{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:1999:TIQ4A46WVZPKN3N4U32DR7F4ZA","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":"30fd91feb2633821aede7a92399cde6e0d1b9ca4e5f3d90cbfc9b56c7d57b707","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"1999-12-09T23:56:24Z","title_canon_sha256":"da3d4fb45f6a63f3cf51542e2ca10a137fb8a541e190c0613f8306bb3a0fd4db"},"schema_version":"1.0","source":{"id":"astro-ph/9912213","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/9912213","created_at":"2026-05-18T03:33:48Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/9912213v2","created_at":"2026-05-18T03:33:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/9912213","created_at":"2026-05-18T03:33:48Z"},{"alias_kind":"pith_short_12","alias_value":"TIQ4A46WVZPK","created_at":"2026-05-18T12:25:49Z"},{"alias_kind":"pith_short_16","alias_value":"TIQ4A46WVZPKN3N4","created_at":"2026-05-18T12:25:49Z"},{"alias_kind":"pith_short_8","alias_value":"TIQ4A46W","created_at":"2026-05-18T12:25:49Z"}],"graph_snapshots":[{"event_id":"sha256:64a68f7a97ea72d962378ab8ab413182d1efbe46c907e2bbe2bc0d64eb4aeea1","target":"graph","created_at":"2026-05-18T03:33:48Z","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"},"paper":{"abstract_excerpt":"Using simultaneous observations of the MDI and EIT instruments on board the SoHO spacecraft, we determined in flight the plate scale of the EIT. We found a value of 2.629+-0.001 arc seconds per pixel, in fair agreement with the 2.627+-0.001 arc seconds per pixel value deduced from recent laboratory measurements of the focal length, and much higher by 7 sigma than the 2.622 arc seconds per pixel value of the pre-flight calibrations. The plate scale is found to be constant across the field of view, confirming the negligible distortion level predicted by the theoretical models of the EIT. Further","authors_text":"C. E. DeForest, F. Auchere, G. Artzner","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"1999-12-09T23:56:24Z","title":"In Flight Determination of the Plate Scale of the EIT"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9912213","kind":"arxiv","version":2},"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:c297030b5c7a3a5f6fd0dbc31eec522f555c02e1cc1ca618a94a89550a6368b3","target":"record","created_at":"2026-05-18T03:33:48Z","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":"30fd91feb2633821aede7a92399cde6e0d1b9ca4e5f3d90cbfc9b56c7d57b707","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"1999-12-09T23:56:24Z","title_canon_sha256":"da3d4fb45f6a63f3cf51542e2ca10a137fb8a541e190c0613f8306bb3a0fd4db"},"schema_version":"1.0","source":{"id":"astro-ph/9912213","kind":"arxiv","version":2}},"canonical_sha256":"9a21c073d6ae5ea6edbca6f438fcbcc8009e4b6f2a7d71e837c68e55cc198851","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"9a21c073d6ae5ea6edbca6f438fcbcc8009e4b6f2a7d71e837c68e55cc198851","first_computed_at":"2026-05-18T03:33:48.359605Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:33:48.359605Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"4CFM8Yp6jb8y2zJcbDQPGxwcnC8suBSm58sQhURkvQHhEGJ794P9+1bJ0C1GaJ4WTqUKkXx8tZq6vhWLKDfwAw==","signature_status":"signed_v1","signed_at":"2026-05-18T03:33:48.360361Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/9912213","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c297030b5c7a3a5f6fd0dbc31eec522f555c02e1cc1ca618a94a89550a6368b3","sha256:64a68f7a97ea72d962378ab8ab413182d1efbe46c907e2bbe2bc0d64eb4aeea1"],"state_sha256":"72aca7908af4b84e53691042cc299ce18167137cd2970223b6e97a163373948a"}