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Headline: Europa Clipper May Get Chance to Sample Interstellar Comet, Shutdown Looms

CAPE CANAVERAL, FL – NASA’s Europa Clipper spacecraft, currently en route to Jupiter’s moon Europa, may soon have a rare opportunity to sample material from an interstellar comet, 3I/ATLAS. Researchers at the Finnish Meteorological Institute and the European Space Agency have predicted that between October 30 and November 6, Europa Clipper could pass through the comet’s ion tail, a stream of charged particles ejected from the comet.

This fortuitous alignment would allow the spacecraft to directly sample material from a comet originating outside our solar system, offering unprecedented insights into the composition of other star systems. “Sampling the tail in this way is the closest we can currently get to a direct sample of such an object, and thus a different part of the galaxy,” said Samuel Grant of the Finnish Meteorological Institute.

However, the potential scientific windfall faces a significant hurdle: the ongoing U.S. government shutdown. Europa Clipper is currently in cruise mode with not all of its instruments activated. With the critical sampling window rapidly approaching, it remains unclear whether scientists will be able to activate the necessary instruments in time to collect the data.

“Comets act as time capsules, sealing in material from their formation billions of years ago,” Grant explained. The ion tail, unlike the more visible dust tail, is composed of charged particles driven by the solar wind, always pointing directly away from the sun. Scientists can distinguish cometary ions from solar wind ions by their chemical composition, as cometary ions contain a heavier amount of water-group ions.

The prediction of this potential encounter was made possible by a computer code called Tailcatcher, developed by Grant and Geraint Jones. Tailcatcher tracks packets of solar wind material and calculates their trajectories, allowing researchers to identify potential spacecraft-comet tail alignments.

While the ESA’s Hera spacecraft will also be in a position to intercept cometary ions during this period, it lacks the instrumentation necessary to study them. Europa Clipper, with its suite of instruments designed to study Jupiter’s radiation environment, is uniquely equipped for the task.

Even if this opportunity is missed, the success of Tailcatcher in predicting previous comet tail crossings – such as Solar Orbiter’s detection of comet C/2019 Y4’s ions in 2020 – highlights its potential for future discoveries. The ESA’s planned Comet Interceptor mission, set to launch in 2029, aims to directly sample interstellar comets, making future tail crossing predictions even more valuable.

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