{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:1995:DYZ2CZF3L7JU7MZTU4REOEZB7T","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":"185caab8e08e7b1f8a2270863b77c6ae146d07f3ec2384005ce833b3c0dc097d","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"1995-02-19T23:27:52Z","title_canon_sha256":"3dc38d9d5a68afd21a2d3cf1c21ceeb2e44c27a697f22e4e337c3bcbac49e11d"},"schema_version":"1.0","source":{"id":"astro-ph/9502084","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/9502084","created_at":"2026-05-18T01:07:42Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/9502084v1","created_at":"2026-05-18T01:07:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/9502084","created_at":"2026-05-18T01:07:42Z"},{"alias_kind":"pith_short_12","alias_value":"DYZ2CZF3L7JU","created_at":"2026-05-18T12:25:47Z"},{"alias_kind":"pith_short_16","alias_value":"DYZ2CZF3L7JU7MZT","created_at":"2026-05-18T12:25:47Z"},{"alias_kind":"pith_short_8","alias_value":"DYZ2CZF3","created_at":"2026-05-18T12:25:47Z"}],"graph_snapshots":[{"event_id":"sha256:fb1bf68cb9dd4bb2033733530fb8b7ab22c9203944bb32d8a0e29b5b3ae1090a","target":"graph","created_at":"2026-05-18T01:07:42Z","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 have obtained images of the eclipsing pulsar binary PSR~B1957+20 using the Planetary Camera of the Hubble Space Telescope. The high spatial resolution of this instrument has allowed us to separate the pulsar system from a nearby background star which has confounded ground-based observations of this system near optical minimum. Our images limit the temperature of the backside of the companion to $T \\simlt 2800$~K, about a factor of two less than the average temperature of the side of the companion facing the pulsar, and provide a marginal detection of the companion at optical minimum. The ma","authors_text":"Andrew S. Fruchter, Charles D. Bailyn, Jay Bookbinder","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"1995-02-19T23:27:52Z","title":"HST Images of the Eclipsing Pulsar B1957+20"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9502084","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":"sha256:25ca84a069dba609e4c5e8bd97109de564ab8a223241a349b97c2fe7bdbe5647","target":"record","created_at":"2026-05-18T01:07:42Z","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":"185caab8e08e7b1f8a2270863b77c6ae146d07f3ec2384005ce833b3c0dc097d","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"1995-02-19T23:27:52Z","title_canon_sha256":"3dc38d9d5a68afd21a2d3cf1c21ceeb2e44c27a697f22e4e337c3bcbac49e11d"},"schema_version":"1.0","source":{"id":"astro-ph/9502084","kind":"arxiv","version":1}},"canonical_sha256":"1e33a164bb5fd34fb333a722471321fcc2f69736010a4eb3c4b5afc2debadf47","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"1e33a164bb5fd34fb333a722471321fcc2f69736010a4eb3c4b5afc2debadf47","first_computed_at":"2026-05-18T01:07:42.130115Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:07:42.130115Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"E5bmJVOU7FxOJ+sh0gZxAWbRFuESvESWixu4SHvwXyi3BuUV9p8ChYLlGED3jVwP/OOGjczO8U/ZjNbIFffwDw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:07:42.130532Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/9502084","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:25ca84a069dba609e4c5e8bd97109de564ab8a223241a349b97c2fe7bdbe5647","sha256:fb1bf68cb9dd4bb2033733530fb8b7ab22c9203944bb32d8a0e29b5b3ae1090a"],"state_sha256":"5cd1d2186fab8c2c2d7ef9f78e35fba070937f4701aac5914a64faaefaff5980"}