{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:RAYV6RPM3YWLHH752ZWN3F54LD","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":"e4ccdef7a70e2c18d49cf301e9dfe0b267a2f373279703936a34445aa66cfb46","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2009-09-04T18:26:33Z","title_canon_sha256":"4eaf4c50f52d55f42fd348991ed59718674c1f2aa93dd2d19ee8da87d9c7f0ba"},"schema_version":"1.0","source":{"id":"0909.0933","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0909.0933","created_at":"2026-05-18T02:11:59Z"},{"alias_kind":"arxiv_version","alias_value":"0909.0933v1","created_at":"2026-05-18T02:11:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0909.0933","created_at":"2026-05-18T02:11:59Z"},{"alias_kind":"pith_short_12","alias_value":"RAYV6RPM3YWL","created_at":"2026-05-18T12:26:01Z"},{"alias_kind":"pith_short_16","alias_value":"RAYV6RPM3YWLHH75","created_at":"2026-05-18T12:26:01Z"},{"alias_kind":"pith_short_8","alias_value":"RAYV6RPM","created_at":"2026-05-18T12:26:01Z"}],"graph_snapshots":[{"event_id":"sha256:a375960ae2c02ff5f0abe0da4ce34664b149cdf4737eef65ced879de91399c20","target":"graph","created_at":"2026-05-18T02:11:59Z","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":"Aims: The effect of frequency-dependent AGN core positions (``core-shifts'') on radio Very Long Baseline Interferometry (VLBI) global astrometry measurements is investigated.\n  Methods: The basic equations relating to VLBI astrometry are reviewed, including the effects of source structure. A power-law representation of core-shifts, based on both observations and theoretical considerations of jet conditions, is incorporated.\n  Results: It is shown that, in the presence of core-shifts, phase and group-delay astrometry measurements yield different positions. For a core displacement from the jet b","authors_text":"R. W. Porcas (MPIfR)","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2009-09-04T18:26:33Z","title":"Radio astrometry with chromatic AGN core positions"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0909.0933","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:edeff989693b79ae599bf33cc0cfe0d74db8f93add12c1a2e67d4b5a504c2a99","target":"record","created_at":"2026-05-18T02:11:59Z","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":"e4ccdef7a70e2c18d49cf301e9dfe0b267a2f373279703936a34445aa66cfb46","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2009-09-04T18:26:33Z","title_canon_sha256":"4eaf4c50f52d55f42fd348991ed59718674c1f2aa93dd2d19ee8da87d9c7f0ba"},"schema_version":"1.0","source":{"id":"0909.0933","kind":"arxiv","version":1}},"canonical_sha256":"88315f45ecde2cb39ffdd66cdd97bc58f195ef3c2d6ff5620e8aecf0c40843ee","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"88315f45ecde2cb39ffdd66cdd97bc58f195ef3c2d6ff5620e8aecf0c40843ee","first_computed_at":"2026-05-18T02:11:59.627306Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:11:59.627306Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"mja3QJNu6EEiZtFgRvpxWhGUF+lqCi7a9OuG2di6i2nU1n7aDAifL44z7bPaygDOyKFgCqsPTAmac586iln6AQ==","signature_status":"signed_v1","signed_at":"2026-05-18T02:11:59.628023Z","signed_message":"canonical_sha256_bytes"},"source_id":"0909.0933","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:edeff989693b79ae599bf33cc0cfe0d74db8f93add12c1a2e67d4b5a504c2a99","sha256:a375960ae2c02ff5f0abe0da4ce34664b149cdf4737eef65ced879de91399c20"],"state_sha256":"22278b1885a2a9960253e62940916e4f6c59f08497fc4f60f5404257f85f3780"}