{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:M5XCHZR2ZYC76RNURZC2OVKWAG","short_pith_number":"pith:M5XCHZR2","canonical_record":{"source":{"id":"1207.2907","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-07-12T10:32:12Z","cross_cats_sorted":[],"title_canon_sha256":"c282bb5e3d0d54fe153fde23cddd3860000f40e0027afc248a3bd98f32a296dd","abstract_canon_sha256":"f5d980ddc3d391614ed1c39a9fb76d7eae26a00aea1c0d79ba9b3e605a94a6d5"},"schema_version":"1.0"},"canonical_sha256":"676e23e63ace05ff45b48e45a7555601a4ab69cc21cbffead74bae49a029a957","source":{"kind":"arxiv","id":"1207.2907","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1207.2907","created_at":"2026-05-18T01:56:24Z"},{"alias_kind":"arxiv_version","alias_value":"1207.2907v2","created_at":"2026-05-18T01:56:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1207.2907","created_at":"2026-05-18T01:56:24Z"},{"alias_kind":"pith_short_12","alias_value":"M5XCHZR2ZYC7","created_at":"2026-05-18T12:27:14Z"},{"alias_kind":"pith_short_16","alias_value":"M5XCHZR2ZYC76RNU","created_at":"2026-05-18T12:27:14Z"},{"alias_kind":"pith_short_8","alias_value":"M5XCHZR2","created_at":"2026-05-18T12:27:14Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:M5XCHZR2ZYC76RNURZC2OVKWAG","target":"record","payload":{"canonical_record":{"source":{"id":"1207.2907","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-07-12T10:32:12Z","cross_cats_sorted":[],"title_canon_sha256":"c282bb5e3d0d54fe153fde23cddd3860000f40e0027afc248a3bd98f32a296dd","abstract_canon_sha256":"f5d980ddc3d391614ed1c39a9fb76d7eae26a00aea1c0d79ba9b3e605a94a6d5"},"schema_version":"1.0"},"canonical_sha256":"676e23e63ace05ff45b48e45a7555601a4ab69cc21cbffead74bae49a029a957","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:56:24.521687Z","signature_b64":"1jyMvvkb1hEwlge+H71q2JYI6bABvnYA0keVd5MNU1fq+juOnZ4tqZ098E+/7epYrtQhtmjnGxMhDHA9tvgfAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"676e23e63ace05ff45b48e45a7555601a4ab69cc21cbffead74bae49a029a957","last_reissued_at":"2026-05-18T01:56:24.520923Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:56:24.520923Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1207.2907","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:56:24Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"tPm90nCAOXd9e0j+/+a9l3dhwCsg733l7GZirwQYkv1Fxe5O12qkvTmv0CVi5SJM16YGYNvFtOtIGoTf+5qVAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T02:39:53.223844Z"},"content_sha256":"2d7e5e37d21871597d4af765fa605c38e9bad9aabb8730c27d5b2e7f5a73e4e9","schema_version":"1.0","event_id":"sha256:2d7e5e37d21871597d4af765fa605c38e9bad9aabb8730c27d5b2e7f5a73e4e9"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:M5XCHZR2ZYC76RNURZC2OVKWAG","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Period and light curve fluctuations of the Kepler Cepheid V1154 Cyg","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"A. Derekas, Gy. M. Szabo, J. C. Smith, J. M. Nemec, K. Kinemuchi, L. Berdnikov, L. L. Kiss, L. Szabados, M. Chadid, N. R. Evans, P. Tenenbaum, R. Smolec, R. Szabo, S. E. Seader","submitted_at":"2012-07-12T10:32:12Z","abstract_excerpt":"We present a detailed period analysis of the bright Cepheid-type variable star V1154 Cygni (V =9.1 mag, P~4.9 d) based on almost 600 days of continuous observations by the Kepler space telescope. The data reveal significant cycle-to-cycle fluctuations in the pulsation period, indicating that classical Cepheids may not be as accurate astrophysical clocks as commonly believed: regardless of the specific points used to determine the O-C values, the cycle lengths show a scatter of 0.015-0.02 days over the 120 cycles covered by the observations. A very slight correlation between the individual Four"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1207.2907","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"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":"2026-05-18T01:56:24Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"kofi3Z8/F34zcRrg8VWPj4Rkmm3If4e1n2IEuGd0pNl+YJwCGldk7cYP73xcRE40qz3+Lduxv7qnIPsXKBOEBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T02:39:53.224516Z"},"content_sha256":"61b413f3e5f0b3f7d8719b4a5e5cd8c790a25fc0464d36087f2aeb39bd51927c","schema_version":"1.0","event_id":"sha256:61b413f3e5f0b3f7d8719b4a5e5cd8c790a25fc0464d36087f2aeb39bd51927c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/M5XCHZR2ZYC76RNURZC2OVKWAG/bundle.json","state_url":"https://pith.science/pith/M5XCHZR2ZYC76RNURZC2OVKWAG/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/M5XCHZR2ZYC76RNURZC2OVKWAG/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":"2026-05-26T02:39:53Z","links":{"resolver":"https://pith.science/pith/M5XCHZR2ZYC76RNURZC2OVKWAG","bundle":"https://pith.science/pith/M5XCHZR2ZYC76RNURZC2OVKWAG/bundle.json","state":"https://pith.science/pith/M5XCHZR2ZYC76RNURZC2OVKWAG/state.json","well_known_bundle":"https://pith.science/.well-known/pith/M5XCHZR2ZYC76RNURZC2OVKWAG/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:M5XCHZR2ZYC76RNURZC2OVKWAG","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":"f5d980ddc3d391614ed1c39a9fb76d7eae26a00aea1c0d79ba9b3e605a94a6d5","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-07-12T10:32:12Z","title_canon_sha256":"c282bb5e3d0d54fe153fde23cddd3860000f40e0027afc248a3bd98f32a296dd"},"schema_version":"1.0","source":{"id":"1207.2907","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1207.2907","created_at":"2026-05-18T01:56:24Z"},{"alias_kind":"arxiv_version","alias_value":"1207.2907v2","created_at":"2026-05-18T01:56:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1207.2907","created_at":"2026-05-18T01:56:24Z"},{"alias_kind":"pith_short_12","alias_value":"M5XCHZR2ZYC7","created_at":"2026-05-18T12:27:14Z"},{"alias_kind":"pith_short_16","alias_value":"M5XCHZR2ZYC76RNU","created_at":"2026-05-18T12:27:14Z"},{"alias_kind":"pith_short_8","alias_value":"M5XCHZR2","created_at":"2026-05-18T12:27:14Z"}],"graph_snapshots":[{"event_id":"sha256:61b413f3e5f0b3f7d8719b4a5e5cd8c790a25fc0464d36087f2aeb39bd51927c","target":"graph","created_at":"2026-05-18T01:56:24Z","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"},"paper":{"abstract_excerpt":"We present a detailed period analysis of the bright Cepheid-type variable star V1154 Cygni (V =9.1 mag, P~4.9 d) based on almost 600 days of continuous observations by the Kepler space telescope. The data reveal significant cycle-to-cycle fluctuations in the pulsation period, indicating that classical Cepheids may not be as accurate astrophysical clocks as commonly believed: regardless of the specific points used to determine the O-C values, the cycle lengths show a scatter of 0.015-0.02 days over the 120 cycles covered by the observations. A very slight correlation between the individual Four","authors_text":"A. Derekas, Gy. M. Szabo, J. C. Smith, J. M. Nemec, K. Kinemuchi, L. Berdnikov, L. L. Kiss, L. Szabados, M. Chadid, N. R. Evans, P. Tenenbaum, R. Smolec, R. Szabo, S. E. Seader","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-07-12T10:32:12Z","title":"Period and light curve fluctuations of the Kepler Cepheid V1154 Cyg"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1207.2907","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":"sha256:2d7e5e37d21871597d4af765fa605c38e9bad9aabb8730c27d5b2e7f5a73e4e9","target":"record","created_at":"2026-05-18T01:56:24Z","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":"f5d980ddc3d391614ed1c39a9fb76d7eae26a00aea1c0d79ba9b3e605a94a6d5","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-07-12T10:32:12Z","title_canon_sha256":"c282bb5e3d0d54fe153fde23cddd3860000f40e0027afc248a3bd98f32a296dd"},"schema_version":"1.0","source":{"id":"1207.2907","kind":"arxiv","version":2}},"canonical_sha256":"676e23e63ace05ff45b48e45a7555601a4ab69cc21cbffead74bae49a029a957","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"676e23e63ace05ff45b48e45a7555601a4ab69cc21cbffead74bae49a029a957","first_computed_at":"2026-05-18T01:56:24.520923Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:56:24.520923Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"1jyMvvkb1hEwlge+H71q2JYI6bABvnYA0keVd5MNU1fq+juOnZ4tqZ098E+/7epYrtQhtmjnGxMhDHA9tvgfAg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:56:24.521687Z","signed_message":"canonical_sha256_bytes"},"source_id":"1207.2907","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2d7e5e37d21871597d4af765fa605c38e9bad9aabb8730c27d5b2e7f5a73e4e9","sha256:61b413f3e5f0b3f7d8719b4a5e5cd8c790a25fc0464d36087f2aeb39bd51927c"],"state_sha256":"349508e994bed20d6dbf7a12394cd652020fe062c5877624f3372105a609053d"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Z65SJ490hN8yfIIGC04riDv/oU8Qz2E+8nQrgEUZN+GFy2sCoKIYsG5phk+qAl0AENGRHi7zrVl7W8tFGaNtBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T02:39:53.228278Z","bundle_sha256":"62e933e29f38ba6da367b8a11fdeccd0f8ba464de9bad08e7d01c81c048dd6eb"}}