{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:1997:HLD4H4CWA7ZDVTYNTBEFZQ3C3D","short_pith_number":"pith:HLD4H4CW","schema_version":"1.0","canonical_sha256":"3ac7c3f05607f23acf0d98485cc362d8d2a9c5583f371c48005d2ece5cd2d455","source":{"kind":"arxiv","id":"astro-ph/9702206","version":1},"attestation_state":"computed","paper":{"title":"Astrometric quality of the USNO CCD Astrograph (UCA)","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Norbert Zacharias (USRA, USNO, Washington DC)","submitted_at":"1997-02-24T16:00:45Z","abstract_excerpt":"The US Naval Observatory 8--inch astrograph has been equipped with a Kodak 1536x1024 pixel CCD since June 1995, operating in a 570--650 nm bandpass. With 3--minute exposures well exposed images are obtained in the magnitude range $R \\approx 8.5 - 13.5^{m}$. An astrometric precision of 10 to 15 mas for those stars is estimated from frame--to--frame comparisons. External comparisons reveal an accuracy of about 15 mas for those stars in a 20' field of view. For fainter stars, the error budget is dominated by the S/N ratio, reaching $\\approx 100$ mas at $R=16^{m}$ under good observing conditions."},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"astro-ph/9702206","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"1997-02-24T16:00:45Z","cross_cats_sorted":[],"title_canon_sha256":"b7def670de94a75259f665aa3b5bdb0a81f55f6bfd4fbd0e87fe8d7421dde3dc","abstract_canon_sha256":"69cb1b424abc28d374eb81d3930614bebf964e3829febdadbd7edca89acb2c22"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T16:02:53.627651Z","signature_b64":"sYIim5FnvXMd1Wtc2vsWeENL6qXykT+pdcHeya//1p+dJsswB5XTkz81+8kdyW6AEZKPB7xexC3hs6J0jWr4Dg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3ac7c3f05607f23acf0d98485cc362d8d2a9c5583f371c48005d2ece5cd2d455","last_reissued_at":"2026-07-04T16:02:53.626946Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T16:02:53.626946Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Astrometric quality of the USNO CCD Astrograph (UCA)","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Norbert Zacharias (USRA, USNO, Washington DC)","submitted_at":"1997-02-24T16:00:45Z","abstract_excerpt":"The US Naval Observatory 8--inch astrograph has been equipped with a Kodak 1536x1024 pixel CCD since June 1995, operating in a 570--650 nm bandpass. With 3--minute exposures well exposed images are obtained in the magnitude range $R \\approx 8.5 - 13.5^{m}$. An astrometric precision of 10 to 15 mas for those stars is estimated from frame--to--frame comparisons. External comparisons reveal an accuracy of about 15 mas for those stars in a 20' field of view. For fainter stars, the error budget is dominated by the S/N ratio, reaching $\\approx 100$ mas at $R=16^{m}$ under good observing conditions."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9702206","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/astro-ph/9702206/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"},"aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/9702206","created_at":"2026-07-04T16:02:53.627218+00:00"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/9702206v1","created_at":"2026-07-04T16:02:53.627218+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/9702206","created_at":"2026-07-04T16:02:53.627218+00:00"},{"alias_kind":"pith_short_12","alias_value":"HLD4H4CWA7ZD","created_at":"2026-07-04T16:02:53.627218+00:00"},{"alias_kind":"pith_short_16","alias_value":"HLD4H4CWA7ZDVTYN","created_at":"2026-07-04T16:02:53.627218+00:00"},{"alias_kind":"pith_short_8","alias_value":"HLD4H4CW","created_at":"2026-07-04T16:02:53.627218+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/HLD4H4CWA7ZDVTYNTBEFZQ3C3D","json":"https://pith.science/pith/HLD4H4CWA7ZDVTYNTBEFZQ3C3D.json","graph_json":"https://pith.science/api/pith-number/HLD4H4CWA7ZDVTYNTBEFZQ3C3D/graph.json","events_json":"https://pith.science/api/pith-number/HLD4H4CWA7ZDVTYNTBEFZQ3C3D/events.json","paper":"https://pith.science/paper/HLD4H4CW"},"agent_actions":{"view_html":"https://pith.science/pith/HLD4H4CWA7ZDVTYNTBEFZQ3C3D","download_json":"https://pith.science/pith/HLD4H4CWA7ZDVTYNTBEFZQ3C3D.json","view_paper":"https://pith.science/paper/HLD4H4CW","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=astro-ph/9702206&json=true","fetch_graph":"https://pith.science/api/pith-number/HLD4H4CWA7ZDVTYNTBEFZQ3C3D/graph.json","fetch_events":"https://pith.science/api/pith-number/HLD4H4CWA7ZDVTYNTBEFZQ3C3D/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/HLD4H4CWA7ZDVTYNTBEFZQ3C3D/action/timestamp_anchor","attest_storage":"https://pith.science/pith/HLD4H4CWA7ZDVTYNTBEFZQ3C3D/action/storage_attestation","attest_author":"https://pith.science/pith/HLD4H4CWA7ZDVTYNTBEFZQ3C3D/action/author_attestation","sign_citation":"https://pith.science/pith/HLD4H4CWA7ZDVTYNTBEFZQ3C3D/action/citation_signature","submit_replication":"https://pith.science/pith/HLD4H4CWA7ZDVTYNTBEFZQ3C3D/action/replication_record"}},"created_at":"2026-07-04T16:02:53.627218+00:00","updated_at":"2026-07-04T16:02:53.627218+00:00"}