{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:IF2RPQMYBMQTLC4ROYS7DZ7AYB","short_pith_number":"pith:IF2RPQMY","canonical_record":{"source":{"id":"2606.30748","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2026-06-29T18:00:19Z","cross_cats_sorted":["physics.hist-ph"],"title_canon_sha256":"923328820b288fa2b38efb3b07c44aa2b1f81ac86fec22be5e89832f31e152d0","abstract_canon_sha256":"ac113f6f19730340a838385030e27116bbe7afb10236b6c8df227c21a5482f2f"},"schema_version":"1.0"},"canonical_sha256":"417517c1980b21358b917625f1e7e0c06e021cbc642cc3f9919cb4e2fd85852a","source":{"kind":"arxiv","id":"2606.30748","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2606.30748","created_at":"2026-07-01T00:17:15Z"},{"alias_kind":"arxiv_version","alias_value":"2606.30748v1","created_at":"2026-07-01T00:17:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2606.30748","created_at":"2026-07-01T00:17:15Z"},{"alias_kind":"pith_short_12","alias_value":"IF2RPQMYBMQT","created_at":"2026-07-01T00:17:15Z"},{"alias_kind":"pith_short_16","alias_value":"IF2RPQMYBMQTLC4R","created_at":"2026-07-01T00:17:15Z"},{"alias_kind":"pith_short_8","alias_value":"IF2RPQMY","created_at":"2026-07-01T00:17:15Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:IF2RPQMYBMQTLC4ROYS7DZ7AYB","target":"record","payload":{"canonical_record":{"source":{"id":"2606.30748","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2026-06-29T18:00:19Z","cross_cats_sorted":["physics.hist-ph"],"title_canon_sha256":"923328820b288fa2b38efb3b07c44aa2b1f81ac86fec22be5e89832f31e152d0","abstract_canon_sha256":"ac113f6f19730340a838385030e27116bbe7afb10236b6c8df227c21a5482f2f"},"schema_version":"1.0"},"canonical_sha256":"417517c1980b21358b917625f1e7e0c06e021cbc642cc3f9919cb4e2fd85852a","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-01T00:17:15.780933Z","signature_b64":"0RWHO9lOj6+7L7xhas1f0Z7YMhmglbC57H+EY64R8yS62SS5l1jQA5/e/wso82DJU8uBhyLsqVv4RZjYyZfOBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"417517c1980b21358b917625f1e7e0c06e021cbc642cc3f9919cb4e2fd85852a","last_reissued_at":"2026-07-01T00:17:15.780531Z","signature_status":"signed_v1","first_computed_at":"2026-07-01T00:17:15.780531Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2606.30748","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-01T00:17:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"XatJSa+Hw9FLm48G1azt218gBwidTb27JX/Tk9Qj4gDP3e7223ZIAKQ1TcGHVVhybDtAf2S6Irz2tui/B4AHCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-01T18:21:15.504759Z"},"content_sha256":"ca5ea14663e7a3a2e81c6912754de6fa7bb2dffc5b54d44dc9821d38c614f0d4","schema_version":"1.0","event_id":"sha256:ca5ea14663e7a3a2e81c6912754de6fa7bb2dffc5b54d44dc9821d38c614f0d4"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:IF2RPQMYBMQTLC4ROYS7DZ7AYB","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The forgotten bright star: Theta Eridani as a millenary stellar transient observed by Hipparchus, Ptolemy and al-Sufi","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["physics.hist-ph"],"primary_cat":"astro-ph.SR","authors_text":"Boaz Katz, Idel Waisberg","submitted_at":"2026-06-29T18:00:19Z","abstract_excerpt":"Theta Eridani is a V=2.9 star that was nonetheless reported as one of the thirteen brightest stars in the night sky by both Ptolemy in his Almagest (137 AD) and by al-Sufi in his The Book of Fixed Stars (964 AD), in addition to being previously referred by Hipparchus (129 BC) as a particularly bright star. The discrepancy between its historical and modern visual magnitude $\\Delta V \\sim 2.7$ is the highest among the $\\sim 1000$ stars in the Almagest. Theta Eridani is actually a triple star system, and here we combine interferometric data from VLTI/PIONIER and VLTI/GRAVITY, spectroscopic data f"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.30748","kind":"arxiv","version":1},"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/2606.30748/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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-01T00:17:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"oDgWO8OiLGq9ZFrlbSOuQl4ZA+IQpFkHqb7zEuaHeWUSIQKEr9Rtc/WUNZ4HFzi8v29F3/fQaKofn5cO9PpnDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-01T18:21:15.505143Z"},"content_sha256":"10c13f66867120697ede0dd31c58f9de4122b9f306846f453b443028aa64b02c","schema_version":"1.0","event_id":"sha256:10c13f66867120697ede0dd31c58f9de4122b9f306846f453b443028aa64b02c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/IF2RPQMYBMQTLC4ROYS7DZ7AYB/bundle.json","state_url":"https://pith.science/pith/IF2RPQMYBMQTLC4ROYS7DZ7AYB/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/IF2RPQMYBMQTLC4ROYS7DZ7AYB/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-07-01T18:21:15Z","links":{"resolver":"https://pith.science/pith/IF2RPQMYBMQTLC4ROYS7DZ7AYB","bundle":"https://pith.science/pith/IF2RPQMYBMQTLC4ROYS7DZ7AYB/bundle.json","state":"https://pith.science/pith/IF2RPQMYBMQTLC4ROYS7DZ7AYB/state.json","well_known_bundle":"https://pith.science/.well-known/pith/IF2RPQMYBMQTLC4ROYS7DZ7AYB/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:IF2RPQMYBMQTLC4ROYS7DZ7AYB","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"ac113f6f19730340a838385030e27116bbe7afb10236b6c8df227c21a5482f2f","cross_cats_sorted":["physics.hist-ph"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2026-06-29T18:00:19Z","title_canon_sha256":"923328820b288fa2b38efb3b07c44aa2b1f81ac86fec22be5e89832f31e152d0"},"schema_version":"1.0","source":{"id":"2606.30748","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2606.30748","created_at":"2026-07-01T00:17:15Z"},{"alias_kind":"arxiv_version","alias_value":"2606.30748v1","created_at":"2026-07-01T00:17:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2606.30748","created_at":"2026-07-01T00:17:15Z"},{"alias_kind":"pith_short_12","alias_value":"IF2RPQMYBMQT","created_at":"2026-07-01T00:17:15Z"},{"alias_kind":"pith_short_16","alias_value":"IF2RPQMYBMQTLC4R","created_at":"2026-07-01T00:17:15Z"},{"alias_kind":"pith_short_8","alias_value":"IF2RPQMY","created_at":"2026-07-01T00:17:15Z"}],"graph_snapshots":[{"event_id":"sha256:10c13f66867120697ede0dd31c58f9de4122b9f306846f453b443028aa64b02c","target":"graph","created_at":"2026-07-01T00:17:15Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2606.30748/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Theta Eridani is a V=2.9 star that was nonetheless reported as one of the thirteen brightest stars in the night sky by both Ptolemy in his Almagest (137 AD) and by al-Sufi in his The Book of Fixed Stars (964 AD), in addition to being previously referred by Hipparchus (129 BC) as a particularly bright star. The discrepancy between its historical and modern visual magnitude $\\Delta V \\sim 2.7$ is the highest among the $\\sim 1000$ stars in the Almagest. Theta Eridani is actually a triple star system, and here we combine interferometric data from VLTI/PIONIER and VLTI/GRAVITY, spectroscopic data f","authors_text":"Boaz Katz, Idel Waisberg","cross_cats":["physics.hist-ph"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2026-06-29T18:00:19Z","title":"The forgotten bright star: Theta Eridani as a millenary stellar transient observed by Hipparchus, Ptolemy and al-Sufi"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.30748","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:ca5ea14663e7a3a2e81c6912754de6fa7bb2dffc5b54d44dc9821d38c614f0d4","target":"record","created_at":"2026-07-01T00:17:15Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"ac113f6f19730340a838385030e27116bbe7afb10236b6c8df227c21a5482f2f","cross_cats_sorted":["physics.hist-ph"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2026-06-29T18:00:19Z","title_canon_sha256":"923328820b288fa2b38efb3b07c44aa2b1f81ac86fec22be5e89832f31e152d0"},"schema_version":"1.0","source":{"id":"2606.30748","kind":"arxiv","version":1}},"canonical_sha256":"417517c1980b21358b917625f1e7e0c06e021cbc642cc3f9919cb4e2fd85852a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"417517c1980b21358b917625f1e7e0c06e021cbc642cc3f9919cb4e2fd85852a","first_computed_at":"2026-07-01T00:17:15.780531Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-01T00:17:15.780531Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"0RWHO9lOj6+7L7xhas1f0Z7YMhmglbC57H+EY64R8yS62SS5l1jQA5/e/wso82DJU8uBhyLsqVv4RZjYyZfOBg==","signature_status":"signed_v1","signed_at":"2026-07-01T00:17:15.780933Z","signed_message":"canonical_sha256_bytes"},"source_id":"2606.30748","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ca5ea14663e7a3a2e81c6912754de6fa7bb2dffc5b54d44dc9821d38c614f0d4","sha256:10c13f66867120697ede0dd31c58f9de4122b9f306846f453b443028aa64b02c"],"state_sha256":"afb4cb4627822f82de65c80cb03dd3e9102ab75f219dac6a82dab72ca9a9ac6d"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xZ6x17QCEpr51MGWZgoW5ASvJpjIaal7+LqU7MRwSQQK6VsIioRoSecdh/jG7RVwlgyp6+Nkk5bGFEs9io1EAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-01T18:21:15.507174Z","bundle_sha256":"ecda5da4ae011df5a72d001f3bc9383ee6d167d810b21b047a1f7273c300c056"}}