{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:J7ZWK4D42HE7E6LLLA7L5X2DLH","short_pith_number":"pith:J7ZWK4D4","canonical_record":{"source":{"id":"0903.3402","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-03-19T20:00:02Z","cross_cats_sorted":[],"title_canon_sha256":"ae25ccacf54a558a00ce9232e076522c4d25c6d2d6d33cb4c54919a43cf36b8f","abstract_canon_sha256":"37423420ab3e808850b0955f4b8fd42d0308bc2e77d6fd1abaed46563fbc3aed"},"schema_version":"1.0"},"canonical_sha256":"4ff365707cd1c9f2796b583ebedf4359d04d9103516cd5046845f064b9b9d8e9","source":{"kind":"arxiv","id":"0903.3402","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0903.3402","created_at":"2026-05-18T02:14:27Z"},{"alias_kind":"arxiv_version","alias_value":"0903.3402v2","created_at":"2026-05-18T02:14:27Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0903.3402","created_at":"2026-05-18T02:14:27Z"},{"alias_kind":"pith_short_12","alias_value":"J7ZWK4D42HE7","created_at":"2026-05-18T12:26:00Z"},{"alias_kind":"pith_short_16","alias_value":"J7ZWK4D42HE7E6LL","created_at":"2026-05-18T12:26:00Z"},{"alias_kind":"pith_short_8","alias_value":"J7ZWK4D4","created_at":"2026-05-18T12:26:00Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:J7ZWK4D42HE7E6LLLA7L5X2DLH","target":"record","payload":{"canonical_record":{"source":{"id":"0903.3402","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-03-19T20:00:02Z","cross_cats_sorted":[],"title_canon_sha256":"ae25ccacf54a558a00ce9232e076522c4d25c6d2d6d33cb4c54919a43cf36b8f","abstract_canon_sha256":"37423420ab3e808850b0955f4b8fd42d0308bc2e77d6fd1abaed46563fbc3aed"},"schema_version":"1.0"},"canonical_sha256":"4ff365707cd1c9f2796b583ebedf4359d04d9103516cd5046845f064b9b9d8e9","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:14:27.215123Z","signature_b64":"j3wpRgqX79th4nZb+1eVp/UP/ImgqQgVygTJohoURBqj6nhA9SlmwwR/jVNic+1c0OSSrj3KucVuYizCgBbQBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"4ff365707cd1c9f2796b583ebedf4359d04d9103516cd5046845f064b9b9d8e9","last_reissued_at":"2026-05-18T02:14:27.214402Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:14:27.214402Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0903.3402","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":"2026-05-18T02:14:27Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"G09WDdqQRm8IK3KM+WCtqyoqlzdxwGN9d8+CKx6FU6sidsUyE3qDjE/S1tyCFA+nPKUJmvTgLPhVoBjUJVC2DA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-07T19:11:46.611103Z"},"content_sha256":"4e8ae2465039880e41edc64722312914966030c2815c92dfcd196e80492908b2","schema_version":"1.0","event_id":"sha256:4e8ae2465039880e41edc64722312914966030c2815c92dfcd196e80492908b2"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:J7ZWK4D42HE7E6LLLA7L5X2DLH","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Future dark energy constraints from measurements of quasar parallax: Gaia, SIM and beyond","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"CMU), Fiona Ding (McWilliams Center for Cosmology, Rupert A.C. Croft (McWilliams Center for Cosmology","submitted_at":"2009-03-19T20:00:02Z","abstract_excerpt":"(Abridged) A consequence of the Earth's motion with respect to the CMB is that over a 10 year period it will travel a distance of ~800 AU. As first noted by Kardashev in 1986, this baseline can be used to carry out astrometric measurements of quasar parallaxes, so that only microarcsecond precision is necessary to detect parallax shifts of objects at gigaparsec distances. Such precision will soon be approached with the launch of the astrometric satellites Gaia and SIM. We use a Fisher matrix formalism to investigate the constraints that these and future missions may be able to place on the cos"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0903.3402","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":"2026-05-18T02:14:27Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"P0EhEcMtH1DUFVx6sKh9i5S6ln1Lhf4Rcbp171ld/3kGpP5l5di6UZQo8AMw8JRZZI4XlHHspvQ1Sc63QuvhDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-07T19:11:46.611763Z"},"content_sha256":"8c524ba57a909dbc73a4b1c9c4b0f2dfc6ca58a22d97c17b75e5376eb4fc997d","schema_version":"1.0","event_id":"sha256:8c524ba57a909dbc73a4b1c9c4b0f2dfc6ca58a22d97c17b75e5376eb4fc997d"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/J7ZWK4D42HE7E6LLLA7L5X2DLH/bundle.json","state_url":"https://pith.science/pith/J7ZWK4D42HE7E6LLLA7L5X2DLH/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/J7ZWK4D42HE7E6LLLA7L5X2DLH/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":"2026-06-07T19:11:46Z","links":{"resolver":"https://pith.science/pith/J7ZWK4D42HE7E6LLLA7L5X2DLH","bundle":"https://pith.science/pith/J7ZWK4D42HE7E6LLLA7L5X2DLH/bundle.json","state":"https://pith.science/pith/J7ZWK4D42HE7E6LLLA7L5X2DLH/state.json","well_known_bundle":"https://pith.science/.well-known/pith/J7ZWK4D42HE7E6LLLA7L5X2DLH/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:J7ZWK4D42HE7E6LLLA7L5X2DLH","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":"37423420ab3e808850b0955f4b8fd42d0308bc2e77d6fd1abaed46563fbc3aed","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-03-19T20:00:02Z","title_canon_sha256":"ae25ccacf54a558a00ce9232e076522c4d25c6d2d6d33cb4c54919a43cf36b8f"},"schema_version":"1.0","source":{"id":"0903.3402","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0903.3402","created_at":"2026-05-18T02:14:27Z"},{"alias_kind":"arxiv_version","alias_value":"0903.3402v2","created_at":"2026-05-18T02:14:27Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0903.3402","created_at":"2026-05-18T02:14:27Z"},{"alias_kind":"pith_short_12","alias_value":"J7ZWK4D42HE7","created_at":"2026-05-18T12:26:00Z"},{"alias_kind":"pith_short_16","alias_value":"J7ZWK4D42HE7E6LL","created_at":"2026-05-18T12:26:00Z"},{"alias_kind":"pith_short_8","alias_value":"J7ZWK4D4","created_at":"2026-05-18T12:26:00Z"}],"graph_snapshots":[{"event_id":"sha256:8c524ba57a909dbc73a4b1c9c4b0f2dfc6ca58a22d97c17b75e5376eb4fc997d","target":"graph","created_at":"2026-05-18T02:14:27Z","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":"(Abridged) A consequence of the Earth's motion with respect to the CMB is that over a 10 year period it will travel a distance of ~800 AU. As first noted by Kardashev in 1986, this baseline can be used to carry out astrometric measurements of quasar parallaxes, so that only microarcsecond precision is necessary to detect parallax shifts of objects at gigaparsec distances. Such precision will soon be approached with the launch of the astrometric satellites Gaia and SIM. We use a Fisher matrix formalism to investigate the constraints that these and future missions may be able to place on the cos","authors_text":"CMU), Fiona Ding (McWilliams Center for Cosmology, Rupert A.C. Croft (McWilliams Center for Cosmology","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-03-19T20:00:02Z","title":"Future dark energy constraints from measurements of quasar parallax: Gaia, SIM and beyond"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0903.3402","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":"sha256:4e8ae2465039880e41edc64722312914966030c2815c92dfcd196e80492908b2","target":"record","created_at":"2026-05-18T02:14:27Z","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":"37423420ab3e808850b0955f4b8fd42d0308bc2e77d6fd1abaed46563fbc3aed","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-03-19T20:00:02Z","title_canon_sha256":"ae25ccacf54a558a00ce9232e076522c4d25c6d2d6d33cb4c54919a43cf36b8f"},"schema_version":"1.0","source":{"id":"0903.3402","kind":"arxiv","version":2}},"canonical_sha256":"4ff365707cd1c9f2796b583ebedf4359d04d9103516cd5046845f064b9b9d8e9","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"4ff365707cd1c9f2796b583ebedf4359d04d9103516cd5046845f064b9b9d8e9","first_computed_at":"2026-05-18T02:14:27.214402Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:14:27.214402Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"j3wpRgqX79th4nZb+1eVp/UP/ImgqQgVygTJohoURBqj6nhA9SlmwwR/jVNic+1c0OSSrj3KucVuYizCgBbQBg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:14:27.215123Z","signed_message":"canonical_sha256_bytes"},"source_id":"0903.3402","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4e8ae2465039880e41edc64722312914966030c2815c92dfcd196e80492908b2","sha256:8c524ba57a909dbc73a4b1c9c4b0f2dfc6ca58a22d97c17b75e5376eb4fc997d"],"state_sha256":"17109b1488eb1052b17482f8742f07ac55388b343922d921e9542f6221c9159c"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Uh/6XYCN/zb5iSPc1L9mJeyta8L+4zPIeWB1WDC//Zid4CP+zCFo5sZN0zCQQH6wAmgF2CHjNbjMRk5V9TuyAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-07T19:11:46.615449Z","bundle_sha256":"0b63a0d0d1ba7f54f103232869b3c917fbed7d52aed81d79a567675137da4556"}}