{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:D6FG6AXW2BGEIW53N5PGQZKFA4","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":"6c49132d100c43b534bacb6a852f08d2b279368b27a77c03a1d48b07ba8bc0b0","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2009-06-17T05:36:16Z","title_canon_sha256":"c9e6de87f114175ab99cf734764cb4cc8a1f91bb03997699f0dede1bd91ab667"},"schema_version":"1.0","source":{"id":"0906.3072","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0906.3072","created_at":"2026-05-18T02:13:19Z"},{"alias_kind":"arxiv_version","alias_value":"0906.3072v1","created_at":"2026-05-18T02:13:19Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0906.3072","created_at":"2026-05-18T02:13:19Z"},{"alias_kind":"pith_short_12","alias_value":"D6FG6AXW2BGE","created_at":"2026-05-18T12:25:59Z"},{"alias_kind":"pith_short_16","alias_value":"D6FG6AXW2BGEIW53","created_at":"2026-05-18T12:25:59Z"},{"alias_kind":"pith_short_8","alias_value":"D6FG6AXW","created_at":"2026-05-18T12:25:59Z"}],"graph_snapshots":[{"event_id":"sha256:2de0267de6227fb424920cb4fa2c68c03e5eef1d47afc0f5fd7d40d86da34944","target":"graph","created_at":"2026-05-18T02:13:19Z","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"},"paper":{"abstract_excerpt":"We have performed mid-IR photometry of the young open cluster NGC 2264 using the images obtained with the Spitzer Space Telescope IRAC and MIPS instruments and present a normalized classification scheme of young stellar objects in various color-color diagrams to make full use of the information from multicolor photometry. These results are compared with the classification scheme based on the slope of the spectral energy distribution (SED).\n  From the spatial distributions of Class I and II stars, we have identified two subclusterings of Class I objects in the CONE region of Sung et al. The dis","authors_text":"ANU, Australia), Caltech, Hwankyung Sung (Sejong Univ., Korea) John R. Stauffer (SSC, USA) Mike S. Bessell (MSSSO","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2009-06-17T05:36:16Z","title":"A Spitzer View of the Young Open Cluster NGC 2264"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0906.3072","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:a51a842549af9db8d829256608e9e1fbd379b1194487640c22e7eff6d5aefd1a","target":"record","created_at":"2026-05-18T02:13:19Z","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":"6c49132d100c43b534bacb6a852f08d2b279368b27a77c03a1d48b07ba8bc0b0","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2009-06-17T05:36:16Z","title_canon_sha256":"c9e6de87f114175ab99cf734764cb4cc8a1f91bb03997699f0dede1bd91ab667"},"schema_version":"1.0","source":{"id":"0906.3072","kind":"arxiv","version":1}},"canonical_sha256":"1f8a6f02f6d04c445bbb6f5e68654507125811a85575e7c4f152ec73350762ca","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"1f8a6f02f6d04c445bbb6f5e68654507125811a85575e7c4f152ec73350762ca","first_computed_at":"2026-05-18T02:13:19.561998Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:13:19.561998Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"wV6s+/06IiPMK+t1GXDWUA0xJfaLI6dZpuTI2Z6m4JeJXefwyNT5LcZ9+9U3aGByt+D08hMmQzWvm1dFXVOgBw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:13:19.562512Z","signed_message":"canonical_sha256_bytes"},"source_id":"0906.3072","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a51a842549af9db8d829256608e9e1fbd379b1194487640c22e7eff6d5aefd1a","sha256:2de0267de6227fb424920cb4fa2c68c03e5eef1d47afc0f5fd7d40d86da34944"],"state_sha256":"7f471a6f11507a9dfe75a6c72e1941f32e61b35ce08fa4ee4adca9b37871697a"}