{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:1997:YWPRANFO6JPQ53GNFXKDGNZTEM","short_pith_number":"pith:YWPRANFO","schema_version":"1.0","canonical_sha256":"c59f1034aef25f0eeccd2dd4333733231e4320169c451ec54d3f4781f7b9e893","source":{"kind":"arxiv","id":"astro-ph/9702119","version":1},"attestation_state":"computed","paper":{"title":"Optical photometry of the eclipsing Large Magellanic Cloud supersoft source CAL 87","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"C. Alcock, et al","submitted_at":"1997-02-13T17:43:43Z","abstract_excerpt":"We present optical photometry of the eclipsing supersoft source, CAL87. These observations comprise long term data accumulated as a by-product of the MACHO Project, and high speed white light photometry of a single eclipse. We (i) derive an improved ephemeris of To = HJD 2450111.5144(3) + 0.44267714(6)E for the time of minimum light, (ii) find the eclipse structure to be stable over a period of 4 years, and (iii) investigate the colour variation as a function of orbital phase. The resolution afforded by the high speed nature of the white light observations enables us to see new structure in 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/9702119","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"1997-02-13T17:43:43Z","cross_cats_sorted":[],"title_canon_sha256":"24980ce8c791d64a02001615ad2a5a04b9ae4965f4c1a12b4f74e1f2f72411a9","abstract_canon_sha256":"57aff1cfc720bc8726879b621fdf3c436217017dc33013813c4d45ab2a47d386"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:40:18.134279Z","signature_b64":"eZYPsUCf7o5au0/NMViS2iSU7FO6JL7MdUa0+xHD+FKVf0+pEowwaZ6em/VbV8Tjly1f60bY8MK2VbcBoRzsDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c59f1034aef25f0eeccd2dd4333733231e4320169c451ec54d3f4781f7b9e893","last_reissued_at":"2026-05-18T01:40:18.133677Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:40:18.133677Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Optical photometry of the eclipsing Large Magellanic Cloud supersoft source CAL 87","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"C. Alcock, et al","submitted_at":"1997-02-13T17:43:43Z","abstract_excerpt":"We present optical photometry of the eclipsing supersoft source, CAL87. These observations comprise long term data accumulated as a by-product of the MACHO Project, and high speed white light photometry of a single eclipse. We (i) derive an improved ephemeris of To = HJD 2450111.5144(3) + 0.44267714(6)E for the time of minimum light, (ii) find the eclipse structure to be stable over a period of 4 years, and (iii) investigate the colour variation as a function of orbital phase. The resolution afforded by the high speed nature of the white light observations enables us to see new structure in th"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9702119","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":""},"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/9702119","created_at":"2026-05-18T01:40:18.133746+00:00"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/9702119v1","created_at":"2026-05-18T01:40:18.133746+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/9702119","created_at":"2026-05-18T01:40:18.133746+00:00"},{"alias_kind":"pith_short_12","alias_value":"YWPRANFO6JPQ","created_at":"2026-05-18T12:25:49.038998+00:00"},{"alias_kind":"pith_short_16","alias_value":"YWPRANFO6JPQ53GN","created_at":"2026-05-18T12:25:49.038998+00:00"},{"alias_kind":"pith_short_8","alias_value":"YWPRANFO","created_at":"2026-05-18T12:25:49.038998+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/YWPRANFO6JPQ53GNFXKDGNZTEM","json":"https://pith.science/pith/YWPRANFO6JPQ53GNFXKDGNZTEM.json","graph_json":"https://pith.science/api/pith-number/YWPRANFO6JPQ53GNFXKDGNZTEM/graph.json","events_json":"https://pith.science/api/pith-number/YWPRANFO6JPQ53GNFXKDGNZTEM/events.json","paper":"https://pith.science/paper/YWPRANFO"},"agent_actions":{"view_html":"https://pith.science/pith/YWPRANFO6JPQ53GNFXKDGNZTEM","download_json":"https://pith.science/pith/YWPRANFO6JPQ53GNFXKDGNZTEM.json","view_paper":"https://pith.science/paper/YWPRANFO","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=astro-ph/9702119&json=true","fetch_graph":"https://pith.science/api/pith-number/YWPRANFO6JPQ53GNFXKDGNZTEM/graph.json","fetch_events":"https://pith.science/api/pith-number/YWPRANFO6JPQ53GNFXKDGNZTEM/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/YWPRANFO6JPQ53GNFXKDGNZTEM/action/timestamp_anchor","attest_storage":"https://pith.science/pith/YWPRANFO6JPQ53GNFXKDGNZTEM/action/storage_attestation","attest_author":"https://pith.science/pith/YWPRANFO6JPQ53GNFXKDGNZTEM/action/author_attestation","sign_citation":"https://pith.science/pith/YWPRANFO6JPQ53GNFXKDGNZTEM/action/citation_signature","submit_replication":"https://pith.science/pith/YWPRANFO6JPQ53GNFXKDGNZTEM/action/replication_record"}},"created_at":"2026-05-18T01:40:18.133746+00:00","updated_at":"2026-05-18T01:40:18.133746+00:00"}