnitude and growth rate are dictated by the composition and structure of the particles shed by jets of 3I/ATLAS. This alignment provided a unique opportunity for Hubble to observe the comet under conditions that may not repeat for decades.

NASA Exoplanet Probe Tracks Interstellar Comet 3I/ATLAS to Gauge Its Spin

NASA’s TESS spacecraft recently caught a glimpse of interstellar comet 3I/ATLAS. During a special observation run from Jan. 15 to Jan. 22, the Transiting Exoplanet Survey Satellite (TESS) repeatedly observed comet 3I/ATLAS as it headed out of our solar system. With its wide field of view, TESS recorded the comet as a bright, fast-moving dot dragging a faint tail across a crowded starfield.

This capability helped astronomers spot comet 3I/ATLAS before they even knew it was there. TESS happened to observe a comet in May 2025, two months before 3I/ATLAS was discovered. By looking back through all the data and compiling multiple observations, astronomers could filter out the interstellar visitor through the noise and track its movements. While this doesn’t tell us where the comet originated, it does give us other key details.

The recent 3I/ATLAS observations were temporarily interrupted from Jan. 15 to 18 when TESS entered a safe mode following an issue with its solar panels. Despite this interruption, the data collected provides valuable information about the comet’s activity and rotation.

Rare Cosmic Lineup Gives Hubble Close Look at 3I/ATLAS

On January 22, 2026, the NASA/ESA Hubble Space Telescope observed the interstellar comet 3I/ATLAS nearly perfectly aligned with the Sun-Earth axis, revealing unprecedented jet structures and an extended anti-tail. This rare alignment provided a unique opportunity for Hubble to capture detailed images of the comet.

Interstellar objects provide unique opportunities for studying materials from other stellar systems. Unfortunately, 1I/Oumuamua did not display traces of gas or dust around it, and 2I/Borisov was only observed at phase angles relative to the Sun-Earth axis of over 16 degrees and never near opposition. The alignment of 3I/ATLAS offers a rare chance to study such an object in detail.

The image of the interstellar comet 3I/ATLAS was captured by Hubble’s WFC3 instrument on January 22, 2026, at 13:40 UTC. This image provides valuable insights into the comet’s composition and activity, which will help scientists compare this visitor’s composition and activity with comets formed near our own Sun.

A Comprehensive Network for the Discovery and Characterization of Interstellar Objects Like 3I/ATLAS

The discovery and characterization of interstellar objects like 3I/ATLAS require a comprehensive network of telescopes and data analysis techniques. The Hubble and James Webb space telescopes have played crucial roles in capturing detailed images and data of the comet. These observations provide valuable insights into the comet’s nucleus, rotation, and activity.

The nucleus of 3I/ATLAS is inferred to have an effective diameter of 2.6 (±0.4) kilometers for an assumed typical albedo value of 0.04. This information, along with data on the comet’s brightness variations and jet structures, helps scientists understand the comet’s composition and behavior. The puzzling methane outgassing observed in 3I/ATLAS adds another layer of complexity to the study of interstellar objects.

The future outlook for the study of interstellar objects like 3I/ATLAS is promising. As more data is collected and analyzed, scientists will gain a better understanding of these rare visitors from other stellar systems. The insights gained from studying 3I/ATLAS will contribute to our knowledge of the universe and the materials that make up other solar systems.

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