{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2003:4YQKP6AAP5BJFULV3NQ675ALLZ","short_pith_number":"pith:4YQKP6AA","schema_version":"1.0","canonical_sha256":"e620a7f8007f4292d175db61eff40b5e7313d8711f0f6636feb722116900847d","source":{"kind":"arxiv","id":"astro-ph/0305259","version":1},"attestation_state":"computed","paper":{"title":"The Cepheid Distance to NGC 1637: A Direct Test of the EPM Distance to SN 1999em","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Choong C. Ngeow, Douglas C. Leonard, Nial R. Tanvir, Shashi M. Kanbur","submitted_at":"2003-05-15T08:23:15Z","abstract_excerpt":"Type II-plateau supernovae (SNe II-P) are the classic variety of core-collapse events that result from isolated, massive stars with thick hydrogen envelopes intact at the time of explosion. Their distances are now routinely estimated through two techniques: the expanding photosphere method (EPM), a primary distance-determining method, and the recently developed standard-candle method (SCM), a promising secondary technique. Using Cycle 10 HST observations, we identify 41 Cepheid variable stars in NGC 1637, the host galaxy of the most thoroughly studied SN II-P to date, SN 1999em. Remarkably, th"},"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/0305259","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2003-05-15T08:23:15Z","cross_cats_sorted":[],"title_canon_sha256":"95bc2090fefcd63115d755924c091da274114223164c114954bef4523203774a","abstract_canon_sha256":"421ee0d96fdf8aa2db9f66912634ea64426c6af45bf5743a944ed3e2eff9d19d"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T16:37:08.549979Z","signature_b64":"rx2U3RB5LMbPw7BwzxXg76FNIMoT2Jh4AYG8YBwFdM7GTVAz6UbtWX65piVVC/9RVew7R2RqyNBtx6J98M/MBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e620a7f8007f4292d175db61eff40b5e7313d8711f0f6636feb722116900847d","last_reissued_at":"2026-07-04T16:37:08.549567Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T16:37:08.549567Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"The Cepheid Distance to NGC 1637: A Direct Test of the EPM Distance to SN 1999em","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Choong C. Ngeow, Douglas C. Leonard, Nial R. Tanvir, Shashi M. Kanbur","submitted_at":"2003-05-15T08:23:15Z","abstract_excerpt":"Type II-plateau supernovae (SNe II-P) are the classic variety of core-collapse events that result from isolated, massive stars with thick hydrogen envelopes intact at the time of explosion. Their distances are now routinely estimated through two techniques: the expanding photosphere method (EPM), a primary distance-determining method, and the recently developed standard-candle method (SCM), a promising secondary technique. Using Cycle 10 HST observations, we identify 41 Cepheid variable stars in NGC 1637, the host galaxy of the most thoroughly studied SN II-P to date, SN 1999em. Remarkably, th"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0305259","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/0305259/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/0305259","created_at":"2026-07-04T16:37:08.549627+00:00"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0305259v1","created_at":"2026-07-04T16:37:08.549627+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0305259","created_at":"2026-07-04T16:37:08.549627+00:00"},{"alias_kind":"pith_short_12","alias_value":"4YQKP6AAP5BJ","created_at":"2026-07-04T16:37:08.549627+00:00"},{"alias_kind":"pith_short_16","alias_value":"4YQKP6AAP5BJFULV","created_at":"2026-07-04T16:37:08.549627+00:00"},{"alias_kind":"pith_short_8","alias_value":"4YQKP6AA","created_at":"2026-07-04T16:37:08.549627+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/4YQKP6AAP5BJFULV3NQ675ALLZ","json":"https://pith.science/pith/4YQKP6AAP5BJFULV3NQ675ALLZ.json","graph_json":"https://pith.science/api/pith-number/4YQKP6AAP5BJFULV3NQ675ALLZ/graph.json","events_json":"https://pith.science/api/pith-number/4YQKP6AAP5BJFULV3NQ675ALLZ/events.json","paper":"https://pith.science/paper/4YQKP6AA"},"agent_actions":{"view_html":"https://pith.science/pith/4YQKP6AAP5BJFULV3NQ675ALLZ","download_json":"https://pith.science/pith/4YQKP6AAP5BJFULV3NQ675ALLZ.json","view_paper":"https://pith.science/paper/4YQKP6AA","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=astro-ph/0305259&json=true","fetch_graph":"https://pith.science/api/pith-number/4YQKP6AAP5BJFULV3NQ675ALLZ/graph.json","fetch_events":"https://pith.science/api/pith-number/4YQKP6AAP5BJFULV3NQ675ALLZ/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/4YQKP6AAP5BJFULV3NQ675ALLZ/action/timestamp_anchor","attest_storage":"https://pith.science/pith/4YQKP6AAP5BJFULV3NQ675ALLZ/action/storage_attestation","attest_author":"https://pith.science/pith/4YQKP6AAP5BJFULV3NQ675ALLZ/action/author_attestation","sign_citation":"https://pith.science/pith/4YQKP6AAP5BJFULV3NQ675ALLZ/action/citation_signature","submit_replication":"https://pith.science/pith/4YQKP6AAP5BJFULV3NQ675ALLZ/action/replication_record"}},"created_at":"2026-07-04T16:37:08.549627+00:00","updated_at":"2026-07-04T16:37:08.549627+00:00"}