{"paper":{"title":"Interstellar comet 3I/ATLAS: discovery and physical description","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA","astro-ph.IM"],"primary_cat":"astro-ph.EP","authors_text":"Ahmed. M. Abdelaziz, Ali Takey, Bryce T. Bolin, Candace L. Gray, Carey M. Lisse, Carl Ingebretsen, Cheng-Han Hsieh, Christoffer Fremling, Diana Roderick, Eslam Elhosseiny, Gracyn Jewett, Ian Wong, Keith S. Noll, Laura-May Abron, Martin Ma\\v{s}ek, Matthew Belyakov, Matthew J. Graham, Michael W. Coughlin, Mona Molham, Mukremin Kilic, Sergey Karpov","submitted_at":"2025-07-07T17:58:08Z","abstract_excerpt":"We describe the physical characteristics of interstellar comet 3I/ATLAS, discovered on 2025 July 1 by the Asteroid Terrestrial-impact Last Alert System. The comet has eccentricity, $e$ $\\simeq$ 6.08 and velocity at infinity, v$_{\\infty}$ $\\simeq$ 57 km/s, indicating an interstellar origin. \\textbf{We obtained B,V, R, I, g, r, i, and z photometry with the Kottamia Astronomical Observatory 1.88-m telescope, the Palomar 200-inch telescope, and the Astrophysical Research Consortium 3.5-m telescope on 2025 July 2, 3, and 6. We measured colour indices B-V=0.98$\\pm$0.23, V-R=0.71$\\pm$0.09, R-I=0.14$\\"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2507.05252","kind":"arxiv","version":3},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2507.05252/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}