{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:1998:32ZIQWNFRE2TXLCHX3TVMTHVKB","short_pith_number":"pith:32ZIQWNF","canonical_record":{"source":{"id":"astro-ph/9812077","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"1998-12-03T17:20:35Z","cross_cats_sorted":[],"title_canon_sha256":"59e7d2c6d9bff701fc2c3c784713c278ec87ed404b47a7d9a3f8eb45dcf391e2","abstract_canon_sha256":"1e0ac1dffd1019b26080e85897df97dbe23411e3acbdabddd778fb12a9885e4c"},"schema_version":"1.0"},"canonical_sha256":"deb28859a589353bac47bee7564cf5506e32145238952dc7b3a875fe5d1df409","source":{"kind":"arxiv","id":"astro-ph/9812077","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/9812077","created_at":"2026-07-04T14:16:24Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/9812077v1","created_at":"2026-07-04T14:16:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/9812077","created_at":"2026-07-04T14:16:24Z"},{"alias_kind":"pith_short_12","alias_value":"32ZIQWNFRE2T","created_at":"2026-07-04T14:16:24Z"},{"alias_kind":"pith_short_16","alias_value":"32ZIQWNFRE2TXLCH","created_at":"2026-07-04T14:16:24Z"},{"alias_kind":"pith_short_8","alias_value":"32ZIQWNF","created_at":"2026-07-04T14:16:24Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:1998:32ZIQWNFRE2TXLCHX3TVMTHVKB","target":"record","payload":{"canonical_record":{"source":{"id":"astro-ph/9812077","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"1998-12-03T17:20:35Z","cross_cats_sorted":[],"title_canon_sha256":"59e7d2c6d9bff701fc2c3c784713c278ec87ed404b47a7d9a3f8eb45dcf391e2","abstract_canon_sha256":"1e0ac1dffd1019b26080e85897df97dbe23411e3acbdabddd778fb12a9885e4c"},"schema_version":"1.0"},"canonical_sha256":"deb28859a589353bac47bee7564cf5506e32145238952dc7b3a875fe5d1df409","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T14:16:24.748576Z","signature_b64":"axrjtPPWHhYp0sIWXAsiCn+da09OQ1Dns8hWgCB5FjNdaL+XziRBnGKXSmN2JB7DA9BSx3iXAtaiocUP6faJBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"deb28859a589353bac47bee7564cf5506e32145238952dc7b3a875fe5d1df409","last_reissued_at":"2026-07-04T14:16:24.748167Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T14:16:24.748167Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"astro-ph/9812077","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":"2026-07-04T14:16:24Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bohCw+Dm29V57aHUAohhL/Mp2bs4Am6/Ii8FW0JZUD1id8J3n6zVT2UmG7vrsGI0ghI4EPvhExOge4cH3pgwCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-14T13:59:58.415132Z"},"content_sha256":"2eacb70a724a3c319be13e130221c12814be0ef937220f8109bf0849f0a10de2","schema_version":"1.0","event_id":"sha256:2eacb70a724a3c319be13e130221c12814be0ef937220f8109bf0849f0a10de2"},{"event_type":"graph_snapshot","subject_pith_number":"pith:1998:32ZIQWNFRE2TXLCHX3TVMTHVKB","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"An Improved Orbital Ephemeris for Cygnus X-1","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"A.E. Tarasov (CrAO, C. Brocksopp (U Sussex), P. Roche (U Sussex), Russia), Ukraine), V. M. Lyuty (SAI","submitted_at":"1998-12-03T17:20:35Z","abstract_excerpt":"By accumulating all available radial velocity data and combining it with our own spectroscopy we present a new and improved ephemeris for Cygnus X-1 (V1357 Cygni/HDE226868). We initially calculate an orbital period of 5.599847+/-0.000018.days and then, by including the more recent radial velocities of LaSala et al. (1998) and Sowers et al.(1998) we refine this to 5.599829+/-0.000016 days. Using 27 years' worth of photometry, we also calculate a photometric period of 5.599836+/-0.000024 - remarkably similar to the spectroscopic one."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9812077","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/astro-ph/9812077/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":"2026-07-04T14:16:24Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"C6jC71DE8lMmtx+c/eyHUAr7adW9E4D81vyPRRbCEQkgAdobBi8Npkh4C5S1/pKQg0+08qFvO/P20hch12nkBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-14T13:59:58.415736Z"},"content_sha256":"4811140d756e14cae501c86c887c8fd1942eb0518a0e430e9e9256af74077e0f","schema_version":"1.0","event_id":"sha256:4811140d756e14cae501c86c887c8fd1942eb0518a0e430e9e9256af74077e0f"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/32ZIQWNFRE2TXLCHX3TVMTHVKB/bundle.json","state_url":"https://pith.science/pith/32ZIQWNFRE2TXLCHX3TVMTHVKB/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/32ZIQWNFRE2TXLCHX3TVMTHVKB/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":"2026-08-14T13:59:58Z","links":{"resolver":"https://pith.science/pith/32ZIQWNFRE2TXLCHX3TVMTHVKB","bundle":"https://pith.science/pith/32ZIQWNFRE2TXLCHX3TVMTHVKB/bundle.json","state":"https://pith.science/pith/32ZIQWNFRE2TXLCHX3TVMTHVKB/state.json","well_known_bundle":"https://pith.science/.well-known/pith/32ZIQWNFRE2TXLCHX3TVMTHVKB/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:1998:32ZIQWNFRE2TXLCHX3TVMTHVKB","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":"1e0ac1dffd1019b26080e85897df97dbe23411e3acbdabddd778fb12a9885e4c","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"1998-12-03T17:20:35Z","title_canon_sha256":"59e7d2c6d9bff701fc2c3c784713c278ec87ed404b47a7d9a3f8eb45dcf391e2"},"schema_version":"1.0","source":{"id":"astro-ph/9812077","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/9812077","created_at":"2026-07-04T14:16:24Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/9812077v1","created_at":"2026-07-04T14:16:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/9812077","created_at":"2026-07-04T14:16:24Z"},{"alias_kind":"pith_short_12","alias_value":"32ZIQWNFRE2T","created_at":"2026-07-04T14:16:24Z"},{"alias_kind":"pith_short_16","alias_value":"32ZIQWNFRE2TXLCH","created_at":"2026-07-04T14:16:24Z"},{"alias_kind":"pith_short_8","alias_value":"32ZIQWNF","created_at":"2026-07-04T14:16:24Z"}],"graph_snapshots":[{"event_id":"sha256:4811140d756e14cae501c86c887c8fd1942eb0518a0e430e9e9256af74077e0f","target":"graph","created_at":"2026-07-04T14:16:24Z","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/astro-ph/9812077/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"By accumulating all available radial velocity data and combining it with our own spectroscopy we present a new and improved ephemeris for Cygnus X-1 (V1357 Cygni/HDE226868). We initially calculate an orbital period of 5.599847+/-0.000018.days and then, by including the more recent radial velocities of LaSala et al. (1998) and Sowers et al.(1998) we refine this to 5.599829+/-0.000016 days. Using 27 years' worth of photometry, we also calculate a photometric period of 5.599836+/-0.000024 - remarkably similar to the spectroscopic one.","authors_text":"A.E. Tarasov (CrAO, C. Brocksopp (U Sussex), P. Roche (U Sussex), Russia), Ukraine), V. M. Lyuty (SAI","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"1998-12-03T17:20:35Z","title":"An Improved Orbital Ephemeris for Cygnus X-1"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9812077","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":"sha256:2eacb70a724a3c319be13e130221c12814be0ef937220f8109bf0849f0a10de2","target":"record","created_at":"2026-07-04T14:16:24Z","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":"1e0ac1dffd1019b26080e85897df97dbe23411e3acbdabddd778fb12a9885e4c","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"1998-12-03T17:20:35Z","title_canon_sha256":"59e7d2c6d9bff701fc2c3c784713c278ec87ed404b47a7d9a3f8eb45dcf391e2"},"schema_version":"1.0","source":{"id":"astro-ph/9812077","kind":"arxiv","version":1}},"canonical_sha256":"deb28859a589353bac47bee7564cf5506e32145238952dc7b3a875fe5d1df409","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"deb28859a589353bac47bee7564cf5506e32145238952dc7b3a875fe5d1df409","first_computed_at":"2026-07-04T14:16:24.748167Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T14:16:24.748167Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"axrjtPPWHhYp0sIWXAsiCn+da09OQ1Dns8hWgCB5FjNdaL+XziRBnGKXSmN2JB7DA9BSx3iXAtaiocUP6faJBw==","signature_status":"signed_v1","signed_at":"2026-07-04T14:16:24.748576Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/9812077","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2eacb70a724a3c319be13e130221c12814be0ef937220f8109bf0849f0a10de2","sha256:4811140d756e14cae501c86c887c8fd1942eb0518a0e430e9e9256af74077e0f"],"state_sha256":"85f624a510a2684745a2cc4d31e25c72c242d052feffd6a36a1a19748c52ab0e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fLhnCU/8/UXlY0t0efKdVAb+dEFfFimaQnu9ZooLxTPK8c4MqFa9muXlZtw06QYqrHQ0kuriFwgm/cbpp4UtCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-14T13:59:58.421716Z","bundle_sha256":"a70d1747357f3c3a4032a02873e5d9b13fa719b874af0aa189b88d7ab6190c79"}}