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For each nebula, we identify a candidate central star, the parallaxes of which lead to nebular age estimates in the range 50-100 thousand years.","weakest_assumption":"The assumption that the identified objects are genuine planetary nebulae and that the candidate central stars are correctly associated with them, so that Gaia parallaxes can be used to derive reliable distances and thus nebular ages."}},"verdict_id":"e61d88e8-cfad-4f43-b616-8da0a0da2d10"}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:b2fe6de4bdabf31533373ad948f10d252eff65375dc127e6f6ed870aef5d2490","target":"record","created_at":"2026-06-03T14:05:24Z","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":"f3e4eb8ca91282998c31316e6342d310bfb546eedbe681cdb2e96efd134d6c41","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2026-04-22T07:28:02Z","title_canon_sha256":"8a862a50feb7eae1ffc9d4b2f2d57237f7e8d9f85c94842c21db3fc0c3880f12"},"schema_version":"1.0","source":{"id":"2604.20280","kind":"arxiv","version":2}},"canonical_sha256":"c4664c6f861bde92878d877f4e5e214deb9afd976c9120ea6e1fdff43ee82414","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c4664c6f861bde92878d877f4e5e214deb9afd976c9120ea6e1fdff43ee82414","first_computed_at":"2026-06-03T14:05:24.971940Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-06-03T14:05:24.971940Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"kHCqv2z7fso9iH3fLWDAHfUf+XJamuVF3pH6vv7GfLrunZ6BheJdzfAGg9weun0dVDkWKCJ5KJrR99zGipg2Bg==","signature_status":"signed_v1","signed_at":"2026-06-03T14:05:24.972379Z","signed_message":"canonical_sha256_bytes"},"source_id":"2604.20280","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b2fe6de4bdabf31533373ad948f10d252eff65375dc127e6f6ed870aef5d2490","sha256:b2d4c4620932ef5e8bdc004efba1c148e72501119880b107893d4587c4200763"],"state_sha256":"2974ef08476a1a23ddd4b024b503182f374d6f5c62f41eecc36a9bac8b10bf1a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3/9l9volpSwCnawKGG9GFZX5DJD/zsmXamyQhWnADDBWUN73d8lHK/5rWn01a3Hlg1qZq1pVJorepCLX1YZcCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-29T18:18:23.001306Z","bundle_sha256":"39f7c8e333e3a76fb9a9c496e00ddaed6311206722df0a72fb5e316bcf6bb316"}}