{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:1997:USG6KZ6SR4QD23CI5BO2Y5A3M2","short_pith_number":"pith:USG6KZ6S","canonical_record":{"source":{"id":"astro-ph/9706108","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"1997-06-11T14:36:36Z","cross_cats_sorted":[],"title_canon_sha256":"9c121f27b4cb8e6b5584927ad41248bae1f52355597dcefc2fdac8f164df2c32","abstract_canon_sha256":"ee47a70d6c52b4c93059f6ad994341e6e8df0f3104326e1c20cc483451cb6ae4"},"schema_version":"1.0"},"canonical_sha256":"a48de567d28f203d6c48e85dac741b669df50b7380d9a1e070ccbb1382ca150b","source":{"kind":"arxiv","id":"astro-ph/9706108","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/9706108","created_at":"2026-07-04T14:15:09Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/9706108v1","created_at":"2026-07-04T14:15:09Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/9706108","created_at":"2026-07-04T14:15:09Z"},{"alias_kind":"pith_short_12","alias_value":"USG6KZ6SR4QD","created_at":"2026-07-04T14:15:09Z"},{"alias_kind":"pith_short_16","alias_value":"USG6KZ6SR4QD23CI","created_at":"2026-07-04T14:15:09Z"},{"alias_kind":"pith_short_8","alias_value":"USG6KZ6S","created_at":"2026-07-04T14:15:09Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:1997:USG6KZ6SR4QD23CI5BO2Y5A3M2","target":"record","payload":{"canonical_record":{"source":{"id":"astro-ph/9706108","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"1997-06-11T14:36:36Z","cross_cats_sorted":[],"title_canon_sha256":"9c121f27b4cb8e6b5584927ad41248bae1f52355597dcefc2fdac8f164df2c32","abstract_canon_sha256":"ee47a70d6c52b4c93059f6ad994341e6e8df0f3104326e1c20cc483451cb6ae4"},"schema_version":"1.0"},"canonical_sha256":"a48de567d28f203d6c48e85dac741b669df50b7380d9a1e070ccbb1382ca150b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T14:15:09.489903Z","signature_b64":"TIPyY/NPcBsl13IsSMzVY4jIojqCfq3dGj4ibzuPX66CIu/bnKAa+oQe9dnu14kqpN9aUq0Wqo7tU2Zp1gRtDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a48de567d28f203d6c48e85dac741b669df50b7380d9a1e070ccbb1382ca150b","last_reissued_at":"2026-07-04T14:15:09.489558Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T14:15:09.489558Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"astro-ph/9706108","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-04T14:15:09Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"PosFKy/Uh3zCjHtYMZWv3X4KlA5Db5erXVniz/VulGcknutL3dK/sq/738VyAoeRFK9hgeAjApjd+zdQM6cnAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-05T09:29:03.195758Z"},"content_sha256":"c6de0b0fdc74426dd312c3fa13744d17bc71d8c30a9f3268ac1ea8c18045086e","schema_version":"1.0","event_id":"sha256:c6de0b0fdc74426dd312c3fa13744d17bc71d8c30a9f3268ac1ea8c18045086e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:1997:USG6KZ6SR4QD23CI5BO2Y5A3M2","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Astronomical Research with liquid mirror telescopes","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"E. F. Borra","submitted_at":"1997-06-11T14:36:36Z","abstract_excerpt":"I discuss the modalities of zenith observing with LMTs, their limitations and advantages. The main limitation comes from the relatively small regions of the sky that LMTs can access. The main advantage comes from low cost, for inexpensive large LMTs can be dedicated to very specialized goals. Large surveys, cosmological studies, variability studies are prime examples of astronomical research where LMTs can have a major impact. I examine the performance of a 4-m telescope equipped with wide band filters and its use for astronomical research. The data could be used to select targets for the VLT."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9706108","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/astro-ph/9706108/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-04T14:15:09Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"c4PvL7nfYx8b6KjiQgKcDacq3ORY8MbO1CXP0bhPXRdIPy0VgK0tVcEuC510LCsC66OfEiKDG7SITbkhkNWuCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-05T09:29:03.196137Z"},"content_sha256":"e191182097d52989e0e56f2424216b3f2a4c4b8151080cd88a1e5fa2519b07e6","schema_version":"1.0","event_id":"sha256:e191182097d52989e0e56f2424216b3f2a4c4b8151080cd88a1e5fa2519b07e6"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/USG6KZ6SR4QD23CI5BO2Y5A3M2/bundle.json","state_url":"https://pith.science/pith/USG6KZ6SR4QD23CI5BO2Y5A3M2/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/USG6KZ6SR4QD23CI5BO2Y5A3M2/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":"2026-07-05T09:29:03Z","links":{"resolver":"https://pith.science/pith/USG6KZ6SR4QD23CI5BO2Y5A3M2","bundle":"https://pith.science/pith/USG6KZ6SR4QD23CI5BO2Y5A3M2/bundle.json","state":"https://pith.science/pith/USG6KZ6SR4QD23CI5BO2Y5A3M2/state.json","well_known_bundle":"https://pith.science/.well-known/pith/USG6KZ6SR4QD23CI5BO2Y5A3M2/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:1997:USG6KZ6SR4QD23CI5BO2Y5A3M2","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":"ee47a70d6c52b4c93059f6ad994341e6e8df0f3104326e1c20cc483451cb6ae4","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"1997-06-11T14:36:36Z","title_canon_sha256":"9c121f27b4cb8e6b5584927ad41248bae1f52355597dcefc2fdac8f164df2c32"},"schema_version":"1.0","source":{"id":"astro-ph/9706108","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/9706108","created_at":"2026-07-04T14:15:09Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/9706108v1","created_at":"2026-07-04T14:15:09Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/9706108","created_at":"2026-07-04T14:15:09Z"},{"alias_kind":"pith_short_12","alias_value":"USG6KZ6SR4QD","created_at":"2026-07-04T14:15:09Z"},{"alias_kind":"pith_short_16","alias_value":"USG6KZ6SR4QD23CI","created_at":"2026-07-04T14:15:09Z"},{"alias_kind":"pith_short_8","alias_value":"USG6KZ6S","created_at":"2026-07-04T14:15:09Z"}],"graph_snapshots":[{"event_id":"sha256:e191182097d52989e0e56f2424216b3f2a4c4b8151080cd88a1e5fa2519b07e6","target":"graph","created_at":"2026-07-04T14:15:09Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/astro-ph/9706108/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"I discuss the modalities of zenith observing with LMTs, their limitations and advantages. The main limitation comes from the relatively small regions of the sky that LMTs can access. The main advantage comes from low cost, for inexpensive large LMTs can be dedicated to very specialized goals. Large surveys, cosmological studies, variability studies are prime examples of astronomical research where LMTs can have a major impact. I examine the performance of a 4-m telescope equipped with wide band filters and its use for astronomical research. The data could be used to select targets for the VLT.","authors_text":"E. F. Borra","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"1997-06-11T14:36:36Z","title":"Astronomical Research with liquid mirror telescopes"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9706108","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:c6de0b0fdc74426dd312c3fa13744d17bc71d8c30a9f3268ac1ea8c18045086e","target":"record","created_at":"2026-07-04T14:15:09Z","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":"ee47a70d6c52b4c93059f6ad994341e6e8df0f3104326e1c20cc483451cb6ae4","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"1997-06-11T14:36:36Z","title_canon_sha256":"9c121f27b4cb8e6b5584927ad41248bae1f52355597dcefc2fdac8f164df2c32"},"schema_version":"1.0","source":{"id":"astro-ph/9706108","kind":"arxiv","version":1}},"canonical_sha256":"a48de567d28f203d6c48e85dac741b669df50b7380d9a1e070ccbb1382ca150b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a48de567d28f203d6c48e85dac741b669df50b7380d9a1e070ccbb1382ca150b","first_computed_at":"2026-07-04T14:15:09.489558Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T14:15:09.489558Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"TIPyY/NPcBsl13IsSMzVY4jIojqCfq3dGj4ibzuPX66CIu/bnKAa+oQe9dnu14kqpN9aUq0Wqo7tU2Zp1gRtDA==","signature_status":"signed_v1","signed_at":"2026-07-04T14:15:09.489903Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/9706108","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c6de0b0fdc74426dd312c3fa13744d17bc71d8c30a9f3268ac1ea8c18045086e","sha256:e191182097d52989e0e56f2424216b3f2a4c4b8151080cd88a1e5fa2519b07e6"],"state_sha256":"e7cb17d067f3afe034e3c22bfbb53cf961c732871f96047fc9f99b2eda526bb2"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fF58vvo0jHzfbQT4EElQy/VALFIUnzPH8aF+qKgYGYdI8w6/sDsxVzkaRw2uVtFZ8C++P2xqU0d9hrmtNLEwAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-05T09:29:03.198023Z","bundle_sha256":"c2886fc51a240ced2f1fd4bfb015fbc9c9970f01da4eb2c12f65aa7cd0339372"}}