{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:1999:GY7RODV6IXYMKS37HMOJIPWNYG","short_pith_number":"pith:GY7RODV6","canonical_record":{"source":{"id":"astro-ph/9904271","kind":"arxiv","version":2},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"1999-04-21T00:01:29Z","cross_cats_sorted":[],"title_canon_sha256":"6ce53eddacfd6acf925caeb770add0d47445c80407ad2952dcb24ae6aa9e79ea","abstract_canon_sha256":"31d47a56254386a075a386fff8ad5f3d11d4995338b43d2cd856ad501b806aa6"},"schema_version":"1.0"},"canonical_sha256":"363f170ebe45f0c54b7f3b1c943ecdc1a711c78d4a96140694ec0a0a698e7721","source":{"kind":"arxiv","id":"astro-ph/9904271","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/9904271","created_at":"2026-07-04T16:10:54Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/9904271v2","created_at":"2026-07-04T16:10:54Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/9904271","created_at":"2026-07-04T16:10:54Z"},{"alias_kind":"pith_short_12","alias_value":"GY7RODV6IXYM","created_at":"2026-07-04T16:10:54Z"},{"alias_kind":"pith_short_16","alias_value":"GY7RODV6IXYMKS37","created_at":"2026-07-04T16:10:54Z"},{"alias_kind":"pith_short_8","alias_value":"GY7RODV6","created_at":"2026-07-04T16:10:54Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:1999:GY7RODV6IXYMKS37HMOJIPWNYG","target":"record","payload":{"canonical_record":{"source":{"id":"astro-ph/9904271","kind":"arxiv","version":2},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"1999-04-21T00:01:29Z","cross_cats_sorted":[],"title_canon_sha256":"6ce53eddacfd6acf925caeb770add0d47445c80407ad2952dcb24ae6aa9e79ea","abstract_canon_sha256":"31d47a56254386a075a386fff8ad5f3d11d4995338b43d2cd856ad501b806aa6"},"schema_version":"1.0"},"canonical_sha256":"363f170ebe45f0c54b7f3b1c943ecdc1a711c78d4a96140694ec0a0a698e7721","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T16:10:54.709550Z","signature_b64":"5/LRPe+FWX8HhCVU6FLG5BxvJdeztRx4dpakaogMIGsZsYN1+8deElYXY0ONrqDAFzFFKwqcdMs57+sbpJ5dAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"363f170ebe45f0c54b7f3b1c943ecdc1a711c78d4a96140694ec0a0a698e7721","last_reissued_at":"2026-07-04T16:10:54.709066Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T16:10:54.709066Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"astro-ph/9904271","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-04T16:10:54Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dYbyBrtye9bWoNK5qFlaty+bAsZXAWlhgyXLqW6Wbak0p5/abf4Vx4qVHer+rDBMrfXs9KUygRb/OqKfY1u4Cg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T02:20:20.623802Z"},"content_sha256":"f7698fc600a8dd4117703a8fb10a71a4e9f45fc1243aac8fa9fcd59114a483bf","schema_version":"1.0","event_id":"sha256:f7698fc600a8dd4117703a8fb10a71a4e9f45fc1243aac8fa9fcd59114a483bf"},{"event_type":"graph_snapshot","subject_pith_number":"pith:1999:GY7RODV6IXYMKS37HMOJIPWNYG","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A Black Hole in the X-Ray Nova Velorum 1993","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"A.G. Riess, A.V. Filippenko, D.C. Leonard, E.C. Moran, T. Matheson, W. Li","submitted_at":"1999-04-21T00:01:29Z","abstract_excerpt":"We have obtained 17 moderate-resolution (~2.5 A) optical spectra of the Galactic X-ray Nova Velorum 1993 in quiescence with the Keck-II telescope. The orbital period (P) is 0.285206 +/- 0.0000014 d, and the semiamplitude (K_2) is 475.4 +/- 5.9 km/s. Our derived mass function, f(M_1) = PK_2^3 /2 pi G = 3.17 +/- 0.12 M_sun, is close to the conventional absolute limiting mass for a neutron star (~ 3.0-3.2 M_sun) -- but if the orbital inclination i is less than 80 degrees (given the absences of eclipses), then M_1 is greater than 4.2-4.4 M_sun for nominal secondary-star masses of 0.5 M_sun (M0) to"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9904271","kind":"arxiv","version":2},"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/9904271/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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-04T16:10:54Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"uAGzVn1tUhhriRJQLEAG4mFHEoZK4uUpahWKxFZ6mvplNzaKLUb9NTeGPRdIi/qpCf0bBQ2bWQMJggRgJpuiBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T02:20:20.624174Z"},"content_sha256":"a99479b754be5068a93022a2dc21849e536e0d6d14c79a97750f319977bc003b","schema_version":"1.0","event_id":"sha256:a99479b754be5068a93022a2dc21849e536e0d6d14c79a97750f319977bc003b"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/GY7RODV6IXYMKS37HMOJIPWNYG/bundle.json","state_url":"https://pith.science/pith/GY7RODV6IXYMKS37HMOJIPWNYG/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/GY7RODV6IXYMKS37HMOJIPWNYG/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-08-05T02:20:20Z","links":{"resolver":"https://pith.science/pith/GY7RODV6IXYMKS37HMOJIPWNYG","bundle":"https://pith.science/pith/GY7RODV6IXYMKS37HMOJIPWNYG/bundle.json","state":"https://pith.science/pith/GY7RODV6IXYMKS37HMOJIPWNYG/state.json","well_known_bundle":"https://pith.science/.well-known/pith/GY7RODV6IXYMKS37HMOJIPWNYG/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:1999:GY7RODV6IXYMKS37HMOJIPWNYG","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":"31d47a56254386a075a386fff8ad5f3d11d4995338b43d2cd856ad501b806aa6","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"1999-04-21T00:01:29Z","title_canon_sha256":"6ce53eddacfd6acf925caeb770add0d47445c80407ad2952dcb24ae6aa9e79ea"},"schema_version":"1.0","source":{"id":"astro-ph/9904271","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/9904271","created_at":"2026-07-04T16:10:54Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/9904271v2","created_at":"2026-07-04T16:10:54Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/9904271","created_at":"2026-07-04T16:10:54Z"},{"alias_kind":"pith_short_12","alias_value":"GY7RODV6IXYM","created_at":"2026-07-04T16:10:54Z"},{"alias_kind":"pith_short_16","alias_value":"GY7RODV6IXYMKS37","created_at":"2026-07-04T16:10:54Z"},{"alias_kind":"pith_short_8","alias_value":"GY7RODV6","created_at":"2026-07-04T16:10:54Z"}],"graph_snapshots":[{"event_id":"sha256:a99479b754be5068a93022a2dc21849e536e0d6d14c79a97750f319977bc003b","target":"graph","created_at":"2026-07-04T16:10:54Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/astro-ph/9904271/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We have obtained 17 moderate-resolution (~2.5 A) optical spectra of the Galactic X-ray Nova Velorum 1993 in quiescence with the Keck-II telescope. The orbital period (P) is 0.285206 +/- 0.0000014 d, and the semiamplitude (K_2) is 475.4 +/- 5.9 km/s. Our derived mass function, f(M_1) = PK_2^3 /2 pi G = 3.17 +/- 0.12 M_sun, is close to the conventional absolute limiting mass for a neutron star (~ 3.0-3.2 M_sun) -- but if the orbital inclination i is less than 80 degrees (given the absences of eclipses), then M_1 is greater than 4.2-4.4 M_sun for nominal secondary-star masses of 0.5 M_sun (M0) to","authors_text":"A.G. Riess, A.V. Filippenko, D.C. Leonard, E.C. Moran, T. Matheson, W. Li","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"1999-04-21T00:01:29Z","title":"A Black Hole in the X-Ray Nova Velorum 1993"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9904271","kind":"arxiv","version":2},"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:f7698fc600a8dd4117703a8fb10a71a4e9f45fc1243aac8fa9fcd59114a483bf","target":"record","created_at":"2026-07-04T16:10:54Z","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":"31d47a56254386a075a386fff8ad5f3d11d4995338b43d2cd856ad501b806aa6","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"1999-04-21T00:01:29Z","title_canon_sha256":"6ce53eddacfd6acf925caeb770add0d47445c80407ad2952dcb24ae6aa9e79ea"},"schema_version":"1.0","source":{"id":"astro-ph/9904271","kind":"arxiv","version":2}},"canonical_sha256":"363f170ebe45f0c54b7f3b1c943ecdc1a711c78d4a96140694ec0a0a698e7721","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"363f170ebe45f0c54b7f3b1c943ecdc1a711c78d4a96140694ec0a0a698e7721","first_computed_at":"2026-07-04T16:10:54.709066Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T16:10:54.709066Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"5/LRPe+FWX8HhCVU6FLG5BxvJdeztRx4dpakaogMIGsZsYN1+8deElYXY0ONrqDAFzFFKwqcdMs57+sbpJ5dAA==","signature_status":"signed_v1","signed_at":"2026-07-04T16:10:54.709550Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/9904271","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f7698fc600a8dd4117703a8fb10a71a4e9f45fc1243aac8fa9fcd59114a483bf","sha256:a99479b754be5068a93022a2dc21849e536e0d6d14c79a97750f319977bc003b"],"state_sha256":"f8afb71415373e04c7312f45da75034ee20f89da7a610620c431bec3751ff367"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"YUY1WbnZzQZNSiA8gPHe7fKA9qrDtw+rfN3y2EhOYy1OXDA6/pzHeHaWvbs7EJCb32a93uBF/qoZaLEprjmvCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-05T02:20:20.626442Z","bundle_sha256":"4e29b62cb816169cb620a6045010062fc85ac209b3c1052b79a9fe8f96b616c3"}}