{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:5DYBDWMWW3DWT7DGR7G7PTR4ON","short_pith_number":"pith:5DYBDWMW","canonical_record":{"source":{"id":"1406.4846","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2014-02-14T08:20:11Z","cross_cats_sorted":[],"title_canon_sha256":"539ba95f55a3e7ad42c2e7608ca9f6ab345ae8ca407c9bc8292eef1e76a15db4","abstract_canon_sha256":"2374eac6b72e8a425aa4a1309c1aa9b88fb9663d8dc6ad726eb94dbb074ee87a"},"schema_version":"1.0"},"canonical_sha256":"e8f011d996b6c769fc668fcdf7ce3c73578564eeb033ed4e3e62249d4127cb6c","source":{"kind":"arxiv","id":"1406.4846","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1406.4846","created_at":"2026-05-18T02:49:30Z"},{"alias_kind":"arxiv_version","alias_value":"1406.4846v1","created_at":"2026-05-18T02:49:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1406.4846","created_at":"2026-05-18T02:49:30Z"},{"alias_kind":"pith_short_12","alias_value":"5DYBDWMWW3DW","created_at":"2026-05-18T12:28:14Z"},{"alias_kind":"pith_short_16","alias_value":"5DYBDWMWW3DWT7DG","created_at":"2026-05-18T12:28:14Z"},{"alias_kind":"pith_short_8","alias_value":"5DYBDWMW","created_at":"2026-05-18T12:28:14Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:5DYBDWMWW3DWT7DGR7G7PTR4ON","target":"record","payload":{"canonical_record":{"source":{"id":"1406.4846","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2014-02-14T08:20:11Z","cross_cats_sorted":[],"title_canon_sha256":"539ba95f55a3e7ad42c2e7608ca9f6ab345ae8ca407c9bc8292eef1e76a15db4","abstract_canon_sha256":"2374eac6b72e8a425aa4a1309c1aa9b88fb9663d8dc6ad726eb94dbb074ee87a"},"schema_version":"1.0"},"canonical_sha256":"e8f011d996b6c769fc668fcdf7ce3c73578564eeb033ed4e3e62249d4127cb6c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:49:30.209235Z","signature_b64":"U3TqEsNLgzDCnbgvoNVAM5N8SeP5H3sX7V7oazl1q68SJ1la+2apm7yS/TakBQIzrps3F/6q+OHXYZIin8h7Cw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e8f011d996b6c769fc668fcdf7ce3c73578564eeb033ed4e3e62249d4127cb6c","last_reissued_at":"2026-05-18T02:49:30.208785Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:49:30.208785Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1406.4846","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":"2026-05-18T02:49:30Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"sLnlmoeYmIRCa7ZXwzc8/FIrx8gtf29KjYGE8lMN95D9tdRDteCe7jUplJte0kOnv1Kb1y/uvPkjLWFtCuB5Dg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T05:00:48.094411Z"},"content_sha256":"d1d9fcd39a6cc1f2b9fd8d9ef44165239eba036d50fd1f7ec71e4a2a6411ac56","schema_version":"1.0","event_id":"sha256:d1d9fcd39a6cc1f2b9fd8d9ef44165239eba036d50fd1f7ec71e4a2a6411ac56"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:5DYBDWMWW3DWT7DGR7G7PTR4ON","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A geometric delay model for Space VLBI","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"Shi-Long Liao, Zhao-Xiang Qi, Zheng-Hong Tang","submitted_at":"2014-02-14T08:20:11Z","abstract_excerpt":"A relativistic delay model for space very long baseline interferometry (hereafter SVLBI) observation of sources at infinite distance is derived. In SVLBI, where one station is on a spacecraft, the orbiting station's maximum speed in an elliptical Earth orbit is much bigger than the ground VLBI (here after GVLBI), leading to a higher delay rate . The delay models inside the VLBI correlators are usually expressed as fifth-order polynomials in time that good for a limited time interval, which are evaluated by the correlator firmware and track the interferometer delays over a limited time interval"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1406.4846","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":"2026-05-18T02:49:30Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"c06qU4DwGnoazOusdGp457SwAlSebu1zYN9sgoeU1OGpvNZQIuVTk6uPj6aNzVjcvaJLPNvhW41twXhflo+oCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T05:00:48.094805Z"},"content_sha256":"8c108d9f07fc87506031b2613f551148a170f08ec091f79d176a43b4d6e7445e","schema_version":"1.0","event_id":"sha256:8c108d9f07fc87506031b2613f551148a170f08ec091f79d176a43b4d6e7445e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/5DYBDWMWW3DWT7DGR7G7PTR4ON/bundle.json","state_url":"https://pith.science/pith/5DYBDWMWW3DWT7DGR7G7PTR4ON/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/5DYBDWMWW3DWT7DGR7G7PTR4ON/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":"2026-06-03T05:00:48Z","links":{"resolver":"https://pith.science/pith/5DYBDWMWW3DWT7DGR7G7PTR4ON","bundle":"https://pith.science/pith/5DYBDWMWW3DWT7DGR7G7PTR4ON/bundle.json","state":"https://pith.science/pith/5DYBDWMWW3DWT7DGR7G7PTR4ON/state.json","well_known_bundle":"https://pith.science/.well-known/pith/5DYBDWMWW3DWT7DGR7G7PTR4ON/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:5DYBDWMWW3DWT7DGR7G7PTR4ON","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":"2374eac6b72e8a425aa4a1309c1aa9b88fb9663d8dc6ad726eb94dbb074ee87a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2014-02-14T08:20:11Z","title_canon_sha256":"539ba95f55a3e7ad42c2e7608ca9f6ab345ae8ca407c9bc8292eef1e76a15db4"},"schema_version":"1.0","source":{"id":"1406.4846","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1406.4846","created_at":"2026-05-18T02:49:30Z"},{"alias_kind":"arxiv_version","alias_value":"1406.4846v1","created_at":"2026-05-18T02:49:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1406.4846","created_at":"2026-05-18T02:49:30Z"},{"alias_kind":"pith_short_12","alias_value":"5DYBDWMWW3DW","created_at":"2026-05-18T12:28:14Z"},{"alias_kind":"pith_short_16","alias_value":"5DYBDWMWW3DWT7DG","created_at":"2026-05-18T12:28:14Z"},{"alias_kind":"pith_short_8","alias_value":"5DYBDWMW","created_at":"2026-05-18T12:28:14Z"}],"graph_snapshots":[{"event_id":"sha256:8c108d9f07fc87506031b2613f551148a170f08ec091f79d176a43b4d6e7445e","target":"graph","created_at":"2026-05-18T02:49:30Z","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":"A relativistic delay model for space very long baseline interferometry (hereafter SVLBI) observation of sources at infinite distance is derived. In SVLBI, where one station is on a spacecraft, the orbiting station's maximum speed in an elliptical Earth orbit is much bigger than the ground VLBI (here after GVLBI), leading to a higher delay rate . The delay models inside the VLBI correlators are usually expressed as fifth-order polynomials in time that good for a limited time interval, which are evaluated by the correlator firmware and track the interferometer delays over a limited time interval","authors_text":"Shi-Long Liao, Zhao-Xiang Qi, Zheng-Hong Tang","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2014-02-14T08:20:11Z","title":"A geometric delay model for Space VLBI"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1406.4846","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:d1d9fcd39a6cc1f2b9fd8d9ef44165239eba036d50fd1f7ec71e4a2a6411ac56","target":"record","created_at":"2026-05-18T02:49:30Z","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":"2374eac6b72e8a425aa4a1309c1aa9b88fb9663d8dc6ad726eb94dbb074ee87a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2014-02-14T08:20:11Z","title_canon_sha256":"539ba95f55a3e7ad42c2e7608ca9f6ab345ae8ca407c9bc8292eef1e76a15db4"},"schema_version":"1.0","source":{"id":"1406.4846","kind":"arxiv","version":1}},"canonical_sha256":"e8f011d996b6c769fc668fcdf7ce3c73578564eeb033ed4e3e62249d4127cb6c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e8f011d996b6c769fc668fcdf7ce3c73578564eeb033ed4e3e62249d4127cb6c","first_computed_at":"2026-05-18T02:49:30.208785Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:49:30.208785Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"U3TqEsNLgzDCnbgvoNVAM5N8SeP5H3sX7V7oazl1q68SJ1la+2apm7yS/TakBQIzrps3F/6q+OHXYZIin8h7Cw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:49:30.209235Z","signed_message":"canonical_sha256_bytes"},"source_id":"1406.4846","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d1d9fcd39a6cc1f2b9fd8d9ef44165239eba036d50fd1f7ec71e4a2a6411ac56","sha256:8c108d9f07fc87506031b2613f551148a170f08ec091f79d176a43b4d6e7445e"],"state_sha256":"f474f6f4a1206fa8369dbd17804361560dbaa60c28e97504ad61b002ca801279"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"I6XUfbKkUwjlYrXaYXr3CjWjG8PZmjCWcQBZtvXMH7D6QB7A5yZxxwlT/5jtkv8Gw0PLzoEc1j2U8euWj36LAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-03T05:00:48.097041Z","bundle_sha256":"cc444b87d9dad8a887a14a96013cc4a4af1088382f8e7fdfa4633963ba2d5197"}}