{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2024:2S7BXFVLV3CXOXL3B6XXDXWLXD","short_pith_number":"pith:2S7BXFVL","canonical_record":{"source":{"id":"2403.04141","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2024-03-07T01:41:43Z","cross_cats_sorted":[],"title_canon_sha256":"145c3875879fc89d860f647d57d5a16a810643edc0fa905599d6375544964c90","abstract_canon_sha256":"a8e2b1b20849495e86d815017e18f12e51c2b27a6af12ea3d98af88df8052b3a"},"schema_version":"1.0"},"canonical_sha256":"d4be1b96abaec5775d7b0faf71decbb8db167b1858e8a790318e46c428ba5193","source":{"kind":"arxiv","id":"2403.04141","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2403.04141","created_at":"2026-07-05T08:00:41Z"},{"alias_kind":"arxiv_version","alias_value":"2403.04141v2","created_at":"2026-07-05T08:00:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2403.04141","created_at":"2026-07-05T08:00:41Z"},{"alias_kind":"pith_short_12","alias_value":"2S7BXFVLV3CX","created_at":"2026-07-05T08:00:41Z"},{"alias_kind":"pith_short_16","alias_value":"2S7BXFVLV3CXOXL3","created_at":"2026-07-05T08:00:41Z"},{"alias_kind":"pith_short_8","alias_value":"2S7BXFVL","created_at":"2026-07-05T08:00:41Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2024:2S7BXFVLV3CXOXL3B6XXDXWLXD","target":"record","payload":{"canonical_record":{"source":{"id":"2403.04141","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2024-03-07T01:41:43Z","cross_cats_sorted":[],"title_canon_sha256":"145c3875879fc89d860f647d57d5a16a810643edc0fa905599d6375544964c90","abstract_canon_sha256":"a8e2b1b20849495e86d815017e18f12e51c2b27a6af12ea3d98af88df8052b3a"},"schema_version":"1.0"},"canonical_sha256":"d4be1b96abaec5775d7b0faf71decbb8db167b1858e8a790318e46c428ba5193","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T08:00:41.751944Z","signature_b64":"0AT/VV+QNojabm6IUxea/fDxr9EIwng1aANzQsNJQixSN7za6hobOeq3p03VJnF5mzwgGuWGWs7cs2MVTMc2Dw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d4be1b96abaec5775d7b0faf71decbb8db167b1858e8a790318e46c428ba5193","last_reissued_at":"2026-07-05T08:00:41.751439Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T08:00:41.751439Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2403.04141","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":"2026-07-05T08:00:41Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"reCeUiWfNztGGGXVNA5r2mn1ay8n0Y8/n71RDDP9nHBLBXu3mf/gCi+kxaqzAeduY4afiUoc0BmEGd1LzmXnCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-18T03:54:29.141230Z"},"content_sha256":"d5a3e375e36cf0216e21c0394c126373d6d77192c5c664a2ccf9519688b4c434","schema_version":"1.0","event_id":"sha256:d5a3e375e36cf0216e21c0394c126373d6d77192c5c664a2ccf9519688b4c434"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2024:2S7BXFVLV3CXOXL3B6XXDXWLXD","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"VLBI Astrometry of Radio Stars to Link Radio and Optical Celestial Reference Frames: Observing Strategies","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"Bo Zhang, Fengchun Shu, Hao Ding, Jingdong Zhang, Jinling Li, Jinqing Wang, Lang Cui, Niu Liu, Pengfei Jiang, Shiming Wen, Shuangjing Xu, Wen Chen, Xiaofeng Mai, Yan Sun, Yidan Huang","submitted_at":"2024-03-07T01:41:43Z","abstract_excerpt":"The Gaia celestial reference frame (Gaia-CRF) will benefit from a close assessment with independent methods, such as Very Long Baseline Interferometry (VLBI) measurements of radio stars at bright magnitudes. However, obtaining full astrometric parameters for each radio star through VLBI measurements demands a significant amount of observation time. This study proposes an efficient observing strategy that acquires double-epoch VLBI positions to measure the positions and proper motions of radio stars at a reduced cost. The solution for CRF link compatible with individual VLBI position measuremen"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2403.04141","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2403.04141/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T08:00:41Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"PhQHCXXJn6pWMcu7WsGrPMYAlhlhfVeTdDciJXrHdRf0iaAIHq3oWkkHefTds/scn78B3jz4DugJCh94Mq/jCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-18T03:54:29.142165Z"},"content_sha256":"68a5ed585ba11e36fff497d9e48ffd05038fefb3435cd675935c9556b9c84c5d","schema_version":"1.0","event_id":"sha256:68a5ed585ba11e36fff497d9e48ffd05038fefb3435cd675935c9556b9c84c5d"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/2S7BXFVLV3CXOXL3B6XXDXWLXD/bundle.json","state_url":"https://pith.science/pith/2S7BXFVLV3CXOXL3B6XXDXWLXD/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/2S7BXFVLV3CXOXL3B6XXDXWLXD/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":"2026-08-18T03:54:29Z","links":{"resolver":"https://pith.science/pith/2S7BXFVLV3CXOXL3B6XXDXWLXD","bundle":"https://pith.science/pith/2S7BXFVLV3CXOXL3B6XXDXWLXD/bundle.json","state":"https://pith.science/pith/2S7BXFVLV3CXOXL3B6XXDXWLXD/state.json","well_known_bundle":"https://pith.science/.well-known/pith/2S7BXFVLV3CXOXL3B6XXDXWLXD/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2024:2S7BXFVLV3CXOXL3B6XXDXWLXD","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":"a8e2b1b20849495e86d815017e18f12e51c2b27a6af12ea3d98af88df8052b3a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2024-03-07T01:41:43Z","title_canon_sha256":"145c3875879fc89d860f647d57d5a16a810643edc0fa905599d6375544964c90"},"schema_version":"1.0","source":{"id":"2403.04141","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2403.04141","created_at":"2026-07-05T08:00:41Z"},{"alias_kind":"arxiv_version","alias_value":"2403.04141v2","created_at":"2026-07-05T08:00:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2403.04141","created_at":"2026-07-05T08:00:41Z"},{"alias_kind":"pith_short_12","alias_value":"2S7BXFVLV3CX","created_at":"2026-07-05T08:00:41Z"},{"alias_kind":"pith_short_16","alias_value":"2S7BXFVLV3CXOXL3","created_at":"2026-07-05T08:00:41Z"},{"alias_kind":"pith_short_8","alias_value":"2S7BXFVL","created_at":"2026-07-05T08:00:41Z"}],"graph_snapshots":[{"event_id":"sha256:68a5ed585ba11e36fff497d9e48ffd05038fefb3435cd675935c9556b9c84c5d","target":"graph","created_at":"2026-07-05T08:00:41Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2403.04141/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The Gaia celestial reference frame (Gaia-CRF) will benefit from a close assessment with independent methods, such as Very Long Baseline Interferometry (VLBI) measurements of radio stars at bright magnitudes. However, obtaining full astrometric parameters for each radio star through VLBI measurements demands a significant amount of observation time. This study proposes an efficient observing strategy that acquires double-epoch VLBI positions to measure the positions and proper motions of radio stars at a reduced cost. The solution for CRF link compatible with individual VLBI position measuremen","authors_text":"Bo Zhang, Fengchun Shu, Hao Ding, Jingdong Zhang, Jinling Li, Jinqing Wang, Lang Cui, Niu Liu, Pengfei Jiang, Shiming Wen, Shuangjing Xu, Wen Chen, Xiaofeng Mai, Yan Sun, Yidan Huang","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2024-03-07T01:41:43Z","title":"VLBI Astrometry of Radio Stars to Link Radio and Optical Celestial Reference Frames: Observing Strategies"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2403.04141","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:d5a3e375e36cf0216e21c0394c126373d6d77192c5c664a2ccf9519688b4c434","target":"record","created_at":"2026-07-05T08:00:41Z","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":"a8e2b1b20849495e86d815017e18f12e51c2b27a6af12ea3d98af88df8052b3a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2024-03-07T01:41:43Z","title_canon_sha256":"145c3875879fc89d860f647d57d5a16a810643edc0fa905599d6375544964c90"},"schema_version":"1.0","source":{"id":"2403.04141","kind":"arxiv","version":2}},"canonical_sha256":"d4be1b96abaec5775d7b0faf71decbb8db167b1858e8a790318e46c428ba5193","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d4be1b96abaec5775d7b0faf71decbb8db167b1858e8a790318e46c428ba5193","first_computed_at":"2026-07-05T08:00:41.751439Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T08:00:41.751439Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"0AT/VV+QNojabm6IUxea/fDxr9EIwng1aANzQsNJQixSN7za6hobOeq3p03VJnF5mzwgGuWGWs7cs2MVTMc2Dw==","signature_status":"signed_v1","signed_at":"2026-07-05T08:00:41.751944Z","signed_message":"canonical_sha256_bytes"},"source_id":"2403.04141","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d5a3e375e36cf0216e21c0394c126373d6d77192c5c664a2ccf9519688b4c434","sha256:68a5ed585ba11e36fff497d9e48ffd05038fefb3435cd675935c9556b9c84c5d"],"state_sha256":"6aa8de9f8ea407c7cb005043407e095ee3a86839e617c9936f8bf36914634361"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"djN+IjahNzIBymXuJFc0Jz+pakECAPXOB6DgJ7evAYjOlsMaprn0hlYIjZj01yICzuitNNE1KP4s1az18osDCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-18T03:54:29.148228Z","bundle_sha256":"41f5315097a6a62aa2de7a8efebc651c7de4e7c9c35a13826a12a461fc832ea4"}}