{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:GMS6YH3Z3HLNSMX7NKAW565YFH","short_pith_number":"pith:GMS6YH3Z","canonical_record":{"source":{"id":"1804.08321","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-04-23T10:22:03Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"4f849ad0cd5dfcd963a8435fd0345d34526f9343114097c6f5e1b65004efaab2","abstract_canon_sha256":"bc3e3baccd22263f368a897b4dc06746196e1bdfe02a6ae5b637c82eb6cadb56"},"schema_version":"1.0"},"canonical_sha256":"3325ec1f79d9d6d932ff6a816efbb829fec0d45075714dc919182add0d96ec54","source":{"kind":"arxiv","id":"1804.08321","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1804.08321","created_at":"2026-05-17T23:55:14Z"},{"alias_kind":"arxiv_version","alias_value":"1804.08321v2","created_at":"2026-05-17T23:55:14Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1804.08321","created_at":"2026-05-17T23:55:14Z"},{"alias_kind":"pith_short_12","alias_value":"GMS6YH3Z3HLN","created_at":"2026-05-18T12:32:25Z"},{"alias_kind":"pith_short_16","alias_value":"GMS6YH3Z3HLNSMX7","created_at":"2026-05-18T12:32:25Z"},{"alias_kind":"pith_short_8","alias_value":"GMS6YH3Z","created_at":"2026-05-18T12:32:25Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:GMS6YH3Z3HLNSMX7NKAW565YFH","target":"record","payload":{"canonical_record":{"source":{"id":"1804.08321","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-04-23T10:22:03Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"4f849ad0cd5dfcd963a8435fd0345d34526f9343114097c6f5e1b65004efaab2","abstract_canon_sha256":"bc3e3baccd22263f368a897b4dc06746196e1bdfe02a6ae5b637c82eb6cadb56"},"schema_version":"1.0"},"canonical_sha256":"3325ec1f79d9d6d932ff6a816efbb829fec0d45075714dc919182add0d96ec54","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:55:14.773882Z","signature_b64":"6kfSfkwwKljY9MDz+YtPl7vvaqHYF3eUSvzTBFqOsWR6UsfK4AQp4B2vdAuKAgY1ltoh56XyeL+XAgEQoxmYCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3325ec1f79d9d6d932ff6a816efbb829fec0d45075714dc919182add0d96ec54","last_reissued_at":"2026-05-17T23:55:14.773299Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:55:14.773299Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1804.08321","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-17T23:55:14Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3SO5pDxFdnsL78KkgwskwO0xe00DU96RgiiJVIB3hVR17Y+xx6oWYoq+A25nZ55pmyf0VO+HX5spbRtYpeTNAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T06:19:08.407579Z"},"content_sha256":"353239b23d5b9eed3a9dd4af429e1fb06a2f4aa29d1937fe2e190237194a0548","schema_version":"1.0","event_id":"sha256:353239b23d5b9eed3a9dd4af429e1fb06a2f4aa29d1937fe2e190237194a0548"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:GMS6YH3Z3HLNSMX7NKAW565YFH","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Estimating stellar ages and metallicities from parallaxes and broadband photometry - successes and shortcomings","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.SR","authors_text":"Lennart Lindegren, Louise M. Howes, Ross P. Church, Sofia Feltzing, Thomas Bensby","submitted_at":"2018-04-23T10:22:03Z","abstract_excerpt":"A deep understanding of the Milky Way galaxy, its formation and evolution requires observations of huge numbers of stars. Stellar photometry, therefore, provides an economical method to obtain intrinsic stellar parameters. With the addition of distance information - deriving reliable ages from photometry is a possibility. We have developed a Bayesian method that generates 2D probability maps of a star's age and metallicity from photometry and parallax using isochrones. Our synthetic tests show that including a near-UV passband enables us to break the degeneracy between a star's age and metalli"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1804.08321","kind":"arxiv","version":2},"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":"2026-05-17T23:55:14Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"hxRW8hy8nTLscCOwOuVldgg/tXfs4AXJ9UdtKZ76KLRNJ0szsFO2QfCNhP5yudJSXuA9W7B8f8aFMKR+zr+nBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T06:19:08.408015Z"},"content_sha256":"57874bd4a23db281afb924069e820b513bc721ad2076ff84e4cf748493d46565","schema_version":"1.0","event_id":"sha256:57874bd4a23db281afb924069e820b513bc721ad2076ff84e4cf748493d46565"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/GMS6YH3Z3HLNSMX7NKAW565YFH/bundle.json","state_url":"https://pith.science/pith/GMS6YH3Z3HLNSMX7NKAW565YFH/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/GMS6YH3Z3HLNSMX7NKAW565YFH/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":"2026-05-26T06:19:08Z","links":{"resolver":"https://pith.science/pith/GMS6YH3Z3HLNSMX7NKAW565YFH","bundle":"https://pith.science/pith/GMS6YH3Z3HLNSMX7NKAW565YFH/bundle.json","state":"https://pith.science/pith/GMS6YH3Z3HLNSMX7NKAW565YFH/state.json","well_known_bundle":"https://pith.science/.well-known/pith/GMS6YH3Z3HLNSMX7NKAW565YFH/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:GMS6YH3Z3HLNSMX7NKAW565YFH","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":"bc3e3baccd22263f368a897b4dc06746196e1bdfe02a6ae5b637c82eb6cadb56","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-04-23T10:22:03Z","title_canon_sha256":"4f849ad0cd5dfcd963a8435fd0345d34526f9343114097c6f5e1b65004efaab2"},"schema_version":"1.0","source":{"id":"1804.08321","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1804.08321","created_at":"2026-05-17T23:55:14Z"},{"alias_kind":"arxiv_version","alias_value":"1804.08321v2","created_at":"2026-05-17T23:55:14Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1804.08321","created_at":"2026-05-17T23:55:14Z"},{"alias_kind":"pith_short_12","alias_value":"GMS6YH3Z3HLN","created_at":"2026-05-18T12:32:25Z"},{"alias_kind":"pith_short_16","alias_value":"GMS6YH3Z3HLNSMX7","created_at":"2026-05-18T12:32:25Z"},{"alias_kind":"pith_short_8","alias_value":"GMS6YH3Z","created_at":"2026-05-18T12:32:25Z"}],"graph_snapshots":[{"event_id":"sha256:57874bd4a23db281afb924069e820b513bc721ad2076ff84e4cf748493d46565","target":"graph","created_at":"2026-05-17T23:55:14Z","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":"A deep understanding of the Milky Way galaxy, its formation and evolution requires observations of huge numbers of stars. Stellar photometry, therefore, provides an economical method to obtain intrinsic stellar parameters. With the addition of distance information - deriving reliable ages from photometry is a possibility. We have developed a Bayesian method that generates 2D probability maps of a star's age and metallicity from photometry and parallax using isochrones. Our synthetic tests show that including a near-UV passband enables us to break the degeneracy between a star's age and metalli","authors_text":"Lennart Lindegren, Louise M. Howes, Ross P. Church, Sofia Feltzing, Thomas Bensby","cross_cats":["astro-ph.GA"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-04-23T10:22:03Z","title":"Estimating stellar ages and metallicities from parallaxes and broadband photometry - successes and shortcomings"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1804.08321","kind":"arxiv","version":2},"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":"sha256:353239b23d5b9eed3a9dd4af429e1fb06a2f4aa29d1937fe2e190237194a0548","target":"record","created_at":"2026-05-17T23:55:14Z","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":"bc3e3baccd22263f368a897b4dc06746196e1bdfe02a6ae5b637c82eb6cadb56","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-04-23T10:22:03Z","title_canon_sha256":"4f849ad0cd5dfcd963a8435fd0345d34526f9343114097c6f5e1b65004efaab2"},"schema_version":"1.0","source":{"id":"1804.08321","kind":"arxiv","version":2}},"canonical_sha256":"3325ec1f79d9d6d932ff6a816efbb829fec0d45075714dc919182add0d96ec54","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3325ec1f79d9d6d932ff6a816efbb829fec0d45075714dc919182add0d96ec54","first_computed_at":"2026-05-17T23:55:14.773299Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:55:14.773299Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"6kfSfkwwKljY9MDz+YtPl7vvaqHYF3eUSvzTBFqOsWR6UsfK4AQp4B2vdAuKAgY1ltoh56XyeL+XAgEQoxmYCw==","signature_status":"signed_v1","signed_at":"2026-05-17T23:55:14.773882Z","signed_message":"canonical_sha256_bytes"},"source_id":"1804.08321","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:353239b23d5b9eed3a9dd4af429e1fb06a2f4aa29d1937fe2e190237194a0548","sha256:57874bd4a23db281afb924069e820b513bc721ad2076ff84e4cf748493d46565"],"state_sha256":"adb7ebec637b8876c938106af0310179fb7e60190bde309dc0a70dfa6a7e3ef4"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6btCLBWiXV9K+MWPQrpxkQnLuvEUZCMnI1Bu2zfFT0zmuMYQoo8UZXy2ATD9/Vbwe/DWVBXkM54H2AVZ9sB7AQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T06:19:08.410327Z","bundle_sha256":"b99c8091b63c1257bbe7278b5ba7a92ed67db16b1a76f79cfe61f70a9707e81c"}}