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Interstellar Comet 3I/ATLAS Reaches Perihelion as Study Points to Europa Clipper Tail Sampling Window

Observers are preparing for a possible Oct. 30–Nov. 6 Europa Clipper tail encounter to probe its unusual CO2‑rich activity.

Overview

  • The object remains classified as an interstellar comet on a hyperbolic path, with no impact risk and closest distances of roughly 240 million km from Earth and about 210 million km from the Sun.
  • James Webb Space Telescope observations indicate a CO2‑dominated coma with carbon dioxide estimated at roughly eight times the abundance of water, alongside activity detected far from the Sun.
  • An arXiv study by Samuel Grant and Geraint Jones identifies a potential Oct. 30–Nov. 6 alignment for Europa Clipper to intersect the comet’s ionic tail, contingent on solar‑wind conditions and spacecraft operations.
  • Operational constraints linked to the U.S. government shutdown could limit instrument activation during the brief sampling window, researchers caution.
  • Speculation about non‑natural origins, promoted by Avi Loeb, persists in public discourse, but NASA, ESA and most scientists describe the body as a natural comet based on current observations.