{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:5NI6JK744TCXA2DKFGEFL326Z3","short_pith_number":"pith:5NI6JK74","canonical_record":{"source":{"id":"1601.03099","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-01-12T23:29:31Z","cross_cats_sorted":[],"title_canon_sha256":"7980d3dd9a080e59702baa7aff86e4b3598b91a94adf0b783e17e8e7d41a8ff4","abstract_canon_sha256":"58537e2f87af1811bd3d65a5a011fb721eef81e44bc33395ac75fe6b4b042b36"},"schema_version":"1.0"},"canonical_sha256":"eb51e4abfce4c570686a298855ef5ecedefe0b3e7fe7e40605e2183ba2f1e074","source":{"kind":"arxiv","id":"1601.03099","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1601.03099","created_at":"2026-05-18T01:01:58Z"},{"alias_kind":"arxiv_version","alias_value":"1601.03099v1","created_at":"2026-05-18T01:01:58Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1601.03099","created_at":"2026-05-18T01:01:58Z"},{"alias_kind":"pith_short_12","alias_value":"5NI6JK744TCX","created_at":"2026-05-18T12:30:01Z"},{"alias_kind":"pith_short_16","alias_value":"5NI6JK744TCXA2DK","created_at":"2026-05-18T12:30:01Z"},{"alias_kind":"pith_short_8","alias_value":"5NI6JK74","created_at":"2026-05-18T12:30:01Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:5NI6JK744TCXA2DKFGEFL326Z3","target":"record","payload":{"canonical_record":{"source":{"id":"1601.03099","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-01-12T23:29:31Z","cross_cats_sorted":[],"title_canon_sha256":"7980d3dd9a080e59702baa7aff86e4b3598b91a94adf0b783e17e8e7d41a8ff4","abstract_canon_sha256":"58537e2f87af1811bd3d65a5a011fb721eef81e44bc33395ac75fe6b4b042b36"},"schema_version":"1.0"},"canonical_sha256":"eb51e4abfce4c570686a298855ef5ecedefe0b3e7fe7e40605e2183ba2f1e074","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:01:58.096256Z","signature_b64":"KKkSC/Kw/vu+W8t8IZ/gN5r5iy6W0H6EekkYsmxhmsOWGQmDPW6lKLYh8rWH2iyYelldN2zxN7cUhe9JT5ZqDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"eb51e4abfce4c570686a298855ef5ecedefe0b3e7fe7e40605e2183ba2f1e074","last_reissued_at":"2026-05-18T01:01:58.095617Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:01:58.095617Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1601.03099","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":"2026-05-18T01:01:58Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QKtepGIkZzhYkpPYptmHYR1Osw6gJRr2+ecfBdZkOlGaxel4fV8A8Yn+5WGn/SxSqrDKgALGnMDfmjmEg4PXCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T04:07:57.651107Z"},"content_sha256":"d94be43019da8f9eb52caadcc6576274d7cf20f01b3fc187bb86adb1b15bea00","schema_version":"1.0","event_id":"sha256:d94be43019da8f9eb52caadcc6576274d7cf20f01b3fc187bb86adb1b15bea00"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:5NI6JK744TCXA2DKFGEFL326Z3","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Chemical abundance gradients from open clusters in the Milky Way disk: results from the APOGEE survey","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Ana Elia Garcia Perez, Anibal Garcia-Hernandez, Audrey Simmons, Benjamin Thompson, Brianne Meyer, Carlos Allende Prieto, Cristina Chiappini, David L. Nidever, Diogo Souto, Gail Zasowski, Jennifer A. Johnson, John Donor, Jon Holtzman, Julia O'Connell, Katia Cunha, Kelly M. Jackson, Mathias Schultheis, Matthew Shetrone, Michael R. Hayden, Olga Zamora, Peter M. Frinchaboy, Ricardo Carrera, Ricardo P. Schiavon, Steven R. Majewski, Szabolcs Meszaros, Verne V. Smith","submitted_at":"2016-01-12T23:29:31Z","abstract_excerpt":"Metallicity gradients provide strong constraints for understanding the chemical evolution of the Galaxy. We report on radial abundance gradients of Fe, Ni, Ca, Si, and Mg obtained from a sample of 304 red-giant members of 29 disk open clusters, mostly concentrated at galactocentric distances between ~8 - 15 kpc, but including two open clusters in the outer disk. The observations are from the APOGEE survey. The chemical abundances were derived automatically by the ASPCAP pipeline and these are part of the SDSS III Data Release 12. The gradients, obtained from least squares fits to the data, are"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1601.03099","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":"2026-05-18T01:01:58Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zG+rZhuUSfjXbheOzcs9ekSO8uWQHbaHEQpQVoy/CW3P9W5oxHaGYnlEOpiROdfZTW6MelO0wE8qbpg3eZ4MAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T04:07:57.651859Z"},"content_sha256":"fa8708d6fbbe7219b7b3b14a2d18da0efac14767af79546633e016efd6e4dd64","schema_version":"1.0","event_id":"sha256:fa8708d6fbbe7219b7b3b14a2d18da0efac14767af79546633e016efd6e4dd64"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/5NI6JK744TCXA2DKFGEFL326Z3/bundle.json","state_url":"https://pith.science/pith/5NI6JK744TCXA2DKFGEFL326Z3/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/5NI6JK744TCXA2DKFGEFL326Z3/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":"2026-05-26T04:07:57Z","links":{"resolver":"https://pith.science/pith/5NI6JK744TCXA2DKFGEFL326Z3","bundle":"https://pith.science/pith/5NI6JK744TCXA2DKFGEFL326Z3/bundle.json","state":"https://pith.science/pith/5NI6JK744TCXA2DKFGEFL326Z3/state.json","well_known_bundle":"https://pith.science/.well-known/pith/5NI6JK744TCXA2DKFGEFL326Z3/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:5NI6JK744TCXA2DKFGEFL326Z3","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":"58537e2f87af1811bd3d65a5a011fb721eef81e44bc33395ac75fe6b4b042b36","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-01-12T23:29:31Z","title_canon_sha256":"7980d3dd9a080e59702baa7aff86e4b3598b91a94adf0b783e17e8e7d41a8ff4"},"schema_version":"1.0","source":{"id":"1601.03099","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1601.03099","created_at":"2026-05-18T01:01:58Z"},{"alias_kind":"arxiv_version","alias_value":"1601.03099v1","created_at":"2026-05-18T01:01:58Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1601.03099","created_at":"2026-05-18T01:01:58Z"},{"alias_kind":"pith_short_12","alias_value":"5NI6JK744TCX","created_at":"2026-05-18T12:30:01Z"},{"alias_kind":"pith_short_16","alias_value":"5NI6JK744TCXA2DK","created_at":"2026-05-18T12:30:01Z"},{"alias_kind":"pith_short_8","alias_value":"5NI6JK74","created_at":"2026-05-18T12:30:01Z"}],"graph_snapshots":[{"event_id":"sha256:fa8708d6fbbe7219b7b3b14a2d18da0efac14767af79546633e016efd6e4dd64","target":"graph","created_at":"2026-05-18T01:01:58Z","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":"Metallicity gradients provide strong constraints for understanding the chemical evolution of the Galaxy. We report on radial abundance gradients of Fe, Ni, Ca, Si, and Mg obtained from a sample of 304 red-giant members of 29 disk open clusters, mostly concentrated at galactocentric distances between ~8 - 15 kpc, but including two open clusters in the outer disk. The observations are from the APOGEE survey. The chemical abundances were derived automatically by the ASPCAP pipeline and these are part of the SDSS III Data Release 12. The gradients, obtained from least squares fits to the data, are","authors_text":"Ana Elia Garcia Perez, Anibal Garcia-Hernandez, Audrey Simmons, Benjamin Thompson, Brianne Meyer, Carlos Allende Prieto, Cristina Chiappini, David L. Nidever, Diogo Souto, Gail Zasowski, Jennifer A. Johnson, John Donor, Jon Holtzman, Julia O'Connell, Katia Cunha, Kelly M. Jackson, Mathias Schultheis, Matthew Shetrone, Michael R. Hayden, Olga Zamora, Peter M. Frinchaboy, Ricardo Carrera, Ricardo P. Schiavon, Steven R. Majewski, Szabolcs Meszaros, Verne V. Smith","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-01-12T23:29:31Z","title":"Chemical abundance gradients from open clusters in the Milky Way disk: results from the APOGEE survey"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1601.03099","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:d94be43019da8f9eb52caadcc6576274d7cf20f01b3fc187bb86adb1b15bea00","target":"record","created_at":"2026-05-18T01:01:58Z","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":"58537e2f87af1811bd3d65a5a011fb721eef81e44bc33395ac75fe6b4b042b36","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-01-12T23:29:31Z","title_canon_sha256":"7980d3dd9a080e59702baa7aff86e4b3598b91a94adf0b783e17e8e7d41a8ff4"},"schema_version":"1.0","source":{"id":"1601.03099","kind":"arxiv","version":1}},"canonical_sha256":"eb51e4abfce4c570686a298855ef5ecedefe0b3e7fe7e40605e2183ba2f1e074","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"eb51e4abfce4c570686a298855ef5ecedefe0b3e7fe7e40605e2183ba2f1e074","first_computed_at":"2026-05-18T01:01:58.095617Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:01:58.095617Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"KKkSC/Kw/vu+W8t8IZ/gN5r5iy6W0H6EekkYsmxhmsOWGQmDPW6lKLYh8rWH2iyYelldN2zxN7cUhe9JT5ZqDw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:01:58.096256Z","signed_message":"canonical_sha256_bytes"},"source_id":"1601.03099","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d94be43019da8f9eb52caadcc6576274d7cf20f01b3fc187bb86adb1b15bea00","sha256:fa8708d6fbbe7219b7b3b14a2d18da0efac14767af79546633e016efd6e4dd64"],"state_sha256":"abd3b5ca236a676c1a038f991e4adaceaec2f278f416efbe679142c174e60186"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"oVbaAENxtOWlwjjpvNFB5MsbEMyDu/zicMTY6kuWw5CzG0BYfnknSHgGwPmJvlHdb2ZDAAvABEObMv6ca/sqBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T04:07:57.655738Z","bundle_sha256":"9aa744f8dd78150eec99adaa82b393e8ebce4213e7073b60c2a04241d9bd4b7a"}}