{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:D3QA2C7P7Z6LLH3RHY25O6VAI2","short_pith_number":"pith:D3QA2C7P","canonical_record":{"source":{"id":"1401.1931","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2014-01-09T09:09:06Z","cross_cats_sorted":[],"title_canon_sha256":"3236623b1fc90262310338f7eeed8370cd17eeadddf1401aadb6fe00018e71c6","abstract_canon_sha256":"6d8b3fabf07d8736b1f0c6bb6694fb8a36bde082dc6a4704e4b723911358209c"},"schema_version":"1.0"},"canonical_sha256":"1ee00d0beffe7cb59f713e35d77aa0468ccccd22d40a90de0d4c7622e89015fd","source":{"kind":"arxiv","id":"1401.1931","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1401.1931","created_at":"2026-05-18T01:45:27Z"},{"alias_kind":"arxiv_version","alias_value":"1401.1931v1","created_at":"2026-05-18T01:45:27Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1401.1931","created_at":"2026-05-18T01:45:27Z"},{"alias_kind":"pith_short_12","alias_value":"D3QA2C7P7Z6L","created_at":"2026-05-18T12:28:25Z"},{"alias_kind":"pith_short_16","alias_value":"D3QA2C7P7Z6LLH3R","created_at":"2026-05-18T12:28:25Z"},{"alias_kind":"pith_short_8","alias_value":"D3QA2C7P","created_at":"2026-05-18T12:28:25Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:D3QA2C7P7Z6LLH3RHY25O6VAI2","target":"record","payload":{"canonical_record":{"source":{"id":"1401.1931","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2014-01-09T09:09:06Z","cross_cats_sorted":[],"title_canon_sha256":"3236623b1fc90262310338f7eeed8370cd17eeadddf1401aadb6fe00018e71c6","abstract_canon_sha256":"6d8b3fabf07d8736b1f0c6bb6694fb8a36bde082dc6a4704e4b723911358209c"},"schema_version":"1.0"},"canonical_sha256":"1ee00d0beffe7cb59f713e35d77aa0468ccccd22d40a90de0d4c7622e89015fd","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:45:27.244611Z","signature_b64":"6CQRYxjfY5IeAm1wWUnvjNcxFtuPlW4AawMDJhcd9Iaq8qp0ecpn2l3L9fTjW93MRjLsFso/cNeeDPc/dAoRDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"1ee00d0beffe7cb59f713e35d77aa0468ccccd22d40a90de0d4c7622e89015fd","last_reissued_at":"2026-05-18T01:45:27.244178Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:45:27.244178Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1401.1931","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":"2026-05-18T01:45:27Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"t6MG/18BaJm0+3tArAciPMYGpzt4A3LTa/U5U3P8n8ISjFpMhbZ0k12yejBJQakAe25/xM/S8hrxt37OpL5jAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T04:14:16.679019Z"},"content_sha256":"a17dd9edc99592bc17017dae0e0061f2575ac0ea1b6737ef5149b01137c7f084","schema_version":"1.0","event_id":"sha256:a17dd9edc99592bc17017dae0e0061f2575ac0ea1b6737ef5149b01137c7f084"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:D3QA2C7P7Z6LLH3RHY25O6VAI2","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A successful search for hidden Barbarians in the Watsonia asteroid family","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.EP","authors_text":"A. Cellino, B. Novakovic, M. Delbo`, P. Tanga, S. Bagnulo","submitted_at":"2014-01-09T09:09:06Z","abstract_excerpt":"Barbarians, so named after the prototype of this class (234) Barbara, are a rare class of asteroids exhibiting anomalous polarimetric properties. Their very distinctive feature is that they show negative polarization at relatively large phase-angles, where all 'normal' asteroids show positive polarization. The origin of the Barbarian phenomenon is unclear, but it seems to be correlated with the presence of anomalous abundances of spinel, a mineral usually associated with the so-called Calcium Aluminum-rich inclusions (CAIs) on meteorites. Since CAIs are samples of the oldest solid matter ident"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1401.1931","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":"2026-05-18T01:45:27Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"iWWRXLjSb1elJXoKWmUyrJlQGqt4dPgcZJn6LK90Zm6MRuDsKqj3fQZhy2uE6C69NzzXSuqpzwoV1GFZARM+Bg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T04:14:16.679742Z"},"content_sha256":"0fb168c8348b784b3274725053b685de34e4e936a2269ad4c054b18c212061ce","schema_version":"1.0","event_id":"sha256:0fb168c8348b784b3274725053b685de34e4e936a2269ad4c054b18c212061ce"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/D3QA2C7P7Z6LLH3RHY25O6VAI2/bundle.json","state_url":"https://pith.science/pith/D3QA2C7P7Z6LLH3RHY25O6VAI2/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/D3QA2C7P7Z6LLH3RHY25O6VAI2/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":"2026-05-26T04:14:16Z","links":{"resolver":"https://pith.science/pith/D3QA2C7P7Z6LLH3RHY25O6VAI2","bundle":"https://pith.science/pith/D3QA2C7P7Z6LLH3RHY25O6VAI2/bundle.json","state":"https://pith.science/pith/D3QA2C7P7Z6LLH3RHY25O6VAI2/state.json","well_known_bundle":"https://pith.science/.well-known/pith/D3QA2C7P7Z6LLH3RHY25O6VAI2/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:D3QA2C7P7Z6LLH3RHY25O6VAI2","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":"6d8b3fabf07d8736b1f0c6bb6694fb8a36bde082dc6a4704e4b723911358209c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2014-01-09T09:09:06Z","title_canon_sha256":"3236623b1fc90262310338f7eeed8370cd17eeadddf1401aadb6fe00018e71c6"},"schema_version":"1.0","source":{"id":"1401.1931","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1401.1931","created_at":"2026-05-18T01:45:27Z"},{"alias_kind":"arxiv_version","alias_value":"1401.1931v1","created_at":"2026-05-18T01:45:27Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1401.1931","created_at":"2026-05-18T01:45:27Z"},{"alias_kind":"pith_short_12","alias_value":"D3QA2C7P7Z6L","created_at":"2026-05-18T12:28:25Z"},{"alias_kind":"pith_short_16","alias_value":"D3QA2C7P7Z6LLH3R","created_at":"2026-05-18T12:28:25Z"},{"alias_kind":"pith_short_8","alias_value":"D3QA2C7P","created_at":"2026-05-18T12:28:25Z"}],"graph_snapshots":[{"event_id":"sha256:0fb168c8348b784b3274725053b685de34e4e936a2269ad4c054b18c212061ce","target":"graph","created_at":"2026-05-18T01:45:27Z","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":"Barbarians, so named after the prototype of this class (234) Barbara, are a rare class of asteroids exhibiting anomalous polarimetric properties. Their very distinctive feature is that they show negative polarization at relatively large phase-angles, where all 'normal' asteroids show positive polarization. The origin of the Barbarian phenomenon is unclear, but it seems to be correlated with the presence of anomalous abundances of spinel, a mineral usually associated with the so-called Calcium Aluminum-rich inclusions (CAIs) on meteorites. Since CAIs are samples of the oldest solid matter ident","authors_text":"A. Cellino, B. Novakovic, M. Delbo`, P. Tanga, S. Bagnulo","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2014-01-09T09:09:06Z","title":"A successful search for hidden Barbarians in the Watsonia asteroid family"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1401.1931","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:a17dd9edc99592bc17017dae0e0061f2575ac0ea1b6737ef5149b01137c7f084","target":"record","created_at":"2026-05-18T01:45:27Z","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":"6d8b3fabf07d8736b1f0c6bb6694fb8a36bde082dc6a4704e4b723911358209c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2014-01-09T09:09:06Z","title_canon_sha256":"3236623b1fc90262310338f7eeed8370cd17eeadddf1401aadb6fe00018e71c6"},"schema_version":"1.0","source":{"id":"1401.1931","kind":"arxiv","version":1}},"canonical_sha256":"1ee00d0beffe7cb59f713e35d77aa0468ccccd22d40a90de0d4c7622e89015fd","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"1ee00d0beffe7cb59f713e35d77aa0468ccccd22d40a90de0d4c7622e89015fd","first_computed_at":"2026-05-18T01:45:27.244178Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:45:27.244178Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"6CQRYxjfY5IeAm1wWUnvjNcxFtuPlW4AawMDJhcd9Iaq8qp0ecpn2l3L9fTjW93MRjLsFso/cNeeDPc/dAoRDQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:45:27.244611Z","signed_message":"canonical_sha256_bytes"},"source_id":"1401.1931","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a17dd9edc99592bc17017dae0e0061f2575ac0ea1b6737ef5149b01137c7f084","sha256:0fb168c8348b784b3274725053b685de34e4e936a2269ad4c054b18c212061ce"],"state_sha256":"59f532fceecfcc1f63dccc5300d64a06f71c43abe4d9dd888e643edc844fe2bc"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/SG9K8lMwAWUA916kjIheJwROKcyndTmxIOgNbZSnwCyQnZdeGfGY64dpKYO/zzzSuAC2AHJmRsrRUAhTaTnAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T04:14:16.683448Z","bundle_sha256":"ccf4f3145c0a68cdc15043795f66e99a886f841762e1796789c23064b0d2a41d"}}