Overview
- The SETI Institute published the null result on June 3, 2026, reporting that targeted radio scans found no technosignatures associated with 3I/ATLAS.
- Researchers used the Allen Telescope Array to scan 1–9 GHz for narrowband signals during more than seven hours of observations and initially logged about 74 million candidate signals.
- After automated filtering and follow-up, roughly 200 remaining candidates were traced to human sources on Earth or to Earth-orbiting satellites, leaving no extraterrestrial source.
- The study places quantitative upper limits on any radio transmitter on or near 3I/ATLAS of about 10 to 110 watts across the surveyed band, roughly the power of common household appliances.
- Independent spacecraft and spectroscopic data that show a methanol-rich, carbon-dioxide coma support the cometary natural origin and the study’s value as a method test for future interstellar object searches.