James Webb Telescope Observed Asteroid Ring Changes
New findings published in September 2026 reveal shifting opacity levels in the ring system of the asteroid Chariklo.
Updated on Sept. 28, 2026 in Space
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Researchers analyzed data from a 2022 stellar occultation captured by the James Webb Space Telescope to study the rings of the asteroid Chariklo. The study, published on 9 September 2026, confirmed that the opacity of the inner ring had increased by 42%.
Why it matters
These observations provide critical insights into the dynamic behavior of ring systems orbiting small bodies in our solar system. Understanding how these features change over time helps scientists refine models of ring formation and planetary evolution.
The asteroid Chariklo, located 2.3 billion kilometers from the Sun, has a diameter of 302 kilometers and features two rings separated by 14 kilometers. Researchers used stellar alignments identified in the Gaia mission database to facilitate the observation.
The players
James Webb Space Telescope
This is a space telescope designed primarily to conduct infrared astronomy that orbits the Sun at the L2 Lagrange point.
Chariklo
This is an asteroid located in the outer solar system known for being the first minor planet discovered to possess a ring system.
Gaia mission
This is an ongoing space observatory mission launched by the European Space Agency to construct a three-dimensional map of the galaxy.
The details
By utilizing the James Webb Space Telescope to observe a stellar occultation in October 2022, astronomers were able to measure specific changes in the asteroid's ring structure. While the inner ring showed a significant increase in opacity, the outer ring was found to have a lower opacity than previously recorded.
Timeline
The rings of Chariklo were first discovered in 2013.
The James Webb Space Telescope observed the stellar occultation in October 2022.
Research findings were published in Science Advances on 9 September 2026.
The next potential stellar occultation is estimated to occur in approximately 5 years.
Deeper Dive
This research follows a pattern set by the Gaia mission database, which is increasingly utilized to identify precise stellar alignments for planetary science. The study demonstrates how mapping data from space observatories enables the detailed analysis of distant celestial features.
This research enhances the ability of astronomers to track dynamic changes in distant solar system objects using advanced space-based optics. These refined observation techniques could improve future tracking of near-Earth objects and other small celestial bodies.
The takeaway
This discovery highlights the persistent evolution of planetary ring systems even at vast distances from the Sun. Continued monitoring will be required to determine if these opacity changes are transient events or evidence of long-term structural instability.
Further reading
For more updates on solar system research, visit the /science/space/ section.
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