{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2010:C6ALA3KJL3OGYICX575FGT3GII","short_pith_number":"pith:C6ALA3KJ","canonical_record":{"source":{"id":"1008.4478","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-08-26T11:24:30Z","cross_cats_sorted":[],"title_canon_sha256":"ee14d5aaf415b1effcb9d88f2da21d2598e27d586d655d3c27ce313659b53120","abstract_canon_sha256":"8ab2a5cff1233f2b4af476810a9770bc2900c3b69edaf908e8d6d3278024c3f2"},"schema_version":"1.0"},"canonical_sha256":"1780b06d495edc6c2057effa534f664206789f1e9c571633f4f60f0afd79a3f7","source":{"kind":"arxiv","id":"1008.4478","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1008.4478","created_at":"2026-05-18T02:05:42Z"},{"alias_kind":"arxiv_version","alias_value":"1008.4478v1","created_at":"2026-05-18T02:05:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1008.4478","created_at":"2026-05-18T02:05:42Z"},{"alias_kind":"pith_short_12","alias_value":"C6ALA3KJL3OG","created_at":"2026-05-18T12:26:05Z"},{"alias_kind":"pith_short_16","alias_value":"C6ALA3KJL3OGYICX","created_at":"2026-05-18T12:26:05Z"},{"alias_kind":"pith_short_8","alias_value":"C6ALA3KJ","created_at":"2026-05-18T12:26:05Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2010:C6ALA3KJL3OGYICX575FGT3GII","target":"record","payload":{"canonical_record":{"source":{"id":"1008.4478","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-08-26T11:24:30Z","cross_cats_sorted":[],"title_canon_sha256":"ee14d5aaf415b1effcb9d88f2da21d2598e27d586d655d3c27ce313659b53120","abstract_canon_sha256":"8ab2a5cff1233f2b4af476810a9770bc2900c3b69edaf908e8d6d3278024c3f2"},"schema_version":"1.0"},"canonical_sha256":"1780b06d495edc6c2057effa534f664206789f1e9c571633f4f60f0afd79a3f7","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:05:42.526900Z","signature_b64":"xowhNrLsmFVULCav1qP3KLV1NoskYtE7jl4abPlfN66PPVydmi47UtSVGwuzfXFvXsHy6HgAOyvwowIUyq+zCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"1780b06d495edc6c2057effa534f664206789f1e9c571633f4f60f0afd79a3f7","last_reissued_at":"2026-05-18T02:05:42.526226Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:05:42.526226Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1008.4478","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":"2026-05-18T02:05:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"XmSLP1O4QLroSJfztCl8yee/9X5kf0STbt1Rz/I42yTetlMs0HuohkdWjQoEOpPZe8vZcEVcu3QhbskK3rdLBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-07T11:47:35.937392Z"},"content_sha256":"5e0386c1de66b556f701350ee5dcfbd22c11d8c9041f0b3a416e578efb783f91","schema_version":"1.0","event_id":"sha256:5e0386c1de66b556f701350ee5dcfbd22c11d8c9041f0b3a416e578efb783f91"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2010:C6ALA3KJL3OGYICX575FGT3GII","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The peculiar Horizontal Branch of NGC 2808","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"B. Lanzoni (1), E. Dalessandro (1), E. Sabbi (6) ((1) Astronomy Department - University of Bologna (2) Astrophysics Research Institute - Liverpool John Moores University (3) INAF - Osservatorio Astronomico di Collurania (4) Astronomy Department - University of Virginia (5) INAF - Osservatorio Astronomico di Bologna (6) Space Telescope Science Institute), F. Fusi Pecci (5), F. R. Ferraro (1), M. Salaris (2), R. T. Rood (4), S. Cassisi (3)","submitted_at":"2010-08-26T11:24:30Z","abstract_excerpt":"We present an accurate analysis of the peculiar Horizontal Branch (HB) of the massive Galactic globular cluster NGC 2808, based on high-resolution far-UV and optical images of the central region of the cluster obtained with HST. We confirm the multimodal distribution of stars along the HB: 4 sub-populations separated by gaps are distinguishable. The detailed comparison with suitable theoretical models showed that (i) it is not possible to reproduce the luminosity of the entire HB with a single helium abundance, while an appropriate modeling is possible for three HB groups by assuming different"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1008.4478","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":"2026-05-18T02:05:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"84G82pmmaXB9dMOpojgZh5+h49S5CRQomScgt1dmH/PZHqXu9jQAT6+1ly8cQ+qFo/avlhdpgUjn5Vd5/l2XAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-07T11:47:35.938076Z"},"content_sha256":"7018fd6ea083676587e5ebc8271300f336b956bf7f19530ed05bf6dc867df1be","schema_version":"1.0","event_id":"sha256:7018fd6ea083676587e5ebc8271300f336b956bf7f19530ed05bf6dc867df1be"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/C6ALA3KJL3OGYICX575FGT3GII/bundle.json","state_url":"https://pith.science/pith/C6ALA3KJL3OGYICX575FGT3GII/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/C6ALA3KJL3OGYICX575FGT3GII/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":"2026-06-07T11:47:35Z","links":{"resolver":"https://pith.science/pith/C6ALA3KJL3OGYICX575FGT3GII","bundle":"https://pith.science/pith/C6ALA3KJL3OGYICX575FGT3GII/bundle.json","state":"https://pith.science/pith/C6ALA3KJL3OGYICX575FGT3GII/state.json","well_known_bundle":"https://pith.science/.well-known/pith/C6ALA3KJL3OGYICX575FGT3GII/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:C6ALA3KJL3OGYICX575FGT3GII","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":"8ab2a5cff1233f2b4af476810a9770bc2900c3b69edaf908e8d6d3278024c3f2","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-08-26T11:24:30Z","title_canon_sha256":"ee14d5aaf415b1effcb9d88f2da21d2598e27d586d655d3c27ce313659b53120"},"schema_version":"1.0","source":{"id":"1008.4478","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1008.4478","created_at":"2026-05-18T02:05:42Z"},{"alias_kind":"arxiv_version","alias_value":"1008.4478v1","created_at":"2026-05-18T02:05:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1008.4478","created_at":"2026-05-18T02:05:42Z"},{"alias_kind":"pith_short_12","alias_value":"C6ALA3KJL3OG","created_at":"2026-05-18T12:26:05Z"},{"alias_kind":"pith_short_16","alias_value":"C6ALA3KJL3OGYICX","created_at":"2026-05-18T12:26:05Z"},{"alias_kind":"pith_short_8","alias_value":"C6ALA3KJ","created_at":"2026-05-18T12:26:05Z"}],"graph_snapshots":[{"event_id":"sha256:7018fd6ea083676587e5ebc8271300f336b956bf7f19530ed05bf6dc867df1be","target":"graph","created_at":"2026-05-18T02:05:42Z","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 an accurate analysis of the peculiar Horizontal Branch (HB) of the massive Galactic globular cluster NGC 2808, based on high-resolution far-UV and optical images of the central region of the cluster obtained with HST. We confirm the multimodal distribution of stars along the HB: 4 sub-populations separated by gaps are distinguishable. The detailed comparison with suitable theoretical models showed that (i) it is not possible to reproduce the luminosity of the entire HB with a single helium abundance, while an appropriate modeling is possible for three HB groups by assuming different","authors_text":"B. Lanzoni (1), E. Dalessandro (1), E. Sabbi (6) ((1) Astronomy Department - University of Bologna (2) Astrophysics Research Institute - Liverpool John Moores University (3) INAF - Osservatorio Astronomico di Collurania (4) Astronomy Department - University of Virginia (5) INAF - Osservatorio Astronomico di Bologna (6) Space Telescope Science Institute), F. Fusi Pecci (5), F. R. Ferraro (1), M. Salaris (2), R. T. Rood (4), S. Cassisi (3)","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-08-26T11:24:30Z","title":"The peculiar Horizontal Branch of NGC 2808"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1008.4478","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":"sha256:5e0386c1de66b556f701350ee5dcfbd22c11d8c9041f0b3a416e578efb783f91","target":"record","created_at":"2026-05-18T02:05:42Z","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":"8ab2a5cff1233f2b4af476810a9770bc2900c3b69edaf908e8d6d3278024c3f2","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-08-26T11:24:30Z","title_canon_sha256":"ee14d5aaf415b1effcb9d88f2da21d2598e27d586d655d3c27ce313659b53120"},"schema_version":"1.0","source":{"id":"1008.4478","kind":"arxiv","version":1}},"canonical_sha256":"1780b06d495edc6c2057effa534f664206789f1e9c571633f4f60f0afd79a3f7","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"1780b06d495edc6c2057effa534f664206789f1e9c571633f4f60f0afd79a3f7","first_computed_at":"2026-05-18T02:05:42.526226Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:05:42.526226Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"xowhNrLsmFVULCav1qP3KLV1NoskYtE7jl4abPlfN66PPVydmi47UtSVGwuzfXFvXsHy6HgAOyvwowIUyq+zCg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:05:42.526900Z","signed_message":"canonical_sha256_bytes"},"source_id":"1008.4478","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:5e0386c1de66b556f701350ee5dcfbd22c11d8c9041f0b3a416e578efb783f91","sha256:7018fd6ea083676587e5ebc8271300f336b956bf7f19530ed05bf6dc867df1be"],"state_sha256":"37a365901f43ed80b6a3e09f13ffe1f6fceb693dd4bf179428a0e423fd02c1c8"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"jw+wndlyS8dpJCYlZZm6Cn/Xw02yBWgLmGeUnXVtaFiICoW3wDSLWzi/M2wWgYW8zqQaXtZxVl17pU94t7G6Bg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-07T11:47:35.941615Z","bundle_sha256":"ae70a2aae42281a23d73223fb7568151a4bbf9119f072a80e90c0052096e2f7b"}}