{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:UBKLBRU3V7C4WNPDRA4DLEYWWL","short_pith_number":"pith:UBKLBRU3","canonical_record":{"source":{"id":"0902.1039","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2009-02-06T09:51:02Z","cross_cats_sorted":["astro-ph.IM"],"title_canon_sha256":"b5fdcdf20a0d787f195bd3f99cb12cbbc0453c1045cdedacd108f0bb1a4609fb","abstract_canon_sha256":"4b7a49802c2f435505f20f32c4c88f45c452568a9d76f60c44128f35c7ff381e"},"schema_version":"1.0"},"canonical_sha256":"a054b0c69bafc5cb35e38838359316b2ca46976074960818e7da05716f89059c","source":{"kind":"arxiv","id":"0902.1039","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0902.1039","created_at":"2026-05-18T04:25:51Z"},{"alias_kind":"arxiv_version","alias_value":"0902.1039v1","created_at":"2026-05-18T04:25:51Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0902.1039","created_at":"2026-05-18T04:25:51Z"},{"alias_kind":"pith_short_12","alias_value":"UBKLBRU3V7C4","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_16","alias_value":"UBKLBRU3V7C4WNPD","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_8","alias_value":"UBKLBRU3","created_at":"2026-05-18T12:26:02Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:UBKLBRU3V7C4WNPDRA4DLEYWWL","target":"record","payload":{"canonical_record":{"source":{"id":"0902.1039","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2009-02-06T09:51:02Z","cross_cats_sorted":["astro-ph.IM"],"title_canon_sha256":"b5fdcdf20a0d787f195bd3f99cb12cbbc0453c1045cdedacd108f0bb1a4609fb","abstract_canon_sha256":"4b7a49802c2f435505f20f32c4c88f45c452568a9d76f60c44128f35c7ff381e"},"schema_version":"1.0"},"canonical_sha256":"a054b0c69bafc5cb35e38838359316b2ca46976074960818e7da05716f89059c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:25:51.397011Z","signature_b64":"xs2mScY/tHgg4ju7BHn43ORYa8CumXTFI6JGQlG5WwnElBFwdtecDMjVCWPL/yeXgxS+VOPU6SqvlRrdkDdJCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a054b0c69bafc5cb35e38838359316b2ca46976074960818e7da05716f89059c","last_reissued_at":"2026-05-18T04:25:51.396460Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:25:51.396460Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0902.1039","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":"2026-05-18T04:25:51Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2XhMYit/DIpL6OM7q2hhFC8kQ1IebYJwrUXxpzL33UZtFVueUxHSOpBHDhtAKH2LHLWMGszsPa6Si0Tdzx80Bw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T16:26:24.309669Z"},"content_sha256":"6e71b7e854f4fbd3a0826902ac1b87eafdbf5500ff6fe09becb895a810c94529","schema_version":"1.0","event_id":"sha256:6e71b7e854f4fbd3a0826902ac1b87eafdbf5500ff6fe09becb895a810c94529"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:UBKLBRU3V7C4WNPDRA4DLEYWWL","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Parallaxes and proper motions for 20 open clusters as based on the new Hipparcos catalogue","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.IM"],"primary_cat":"astro-ph.GA","authors_text":"Floor van Leeuwen","submitted_at":"2009-02-06T09:51:02Z","abstract_excerpt":"A new reduction of the astrometric data as produced by the Hipparcos mission has been published, claiming that the accuracies for nearly all stars brighter than magnitude $\\mathrm{Hp}=8$ are improved, by up to a factor 4, compared to the original catalogue. As correlations between the underlying abscissa residuals have also been reduced by more than an order of magnitude to an insignificant level, our ability to determine reliable parallaxes and proper motions for open clusters should be improved. The new Hipparcos astrometric catalogue is used to derive mean parallax and proper motion estimat"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0902.1039","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":"2026-05-18T04:25:51Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"p1C/pEA5iCLoeCYa+Ew4weJ11BnkZ93+VrsYaoF6Onv7DrKoEI+ogxxq/x09dnsN9KhaZFYmw0n3CqCh9yYTCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T16:26:24.310197Z"},"content_sha256":"6fff1a59c9a5015d4e308b9f096343f4079b4041f851da1f0c0db5eed826805c","schema_version":"1.0","event_id":"sha256:6fff1a59c9a5015d4e308b9f096343f4079b4041f851da1f0c0db5eed826805c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/UBKLBRU3V7C4WNPDRA4DLEYWWL/bundle.json","state_url":"https://pith.science/pith/UBKLBRU3V7C4WNPDRA4DLEYWWL/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/UBKLBRU3V7C4WNPDRA4DLEYWWL/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":"2026-05-26T16:26:24Z","links":{"resolver":"https://pith.science/pith/UBKLBRU3V7C4WNPDRA4DLEYWWL","bundle":"https://pith.science/pith/UBKLBRU3V7C4WNPDRA4DLEYWWL/bundle.json","state":"https://pith.science/pith/UBKLBRU3V7C4WNPDRA4DLEYWWL/state.json","well_known_bundle":"https://pith.science/.well-known/pith/UBKLBRU3V7C4WNPDRA4DLEYWWL/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:UBKLBRU3V7C4WNPDRA4DLEYWWL","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":"4b7a49802c2f435505f20f32c4c88f45c452568a9d76f60c44128f35c7ff381e","cross_cats_sorted":["astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2009-02-06T09:51:02Z","title_canon_sha256":"b5fdcdf20a0d787f195bd3f99cb12cbbc0453c1045cdedacd108f0bb1a4609fb"},"schema_version":"1.0","source":{"id":"0902.1039","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0902.1039","created_at":"2026-05-18T04:25:51Z"},{"alias_kind":"arxiv_version","alias_value":"0902.1039v1","created_at":"2026-05-18T04:25:51Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0902.1039","created_at":"2026-05-18T04:25:51Z"},{"alias_kind":"pith_short_12","alias_value":"UBKLBRU3V7C4","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_16","alias_value":"UBKLBRU3V7C4WNPD","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_8","alias_value":"UBKLBRU3","created_at":"2026-05-18T12:26:02Z"}],"graph_snapshots":[{"event_id":"sha256:6fff1a59c9a5015d4e308b9f096343f4079b4041f851da1f0c0db5eed826805c","target":"graph","created_at":"2026-05-18T04:25:51Z","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 new reduction of the astrometric data as produced by the Hipparcos mission has been published, claiming that the accuracies for nearly all stars brighter than magnitude $\\mathrm{Hp}=8$ are improved, by up to a factor 4, compared to the original catalogue. As correlations between the underlying abscissa residuals have also been reduced by more than an order of magnitude to an insignificant level, our ability to determine reliable parallaxes and proper motions for open clusters should be improved. The new Hipparcos astrometric catalogue is used to derive mean parallax and proper motion estimat","authors_text":"Floor van Leeuwen","cross_cats":["astro-ph.IM"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2009-02-06T09:51:02Z","title":"Parallaxes and proper motions for 20 open clusters as based on the new Hipparcos catalogue"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0902.1039","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":"sha256:6e71b7e854f4fbd3a0826902ac1b87eafdbf5500ff6fe09becb895a810c94529","target":"record","created_at":"2026-05-18T04:25:51Z","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":"4b7a49802c2f435505f20f32c4c88f45c452568a9d76f60c44128f35c7ff381e","cross_cats_sorted":["astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2009-02-06T09:51:02Z","title_canon_sha256":"b5fdcdf20a0d787f195bd3f99cb12cbbc0453c1045cdedacd108f0bb1a4609fb"},"schema_version":"1.0","source":{"id":"0902.1039","kind":"arxiv","version":1}},"canonical_sha256":"a054b0c69bafc5cb35e38838359316b2ca46976074960818e7da05716f89059c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a054b0c69bafc5cb35e38838359316b2ca46976074960818e7da05716f89059c","first_computed_at":"2026-05-18T04:25:51.396460Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:25:51.396460Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"xs2mScY/tHgg4ju7BHn43ORYa8CumXTFI6JGQlG5WwnElBFwdtecDMjVCWPL/yeXgxS+VOPU6SqvlRrdkDdJCg==","signature_status":"signed_v1","signed_at":"2026-05-18T04:25:51.397011Z","signed_message":"canonical_sha256_bytes"},"source_id":"0902.1039","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:6e71b7e854f4fbd3a0826902ac1b87eafdbf5500ff6fe09becb895a810c94529","sha256:6fff1a59c9a5015d4e308b9f096343f4079b4041f851da1f0c0db5eed826805c"],"state_sha256":"9d2d44333490f00413e577e65dc7917802e6922d6e9d1202c1aa64443c199d33"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"VOJmrQJfvCztIhv0YNKyT4TJdmHlkOSq/KY70QJUw5WR0neYqYRwDLBWxT+JEm+sfDuY6l7rQpBrKhbwc8AWCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T16:26:24.313446Z","bundle_sha256":"fe54fd09a0058fe2094fe3e448fcd0a36e6157297caa1f6343a9d8923f81c51e"}}