{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:QBI2NH4JR2OCLAD5WN6O4TFRNJ","short_pith_number":"pith:QBI2NH4J","canonical_record":{"source":{"id":"1810.07328","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2018-10-17T00:28:56Z","cross_cats_sorted":[],"title_canon_sha256":"d4e7fc782615dab61786938e8d0c8b7c4dc590b58a9b2c32a907f605566cb839","abstract_canon_sha256":"c9c3e19e122e0daf7a43fa74807c60c48cc5fb90c7b4e4c990d0063f142be501"},"schema_version":"1.0"},"canonical_sha256":"8051a69f898e9c25807db37cee4cb16a646d9367e0227fd43fd4a6192dd934ba","source":{"kind":"arxiv","id":"1810.07328","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1810.07328","created_at":"2026-05-17T23:59:48Z"},{"alias_kind":"arxiv_version","alias_value":"1810.07328v2","created_at":"2026-05-17T23:59:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1810.07328","created_at":"2026-05-17T23:59:48Z"},{"alias_kind":"pith_short_12","alias_value":"QBI2NH4JR2OC","created_at":"2026-05-18T12:32:46Z"},{"alias_kind":"pith_short_16","alias_value":"QBI2NH4JR2OCLAD5","created_at":"2026-05-18T12:32:46Z"},{"alias_kind":"pith_short_8","alias_value":"QBI2NH4J","created_at":"2026-05-18T12:32:46Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:QBI2NH4JR2OCLAD5WN6O4TFRNJ","target":"record","payload":{"canonical_record":{"source":{"id":"1810.07328","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2018-10-17T00:28:56Z","cross_cats_sorted":[],"title_canon_sha256":"d4e7fc782615dab61786938e8d0c8b7c4dc590b58a9b2c32a907f605566cb839","abstract_canon_sha256":"c9c3e19e122e0daf7a43fa74807c60c48cc5fb90c7b4e4c990d0063f142be501"},"schema_version":"1.0"},"canonical_sha256":"8051a69f898e9c25807db37cee4cb16a646d9367e0227fd43fd4a6192dd934ba","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:59:48.981538Z","signature_b64":"O1LTvk1r3IPLuUx5cxjHirSx8j+bUwOqMHi1ZyUFva71XbH5NyH9h0O9hgb6SlvVeCimGK1JmAnWqU1WnGDaCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"8051a69f898e9c25807db37cee4cb16a646d9367e0227fd43fd4a6192dd934ba","last_reissued_at":"2026-05-17T23:59:48.980942Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:59:48.980942Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1810.07328","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":"2026-05-17T23:59:48Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8jBQBJE++1mzwT5Nb58F1ZW64dkB/j3ggxL1iUD1bwBGyNkto9Y7MX/ekyBIB0j0AWqGXkm7jtJb2J3ep4euCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T21:22:24.067840Z"},"content_sha256":"1fdab19b33563d22ef1d5f97cef7466aca7cebc4494eddd2692690774e6a3172","schema_version":"1.0","event_id":"sha256:1fdab19b33563d22ef1d5f97cef7466aca7cebc4494eddd2692690774e6a3172"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:QBI2NH4JR2OCLAD5WN6O4TFRNJ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Maximum Angular Separation Epochs for Exoplanet Imaging Observations","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.EP","authors_text":"Margaret C. Turnbull, Stephen R. Kane, Tiffany Meshkat","submitted_at":"2018-10-17T00:28:56Z","abstract_excerpt":"Direct imaging of exoplanets presents both significant challenges and significant gains. The advantages primarily lie in receiving emitted and, with future instruments, reflected photons at phase angles not accessible by other techniques, enabling the potential for atmospheric studies and the detection of rotation and surface features. The challenges are numerous and include coronagraph development and achieving the necessary contrast ratio. Here, we address the specific challenge of determining epochs of maximum angular separation for the star and planet. We compute orbital ephemerides for kn"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1810.07328","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":"2026-05-17T23:59:48Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"0qxbms1iirXxtpwxhTlYvZhK95oD3Iu1gkejlRTxGSC2zpBGKyAbaK/UdUcVugzPSFy1kcyk/Omqx7OKdwxhCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T21:22:24.068363Z"},"content_sha256":"0109a5dc4f1bf37eed9167bd651ba1031a46bf615b65cfc7e46d79a8c9377806","schema_version":"1.0","event_id":"sha256:0109a5dc4f1bf37eed9167bd651ba1031a46bf615b65cfc7e46d79a8c9377806"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/QBI2NH4JR2OCLAD5WN6O4TFRNJ/bundle.json","state_url":"https://pith.science/pith/QBI2NH4JR2OCLAD5WN6O4TFRNJ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/QBI2NH4JR2OCLAD5WN6O4TFRNJ/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":"2026-05-31T21:22:24Z","links":{"resolver":"https://pith.science/pith/QBI2NH4JR2OCLAD5WN6O4TFRNJ","bundle":"https://pith.science/pith/QBI2NH4JR2OCLAD5WN6O4TFRNJ/bundle.json","state":"https://pith.science/pith/QBI2NH4JR2OCLAD5WN6O4TFRNJ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/QBI2NH4JR2OCLAD5WN6O4TFRNJ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:QBI2NH4JR2OCLAD5WN6O4TFRNJ","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":"c9c3e19e122e0daf7a43fa74807c60c48cc5fb90c7b4e4c990d0063f142be501","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2018-10-17T00:28:56Z","title_canon_sha256":"d4e7fc782615dab61786938e8d0c8b7c4dc590b58a9b2c32a907f605566cb839"},"schema_version":"1.0","source":{"id":"1810.07328","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1810.07328","created_at":"2026-05-17T23:59:48Z"},{"alias_kind":"arxiv_version","alias_value":"1810.07328v2","created_at":"2026-05-17T23:59:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1810.07328","created_at":"2026-05-17T23:59:48Z"},{"alias_kind":"pith_short_12","alias_value":"QBI2NH4JR2OC","created_at":"2026-05-18T12:32:46Z"},{"alias_kind":"pith_short_16","alias_value":"QBI2NH4JR2OCLAD5","created_at":"2026-05-18T12:32:46Z"},{"alias_kind":"pith_short_8","alias_value":"QBI2NH4J","created_at":"2026-05-18T12:32:46Z"}],"graph_snapshots":[{"event_id":"sha256:0109a5dc4f1bf37eed9167bd651ba1031a46bf615b65cfc7e46d79a8c9377806","target":"graph","created_at":"2026-05-17T23:59:48Z","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":"Direct imaging of exoplanets presents both significant challenges and significant gains. The advantages primarily lie in receiving emitted and, with future instruments, reflected photons at phase angles not accessible by other techniques, enabling the potential for atmospheric studies and the detection of rotation and surface features. The challenges are numerous and include coronagraph development and achieving the necessary contrast ratio. Here, we address the specific challenge of determining epochs of maximum angular separation for the star and planet. We compute orbital ephemerides for kn","authors_text":"Margaret C. Turnbull, Stephen R. Kane, Tiffany Meshkat","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2018-10-17T00:28:56Z","title":"Maximum Angular Separation Epochs for Exoplanet Imaging Observations"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1810.07328","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":"sha256:1fdab19b33563d22ef1d5f97cef7466aca7cebc4494eddd2692690774e6a3172","target":"record","created_at":"2026-05-17T23:59:48Z","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":"c9c3e19e122e0daf7a43fa74807c60c48cc5fb90c7b4e4c990d0063f142be501","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2018-10-17T00:28:56Z","title_canon_sha256":"d4e7fc782615dab61786938e8d0c8b7c4dc590b58a9b2c32a907f605566cb839"},"schema_version":"1.0","source":{"id":"1810.07328","kind":"arxiv","version":2}},"canonical_sha256":"8051a69f898e9c25807db37cee4cb16a646d9367e0227fd43fd4a6192dd934ba","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"8051a69f898e9c25807db37cee4cb16a646d9367e0227fd43fd4a6192dd934ba","first_computed_at":"2026-05-17T23:59:48.980942Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:59:48.980942Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"O1LTvk1r3IPLuUx5cxjHirSx8j+bUwOqMHi1ZyUFva71XbH5NyH9h0O9hgb6SlvVeCimGK1JmAnWqU1WnGDaCg==","signature_status":"signed_v1","signed_at":"2026-05-17T23:59:48.981538Z","signed_message":"canonical_sha256_bytes"},"source_id":"1810.07328","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1fdab19b33563d22ef1d5f97cef7466aca7cebc4494eddd2692690774e6a3172","sha256:0109a5dc4f1bf37eed9167bd651ba1031a46bf615b65cfc7e46d79a8c9377806"],"state_sha256":"a1b57a14183123418811de3eab029b2ef2e6b75f565bf7e2d62d4df016c42d64"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"4LF+SSnaBOpLsUxQ2IdWR2bJQKVXVwrE2PpguHjAuSPRRRov6ONo7XgWQrekuwQhUG82+XQTC5v8XfjuivFSBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T21:22:24.071616Z","bundle_sha256":"9b813f7a8da55316503d9f73d3ed692292d0d8a6cc1d92096b9242d843e0776c"}}