{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:AYZ2AEPYASO2O6K2ZPTKWVH6GV","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":"4d27f30ed52bbea8fde1301d8ba3216da00033b8b28faa679e51a37b606d4efc","cross_cats_sorted":["astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-10-30T18:16:26Z","title_canon_sha256":"8bdb30382ce7e4619b7c8138ceb2f11bcbcc21ba2e065cd264422fd91bf3fc6f"},"schema_version":"1.0","source":{"id":"1510.09180","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1510.09180","created_at":"2026-05-18T01:22:00Z"},{"alias_kind":"arxiv_version","alias_value":"1510.09180v2","created_at":"2026-05-18T01:22:00Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1510.09180","created_at":"2026-05-18T01:22:00Z"},{"alias_kind":"pith_short_12","alias_value":"AYZ2AEPYASO2","created_at":"2026-05-18T12:29:14Z"},{"alias_kind":"pith_short_16","alias_value":"AYZ2AEPYASO2O6K2","created_at":"2026-05-18T12:29:14Z"},{"alias_kind":"pith_short_8","alias_value":"AYZ2AEPY","created_at":"2026-05-18T12:29:14Z"}],"graph_snapshots":[{"event_id":"sha256:3f40b958b731eeca8299eed884dd0c09cd50b1e4ec236fc1d8941adb8b96958b","target":"graph","created_at":"2026-05-18T01:22:00Z","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":"Kepler and K2 data analysis reported in the literature is mostly based on aperture photometry. Because of Kepler's large, undersampled pixels and the presence of nearby sources, aperture photometry is not always the ideal way to obtain high-precision photometry and, because of this, the data set has not been fully exploited so far. We present a new method that builds on our experience with undersampled HST images. The method involves a point-spread function (PSF) neighbour-subtraction and was specifically developed to exploit the huge potential offered by the K2 \"super-stamps\" covering the cor","authors_text":"D. Nardiello, G. Piotto, L. R. Bedin, M. Libralato","cross_cats":["astro-ph.IM"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-10-30T18:16:26Z","title":"A PSF-based approach to Kepler/K2 data. I. Variability within the K2 Campaign 0 star clusters M 35 and NGC 2158"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1510.09180","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":"sha256:41f8cc2cea3f8409e7000d3b428e2fec334132add70897c5f4a166ae130695cc","target":"record","created_at":"2026-05-18T01:22:00Z","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":"4d27f30ed52bbea8fde1301d8ba3216da00033b8b28faa679e51a37b606d4efc","cross_cats_sorted":["astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-10-30T18:16:26Z","title_canon_sha256":"8bdb30382ce7e4619b7c8138ceb2f11bcbcc21ba2e065cd264422fd91bf3fc6f"},"schema_version":"1.0","source":{"id":"1510.09180","kind":"arxiv","version":2}},"canonical_sha256":"0633a011f8049da7795acbe6ab54fe3567d31fc8470a1852cf3387123d06778a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0633a011f8049da7795acbe6ab54fe3567d31fc8470a1852cf3387123d06778a","first_computed_at":"2026-05-18T01:22:00.677038Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:22:00.677038Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ma4W7xtYvzIw0KBUCR9TvfyTqw6pSrZ7FjiTH5rze+t5mZO/Ak/qCvxcUYRJsdY8Pk9hf/Pw2JREbnQ1KwiUCQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:22:00.677491Z","signed_message":"canonical_sha256_bytes"},"source_id":"1510.09180","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:41f8cc2cea3f8409e7000d3b428e2fec334132add70897c5f4a166ae130695cc","sha256:3f40b958b731eeca8299eed884dd0c09cd50b1e4ec236fc1d8941adb8b96958b"],"state_sha256":"f3cc7712a1a6e4022661c63b33d16db7d97129ef8e69af9fe22863bb29c2eaac"}