{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:2MOCNUDYOXXTIZ54AMFNCSWDFS","short_pith_number":"pith:2MOCNUDY","canonical_record":{"source":{"id":"2504.21301","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2025-04-30T04:23:10Z","cross_cats_sorted":[],"title_canon_sha256":"d515d20b0adf15d08dc554f10352dc06dcdef48a7ef84961821f9fbaa2aa1462","abstract_canon_sha256":"34f00eae24da1d3187bae5599e933411f9272a5d625467b0114ae5c112ddee6a"},"schema_version":"1.0"},"canonical_sha256":"d31c26d07875ef3467bc030ad14ac32c83a47bb5b767903d60263b97ee0ac8a2","source":{"kind":"arxiv","id":"2504.21301","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2504.21301","created_at":"2026-07-05T10:56:39Z"},{"alias_kind":"arxiv_version","alias_value":"2504.21301v2","created_at":"2026-07-05T10:56:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2504.21301","created_at":"2026-07-05T10:56:39Z"},{"alias_kind":"pith_short_12","alias_value":"2MOCNUDYOXXT","created_at":"2026-07-05T10:56:39Z"},{"alias_kind":"pith_short_16","alias_value":"2MOCNUDYOXXTIZ54","created_at":"2026-07-05T10:56:39Z"},{"alias_kind":"pith_short_8","alias_value":"2MOCNUDY","created_at":"2026-07-05T10:56:39Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:2MOCNUDYOXXTIZ54AMFNCSWDFS","target":"record","payload":{"canonical_record":{"source":{"id":"2504.21301","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2025-04-30T04:23:10Z","cross_cats_sorted":[],"title_canon_sha256":"d515d20b0adf15d08dc554f10352dc06dcdef48a7ef84961821f9fbaa2aa1462","abstract_canon_sha256":"34f00eae24da1d3187bae5599e933411f9272a5d625467b0114ae5c112ddee6a"},"schema_version":"1.0"},"canonical_sha256":"d31c26d07875ef3467bc030ad14ac32c83a47bb5b767903d60263b97ee0ac8a2","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T10:56:39.967301Z","signature_b64":"3iRp1KinESGmgBVrtH9Epyd6I5jks+8/5sCqHceBAXpQA95viqRibATVUSTygqQtnlzu+sMVi7gQMmNvOQZvCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d31c26d07875ef3467bc030ad14ac32c83a47bb5b767903d60263b97ee0ac8a2","last_reissued_at":"2026-07-05T10:56:39.966854Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T10:56:39.966854Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2504.21301","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":"2026-07-05T10:56:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fg9Fl9+O5WN2Q7jRmjjmqWeDGT0q7ZDgBLYmLVWOCjXcm3Ashhkfi4ciIuEIcm1yLwLV7WSsYvH0WgILXa66Ag==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-08T02:13:58.210901Z"},"content_sha256":"79fe2d62cfc2c8e145108c1b99485146fc7a04475729575c488101fb2ff716bc","schema_version":"1.0","event_id":"sha256:79fe2d62cfc2c8e145108c1b99485146fc7a04475729575c488101fb2ff716bc"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:2MOCNUDYOXXTIZ54AMFNCSWDFS","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Reevaluating UMa3/U1: star cluster or the smallest known galaxy?","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Holger Baumgardt, Sarah M. Sweet, Scot Devlin","submitted_at":"2025-04-30T04:23:10Z","abstract_excerpt":"Ursa Major III/UNIONS 1 (UMa3/U1) is the faintest Milky Way satellite discovered to date, exhibiting a half-light radius of 3 $\\pm$ 1 pc and an absolute V-band magnitude of +2.2 $\\pm$ 0.4. Previous studies suggest UMa3/U1 is a dwarf galaxy, based on its large internal velocity dispersion and the improbability (indicated by dynamical cluster simulations) of its long-term survival if it were a dark-matter-free star cluster. In this paper, we model the evolution of UMa3/U1 as a star cluster using collisional N-body simulations that include a description of stellar evolution and the external tidal"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2504.21301","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2504.21301/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T10:56:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5mqlTjqClJxaob0mlNNXbENm90BogH7teDEGEK+zPBREc3eAiBsbXP5ntP9p53DLp1W/eqm4bmLzUsp7pNy/Cg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-08T02:13:58.211820Z"},"content_sha256":"eaa69db3f05b31c799cdae7f859837c8925b7de6229afda081528820e4cf03b0","schema_version":"1.0","event_id":"sha256:eaa69db3f05b31c799cdae7f859837c8925b7de6229afda081528820e4cf03b0"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/2MOCNUDYOXXTIZ54AMFNCSWDFS/bundle.json","state_url":"https://pith.science/pith/2MOCNUDYOXXTIZ54AMFNCSWDFS/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/2MOCNUDYOXXTIZ54AMFNCSWDFS/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":"2026-08-08T02:13:58Z","links":{"resolver":"https://pith.science/pith/2MOCNUDYOXXTIZ54AMFNCSWDFS","bundle":"https://pith.science/pith/2MOCNUDYOXXTIZ54AMFNCSWDFS/bundle.json","state":"https://pith.science/pith/2MOCNUDYOXXTIZ54AMFNCSWDFS/state.json","well_known_bundle":"https://pith.science/.well-known/pith/2MOCNUDYOXXTIZ54AMFNCSWDFS/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:2MOCNUDYOXXTIZ54AMFNCSWDFS","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":"34f00eae24da1d3187bae5599e933411f9272a5d625467b0114ae5c112ddee6a","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2025-04-30T04:23:10Z","title_canon_sha256":"d515d20b0adf15d08dc554f10352dc06dcdef48a7ef84961821f9fbaa2aa1462"},"schema_version":"1.0","source":{"id":"2504.21301","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2504.21301","created_at":"2026-07-05T10:56:39Z"},{"alias_kind":"arxiv_version","alias_value":"2504.21301v2","created_at":"2026-07-05T10:56:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2504.21301","created_at":"2026-07-05T10:56:39Z"},{"alias_kind":"pith_short_12","alias_value":"2MOCNUDYOXXT","created_at":"2026-07-05T10:56:39Z"},{"alias_kind":"pith_short_16","alias_value":"2MOCNUDYOXXTIZ54","created_at":"2026-07-05T10:56:39Z"},{"alias_kind":"pith_short_8","alias_value":"2MOCNUDY","created_at":"2026-07-05T10:56:39Z"}],"graph_snapshots":[{"event_id":"sha256:eaa69db3f05b31c799cdae7f859837c8925b7de6229afda081528820e4cf03b0","target":"graph","created_at":"2026-07-05T10:56:39Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2504.21301/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Ursa Major III/UNIONS 1 (UMa3/U1) is the faintest Milky Way satellite discovered to date, exhibiting a half-light radius of 3 $\\pm$ 1 pc and an absolute V-band magnitude of +2.2 $\\pm$ 0.4. Previous studies suggest UMa3/U1 is a dwarf galaxy, based on its large internal velocity dispersion and the improbability (indicated by dynamical cluster simulations) of its long-term survival if it were a dark-matter-free star cluster. In this paper, we model the evolution of UMa3/U1 as a star cluster using collisional N-body simulations that include a description of stellar evolution and the external tidal","authors_text":"Holger Baumgardt, Sarah M. Sweet, Scot Devlin","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2025-04-30T04:23:10Z","title":"Reevaluating UMa3/U1: star cluster or the smallest known galaxy?"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2504.21301","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":"sha256:79fe2d62cfc2c8e145108c1b99485146fc7a04475729575c488101fb2ff716bc","target":"record","created_at":"2026-07-05T10:56:39Z","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":"34f00eae24da1d3187bae5599e933411f9272a5d625467b0114ae5c112ddee6a","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2025-04-30T04:23:10Z","title_canon_sha256":"d515d20b0adf15d08dc554f10352dc06dcdef48a7ef84961821f9fbaa2aa1462"},"schema_version":"1.0","source":{"id":"2504.21301","kind":"arxiv","version":2}},"canonical_sha256":"d31c26d07875ef3467bc030ad14ac32c83a47bb5b767903d60263b97ee0ac8a2","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d31c26d07875ef3467bc030ad14ac32c83a47bb5b767903d60263b97ee0ac8a2","first_computed_at":"2026-07-05T10:56:39.966854Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T10:56:39.966854Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"3iRp1KinESGmgBVrtH9Epyd6I5jks+8/5sCqHceBAXpQA95viqRibATVUSTygqQtnlzu+sMVi7gQMmNvOQZvCQ==","signature_status":"signed_v1","signed_at":"2026-07-05T10:56:39.967301Z","signed_message":"canonical_sha256_bytes"},"source_id":"2504.21301","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:79fe2d62cfc2c8e145108c1b99485146fc7a04475729575c488101fb2ff716bc","sha256:eaa69db3f05b31c799cdae7f859837c8925b7de6229afda081528820e4cf03b0"],"state_sha256":"2702badd7346690d83dbb12225f35c334c3e58b399f01f03cd9b12f5c33d4eb6"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"EsGhhyODtFGBwHs2u72lrwi7kpIDxfNAvmhYOFp40syYqxBm/jEhJbcu6zLJbQbocM/k2eEpHOctWXNn6nQCAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-08T02:13:58.217210Z","bundle_sha256":"d516ea10437886f41aa9dedd08e5f4c68e3aa432ba0c537aadeb0a35d1a44355"}}