{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:ST4B7A62K4DYC5L3Y6RSCUDFIK","short_pith_number":"pith:ST4B7A62","canonical_record":{"source":{"id":"1202.5910","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-02-27T12:30:17Z","cross_cats_sorted":[],"title_canon_sha256":"8ccbdbae3145c8b4cb2a24157281a7347876c4b722bfd1e7511b52fbab5cc29f","abstract_canon_sha256":"1620da914a57ae35a1fddbbfe6b7d5a30e7e3c5c5b9269c3719e889e3abd92d8"},"schema_version":"1.0"},"canonical_sha256":"94f81f83da570781757bc7a32150654280778ecf067eddd3d2fcad102c750197","source":{"kind":"arxiv","id":"1202.5910","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1202.5910","created_at":"2026-05-18T04:01:24Z"},{"alias_kind":"arxiv_version","alias_value":"1202.5910v1","created_at":"2026-05-18T04:01:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1202.5910","created_at":"2026-05-18T04:01:24Z"},{"alias_kind":"pith_short_12","alias_value":"ST4B7A62K4DY","created_at":"2026-05-18T12:27:23Z"},{"alias_kind":"pith_short_16","alias_value":"ST4B7A62K4DYC5L3","created_at":"2026-05-18T12:27:23Z"},{"alias_kind":"pith_short_8","alias_value":"ST4B7A62","created_at":"2026-05-18T12:27:23Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:ST4B7A62K4DYC5L3Y6RSCUDFIK","target":"record","payload":{"canonical_record":{"source":{"id":"1202.5910","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-02-27T12:30:17Z","cross_cats_sorted":[],"title_canon_sha256":"8ccbdbae3145c8b4cb2a24157281a7347876c4b722bfd1e7511b52fbab5cc29f","abstract_canon_sha256":"1620da914a57ae35a1fddbbfe6b7d5a30e7e3c5c5b9269c3719e889e3abd92d8"},"schema_version":"1.0"},"canonical_sha256":"94f81f83da570781757bc7a32150654280778ecf067eddd3d2fcad102c750197","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:01:24.346402Z","signature_b64":"mc10HZXz2oU0CVmtwkWlSDRSu/BcNxxE/tsTCYSm6Gd4vLaWnUTjy9jDTVsojQF0s1hAkxZtfe9p4HYiZgkpCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"94f81f83da570781757bc7a32150654280778ecf067eddd3d2fcad102c750197","last_reissued_at":"2026-05-18T04:01:24.345703Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:01:24.345703Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1202.5910","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":"2026-05-18T04:01:24Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WpbE6gM+Si6NTkiahSAbLgQYNnvM9k7hrJCsLEmRRMUVnlk2jFmNWCm1DXn7YV9yiF17L42EcHf7M904sHVBDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-09T09:26:33.879488Z"},"content_sha256":"5e91ae5f99bd86189d41dce6307f14cca8e0500b2369b10e4b377d873df9c603","schema_version":"1.0","event_id":"sha256:5e91ae5f99bd86189d41dce6307f14cca8e0500b2369b10e4b377d873df9c603"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:ST4B7A62K4DYC5L3Y6RSCUDFIK","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Twin Telescope observations of the Sun at Kodaikanal Observatory","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"B. Ravindra, Jagdev Singh","submitted_at":"2012-02-27T12:30:17Z","abstract_excerpt":"We report the design, fabrication and installation of a 'Twin Telescope' at Kodaikanal Observatory intended to augment the ongoing synoptic observations of the Sun that has been carried out since 1904. The telescope uses a 15 cm objective capable of taking Ca-K line filtergrams and photoheliograms in continuum of the full disk of the Sun simultaneously, at a frequency of 0.1 Hz using 2kx2k format CCD cameras. The telescope has been in operation since February 2008 and images are being obtained at a cadence of 5 min during normal observing periods. In case of solar activity, images of the activ"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1202.5910","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":""},"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":"2026-05-18T04:01:24Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"lKNxA6mMOk17ZGsrBxOgXQY7Zwx8DD+OScpNjuzhWc2NCm0qwjGU0xOeJDhO8Ua+DaA26EEsEbzsUzNVhOUJAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-09T09:26:33.879864Z"},"content_sha256":"81b5faddcc697223803e1a0f21372831069e60e90d098a0ad9a769168d150f59","schema_version":"1.0","event_id":"sha256:81b5faddcc697223803e1a0f21372831069e60e90d098a0ad9a769168d150f59"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ST4B7A62K4DYC5L3Y6RSCUDFIK/bundle.json","state_url":"https://pith.science/pith/ST4B7A62K4DYC5L3Y6RSCUDFIK/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ST4B7A62K4DYC5L3Y6RSCUDFIK/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":"2026-06-09T09:26:33Z","links":{"resolver":"https://pith.science/pith/ST4B7A62K4DYC5L3Y6RSCUDFIK","bundle":"https://pith.science/pith/ST4B7A62K4DYC5L3Y6RSCUDFIK/bundle.json","state":"https://pith.science/pith/ST4B7A62K4DYC5L3Y6RSCUDFIK/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ST4B7A62K4DYC5L3Y6RSCUDFIK/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:ST4B7A62K4DYC5L3Y6RSCUDFIK","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":"1620da914a57ae35a1fddbbfe6b7d5a30e7e3c5c5b9269c3719e889e3abd92d8","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-02-27T12:30:17Z","title_canon_sha256":"8ccbdbae3145c8b4cb2a24157281a7347876c4b722bfd1e7511b52fbab5cc29f"},"schema_version":"1.0","source":{"id":"1202.5910","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1202.5910","created_at":"2026-05-18T04:01:24Z"},{"alias_kind":"arxiv_version","alias_value":"1202.5910v1","created_at":"2026-05-18T04:01:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1202.5910","created_at":"2026-05-18T04:01:24Z"},{"alias_kind":"pith_short_12","alias_value":"ST4B7A62K4DY","created_at":"2026-05-18T12:27:23Z"},{"alias_kind":"pith_short_16","alias_value":"ST4B7A62K4DYC5L3","created_at":"2026-05-18T12:27:23Z"},{"alias_kind":"pith_short_8","alias_value":"ST4B7A62","created_at":"2026-05-18T12:27:23Z"}],"graph_snapshots":[{"event_id":"sha256:81b5faddcc697223803e1a0f21372831069e60e90d098a0ad9a769168d150f59","target":"graph","created_at":"2026-05-18T04:01:24Z","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 design, fabrication and installation of a 'Twin Telescope' at Kodaikanal Observatory intended to augment the ongoing synoptic observations of the Sun that has been carried out since 1904. The telescope uses a 15 cm objective capable of taking Ca-K line filtergrams and photoheliograms in continuum of the full disk of the Sun simultaneously, at a frequency of 0.1 Hz using 2kx2k format CCD cameras. The telescope has been in operation since February 2008 and images are being obtained at a cadence of 5 min during normal observing periods. In case of solar activity, images of the activ","authors_text":"B. Ravindra, Jagdev Singh","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-02-27T12:30:17Z","title":"Twin Telescope observations of the Sun at Kodaikanal Observatory"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1202.5910","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":"sha256:5e91ae5f99bd86189d41dce6307f14cca8e0500b2369b10e4b377d873df9c603","target":"record","created_at":"2026-05-18T04:01:24Z","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":"1620da914a57ae35a1fddbbfe6b7d5a30e7e3c5c5b9269c3719e889e3abd92d8","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-02-27T12:30:17Z","title_canon_sha256":"8ccbdbae3145c8b4cb2a24157281a7347876c4b722bfd1e7511b52fbab5cc29f"},"schema_version":"1.0","source":{"id":"1202.5910","kind":"arxiv","version":1}},"canonical_sha256":"94f81f83da570781757bc7a32150654280778ecf067eddd3d2fcad102c750197","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"94f81f83da570781757bc7a32150654280778ecf067eddd3d2fcad102c750197","first_computed_at":"2026-05-18T04:01:24.345703Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:01:24.345703Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"mc10HZXz2oU0CVmtwkWlSDRSu/BcNxxE/tsTCYSm6Gd4vLaWnUTjy9jDTVsojQF0s1hAkxZtfe9p4HYiZgkpCA==","signature_status":"signed_v1","signed_at":"2026-05-18T04:01:24.346402Z","signed_message":"canonical_sha256_bytes"},"source_id":"1202.5910","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:5e91ae5f99bd86189d41dce6307f14cca8e0500b2369b10e4b377d873df9c603","sha256:81b5faddcc697223803e1a0f21372831069e60e90d098a0ad9a769168d150f59"],"state_sha256":"59074b2a1cf46bf058da694eb30061eb5c9fd97b111815ab4366780552cff23d"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"UC3eZ2lAe4dUiX10KQPJIAXPBj1ATcg8xfdcH1JfWWWjWz+7HNXirYr6oVczbrzV7ODdimrD5T4ztkI6D37CDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-09T09:26:33.881898Z","bundle_sha256":"50414781f859fd9da69f273e07e87b80255be9f4f106e169e429c8fce6552344"}}