{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:2YAWLEPF7ZOQHMKO4BVE4NRCS5","short_pith_number":"pith:2YAWLEPF","canonical_record":{"source":{"id":"1809.04002","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-09-11T16:13:43Z","cross_cats_sorted":[],"title_canon_sha256":"faab3baa434f4658900399f6ea62e5f295519312fe9407036fdee389e39345b2","abstract_canon_sha256":"18796a9963a1f6fad3b9c255f8b1ef3220dd887e5a9a6f68a719c78fc193eb95"},"schema_version":"1.0"},"canonical_sha256":"d6016591e5fe5d03b14ee06a4e36229763ef540c6d76a88d161301cab4bb170b","source":{"kind":"arxiv","id":"1809.04002","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1809.04002","created_at":"2026-05-18T00:04:54Z"},{"alias_kind":"arxiv_version","alias_value":"1809.04002v1","created_at":"2026-05-18T00:04:54Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1809.04002","created_at":"2026-05-18T00:04:54Z"},{"alias_kind":"pith_short_12","alias_value":"2YAWLEPF7ZOQ","created_at":"2026-05-18T12:32:02Z"},{"alias_kind":"pith_short_16","alias_value":"2YAWLEPF7ZOQHMKO","created_at":"2026-05-18T12:32:02Z"},{"alias_kind":"pith_short_8","alias_value":"2YAWLEPF","created_at":"2026-05-18T12:32:02Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:2YAWLEPF7ZOQHMKO4BVE4NRCS5","target":"record","payload":{"canonical_record":{"source":{"id":"1809.04002","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-09-11T16:13:43Z","cross_cats_sorted":[],"title_canon_sha256":"faab3baa434f4658900399f6ea62e5f295519312fe9407036fdee389e39345b2","abstract_canon_sha256":"18796a9963a1f6fad3b9c255f8b1ef3220dd887e5a9a6f68a719c78fc193eb95"},"schema_version":"1.0"},"canonical_sha256":"d6016591e5fe5d03b14ee06a4e36229763ef540c6d76a88d161301cab4bb170b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:04:54.661527Z","signature_b64":"buiswY6eA+Toj6wPX0COGH4m2fmunt4XWjDMimCG6c29GrVhJJaFacFTd7FMqamns9z+vRuGB2bqHwEuKWMPAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d6016591e5fe5d03b14ee06a4e36229763ef540c6d76a88d161301cab4bb170b","last_reissued_at":"2026-05-18T00:04:54.660865Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:04:54.660865Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1809.04002","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:04:54Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"MD2BIgFueAgPlSzDNlIiUwCHnBQXCJI6awlF/eIYlRfPj9gFWvzuRQhfet5NWYwahqHpcMfDfz7eAR/YixFVCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-12T08:47:15.939957Z"},"content_sha256":"f50d9ea2279b888bb009efe5e4828441fcd5313ed818782036aa29dfed4cd06c","schema_version":"1.0","event_id":"sha256:f50d9ea2279b888bb009efe5e4828441fcd5313ed818782036aa29dfed4cd06c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:2YAWLEPF7ZOQHMKO4BVE4NRCS5","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Co-spatial UV-optical HST/STIS Spectra of Six Planetary Nebulae: Nebular and Stellar Properties","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Bruce Balick, Karen B. Kwitter, Reginald J. Dufour, Richard A. Shaw, Richard B. C. Henry, Romano L. M. Corradi, Timothy R. Miller","submitted_at":"2018-09-11T16:13:43Z","abstract_excerpt":"This paper represents the conclusion of a project that had two main goals: (1) to investigate to what extent planetary nebulae (PNe) are chemically homogeneous; and (2) to provide physical constraints on the central star properties of each PN. We accomplished the first goal by using HST/STIS spectra to measure the abundances of seven elements in numerous spatial regions within each of six PN (IC 2165, IC 3568, NGC 2440, NGC 5315, NGC 5882, and NGC 7662). The second goal was achieved by computing a photoionization model of each nebula, using our observed emission line strengths as constraints. "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1809.04002","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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:04:54Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"iqisS4nX907qdH8Fctqba0kgikxXPGmHNFDjy5Hz7B62eCwILvKxblGDeQX6KB6gndU211WY6BHhcSej5KA5Dg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-12T08:47:15.940305Z"},"content_sha256":"5eacc19bacb3d23a5d2d8ddc3c1b42e79047096d7f743d29caf9785e75d17e97","schema_version":"1.0","event_id":"sha256:5eacc19bacb3d23a5d2d8ddc3c1b42e79047096d7f743d29caf9785e75d17e97"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/2YAWLEPF7ZOQHMKO4BVE4NRCS5/bundle.json","state_url":"https://pith.science/pith/2YAWLEPF7ZOQHMKO4BVE4NRCS5/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/2YAWLEPF7ZOQHMKO4BVE4NRCS5/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":"2026-06-12T08:47:15Z","links":{"resolver":"https://pith.science/pith/2YAWLEPF7ZOQHMKO4BVE4NRCS5","bundle":"https://pith.science/pith/2YAWLEPF7ZOQHMKO4BVE4NRCS5/bundle.json","state":"https://pith.science/pith/2YAWLEPF7ZOQHMKO4BVE4NRCS5/state.json","well_known_bundle":"https://pith.science/.well-known/pith/2YAWLEPF7ZOQHMKO4BVE4NRCS5/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:2YAWLEPF7ZOQHMKO4BVE4NRCS5","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":"18796a9963a1f6fad3b9c255f8b1ef3220dd887e5a9a6f68a719c78fc193eb95","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-09-11T16:13:43Z","title_canon_sha256":"faab3baa434f4658900399f6ea62e5f295519312fe9407036fdee389e39345b2"},"schema_version":"1.0","source":{"id":"1809.04002","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1809.04002","created_at":"2026-05-18T00:04:54Z"},{"alias_kind":"arxiv_version","alias_value":"1809.04002v1","created_at":"2026-05-18T00:04:54Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1809.04002","created_at":"2026-05-18T00:04:54Z"},{"alias_kind":"pith_short_12","alias_value":"2YAWLEPF7ZOQ","created_at":"2026-05-18T12:32:02Z"},{"alias_kind":"pith_short_16","alias_value":"2YAWLEPF7ZOQHMKO","created_at":"2026-05-18T12:32:02Z"},{"alias_kind":"pith_short_8","alias_value":"2YAWLEPF","created_at":"2026-05-18T12:32:02Z"}],"graph_snapshots":[{"event_id":"sha256:5eacc19bacb3d23a5d2d8ddc3c1b42e79047096d7f743d29caf9785e75d17e97","target":"graph","created_at":"2026-05-18T00:04:54Z","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"},"paper":{"abstract_excerpt":"This paper represents the conclusion of a project that had two main goals: (1) to investigate to what extent planetary nebulae (PNe) are chemically homogeneous; and (2) to provide physical constraints on the central star properties of each PN. We accomplished the first goal by using HST/STIS spectra to measure the abundances of seven elements in numerous spatial regions within each of six PN (IC 2165, IC 3568, NGC 2440, NGC 5315, NGC 5882, and NGC 7662). The second goal was achieved by computing a photoionization model of each nebula, using our observed emission line strengths as constraints. ","authors_text":"Bruce Balick, Karen B. Kwitter, Reginald J. Dufour, Richard A. Shaw, Richard B. C. Henry, Romano L. M. Corradi, Timothy R. Miller","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-09-11T16:13:43Z","title":"Co-spatial UV-optical HST/STIS Spectra of Six Planetary Nebulae: Nebular and Stellar Properties"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1809.04002","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:f50d9ea2279b888bb009efe5e4828441fcd5313ed818782036aa29dfed4cd06c","target":"record","created_at":"2026-05-18T00:04:54Z","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":"18796a9963a1f6fad3b9c255f8b1ef3220dd887e5a9a6f68a719c78fc193eb95","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-09-11T16:13:43Z","title_canon_sha256":"faab3baa434f4658900399f6ea62e5f295519312fe9407036fdee389e39345b2"},"schema_version":"1.0","source":{"id":"1809.04002","kind":"arxiv","version":1}},"canonical_sha256":"d6016591e5fe5d03b14ee06a4e36229763ef540c6d76a88d161301cab4bb170b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d6016591e5fe5d03b14ee06a4e36229763ef540c6d76a88d161301cab4bb170b","first_computed_at":"2026-05-18T00:04:54.660865Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:04:54.660865Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"buiswY6eA+Toj6wPX0COGH4m2fmunt4XWjDMimCG6c29GrVhJJaFacFTd7FMqamns9z+vRuGB2bqHwEuKWMPAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:04:54.661527Z","signed_message":"canonical_sha256_bytes"},"source_id":"1809.04002","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f50d9ea2279b888bb009efe5e4828441fcd5313ed818782036aa29dfed4cd06c","sha256:5eacc19bacb3d23a5d2d8ddc3c1b42e79047096d7f743d29caf9785e75d17e97"],"state_sha256":"7f4254e625667093704f4b9254c9bb630ddbe2a9e9a0c92f3804f524bf6faf2d"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"EPLaHPhy+gKx+Av7pitxK+9kb5dS9xcqay0mCdBi3pstmulGj9bcScJqdP9gZdY/nBNEP4KkTl4T88yucMfxDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-12T08:47:15.942503Z","bundle_sha256":"2ba8992d76a1a1eb06c1dbef780a1a45bc1ad2db3264647f091afa28aebc9229"}}