{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2018:D7NFBLNM2ONFV3ZNFN3UUUJLCD","short_pith_number":"pith:D7NFBLNM","schema_version":"1.0","canonical_sha256":"1fda50adacd39a5aef2d2b774a512b10e80d457cf590726ec7a3bc184f4aedaa","source":{"kind":"arxiv","id":"1807.02115","version":3},"attestation_state":"computed","paper":{"title":"Kinematics in Young Star Clusters and Associations with Gaia DR2","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.SR"],"primary_cat":"astro-ph.GA","authors_text":"(2) McMaster University, (3) Pennsylvania State University), Alison Sills (2), Eric D. Feigelson (3), Konstantin V. Getman (3) ((1) California Institute of Technology, Lynne A. Hillenbrand (1), Michael A. Kuhn (1)","submitted_at":"2018-07-05T18:00:00Z","abstract_excerpt":"The Gaia mission has opened a new window into the internal kinematics of young star clusters at the sub-km/s level, with implications for our understanding of how star clusters form and evolve. We use a sample of 28 clusters and associations with ages from 1-5 Myr, where lists of members are available from previous X-ray, optical, and infrared studies. Proper motions from Gaia DR2 reveals that at least 75% of these systems are expanding; however, rotation is only detected in one system. Typical expansion velocities are on the order of ~0.5 km/s, and, in several systems, there is a positive rad"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1807.02115","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-07-05T18:00:00Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"ad2281d7372968cfbcbfc69bc6c14dc5bac860456c82c2384746460a01d53144","abstract_canon_sha256":"1a3415bfb4283ca3f69bc6e444afeb598080e8c2fde2a822ae7137889e31e4eb"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:56:47.710372Z","signature_b64":"glYafhV2aYokZUg+s/hFekomTONjdWV2HusKpEdKvyel2rfg+9EvkrCHtkOombNJ5o6j6jbwSK4Cupp+iOLmCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"1fda50adacd39a5aef2d2b774a512b10e80d457cf590726ec7a3bc184f4aedaa","last_reissued_at":"2026-05-17T23:56:47.709969Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:56:47.709969Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Kinematics in Young Star Clusters and Associations with Gaia DR2","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.SR"],"primary_cat":"astro-ph.GA","authors_text":"(2) McMaster University, (3) Pennsylvania State University), Alison Sills (2), Eric D. Feigelson (3), Konstantin V. Getman (3) ((1) California Institute of Technology, Lynne A. Hillenbrand (1), Michael A. Kuhn (1)","submitted_at":"2018-07-05T18:00:00Z","abstract_excerpt":"The Gaia mission has opened a new window into the internal kinematics of young star clusters at the sub-km/s level, with implications for our understanding of how star clusters form and evolve. We use a sample of 28 clusters and associations with ages from 1-5 Myr, where lists of members are available from previous X-ray, optical, and infrared studies. Proper motions from Gaia DR2 reveals that at least 75% of these systems are expanding; however, rotation is only detected in one system. Typical expansion velocities are on the order of ~0.5 km/s, and, in several systems, there is a positive rad"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1807.02115","kind":"arxiv","version":3},"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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1807.02115","created_at":"2026-05-17T23:56:47.710027+00:00"},{"alias_kind":"arxiv_version","alias_value":"1807.02115v3","created_at":"2026-05-17T23:56:47.710027+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1807.02115","created_at":"2026-05-17T23:56:47.710027+00:00"},{"alias_kind":"pith_short_12","alias_value":"D7NFBLNM2ONF","created_at":"2026-05-18T12:32:19.392346+00:00"},{"alias_kind":"pith_short_16","alias_value":"D7NFBLNM2ONFV3ZN","created_at":"2026-05-18T12:32:19.392346+00:00"},{"alias_kind":"pith_short_8","alias_value":"D7NFBLNM","created_at":"2026-05-18T12:32:19.392346+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/D7NFBLNM2ONFV3ZNFN3UUUJLCD","json":"https://pith.science/pith/D7NFBLNM2ONFV3ZNFN3UUUJLCD.json","graph_json":"https://pith.science/api/pith-number/D7NFBLNM2ONFV3ZNFN3UUUJLCD/graph.json","events_json":"https://pith.science/api/pith-number/D7NFBLNM2ONFV3ZNFN3UUUJLCD/events.json","paper":"https://pith.science/paper/D7NFBLNM"},"agent_actions":{"view_html":"https://pith.science/pith/D7NFBLNM2ONFV3ZNFN3UUUJLCD","download_json":"https://pith.science/pith/D7NFBLNM2ONFV3ZNFN3UUUJLCD.json","view_paper":"https://pith.science/paper/D7NFBLNM","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1807.02115&json=true","fetch_graph":"https://pith.science/api/pith-number/D7NFBLNM2ONFV3ZNFN3UUUJLCD/graph.json","fetch_events":"https://pith.science/api/pith-number/D7NFBLNM2ONFV3ZNFN3UUUJLCD/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/D7NFBLNM2ONFV3ZNFN3UUUJLCD/action/timestamp_anchor","attest_storage":"https://pith.science/pith/D7NFBLNM2ONFV3ZNFN3UUUJLCD/action/storage_attestation","attest_author":"https://pith.science/pith/D7NFBLNM2ONFV3ZNFN3UUUJLCD/action/author_attestation","sign_citation":"https://pith.science/pith/D7NFBLNM2ONFV3ZNFN3UUUJLCD/action/citation_signature","submit_replication":"https://pith.science/pith/D7NFBLNM2ONFV3ZNFN3UUUJLCD/action/replication_record"}},"created_at":"2026-05-17T23:56:47.710027+00:00","updated_at":"2026-05-17T23:56:47.710027+00:00"}