{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:HU2RVSICEL27GORXPSP5PSJAFK","short_pith_number":"pith:HU2RVSIC","canonical_record":{"source":{"id":"1902.08085","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2019-02-21T14:58:55Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"1ce1be6fcba54cf23ab170a472c7df27182ad3f68f3e42498703172db65a0c04","abstract_canon_sha256":"183de40e16c96e64fde3ee4ab678b9c37800fb7a6b706a06262098f590d8b3af"},"schema_version":"1.0"},"canonical_sha256":"3d351ac90222f5f33a377c9fd7c9202aba40b055d8f60952855cf02d297d891f","source":{"kind":"arxiv","id":"1902.08085","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1902.08085","created_at":"2026-05-17T23:53:02Z"},{"alias_kind":"arxiv_version","alias_value":"1902.08085v1","created_at":"2026-05-17T23:53:02Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1902.08085","created_at":"2026-05-17T23:53:02Z"},{"alias_kind":"pith_short_12","alias_value":"HU2RVSICEL27","created_at":"2026-05-18T12:33:18Z"},{"alias_kind":"pith_short_16","alias_value":"HU2RVSICEL27GORX","created_at":"2026-05-18T12:33:18Z"},{"alias_kind":"pith_short_8","alias_value":"HU2RVSIC","created_at":"2026-05-18T12:33:18Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:HU2RVSICEL27GORXPSP5PSJAFK","target":"record","payload":{"canonical_record":{"source":{"id":"1902.08085","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2019-02-21T14:58:55Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"1ce1be6fcba54cf23ab170a472c7df27182ad3f68f3e42498703172db65a0c04","abstract_canon_sha256":"183de40e16c96e64fde3ee4ab678b9c37800fb7a6b706a06262098f590d8b3af"},"schema_version":"1.0"},"canonical_sha256":"3d351ac90222f5f33a377c9fd7c9202aba40b055d8f60952855cf02d297d891f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:53:02.113906Z","signature_b64":"3agHfYyf8xizLaNga7uZXeZE3A/0tKZZHPsp/7PDTqzx5UhDO8ITxR3H0yE/f7zWXy4Z0GdVs3xQkUyTgYWnCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3d351ac90222f5f33a377c9fd7c9202aba40b055d8f60952855cf02d297d891f","last_reissued_at":"2026-05-17T23:53:02.113399Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:53:02.113399Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1902.08085","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":"2026-05-17T23:53:02Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"viaSq/pORM0reldM4ocQg+66vDI34i4rdRMXAkEkkZrrIhtrfmyed3FJ3QZ75N15YTHFN151tEmNb2FGCHZaAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T14:19:59.234477Z"},"content_sha256":"bedcaee285c34b9bdfc571e49be8042a002a06d4f3d9b7e18b1155c9010a3c6c","schema_version":"1.0","event_id":"sha256:bedcaee285c34b9bdfc571e49be8042a002a06d4f3d9b7e18b1155c9010a3c6c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:HU2RVSICEL27GORXPSP5PSJAFK","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Variable stars in Palomar 13; an evaporating globular cluster","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.SR","authors_text":"A. Arellano Ferro, Christine Allen, K.P. Schroeder, M. A. Yepeza, S. Muneer, Sunetra Giridhar","submitted_at":"2019-02-21T14:58:55Z","abstract_excerpt":"We present new CCD $VI$ photometry of the distant globular cluster Pal 13. Fourier decomposition of the light curves of the three cluster member RRab stars lead to estimations of [Fe/H]=-1.65, and a distance of 23.67$\\pm$0.57 kpc. Light and colour near minimum phases for RRab stars leads to an estimate of $E(B-V)$=0.104 $\\pm$ 0.001. A $V/(V-I)$ colour-magnitude diagram, built exclusively with likely star members, shows consistency with the above parameters and an age of 12 Gyrs. A search of variable stars in the field of view of our images revealed the variability of a red giant cluster member"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1902.08085","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":"2026-05-17T23:53:02Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"yh/PTcGF6Rnry6aNXymMPr3JBOV5ZTq1+msdg77BZdzJbhsi+XOt1IC9B4dTemDeKmHK6Q7aWI49VzKv7NA3BQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T14:19:59.234852Z"},"content_sha256":"0915cbf8137d07983d83d6aedeb08e012f98032580534a43c6b771a05273031e","schema_version":"1.0","event_id":"sha256:0915cbf8137d07983d83d6aedeb08e012f98032580534a43c6b771a05273031e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/HU2RVSICEL27GORXPSP5PSJAFK/bundle.json","state_url":"https://pith.science/pith/HU2RVSICEL27GORXPSP5PSJAFK/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/HU2RVSICEL27GORXPSP5PSJAFK/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":"2026-06-02T14:19:59Z","links":{"resolver":"https://pith.science/pith/HU2RVSICEL27GORXPSP5PSJAFK","bundle":"https://pith.science/pith/HU2RVSICEL27GORXPSP5PSJAFK/bundle.json","state":"https://pith.science/pith/HU2RVSICEL27GORXPSP5PSJAFK/state.json","well_known_bundle":"https://pith.science/.well-known/pith/HU2RVSICEL27GORXPSP5PSJAFK/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:HU2RVSICEL27GORXPSP5PSJAFK","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":"183de40e16c96e64fde3ee4ab678b9c37800fb7a6b706a06262098f590d8b3af","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2019-02-21T14:58:55Z","title_canon_sha256":"1ce1be6fcba54cf23ab170a472c7df27182ad3f68f3e42498703172db65a0c04"},"schema_version":"1.0","source":{"id":"1902.08085","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1902.08085","created_at":"2026-05-17T23:53:02Z"},{"alias_kind":"arxiv_version","alias_value":"1902.08085v1","created_at":"2026-05-17T23:53:02Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1902.08085","created_at":"2026-05-17T23:53:02Z"},{"alias_kind":"pith_short_12","alias_value":"HU2RVSICEL27","created_at":"2026-05-18T12:33:18Z"},{"alias_kind":"pith_short_16","alias_value":"HU2RVSICEL27GORX","created_at":"2026-05-18T12:33:18Z"},{"alias_kind":"pith_short_8","alias_value":"HU2RVSIC","created_at":"2026-05-18T12:33:18Z"}],"graph_snapshots":[{"event_id":"sha256:0915cbf8137d07983d83d6aedeb08e012f98032580534a43c6b771a05273031e","target":"graph","created_at":"2026-05-17T23:53:02Z","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 present new CCD $VI$ photometry of the distant globular cluster Pal 13. Fourier decomposition of the light curves of the three cluster member RRab stars lead to estimations of [Fe/H]=-1.65, and a distance of 23.67$\\pm$0.57 kpc. Light and colour near minimum phases for RRab stars leads to an estimate of $E(B-V)$=0.104 $\\pm$ 0.001. A $V/(V-I)$ colour-magnitude diagram, built exclusively with likely star members, shows consistency with the above parameters and an age of 12 Gyrs. A search of variable stars in the field of view of our images revealed the variability of a red giant cluster member","authors_text":"A. Arellano Ferro, Christine Allen, K.P. Schroeder, M. A. Yepeza, S. Muneer, Sunetra Giridhar","cross_cats":["astro-ph.GA"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2019-02-21T14:58:55Z","title":"Variable stars in Palomar 13; an evaporating globular cluster"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1902.08085","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:bedcaee285c34b9bdfc571e49be8042a002a06d4f3d9b7e18b1155c9010a3c6c","target":"record","created_at":"2026-05-17T23:53:02Z","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":"183de40e16c96e64fde3ee4ab678b9c37800fb7a6b706a06262098f590d8b3af","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2019-02-21T14:58:55Z","title_canon_sha256":"1ce1be6fcba54cf23ab170a472c7df27182ad3f68f3e42498703172db65a0c04"},"schema_version":"1.0","source":{"id":"1902.08085","kind":"arxiv","version":1}},"canonical_sha256":"3d351ac90222f5f33a377c9fd7c9202aba40b055d8f60952855cf02d297d891f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3d351ac90222f5f33a377c9fd7c9202aba40b055d8f60952855cf02d297d891f","first_computed_at":"2026-05-17T23:53:02.113399Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:53:02.113399Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"3agHfYyf8xizLaNga7uZXeZE3A/0tKZZHPsp/7PDTqzx5UhDO8ITxR3H0yE/f7zWXy4Z0GdVs3xQkUyTgYWnCQ==","signature_status":"signed_v1","signed_at":"2026-05-17T23:53:02.113906Z","signed_message":"canonical_sha256_bytes"},"source_id":"1902.08085","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:bedcaee285c34b9bdfc571e49be8042a002a06d4f3d9b7e18b1155c9010a3c6c","sha256:0915cbf8137d07983d83d6aedeb08e012f98032580534a43c6b771a05273031e"],"state_sha256":"c08eb83eaf3fa43738a330aa7872caeaee992d1b5a7c01b2dcb25a5a501d6178"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Qz8YXThXTbsbIases5YOrw6UUi/OpfxedWcaSmuUsaKSVXFGBnH3zqKpQZHLqJZgvAwDwCfhUt4Qw3VtG8k2Bw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-02T14:19:59.237054Z","bundle_sha256":"36194e682c34f847cd0fd940de26c5d594624c47c6022e04c0de3814ef09f016"}}