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We measured colour indices B-V=0.98$\\pm$0.23, V-R=0.71$\\pm$0.09, R-I=0.14$\\"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"2507.05252","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2025-07-07T17:58:08Z","cross_cats_sorted":["astro-ph.GA","astro-ph.IM"],"title_canon_sha256":"594196a3631f7afd2b7661acf561b929debbd4f3b06963ea5eb5c018d3e1513a","abstract_canon_sha256":"9fba4b123f9f672ff39f3c4922ac987f02bf0c44d808ca662430cbc32391ee04"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T12:00:03.920068Z","signature_b64":"/sGcvSL3+NtqmmM8efNx2zXubPfey6hsBwzg94kQYqD5lv7iCeM6gFGXIFr3HU+0hHqkiPJ0oFWxSSGuTBpqBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f7f69841a8e0d83c01b30338195fbbd861e46166e2248c87494a6cd3cc39da2e","last_reissued_at":"2026-07-05T12:00:03.919585Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T12:00:03.919585Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"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. 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