{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:ZP2H3GXQZQ5EQHNDFLN3QFUTPJ","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":"bd48d2880e1614d09b73a8e112da280395d13e803b1a7915f4a8e37b31c9f3e2","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2010-03-17T20:00:02Z","title_canon_sha256":"321a58e563fc19955708c300db239261a7c62cbffd7e98bd1c99ecd05813b3d3"},"schema_version":"1.0","source":{"id":"1003.3444","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1003.3444","created_at":"2026-05-18T02:08:26Z"},{"alias_kind":"arxiv_version","alias_value":"1003.3444v1","created_at":"2026-05-18T02:08:26Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1003.3444","created_at":"2026-05-18T02:08:26Z"},{"alias_kind":"pith_short_12","alias_value":"ZP2H3GXQZQ5E","created_at":"2026-05-18T12:26:18Z"},{"alias_kind":"pith_short_16","alias_value":"ZP2H3GXQZQ5EQHND","created_at":"2026-05-18T12:26:18Z"},{"alias_kind":"pith_short_8","alias_value":"ZP2H3GXQ","created_at":"2026-05-18T12:26:18Z"}],"graph_snapshots":[{"event_id":"sha256:04f9e91ee5229da2ad5dbd68dc66f673de1a4297dc2900e73877fb4b4ecedcbb","target":"graph","created_at":"2026-05-18T02:08:26Z","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":"We report the discovery of HD 156668b, an extrasolar planet with a minimum mass of M_P sin i = 4.15 M_Earth. This planet was discovered through Keplerian modeling of precise radial velocities from Keck-HIRES and is the second super-Earth to emerge from the NASA-UC Eta-Earth Survey.  The best-fit orbit is consistent with circular and has a period of P = 4.6455 d.  The Doppler semi-amplitude of this planet, K = 1.89 m/s, is among the lowest ever detected, on par with the detection of GJ 581e using HARPS. A longer period (P ~ 2.3 yr), low-amplitude signal of unknown origin was also detected in th","authors_text":"Andrew W. Howard, Debra A. Fischer, Geoffrey W. Marcy, Gregory W. Henry, Howard Isaacson, Jason T. Wright, Jay Anderson, Jeff A. Valenti, John Asher Johnson, Nikolai E. Piskunov","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2010-03-17T20:00:02Z","title":"The NASA-UC Eta-Earth Program: II. A Planet Orbiting HD 156668 with a Minimum Mass of Four Earth Masses"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1003.3444","kind":"arxiv","version":1},"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":"sha256:9670066357c59db28cf80b473c9e0c880fa2e1a5547a4ee6ea400a5b4cc0f586","target":"record","created_at":"2026-05-18T02:08:26Z","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":"bd48d2880e1614d09b73a8e112da280395d13e803b1a7915f4a8e37b31c9f3e2","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2010-03-17T20:00:02Z","title_canon_sha256":"321a58e563fc19955708c300db239261a7c62cbffd7e98bd1c99ecd05813b3d3"},"schema_version":"1.0","source":{"id":"1003.3444","kind":"arxiv","version":1}},"canonical_sha256":"cbf47d9af0cc3a481da32adbb816937a624fdc47bbf66a9ea4274321aa1a5d2f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"cbf47d9af0cc3a481da32adbb816937a624fdc47bbf66a9ea4274321aa1a5d2f","first_computed_at":"2026-05-18T02:08:26.319886Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:08:26.319886Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"T4c2tPQf2uNxBSBRDY+la3YV3aushVhkBNBt+yYeBlAmERtybxe5b/gDz9a02LuFoZVoWohNi0Ro+xVlP3PPAg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:08:26.320535Z","signed_message":"canonical_sha256_bytes"},"source_id":"1003.3444","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9670066357c59db28cf80b473c9e0c880fa2e1a5547a4ee6ea400a5b4cc0f586","sha256:04f9e91ee5229da2ad5dbd68dc66f673de1a4297dc2900e73877fb4b4ecedcbb"],"state_sha256":"f84b597f82dea9179965639935f7524dbbf7989cf87287311f17e8a09d904247"}