{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:XRT2QHQZ2GUM4VIJOPE7DGSNPJ","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":"9a6cbe808c8b10681244a137ad6f1c3119d970221ceb272ea3a83d559fcc8fef","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-07-01T11:17:03Z","title_canon_sha256":"7f16ae82d2b80f67299baadcd99282809d134bff4153096ab074588c21029b09"},"schema_version":"1.0","source":{"id":"1807.00315","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1807.00315","created_at":"2026-05-18T00:06:59Z"},{"alias_kind":"arxiv_version","alias_value":"1807.00315v2","created_at":"2026-05-18T00:06:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1807.00315","created_at":"2026-05-18T00:06:59Z"},{"alias_kind":"pith_short_12","alias_value":"XRT2QHQZ2GUM","created_at":"2026-05-18T12:33:01Z"},{"alias_kind":"pith_short_16","alias_value":"XRT2QHQZ2GUM4VIJ","created_at":"2026-05-18T12:33:01Z"},{"alias_kind":"pith_short_8","alias_value":"XRT2QHQZ","created_at":"2026-05-18T12:33:01Z"}],"graph_snapshots":[{"event_id":"sha256:d46cacdcd7074d032333fed7e27045451bd6c9bebd61668d3256b525304c04c7","target":"graph","created_at":"2026-05-18T00:06:59Z","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":"Context. The Gaia mission has released the second data set (Gaia DR2), which contains parallaxes and proper motions for a large number of massive, young stars. Aims. We investigate the spiral structure in the solar neighborhood revealed by Gaia DR2 and compare it with that depicted by VLBI maser parallaxes. Methods. We examined three samples with different constraints on parallax uncertainty and distance errors and stellar spectral types: (1) all OB stars with parallax errors of less than 10%; (2) only O-type stars with 0.1 mas errors imposed and with parallax distance errors of less than 0.2 ","authors_text":"B. Zhang, J. J. Li, K. M. Menten, M. J. Reid, Q. Z. Yan, S. B. Bian, S. L. Liao, T. M. Dame, Y. Xu, Z. H. He, Z. H. Tang","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-07-01T11:17:03Z","title":"A comparison of the local spiral structure from Gaia DR2 and VLBI maser parallaxes"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1807.00315","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:afe626693459c8552b0580ba976ce8800e7170baed73908b9caadc260c39d22f","target":"record","created_at":"2026-05-18T00:06:59Z","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":"9a6cbe808c8b10681244a137ad6f1c3119d970221ceb272ea3a83d559fcc8fef","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-07-01T11:17:03Z","title_canon_sha256":"7f16ae82d2b80f67299baadcd99282809d134bff4153096ab074588c21029b09"},"schema_version":"1.0","source":{"id":"1807.00315","kind":"arxiv","version":2}},"canonical_sha256":"bc67a81e19d1a8ce550973c9f19a4d7a77cf292f46e40d9996a2a026ae574e23","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"bc67a81e19d1a8ce550973c9f19a4d7a77cf292f46e40d9996a2a026ae574e23","first_computed_at":"2026-05-18T00:06:59.220028Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:06:59.220028Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"vf+kVZcNFzIbe4+7R2RtPkqEqAfCOC6Af2zkO9f+kX4yGHgzr41SBKyOmKgdeILSv+LhJ683yBk+9WQJaJU9Ag==","signature_status":"signed_v1","signed_at":"2026-05-18T00:06:59.220558Z","signed_message":"canonical_sha256_bytes"},"source_id":"1807.00315","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:afe626693459c8552b0580ba976ce8800e7170baed73908b9caadc260c39d22f","sha256:d46cacdcd7074d032333fed7e27045451bd6c9bebd61668d3256b525304c04c7"],"state_sha256":"f0a83b5591db7dcc7a271123a73d2638ea9c304775ca88a29dc1594c6a9ef58b"}