{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:DPQW6JCGLTCR5XMVONGMHB6ZFE","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":"5dfe6579a0220910c632ee7d5a3c80a9489ca37f98414fa965df21d721382edc","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-01-28T16:31:27Z","title_canon_sha256":"a76a707310a3ae580f3651d13f779fe2043025ff08f3e180cd412807eb92b17c"},"schema_version":"1.0","source":{"id":"1601.07819","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1601.07819","created_at":"2026-05-18T01:18:37Z"},{"alias_kind":"arxiv_version","alias_value":"1601.07819v2","created_at":"2026-05-18T01:18:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1601.07819","created_at":"2026-05-18T01:18:37Z"},{"alias_kind":"pith_short_12","alias_value":"DPQW6JCGLTCR","created_at":"2026-05-18T12:30:12Z"},{"alias_kind":"pith_short_16","alias_value":"DPQW6JCGLTCR5XMV","created_at":"2026-05-18T12:30:12Z"},{"alias_kind":"pith_short_8","alias_value":"DPQW6JCG","created_at":"2026-05-18T12:30:12Z"}],"graph_snapshots":[{"event_id":"sha256:fe46b80cb6e207ffbb5787cf5b4349e6b3087c0053bbeed72a7f99f8b831575d","target":"graph","created_at":"2026-05-18T01:18:37Z","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":"Laser Guide Stars (LGS) have greatly increased the sky-coverage of Adaptive Optics (AO) systems. Due to the up-link turbulence experienced by LGSs, a Natural Guide Star (NGS) is still required, preventing full sky-coverage. We present a method of obtaining partial tip-tilt information from LGSs alone in multi-LGS tomographic LGS AO systems. The method of LGS up-link tip-tilt determination is derived using a geometric approach, then an alteration to the Learn and Apply algorithm for tomographic AO is made to accommodate up-link tip-tilt. Simulation results are presented, verifying that the tech","authors_text":"A. P. Reeves, J. Osborn, N. A. Bharmal, R. M. Myers, T. J. Morris","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-01-28T16:31:27Z","title":"A tomographic algorithm to determine tip-tilt information from laser guide stars"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1601.07819","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:ecee6bd38a79f806df2af757fe038e72b2237b69b60ede42af84fbaba43b088d","target":"record","created_at":"2026-05-18T01:18:37Z","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":"5dfe6579a0220910c632ee7d5a3c80a9489ca37f98414fa965df21d721382edc","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-01-28T16:31:27Z","title_canon_sha256":"a76a707310a3ae580f3651d13f779fe2043025ff08f3e180cd412807eb92b17c"},"schema_version":"1.0","source":{"id":"1601.07819","kind":"arxiv","version":2}},"canonical_sha256":"1be16f24465cc51edd95734cc387d92932483693d16a561a4aafcff9c43e99c4","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"1be16f24465cc51edd95734cc387d92932483693d16a561a4aafcff9c43e99c4","first_computed_at":"2026-05-18T01:18:37.814810Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:18:37.814810Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"zbmzE63oAZLbOsZIj1EdXsJiFGGj1XzDRAADZfkwNMrKzNj9MJaCpdyA1pEjMmTN7j/78XcktjvegAfYzkVWAA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:18:37.815455Z","signed_message":"canonical_sha256_bytes"},"source_id":"1601.07819","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ecee6bd38a79f806df2af757fe038e72b2237b69b60ede42af84fbaba43b088d","sha256:fe46b80cb6e207ffbb5787cf5b4349e6b3087c0053bbeed72a7f99f8b831575d"],"state_sha256":"324c9a63b5786bce30e4e4bd605529b0b47e9762946c420c64b829d3e2de9b23"}