{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:1999:GFZWZSEOGEJI5UIX4P276OJUPQ","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":"420a85aedd11c80abbeed8c6550635e8748ccbc1052f3b3795f72ec77989fffa","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"1999-03-15T00:27:29Z","title_canon_sha256":"eabdb6d54e332b1f62ad08527571ecb8beeaa76908689d3c20f1aabc1b18e82e"},"schema_version":"1.0","source":{"id":"astro-ph/9903217","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/9903217","created_at":"2026-07-04T16:10:47Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/9903217v1","created_at":"2026-07-04T16:10:47Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/9903217","created_at":"2026-07-04T16:10:47Z"},{"alias_kind":"pith_short_12","alias_value":"GFZWZSEOGEJI","created_at":"2026-07-04T16:10:47Z"},{"alias_kind":"pith_short_16","alias_value":"GFZWZSEOGEJI5UIX","created_at":"2026-07-04T16:10:47Z"},{"alias_kind":"pith_short_8","alias_value":"GFZWZSEO","created_at":"2026-07-04T16:10:47Z"}],"graph_snapshots":[{"event_id":"sha256:e1352e8eae0792361916369f8e19cd8917d9e3d09199c8338a1f93a02eb0c653","target":"graph","created_at":"2026-07-04T16:10:47Z","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/9903217/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present a CCD-based photometric survey covering 870 sq. arcmin in a young stellar cluster around the young multiple star sigma Orionis. Our survey limiting R, I, and Z magnitudes are 23.2, 21.8, and 21.0, respectively. From our colour-magnitude diagrams, we have selected 49 faint objects, which smoothly extrapolate the photometric sequence defined by more massive known members. Adopting the currently accepted age interval of 2-10 Myr for the Orion 1b association and considering recent evolutionary models, our objects may span a mass range from 0.1 down to 0.02 Msun, well within the substell","authors_text":"M. R. Zapatero Osorio, R. Rebolo, V. J. S. Bejar","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"1999-03-15T00:27:29Z","title":"A Search for Very Low-mass Stars and Brown Dwarfs in the Young sigma Orionis Cluster"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9903217","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":"sha256:75da03327bd96fa3b7a9a020941f91828e3955fe6251d2ea071868fc1f629849","target":"record","created_at":"2026-07-04T16:10:47Z","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":"420a85aedd11c80abbeed8c6550635e8748ccbc1052f3b3795f72ec77989fffa","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"1999-03-15T00:27:29Z","title_canon_sha256":"eabdb6d54e332b1f62ad08527571ecb8beeaa76908689d3c20f1aabc1b18e82e"},"schema_version":"1.0","source":{"id":"astro-ph/9903217","kind":"arxiv","version":1}},"canonical_sha256":"31736cc88e31128ed117e3f5ff39347c1b7f20d382ece624d4c7df78b4dcc6cb","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"31736cc88e31128ed117e3f5ff39347c1b7f20d382ece624d4c7df78b4dcc6cb","first_computed_at":"2026-07-04T16:10:47.745787Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T16:10:47.745787Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"zL9JB997jgF9gxs4ps/JVv6BCZxBlJapky+nYXnvSbsPwONgSnZn+LzIFcjggpzTEqQzgEXhxHndUIBITACtBQ==","signature_status":"signed_v1","signed_at":"2026-07-04T16:10:47.746189Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/9903217","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:75da03327bd96fa3b7a9a020941f91828e3955fe6251d2ea071868fc1f629849","sha256:e1352e8eae0792361916369f8e19cd8917d9e3d09199c8338a1f93a02eb0c653"],"state_sha256":"41a523850d80fe5faa03a79b4319bb83d0ebe7c372c8540a5332cd4a32cd6d10"}