{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:UTAUT7CNJY6TBSS6SGUZM4DB2S","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":"8469737b5f517f221e35f6a23f193aeb3b9cf6ace27c488e374f232f2e5c0b8c","cross_cats_sorted":["astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2017-10-17T20:08:07Z","title_canon_sha256":"046219d03e85b295c82a070caf397329208b3016c13a7ef49c4d795fa788c1b5"},"schema_version":"1.0","source":{"id":"1710.06489","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1710.06489","created_at":"2026-05-18T00:32:33Z"},{"alias_kind":"arxiv_version","alias_value":"1710.06489v1","created_at":"2026-05-18T00:32:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1710.06489","created_at":"2026-05-18T00:32:33Z"},{"alias_kind":"pith_short_12","alias_value":"UTAUT7CNJY6T","created_at":"2026-05-18T12:31:49Z"},{"alias_kind":"pith_short_16","alias_value":"UTAUT7CNJY6TBSS6","created_at":"2026-05-18T12:31:49Z"},{"alias_kind":"pith_short_8","alias_value":"UTAUT7CN","created_at":"2026-05-18T12:31:49Z"}],"graph_snapshots":[{"event_id":"sha256:ea07d73e00ea666e5ea7c9340291a1ff03408a5a348ba666dd22241dcaa49669","target":"graph","created_at":"2026-05-18T00:32:33Z","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":"Little is known about the portion of the Milky Way lying beyond the Galactic center at distances of more than 9 kilo-parsec from the Sun. These regions are opaque at optical wavelengths due to absorption by interstellar dust, and distances are very large and hard to measure. We report a direct trigonometric parallax distance of 20.4_{-2.2}^{+2.8} kilo-parsec obtained with the Very Long Baseline Array to a water maser source in a region of active star formation. These measurements allow us to shed light on Galactic spiral structure by locating the Scutum-Centaurus spiral arm as it passes throug","authors_text":"Alberto Sanna, Andreas Brunthaler, Karl M. Menten, Mark J. Reid, Thomas M. Dame","cross_cats":["astro-ph.SR"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2017-10-17T20:08:07Z","title":"Mapping Spiral Structure on the far side of the Milky Way"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1710.06489","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:d15dfa2d41f6236f3fc6a0ea2a871015262693b32d1c62a5bea5574ad44b4055","target":"record","created_at":"2026-05-18T00:32:33Z","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":"8469737b5f517f221e35f6a23f193aeb3b9cf6ace27c488e374f232f2e5c0b8c","cross_cats_sorted":["astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2017-10-17T20:08:07Z","title_canon_sha256":"046219d03e85b295c82a070caf397329208b3016c13a7ef49c4d795fa788c1b5"},"schema_version":"1.0","source":{"id":"1710.06489","kind":"arxiv","version":1}},"canonical_sha256":"a4c149fc4d4e3d30ca5e91a9967061d481b4039cdcb5746308cdf77cc609f84f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a4c149fc4d4e3d30ca5e91a9967061d481b4039cdcb5746308cdf77cc609f84f","first_computed_at":"2026-05-18T00:32:33.548719Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:32:33.548719Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"MKIzngaeyyLAE2NtkHrsj6hxkEYCbyPtE3yF61FBVyHrWcvxYZeKM93/87rg9EX4KM3CpL6jCT4O+Y+k3t2kAg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:32:33.549454Z","signed_message":"canonical_sha256_bytes"},"source_id":"1710.06489","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d15dfa2d41f6236f3fc6a0ea2a871015262693b32d1c62a5bea5574ad44b4055","sha256:ea07d73e00ea666e5ea7c9340291a1ff03408a5a348ba666dd22241dcaa49669"],"state_sha256":"bd3074a46a65fff6731d86ec97ff1ad9e1bb52d58b55fcdafba97e6623dc1d1f"}