{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2010:R7LWFTZ5U2TGYSGY5RPX2Y75UZ","short_pith_number":"pith:R7LWFTZ5","canonical_record":{"source":{"id":"1008.4347","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-08-25T19:45:20Z","cross_cats_sorted":[],"title_canon_sha256":"60667e098deed16043b0e9e26e94bc6e46792cc68fc556611b11a6d30c604c7e","abstract_canon_sha256":"46690c7f1aeb4b10368218760333461eb909755bc77e708310670600e0a0678d"},"schema_version":"1.0"},"canonical_sha256":"8fd762cf3da6a66c48d8ec5f7d63fda66ed6c32ac3b57368b74a62e56113bd3b","source":{"kind":"arxiv","id":"1008.4347","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1008.4347","created_at":"2026-05-18T02:05:42Z"},{"alias_kind":"arxiv_version","alias_value":"1008.4347v1","created_at":"2026-05-18T02:05:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1008.4347","created_at":"2026-05-18T02:05:42Z"},{"alias_kind":"pith_short_12","alias_value":"R7LWFTZ5U2TG","created_at":"2026-05-18T12:26:13Z"},{"alias_kind":"pith_short_16","alias_value":"R7LWFTZ5U2TGYSGY","created_at":"2026-05-18T12:26:13Z"},{"alias_kind":"pith_short_8","alias_value":"R7LWFTZ5","created_at":"2026-05-18T12:26:13Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2010:R7LWFTZ5U2TGYSGY5RPX2Y75UZ","target":"record","payload":{"canonical_record":{"source":{"id":"1008.4347","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-08-25T19:45:20Z","cross_cats_sorted":[],"title_canon_sha256":"60667e098deed16043b0e9e26e94bc6e46792cc68fc556611b11a6d30c604c7e","abstract_canon_sha256":"46690c7f1aeb4b10368218760333461eb909755bc77e708310670600e0a0678d"},"schema_version":"1.0"},"canonical_sha256":"8fd762cf3da6a66c48d8ec5f7d63fda66ed6c32ac3b57368b74a62e56113bd3b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:05:42.765282Z","signature_b64":"nFj6ynvBTvqYBo38SoLYwCa6Stcm6jAMbzW58MP5bXUopgIc0PGUfIVFg0rQ+PQVCnaV58SrZFUdRG0BnjNcDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"8fd762cf3da6a66c48d8ec5f7d63fda66ed6c32ac3b57368b74a62e56113bd3b","last_reissued_at":"2026-05-18T02:05:42.764486Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:05:42.764486Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1008.4347","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":"2026-05-18T02:05:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"YFyp/VDH6bDcXj12658pzZw6vd0umMmdQlGUX4OxzNDXEMNkx+k+rBGFdf6wZwqQ2jqwLllSQf9kCuzjEB3pAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T18:33:25.512633Z"},"content_sha256":"4e50ea7a8def670aab6e86904a2e1493c9e5582eaf5d510a0cbb45e7af6b57fe","schema_version":"1.0","event_id":"sha256:4e50ea7a8def670aab6e86904a2e1493c9e5582eaf5d510a0cbb45e7af6b57fe"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2010:R7LWFTZ5U2TGYSGY5RPX2Y75UZ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Bright Variable Stars in NGC 6819 - An Open Cluster in the Kepler Field","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"Antonio Talamantes, David D. Balam, Eric L. Sandquist, James L. Clem, Matthew Shetrone, Russell M. Robb","submitted_at":"2010-08-25T19:45:20Z","abstract_excerpt":"We describe a variability study of the moderately old open cluster NGC 6819. We have detected 4 new detached eclipsing binaries near the cluster turnoff (one of which may be in a triple system). Several of these systems should be able to provide mass and radius information, and can therefore constrain the age of the cluster. We have also newly detected one possible detached binary member about 3.5 magnitudes below the turnoff. One EW-type binary (probably not a cluster member) shows unusually strong night-to-night light curve variations in sets of observations separated by 8 years. According t"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1008.4347","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":"2026-05-18T02:05:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"qgefc+c5irJO4IY+fWmyYooBMo8MFPtWhouptnxA+eb+dU4CHs5kCpKkreIGLZKWqeeCwCYP567vtLTjwzilCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T18:33:25.512989Z"},"content_sha256":"cd704c2ad2c2771c844ef862658f88e2b86c5a560dd00e24ef6d68bf65442573","schema_version":"1.0","event_id":"sha256:cd704c2ad2c2771c844ef862658f88e2b86c5a560dd00e24ef6d68bf65442573"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/R7LWFTZ5U2TGYSGY5RPX2Y75UZ/bundle.json","state_url":"https://pith.science/pith/R7LWFTZ5U2TGYSGY5RPX2Y75UZ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/R7LWFTZ5U2TGYSGY5RPX2Y75UZ/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":"2026-06-05T18:33:25Z","links":{"resolver":"https://pith.science/pith/R7LWFTZ5U2TGYSGY5RPX2Y75UZ","bundle":"https://pith.science/pith/R7LWFTZ5U2TGYSGY5RPX2Y75UZ/bundle.json","state":"https://pith.science/pith/R7LWFTZ5U2TGYSGY5RPX2Y75UZ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/R7LWFTZ5U2TGYSGY5RPX2Y75UZ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:R7LWFTZ5U2TGYSGY5RPX2Y75UZ","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":"46690c7f1aeb4b10368218760333461eb909755bc77e708310670600e0a0678d","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-08-25T19:45:20Z","title_canon_sha256":"60667e098deed16043b0e9e26e94bc6e46792cc68fc556611b11a6d30c604c7e"},"schema_version":"1.0","source":{"id":"1008.4347","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1008.4347","created_at":"2026-05-18T02:05:42Z"},{"alias_kind":"arxiv_version","alias_value":"1008.4347v1","created_at":"2026-05-18T02:05:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1008.4347","created_at":"2026-05-18T02:05:42Z"},{"alias_kind":"pith_short_12","alias_value":"R7LWFTZ5U2TG","created_at":"2026-05-18T12:26:13Z"},{"alias_kind":"pith_short_16","alias_value":"R7LWFTZ5U2TGYSGY","created_at":"2026-05-18T12:26:13Z"},{"alias_kind":"pith_short_8","alias_value":"R7LWFTZ5","created_at":"2026-05-18T12:26:13Z"}],"graph_snapshots":[{"event_id":"sha256:cd704c2ad2c2771c844ef862658f88e2b86c5a560dd00e24ef6d68bf65442573","target":"graph","created_at":"2026-05-18T02:05:42Z","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 describe a variability study of the moderately old open cluster NGC 6819. We have detected 4 new detached eclipsing binaries near the cluster turnoff (one of which may be in a triple system). Several of these systems should be able to provide mass and radius information, and can therefore constrain the age of the cluster. We have also newly detected one possible detached binary member about 3.5 magnitudes below the turnoff. One EW-type binary (probably not a cluster member) shows unusually strong night-to-night light curve variations in sets of observations separated by 8 years. According t","authors_text":"Antonio Talamantes, David D. Balam, Eric L. Sandquist, James L. Clem, Matthew Shetrone, Russell M. Robb","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-08-25T19:45:20Z","title":"Bright Variable Stars in NGC 6819 - An Open Cluster in the Kepler Field"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1008.4347","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":"sha256:4e50ea7a8def670aab6e86904a2e1493c9e5582eaf5d510a0cbb45e7af6b57fe","target":"record","created_at":"2026-05-18T02:05:42Z","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":"46690c7f1aeb4b10368218760333461eb909755bc77e708310670600e0a0678d","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-08-25T19:45:20Z","title_canon_sha256":"60667e098deed16043b0e9e26e94bc6e46792cc68fc556611b11a6d30c604c7e"},"schema_version":"1.0","source":{"id":"1008.4347","kind":"arxiv","version":1}},"canonical_sha256":"8fd762cf3da6a66c48d8ec5f7d63fda66ed6c32ac3b57368b74a62e56113bd3b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"8fd762cf3da6a66c48d8ec5f7d63fda66ed6c32ac3b57368b74a62e56113bd3b","first_computed_at":"2026-05-18T02:05:42.764486Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:05:42.764486Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"nFj6ynvBTvqYBo38SoLYwCa6Stcm6jAMbzW58MP5bXUopgIc0PGUfIVFg0rQ+PQVCnaV58SrZFUdRG0BnjNcDg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:05:42.765282Z","signed_message":"canonical_sha256_bytes"},"source_id":"1008.4347","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4e50ea7a8def670aab6e86904a2e1493c9e5582eaf5d510a0cbb45e7af6b57fe","sha256:cd704c2ad2c2771c844ef862658f88e2b86c5a560dd00e24ef6d68bf65442573"],"state_sha256":"b04fad766ba63ec9370704af95324046d49437de0b902afe842f292121f55621"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"oafjjIPndZl7O2mk0uTvqzq8n68aAs8E2wfugY6RqBMah6JVb0QylErErhYYa95319yXm77UDPP5z/5jFl3nCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-05T18:33:25.514959Z","bundle_sha256":"72848928599deecde1a6714ba90847487d2d8e21168db7e8d41a96ffb780c500"}}