{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2020:LNAE4Q2IXVAIEQRXQCHTL4Q4SB","short_pith_number":"pith:LNAE4Q2I","canonical_record":{"source":{"id":"2008.07790","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2020-08-18T07:59:00Z","cross_cats_sorted":[],"title_canon_sha256":"acb17807aea33677c5d11487d7a858855ed007b87c7d55196b341f5861c03e71","abstract_canon_sha256":"b0dfeed16cc7baabf91b18d8a59b27ec0abfd418faa8eae99ed39dc717755dc6"},"schema_version":"1.0"},"canonical_sha256":"5b404e4348bd40824237808f35f21c9050dc5ed599b79ede30c542d8f111d793","source":{"kind":"arxiv","id":"2008.07790","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2008.07790","created_at":"2026-07-05T02:27:25Z"},{"alias_kind":"arxiv_version","alias_value":"2008.07790v1","created_at":"2026-07-05T02:27:25Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2008.07790","created_at":"2026-07-05T02:27:25Z"},{"alias_kind":"pith_short_12","alias_value":"LNAE4Q2IXVAI","created_at":"2026-07-05T02:27:25Z"},{"alias_kind":"pith_short_16","alias_value":"LNAE4Q2IXVAIEQRX","created_at":"2026-07-05T02:27:25Z"},{"alias_kind":"pith_short_8","alias_value":"LNAE4Q2I","created_at":"2026-07-05T02:27:25Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2020:LNAE4Q2IXVAIEQRXQCHTL4Q4SB","target":"record","payload":{"canonical_record":{"source":{"id":"2008.07790","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2020-08-18T07:59:00Z","cross_cats_sorted":[],"title_canon_sha256":"acb17807aea33677c5d11487d7a858855ed007b87c7d55196b341f5861c03e71","abstract_canon_sha256":"b0dfeed16cc7baabf91b18d8a59b27ec0abfd418faa8eae99ed39dc717755dc6"},"schema_version":"1.0"},"canonical_sha256":"5b404e4348bd40824237808f35f21c9050dc5ed599b79ede30c542d8f111d793","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T02:27:25.002359Z","signature_b64":"iMCmjNeB6l79D8K2v4vgHYslbTd/8TaRCRFtLqqb5j8fUV0mfVZfRm/r9ztv/Kh5ZYVfc6gXJ5Spe7o0OHoVCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5b404e4348bd40824237808f35f21c9050dc5ed599b79ede30c542d8f111d793","last_reissued_at":"2026-07-05T02:27:25.001802Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T02:27:25.001802Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2008.07790","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":"2026-07-05T02:27:25Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9vLgcyHy6evf2CDI7613PL310SjZoREKSQVJTHNYThkjSRS0MHLRvROknVvMD8Vq7M/ZiliDdJ8ePOO8FwUOAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-07T03:55:30.457719Z"},"content_sha256":"6f4a09be6056419774610d369f09ca5f1d3c2ae90172d6dd48f3f675169ac5ad","schema_version":"1.0","event_id":"sha256:6f4a09be6056419774610d369f09ca5f1d3c2ae90172d6dd48f3f675169ac5ad"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2020:LNAE4Q2IXVAIEQRXQCHTL4Q4SB","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The optimization of satellite orbit for Space-VLBI observation","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"Lei Liu, Weimin Zheng","submitted_at":"2020-08-18T07:59:00Z","abstract_excerpt":"By sending one or more telescopes into space, Space-VLBI (SVLBI) is able to achieve even higher angular resolution and is therefore the trend of the VLBI technique. For SVLBI program, the design of satellite orbits plays an important role for the success of planned observation. In this paper, we present our orbit optimization scheme, so as to facilitate the design of satellite orbit for SVLBI observation. To achieve that, we characterize the $uv$ coverage with a measure index and minimize it by finding out the corresponding orbit configuration. In this way, the design of satellite orbit is con"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2008.07790","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2008.07790/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":"2026-07-05T02:27:25Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QbPU8SKfP8delB5vghxf/sZpTm4DA4BVxErg9rwj+VgpymdcT8r4EVn2yRvq9pYsATjzhhtUf58V1wpg2DUsCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-07T03:55:30.458264Z"},"content_sha256":"cc892d60981cb3d569f9a59faff527658d89b2b12cabfa140ed1c972c75c6b35","schema_version":"1.0","event_id":"sha256:cc892d60981cb3d569f9a59faff527658d89b2b12cabfa140ed1c972c75c6b35"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/LNAE4Q2IXVAIEQRXQCHTL4Q4SB/bundle.json","state_url":"https://pith.science/pith/LNAE4Q2IXVAIEQRXQCHTL4Q4SB/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/LNAE4Q2IXVAIEQRXQCHTL4Q4SB/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":"2026-08-07T03:55:30Z","links":{"resolver":"https://pith.science/pith/LNAE4Q2IXVAIEQRXQCHTL4Q4SB","bundle":"https://pith.science/pith/LNAE4Q2IXVAIEQRXQCHTL4Q4SB/bundle.json","state":"https://pith.science/pith/LNAE4Q2IXVAIEQRXQCHTL4Q4SB/state.json","well_known_bundle":"https://pith.science/.well-known/pith/LNAE4Q2IXVAIEQRXQCHTL4Q4SB/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:LNAE4Q2IXVAIEQRXQCHTL4Q4SB","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":"b0dfeed16cc7baabf91b18d8a59b27ec0abfd418faa8eae99ed39dc717755dc6","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2020-08-18T07:59:00Z","title_canon_sha256":"acb17807aea33677c5d11487d7a858855ed007b87c7d55196b341f5861c03e71"},"schema_version":"1.0","source":{"id":"2008.07790","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2008.07790","created_at":"2026-07-05T02:27:25Z"},{"alias_kind":"arxiv_version","alias_value":"2008.07790v1","created_at":"2026-07-05T02:27:25Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2008.07790","created_at":"2026-07-05T02:27:25Z"},{"alias_kind":"pith_short_12","alias_value":"LNAE4Q2IXVAI","created_at":"2026-07-05T02:27:25Z"},{"alias_kind":"pith_short_16","alias_value":"LNAE4Q2IXVAIEQRX","created_at":"2026-07-05T02:27:25Z"},{"alias_kind":"pith_short_8","alias_value":"LNAE4Q2I","created_at":"2026-07-05T02:27:25Z"}],"graph_snapshots":[{"event_id":"sha256:cc892d60981cb3d569f9a59faff527658d89b2b12cabfa140ed1c972c75c6b35","target":"graph","created_at":"2026-07-05T02:27:25Z","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/2008.07790/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"By sending one or more telescopes into space, Space-VLBI (SVLBI) is able to achieve even higher angular resolution and is therefore the trend of the VLBI technique. For SVLBI program, the design of satellite orbits plays an important role for the success of planned observation. In this paper, we present our orbit optimization scheme, so as to facilitate the design of satellite orbit for SVLBI observation. To achieve that, we characterize the $uv$ coverage with a measure index and minimize it by finding out the corresponding orbit configuration. In this way, the design of satellite orbit is con","authors_text":"Lei Liu, Weimin Zheng","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2020-08-18T07:59:00Z","title":"The optimization of satellite orbit for Space-VLBI observation"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2008.07790","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":"sha256:6f4a09be6056419774610d369f09ca5f1d3c2ae90172d6dd48f3f675169ac5ad","target":"record","created_at":"2026-07-05T02:27:25Z","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":"b0dfeed16cc7baabf91b18d8a59b27ec0abfd418faa8eae99ed39dc717755dc6","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2020-08-18T07:59:00Z","title_canon_sha256":"acb17807aea33677c5d11487d7a858855ed007b87c7d55196b341f5861c03e71"},"schema_version":"1.0","source":{"id":"2008.07790","kind":"arxiv","version":1}},"canonical_sha256":"5b404e4348bd40824237808f35f21c9050dc5ed599b79ede30c542d8f111d793","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"5b404e4348bd40824237808f35f21c9050dc5ed599b79ede30c542d8f111d793","first_computed_at":"2026-07-05T02:27:25.001802Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T02:27:25.001802Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"iMCmjNeB6l79D8K2v4vgHYslbTd/8TaRCRFtLqqb5j8fUV0mfVZfRm/r9ztv/Kh5ZYVfc6gXJ5Spe7o0OHoVCg==","signature_status":"signed_v1","signed_at":"2026-07-05T02:27:25.002359Z","signed_message":"canonical_sha256_bytes"},"source_id":"2008.07790","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:6f4a09be6056419774610d369f09ca5f1d3c2ae90172d6dd48f3f675169ac5ad","sha256:cc892d60981cb3d569f9a59faff527658d89b2b12cabfa140ed1c972c75c6b35"],"state_sha256":"2af23af59deebabf8d6b61f83a60fff9ee9e01ca5d40deda2b8b85a32c6428f0"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fsu9JJBjykN7mfoOi+5G2Ft9evxpQ96Uha1zhNfedNjhIodVq5cJ7VmVF2aLv7/GoYTRydWpOogrAUvtuA0qDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-07T03:55:30.462107Z","bundle_sha256":"df9ff237c888e3aa993bba30b93c9b5286286c09f1105fcf28ba4c2b18eff5d5"}}