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First, we use available data and Monte Carlo optimization (validated using 2008 TC3 as template) to obtain a robust solution for the pre-impact orbit of the Chelyabinsk impactor (semimajor axis = 1.62 au, eccentricity = 0.53, inclination = 3.82 deg, longitude of the ascending node ="},"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":"1307.7918","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2013-07-30T11:38:57Z","cross_cats_sorted":[],"title_canon_sha256":"8641d119f1bc1316864b9c69ecc6add1433415245dbcd0f43218c2aff4240b79","abstract_canon_sha256":"848b12fcb4126ee9ebcd9e89ea425d65bc11141fb03faa395e85dfaa148d8438"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:04:37.462618Z","signature_b64":"tqoNmLL7BgMeS2+WyPsbqI9K+at67v151p7dXGa1QLudWgO/ocIdKmLQ26YMJkiFn+WtYmN+lqnb4m0c1fsHDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"846f2edc0545ba4693d9431fcd66fdcb4576eef5c97f13fc2440dc8ac697991d","last_reissued_at":"2026-05-18T03:04:37.461743Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:04:37.461743Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"The Chelyabinsk superbolide: a fragment of asteroid 2011 EO40?","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.EP","authors_text":"C. de la Fuente Marcos, R. de la Fuente Marcos","submitted_at":"2013-07-30T11:38:57Z","abstract_excerpt":"Bright fireballs or bolides are caused by meteoroids entering the Earth's atmosphere at high speed. 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