{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:UE5TX6PGPU2IELHCDP4W7YPTHM","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":"bf95b957821ad13e5513a9d7546b451fcae168000ed4465a4d9cafbcf9010179","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-09-04T10:44:06Z","title_canon_sha256":"6ab3ab82f444db7adfc4f37726ff390828096dd331fa9b8d4c9b14d410029cb0"},"schema_version":"1.0","source":{"id":"1009.0822","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1009.0822","created_at":"2026-05-18T02:05:36Z"},{"alias_kind":"arxiv_version","alias_value":"1009.0822v1","created_at":"2026-05-18T02:05:36Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1009.0822","created_at":"2026-05-18T02:05:36Z"},{"alias_kind":"pith_short_12","alias_value":"UE5TX6PGPU2I","created_at":"2026-05-18T12:26:15Z"},{"alias_kind":"pith_short_16","alias_value":"UE5TX6PGPU2IELHC","created_at":"2026-05-18T12:26:15Z"},{"alias_kind":"pith_short_8","alias_value":"UE5TX6PG","created_at":"2026-05-18T12:26:15Z"}],"graph_snapshots":[{"event_id":"sha256:4bd33c8f373d2e2cd831f688e495b0b12930d9a96f82cb2ec2305d970f366a65","target":"graph","created_at":"2026-05-18T02:05:36Z","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":"The photometric and spectroscopic evolution of the He/N and very fast Nova Cyg 2008 N2 (V2491 Cyg) is studied in detail. A primary maximum was reached at V=7.45 +/-0.05 on April 11.37 (+/-0.1) 2008 UT, followed by a smooth decline characterized by t2(V)=4.8 days, and then a second maximum was attained at V=9.49 +/-0.03, 14.5 days after the primary one. This is the only third nova to have displayed a secondary maximum, after V2362 Cyg and V1493 Aql. The development and energetics of the secondary maximum is studied in detail. The smooth decline that followed was accurately monitored until day +","authors_text":"A. Siviero, G. Cherini, L. Tomasella, P. Valisa, S. Dallaporta, U. Munari","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-09-04T10:44:06Z","title":"An extensive optical study of V2491 Cyg (Nova Cyg 2008 N.2), from maximum brightness to return to quiescence"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1009.0822","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:f67df7a0a38519d190722e5bade7ea4c69eb6f3c14345a611e08238846299711","target":"record","created_at":"2026-05-18T02:05:36Z","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":"bf95b957821ad13e5513a9d7546b451fcae168000ed4465a4d9cafbcf9010179","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-09-04T10:44:06Z","title_canon_sha256":"6ab3ab82f444db7adfc4f37726ff390828096dd331fa9b8d4c9b14d410029cb0"},"schema_version":"1.0","source":{"id":"1009.0822","kind":"arxiv","version":1}},"canonical_sha256":"a13b3bf9e67d34822ce21bf96fe1f33b1727fde9cc81fe8700c2d61eee151801","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a13b3bf9e67d34822ce21bf96fe1f33b1727fde9cc81fe8700c2d61eee151801","first_computed_at":"2026-05-18T02:05:36.908216Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:05:36.908216Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"SONSzUS50u1WpUVzTf+uQhCPq9hMcgvf7UqRfFNeVFE4ppb5+Jph2q2XSJiieTHnFklGmWeOXr2Muka3Bg0uCQ==","signature_status":"signed_v1","signed_at":"2026-05-18T02:05:36.909083Z","signed_message":"canonical_sha256_bytes"},"source_id":"1009.0822","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f67df7a0a38519d190722e5bade7ea4c69eb6f3c14345a611e08238846299711","sha256:4bd33c8f373d2e2cd831f688e495b0b12930d9a96f82cb2ec2305d970f366a65"],"state_sha256":"2534d0fbb1b41b9192a94bf82f69cbc06a25f0bae296db56f966fe17242592cb"}