Saturn encounter may have set distant centaur on path to becoming a comet

An ancient icy object, Centaur 450P/LONEOS, located more than 3 billion miles from Earth, has begun releasing gas and dust, a behavior typically associated with comets. Researchers led by UCF Planetary Scientist Charles Schambeau detected carbon dioxide gas, icy dust, and signs of recent thermal activity around the object. The findings, published in The Planetary Science Journal, suggest that 450P/LONEOS may be transitioning from a centaur to a comet. The study used data from NASA's James Webb Space Telescope and the Gemini North telescope. The object's close encounter with Saturn in 1992 is believed to have altered its orbit, bringing it closer to the sun and triggering its activity. The researchers observed the gradual formation of a faint coma, a cloud of gas and dust, as the object's distance from the sun decreased. The detection of carbon dioxide in deep space is significant, as it indicates that the centaur's activity is not driven by water ice sublimation, which would be too efficient at this distance. The findings may provide insights into how icy bodies evolve into active comets as they migrate inward. The study highlights the importance of centaurs as transitional objects that originate in the outer solar system and evolve toward becoming Jupiter-family comets. The object's recent activity may be linked to warming beneath its surface, with buried amorphous ice transforming into crystalline ice, releasing carbon dioxide and creating the coma. The research suggests that the process may explain how 450P became active after its orbit changed and it began receiving more sunlight. The findings could help scientists understand the evolution of distant icy bodies and the transition from centaurs to comets.

AI-generated summary of the original article — see the source for the full story.