Provenance Record

Strong News piece, 736 words. Careful science journalism with explicit caveats: the article notes the size discrepancy between Sci.News (500 km) and Science News (470 km), labels candidate gases as not yet spectroscopically confirmed, and quotes both the lead researcher and an independent skeptic.

{"source-0_scinews":"Verified: Ko Arimatsu, Ishigakijima Astronomical Observatory; '~500 km' diameter; 'dissipate in less than 1,000 years unless it is somehow replenished'; Nature Astronomy publication May 4 2026.","source-1_spacecom":"Verified: '1.05-meter telescope at Kiso Observatory run by the University of Tokyo' + 'amateur-grade 200mm and 250mm' equipment; 100-200 nanobars surface pressure; Pluto comparison numerics; cryovolcanism vs. impact hypotheses; Arimatsu 'traditional idea that global dense atmospheres form only around larger planets must be revised'.","source-2_sciencenews":"Verified: 'three locations' on January 10 2024; 'about 1.5 seconds' gradual dimming; '~470 kilometers' diameter (the lower estimate the article notes); Arimatsu '\"Until now, Pluto was the only trans-Neptunian object with a confirmed atmosphere\"'.","source-3_cbsnews":"Verified verbatim: '5 million to 10 million times thinner than Earth's protective atmosphere'; '50 to 100 times thinner than even Pluto's tenuous atmosphere'; 'more than 3.4 billion miles away'; methane/nitrogen/carbon monoxide candidates; 2:3 plutino orbital resonance; Alan Stern (Southwest Research Institute, New Horizons lead, not involved in study) quote 'This is an amazing development, but it sorely needs independent verification' attributed correctly to Stern (not Arimatsu).","source-4_nature":"Verified: paper title 'Detection of an atmosphere on a trans-Neptunian object beyond Pluto', author Ko Arimatsu et al, '~250-km-radius plutino (612533) 2002 XV 93', refractive signature, 'surface pressure of 100–2[00 nanobars]'."}

All quoted material traced verbatim. Stern quote correctly attributed (not conflated with Arimatsu's preceding statement, which is a journalist-paraphrased framing). Numerical claims (100-200 nanobars, 5-10M times thinner than Earth, 50-100 times thinner than Pluto, ~500 / ~470 km diameter, 1.5 seconds, 3.4 billion miles, January 10 2024) all verified.

APPROVE_WITH_CORRECTIONS. Cryptography, sources, and content all clean. Disciplined science journalism with appropriate caveats. Only finding is the sci.news allowlist gap.