{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:JBEDRXOYOPQD5X2VFCPPQ2AWE4","short_pith_number":"pith:JBEDRXOY","canonical_record":{"source":{"id":"1901.09589","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2019-01-28T10:40:40Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"9affca4e05b50c387d8ae7f36f7bb02835ed95bd33834ceae2472029a2064502","abstract_canon_sha256":"06120dae9c641547079a96a9c63bd8c3aa82f046760a2c5510d6a753a11803d4"},"schema_version":"1.0"},"canonical_sha256":"484838ddd873e03edf55289ef8681627156e89e9261844645a547537aaea88ca","source":{"kind":"arxiv","id":"1901.09589","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1901.09589","created_at":"2026-05-17T23:50:08Z"},{"alias_kind":"arxiv_version","alias_value":"1901.09589v1","created_at":"2026-05-17T23:50:08Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1901.09589","created_at":"2026-05-17T23:50:08Z"},{"alias_kind":"pith_short_12","alias_value":"JBEDRXOYOPQD","created_at":"2026-05-18T12:33:18Z"},{"alias_kind":"pith_short_16","alias_value":"JBEDRXOYOPQD5X2V","created_at":"2026-05-18T12:33:18Z"},{"alias_kind":"pith_short_8","alias_value":"JBEDRXOY","created_at":"2026-05-18T12:33:18Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:JBEDRXOYOPQD5X2VFCPPQ2AWE4","target":"record","payload":{"canonical_record":{"source":{"id":"1901.09589","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2019-01-28T10:40:40Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"9affca4e05b50c387d8ae7f36f7bb02835ed95bd33834ceae2472029a2064502","abstract_canon_sha256":"06120dae9c641547079a96a9c63bd8c3aa82f046760a2c5510d6a753a11803d4"},"schema_version":"1.0"},"canonical_sha256":"484838ddd873e03edf55289ef8681627156e89e9261844645a547537aaea88ca","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:50:08.365566Z","signature_b64":"Arr6+38OvVTcHLA5LpoUt7wfPHgBmA6xbXjDaZpfGJ1hpk2lNFHKZWfbb5Ixzo5Ym/0RLUXJFJTtKRT/iv5UDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"484838ddd873e03edf55289ef8681627156e89e9261844645a547537aaea88ca","last_reissued_at":"2026-05-17T23:50:08.365076Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:50:08.365076Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1901.09589","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":"2026-05-17T23:50:08Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/7oPlBPgtWA9cs3BxfGm5A0tic8GMsuS7pc1KTLAvFCiLwdGBVdcO6h4brm3ahcgTBcHSsaEHDPxP0r+QkzmDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-16T04:40:56.316549Z"},"content_sha256":"470c8df270b7bebe981ec7e5e520dee6ce14c5f1fccfdab13ba50286ebfd8165","schema_version":"1.0","event_id":"sha256:470c8df270b7bebe981ec7e5e520dee6ce14c5f1fccfdab13ba50286ebfd8165"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:JBEDRXOYOPQD5X2VFCPPQ2AWE4","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The Gaia-ESO Survey: age spread in the star forming region NGC6530 from the HR diagram and gravity indicators","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.SR","authors_text":"A. Frasca, A. Gonneau, A. Hourihane, A. Klutsch, A. Lanzafame, C.C. Worley, E. Flaccomio, E. Franciosini, E. J. Alfaro, E. Pancino, E. Tognelli, F. Damiani, F. M. Jim\\'enez-Esteban, G. Carraro, G. Gilmore, G. G. Sacco, G. Micela, G. Tautvai\\v{s}ien\\.e, J. Lewis, J. S. Vink, L. Magrini, L. Monaco, L. Morbidelli, L. Prisinzano, M. Bergemann, M. G. Guarcello, N. J. Wright, P. Jofr\\'e, R. Bonito, R. Jeffries, R. J. Jackson, S. Koposov, S. Randich, S. Zaggia, V. Kalari, V. Roccatagliata","submitted_at":"2019-01-28T10:40:40Z","abstract_excerpt":"In very young clusters, stellar age distribution is the empirical proof of the duration of star formation (SF) and of the physical mechanisms involved in the process. We derived accurate stellar ages for the cluster NGC6530, associated with the Lagoon Nebula to infer its SF history. We use the Gaia-ESO survey observations and Gaia DR2 data, to derive cluster membership and fundamental stellar parameters. We identified 652 confirmed and 9 probable members. The reddening inferred for members and non-members allows us to distinguish MS stars and giants, in agreement with the distances inferred fr"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1901.09589","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":"2026-05-17T23:50:08Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ECI+3Xm1BbzbwFrZJhsE2l7nSLS93aQ8cEz8QEuPpuptY2c8J6xoZv2L5Ux2X78gQ998sROjm9gjTu8dwIPcAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-16T04:40:56.316917Z"},"content_sha256":"f96563a2c3aa5bcbacf5754bef7ccc95d55af0f1a79e0f719904608236ad0c7a","schema_version":"1.0","event_id":"sha256:f96563a2c3aa5bcbacf5754bef7ccc95d55af0f1a79e0f719904608236ad0c7a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/JBEDRXOYOPQD5X2VFCPPQ2AWE4/bundle.json","state_url":"https://pith.science/pith/JBEDRXOYOPQD5X2VFCPPQ2AWE4/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/JBEDRXOYOPQD5X2VFCPPQ2AWE4/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":"2026-07-16T04:40:56Z","links":{"resolver":"https://pith.science/pith/JBEDRXOYOPQD5X2VFCPPQ2AWE4","bundle":"https://pith.science/pith/JBEDRXOYOPQD5X2VFCPPQ2AWE4/bundle.json","state":"https://pith.science/pith/JBEDRXOYOPQD5X2VFCPPQ2AWE4/state.json","well_known_bundle":"https://pith.science/.well-known/pith/JBEDRXOYOPQD5X2VFCPPQ2AWE4/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:JBEDRXOYOPQD5X2VFCPPQ2AWE4","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":"06120dae9c641547079a96a9c63bd8c3aa82f046760a2c5510d6a753a11803d4","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2019-01-28T10:40:40Z","title_canon_sha256":"9affca4e05b50c387d8ae7f36f7bb02835ed95bd33834ceae2472029a2064502"},"schema_version":"1.0","source":{"id":"1901.09589","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1901.09589","created_at":"2026-05-17T23:50:08Z"},{"alias_kind":"arxiv_version","alias_value":"1901.09589v1","created_at":"2026-05-17T23:50:08Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1901.09589","created_at":"2026-05-17T23:50:08Z"},{"alias_kind":"pith_short_12","alias_value":"JBEDRXOYOPQD","created_at":"2026-05-18T12:33:18Z"},{"alias_kind":"pith_short_16","alias_value":"JBEDRXOYOPQD5X2V","created_at":"2026-05-18T12:33:18Z"},{"alias_kind":"pith_short_8","alias_value":"JBEDRXOY","created_at":"2026-05-18T12:33:18Z"}],"graph_snapshots":[{"event_id":"sha256:f96563a2c3aa5bcbacf5754bef7ccc95d55af0f1a79e0f719904608236ad0c7a","target":"graph","created_at":"2026-05-17T23:50:08Z","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":"In very young clusters, stellar age distribution is the empirical proof of the duration of star formation (SF) and of the physical mechanisms involved in the process. We derived accurate stellar ages for the cluster NGC6530, associated with the Lagoon Nebula to infer its SF history. We use the Gaia-ESO survey observations and Gaia DR2 data, to derive cluster membership and fundamental stellar parameters. We identified 652 confirmed and 9 probable members. The reddening inferred for members and non-members allows us to distinguish MS stars and giants, in agreement with the distances inferred fr","authors_text":"A. Frasca, A. Gonneau, A. Hourihane, A. Klutsch, A. Lanzafame, C.C. Worley, E. Flaccomio, E. Franciosini, E. J. Alfaro, E. Pancino, E. Tognelli, F. Damiani, F. M. Jim\\'enez-Esteban, G. Carraro, G. Gilmore, G. G. Sacco, G. Micela, G. Tautvai\\v{s}ien\\.e, J. Lewis, J. S. Vink, L. Magrini, L. Monaco, L. Morbidelli, L. Prisinzano, M. Bergemann, M. G. Guarcello, N. J. Wright, P. Jofr\\'e, R. Bonito, R. Jeffries, R. J. Jackson, S. Koposov, S. Randich, S. Zaggia, V. Kalari, V. Roccatagliata","cross_cats":["astro-ph.GA"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2019-01-28T10:40:40Z","title":"The Gaia-ESO Survey: age spread in the star forming region NGC6530 from the HR diagram and gravity indicators"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1901.09589","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":"sha256:470c8df270b7bebe981ec7e5e520dee6ce14c5f1fccfdab13ba50286ebfd8165","target":"record","created_at":"2026-05-17T23:50:08Z","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":"06120dae9c641547079a96a9c63bd8c3aa82f046760a2c5510d6a753a11803d4","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2019-01-28T10:40:40Z","title_canon_sha256":"9affca4e05b50c387d8ae7f36f7bb02835ed95bd33834ceae2472029a2064502"},"schema_version":"1.0","source":{"id":"1901.09589","kind":"arxiv","version":1}},"canonical_sha256":"484838ddd873e03edf55289ef8681627156e89e9261844645a547537aaea88ca","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"484838ddd873e03edf55289ef8681627156e89e9261844645a547537aaea88ca","first_computed_at":"2026-05-17T23:50:08.365076Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:50:08.365076Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Arr6+38OvVTcHLA5LpoUt7wfPHgBmA6xbXjDaZpfGJ1hpk2lNFHKZWfbb5Ixzo5Ym/0RLUXJFJTtKRT/iv5UDg==","signature_status":"signed_v1","signed_at":"2026-05-17T23:50:08.365566Z","signed_message":"canonical_sha256_bytes"},"source_id":"1901.09589","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:470c8df270b7bebe981ec7e5e520dee6ce14c5f1fccfdab13ba50286ebfd8165","sha256:f96563a2c3aa5bcbacf5754bef7ccc95d55af0f1a79e0f719904608236ad0c7a"],"state_sha256":"bed3376a76b5b7de8f0037d9657227666c8acc924e3f9387f7e0ce87d222c015"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"JxdxbgTDZSDwtG6XOfg0kVxPFN63nuyJZYOJ1VbzVyW0OC9Zy/2i4j0fV7TWAkMBhQ7stwozqGKHxAcFVRIZDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-16T04:40:56.319075Z","bundle_sha256":"0ecfbc5effde5cc81c9dc29fa9bb5aa5d51bbc453a0487b98122fcfe57b57e7a"}}