Overview

• An international team led by James R. A. Davenport argues that rare interstellar visitors like 3I/ATLAS are practical targets for systematic technosignature searches.
• The authors outline four screening categories: unexpected accelerations or maneuvers, spectral or color anomalies and waste heat, non-natural shapes, and narrowband radio or optical transmissions.
• Ongoing observations of 3I/ATLAS with JWST, Hubble, SPHEREx, ground telescopes, and the Allen Telescope Array have found CO2-rich activity consistent with a natural comet and no confirmed technosignatures.
• The study urges standardized observing protocols and strict, independent confirmation procedures to quickly validate or dismiss any claimed anomalies.
• Recent imaging reports describe an anti-solar tail and expanding coma around 3I/ATLAS that align with active comet behavior, with perihelion expected on October 29, 2025.