{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:OHPJTW6AHENHXEIMK75YG4MN2G","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":"8c052a2ce489b3262f0569002223fad309e4c61d2f09cc8d166344b921aacbd7","cross_cats_sorted":["astro-ph.IM","gr-qc","physics.optics"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2016-04-21T15:08:12Z","title_canon_sha256":"dddea14195026cdc9ec673d50e4a87e98bba2a05ece56f7da1dd770863b19f88"},"schema_version":"1.0","source":{"id":"1604.06351","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1604.06351","created_at":"2026-05-18T00:55:00Z"},{"alias_kind":"arxiv_version","alias_value":"1604.06351v2","created_at":"2026-05-18T00:55:00Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1604.06351","created_at":"2026-05-18T00:55:00Z"},{"alias_kind":"pith_short_12","alias_value":"OHPJTW6AHENH","created_at":"2026-05-18T12:30:36Z"},{"alias_kind":"pith_short_16","alias_value":"OHPJTW6AHENHXEIM","created_at":"2026-05-18T12:30:36Z"},{"alias_kind":"pith_short_8","alias_value":"OHPJTW6A","created_at":"2026-05-18T12:30:36Z"}],"graph_snapshots":[{"event_id":"sha256:22a867a26fcb9d56ee6b26ddb6a78c8e6a64878f6879ddc9697e9247d62e16ef","target":"graph","created_at":"2026-05-18T00:55:00Z","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":"The gravitational field of the sun will focus light from a distant source to a focal point at a minimal distance of 550 Astronomical Units from the sun. A proposed mission to this gravitational focus could use the sun as a very large lens, allowing (in principle) a large amplification of signal from the target, and a very high magnification. This article discusses some of the difficulties involved in using the sun as such a gravitational telescope for a candidate mission, that of imaging the surface of a previously-detected exoplanet. These difficulties include the pointing and focal length, a","authors_text":"Geoffrey A. Landis","cross_cats":["astro-ph.IM","gr-qc","physics.optics"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2016-04-21T15:08:12Z","title":"Mission to the Gravitational Focus of the Sun: A Critical Analysis"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1604.06351","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":"sha256:3fea852b8aae94d9a0e08b2e37f1545b5a79708def28edeb12d532b703dc77a8","target":"record","created_at":"2026-05-18T00:55:00Z","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":"8c052a2ce489b3262f0569002223fad309e4c61d2f09cc8d166344b921aacbd7","cross_cats_sorted":["astro-ph.IM","gr-qc","physics.optics"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2016-04-21T15:08:12Z","title_canon_sha256":"dddea14195026cdc9ec673d50e4a87e98bba2a05ece56f7da1dd770863b19f88"},"schema_version":"1.0","source":{"id":"1604.06351","kind":"arxiv","version":2}},"canonical_sha256":"71de99dbc0391a7b910c57fb83718dd18385ea510f89f57887b2bd6eda84266d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"71de99dbc0391a7b910c57fb83718dd18385ea510f89f57887b2bd6eda84266d","first_computed_at":"2026-05-18T00:55:00.264828Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:55:00.264828Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"DoUrWzDEoUHeiEzubZ7NwJklsFSYqJAoLD/SK3gU/J2TTToE9NxD3qC2uc3gyf8T3jjBw94PRiV2nygvm5LQBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:55:00.265528Z","signed_message":"canonical_sha256_bytes"},"source_id":"1604.06351","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3fea852b8aae94d9a0e08b2e37f1545b5a79708def28edeb12d532b703dc77a8","sha256:22a867a26fcb9d56ee6b26ddb6a78c8e6a64878f6879ddc9697e9247d62e16ef"],"state_sha256":"9e018fb05abd23f34c0f7b2a0aab89129f60a6750210949de33e1fbb39b4153d"}