{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:JMVJUONQWM67DYFZLZOXPBG62C","short_pith_number":"pith:JMVJUONQ","canonical_record":{"source":{"id":"1310.6306","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2013-10-23T17:50:21Z","cross_cats_sorted":[],"title_canon_sha256":"7bacad6a2c90f53c1486f63fa5262a08c10caddbf4779a4b967d18f40b3972c9","abstract_canon_sha256":"9b4e4f00a6f1f1a248325bd3dfdedb6276c05685f755cf102eada1fa882ab8aa"},"schema_version":"1.0"},"canonical_sha256":"4b2a9a39b0b33df1e0b95e5d7784ded092fb020792d980fc751f640b83880ee0","source":{"kind":"arxiv","id":"1310.6306","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1310.6306","created_at":"2026-05-18T03:09:20Z"},{"alias_kind":"arxiv_version","alias_value":"1310.6306v1","created_at":"2026-05-18T03:09:20Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1310.6306","created_at":"2026-05-18T03:09:20Z"},{"alias_kind":"pith_short_12","alias_value":"JMVJUONQWM67","created_at":"2026-05-18T12:27:49Z"},{"alias_kind":"pith_short_16","alias_value":"JMVJUONQWM67DYFZ","created_at":"2026-05-18T12:27:49Z"},{"alias_kind":"pith_short_8","alias_value":"JMVJUONQ","created_at":"2026-05-18T12:27:49Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:JMVJUONQWM67DYFZLZOXPBG62C","target":"record","payload":{"canonical_record":{"source":{"id":"1310.6306","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2013-10-23T17:50:21Z","cross_cats_sorted":[],"title_canon_sha256":"7bacad6a2c90f53c1486f63fa5262a08c10caddbf4779a4b967d18f40b3972c9","abstract_canon_sha256":"9b4e4f00a6f1f1a248325bd3dfdedb6276c05685f755cf102eada1fa882ab8aa"},"schema_version":"1.0"},"canonical_sha256":"4b2a9a39b0b33df1e0b95e5d7784ded092fb020792d980fc751f640b83880ee0","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:09:20.751281Z","signature_b64":"k8LuUmAGtkgxlgN7UtJEIJvhrmehb5Bmk17A3lF2P4C+7jDTjiP6IIQw4dR3qtYPhSDekgaeHa0ngTL/KCRRBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"4b2a9a39b0b33df1e0b95e5d7784ded092fb020792d980fc751f640b83880ee0","last_reissued_at":"2026-05-18T03:09:20.750431Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:09:20.750431Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1310.6306","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":"2026-05-18T03:09:20Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"D0Xtp8btnIAlxLmN3i+7X7dCQcDccAj+jeqO+rCM3LpYz/EBCgFv41HsJudU/E7pBgOvQANKuxWN46Yf3g84BA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-04T04:11:59.000725Z"},"content_sha256":"25da509faf39ae934b138fac21817929ee88e0bbb627806787d18eebaa13410e","schema_version":"1.0","event_id":"sha256:25da509faf39ae934b138fac21817929ee88e0bbb627806787d18eebaa13410e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:JMVJUONQWM67DYFZLZOXPBG62C","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Amplitude Variations in Pulsating Red Supergiants","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"John R. Percy, Viraja C. Khatu","submitted_at":"2013-10-23T17:50:21Z","abstract_excerpt":"We have used long-term AAVSO visual observations and Fourier and wavelet analysis to identify periods and study long-term amplitude variations in 44 red supergiants. Of these, 12 stars had data which were too sparse and/or had low amplitude and/or were without conspicuous peaks in the Fourier spectrum; 6 stars had only long (2500-4000 days) periods without significant amplitude variation. The other 26 stars had one or two periods, either \"short\" (hundreds of days) or \"long\" (thousands of days), whose amplitudes varied by up to a factor of 8, but more typically 2-4. The median timescale of the "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1310.6306","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":""},"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":"2026-05-18T03:09:20Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"JsdIjmb2wExxwNgvKWINm6V7V+B4yydnRFUlGk9fAZMVrw4AXcESD4gZ1rsX8If1G+N2p2EIapRUiLeXS/cABw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-04T04:11:59.001313Z"},"content_sha256":"e413a4212bca7f544b8738bf506febb140c40947f474e5a696b92d5db3fed9e6","schema_version":"1.0","event_id":"sha256:e413a4212bca7f544b8738bf506febb140c40947f474e5a696b92d5db3fed9e6"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/JMVJUONQWM67DYFZLZOXPBG62C/bundle.json","state_url":"https://pith.science/pith/JMVJUONQWM67DYFZLZOXPBG62C/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/JMVJUONQWM67DYFZLZOXPBG62C/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":"2026-07-04T04:11:59Z","links":{"resolver":"https://pith.science/pith/JMVJUONQWM67DYFZLZOXPBG62C","bundle":"https://pith.science/pith/JMVJUONQWM67DYFZLZOXPBG62C/bundle.json","state":"https://pith.science/pith/JMVJUONQWM67DYFZLZOXPBG62C/state.json","well_known_bundle":"https://pith.science/.well-known/pith/JMVJUONQWM67DYFZLZOXPBG62C/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:JMVJUONQWM67DYFZLZOXPBG62C","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":"9b4e4f00a6f1f1a248325bd3dfdedb6276c05685f755cf102eada1fa882ab8aa","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2013-10-23T17:50:21Z","title_canon_sha256":"7bacad6a2c90f53c1486f63fa5262a08c10caddbf4779a4b967d18f40b3972c9"},"schema_version":"1.0","source":{"id":"1310.6306","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1310.6306","created_at":"2026-05-18T03:09:20Z"},{"alias_kind":"arxiv_version","alias_value":"1310.6306v1","created_at":"2026-05-18T03:09:20Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1310.6306","created_at":"2026-05-18T03:09:20Z"},{"alias_kind":"pith_short_12","alias_value":"JMVJUONQWM67","created_at":"2026-05-18T12:27:49Z"},{"alias_kind":"pith_short_16","alias_value":"JMVJUONQWM67DYFZ","created_at":"2026-05-18T12:27:49Z"},{"alias_kind":"pith_short_8","alias_value":"JMVJUONQ","created_at":"2026-05-18T12:27:49Z"}],"graph_snapshots":[{"event_id":"sha256:e413a4212bca7f544b8738bf506febb140c40947f474e5a696b92d5db3fed9e6","target":"graph","created_at":"2026-05-18T03:09:20Z","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 have used long-term AAVSO visual observations and Fourier and wavelet analysis to identify periods and study long-term amplitude variations in 44 red supergiants. Of these, 12 stars had data which were too sparse and/or had low amplitude and/or were without conspicuous peaks in the Fourier spectrum; 6 stars had only long (2500-4000 days) periods without significant amplitude variation. The other 26 stars had one or two periods, either \"short\" (hundreds of days) or \"long\" (thousands of days), whose amplitudes varied by up to a factor of 8, but more typically 2-4. The median timescale of the ","authors_text":"John R. Percy, Viraja C. Khatu","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2013-10-23T17:50:21Z","title":"Amplitude Variations in Pulsating Red Supergiants"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1310.6306","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":"sha256:25da509faf39ae934b138fac21817929ee88e0bbb627806787d18eebaa13410e","target":"record","created_at":"2026-05-18T03:09:20Z","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":"9b4e4f00a6f1f1a248325bd3dfdedb6276c05685f755cf102eada1fa882ab8aa","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2013-10-23T17:50:21Z","title_canon_sha256":"7bacad6a2c90f53c1486f63fa5262a08c10caddbf4779a4b967d18f40b3972c9"},"schema_version":"1.0","source":{"id":"1310.6306","kind":"arxiv","version":1}},"canonical_sha256":"4b2a9a39b0b33df1e0b95e5d7784ded092fb020792d980fc751f640b83880ee0","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"4b2a9a39b0b33df1e0b95e5d7784ded092fb020792d980fc751f640b83880ee0","first_computed_at":"2026-05-18T03:09:20.750431Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:09:20.750431Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"k8LuUmAGtkgxlgN7UtJEIJvhrmehb5Bmk17A3lF2P4C+7jDTjiP6IIQw4dR3qtYPhSDekgaeHa0ngTL/KCRRBg==","signature_status":"signed_v1","signed_at":"2026-05-18T03:09:20.751281Z","signed_message":"canonical_sha256_bytes"},"source_id":"1310.6306","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:25da509faf39ae934b138fac21817929ee88e0bbb627806787d18eebaa13410e","sha256:e413a4212bca7f544b8738bf506febb140c40947f474e5a696b92d5db3fed9e6"],"state_sha256":"6cb523100e9f23b91ee8653d4b55a3c2a3a0f942357bcfd5ce8b852997a4fc66"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3ngFHxhJdqmDxiIHNFTxvJ3htX0r75PyFYqXyhClvpfg9MYUg8h8huh6mg+HvIib7feM7sQqDsmRMr2etn81AQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-04T04:11:59.004270Z","bundle_sha256":"192660f13defa9dd770de431eb19d8eb33dd5ee6ba39850964e4600d01dfc497"}}