{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:ZB64FGSS7KS2IY3O3UVV6UWX44","short_pith_number":"pith:ZB64FGSS","canonical_record":{"source":{"id":"1602.01912","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2016-02-05T02:49:51Z","cross_cats_sorted":["astro-ph.EP","astro-ph.HE"],"title_canon_sha256":"05215d022fc440246f36d276d3effbcbf52c83d15cc2234fcfd450eec7c45477","abstract_canon_sha256":"ec6341150c18c5b46a68942ebf99a765004c243a3544967315504927669aa866"},"schema_version":"1.0"},"canonical_sha256":"c87dc29a52faa5a4636edd2b5f52d7e7263b65159242dd415536ccb6c156a017","source":{"kind":"arxiv","id":"1602.01912","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1602.01912","created_at":"2026-05-18T01:16:14Z"},{"alias_kind":"arxiv_version","alias_value":"1602.01912v1","created_at":"2026-05-18T01:16:14Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1602.01912","created_at":"2026-05-18T01:16:14Z"},{"alias_kind":"pith_short_12","alias_value":"ZB64FGSS7KS2","created_at":"2026-05-18T12:30:53Z"},{"alias_kind":"pith_short_16","alias_value":"ZB64FGSS7KS2IY3O","created_at":"2026-05-18T12:30:53Z"},{"alias_kind":"pith_short_8","alias_value":"ZB64FGSS","created_at":"2026-05-18T12:30:53Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:ZB64FGSS7KS2IY3O3UVV6UWX44","target":"record","payload":{"canonical_record":{"source":{"id":"1602.01912","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2016-02-05T02:49:51Z","cross_cats_sorted":["astro-ph.EP","astro-ph.HE"],"title_canon_sha256":"05215d022fc440246f36d276d3effbcbf52c83d15cc2234fcfd450eec7c45477","abstract_canon_sha256":"ec6341150c18c5b46a68942ebf99a765004c243a3544967315504927669aa866"},"schema_version":"1.0"},"canonical_sha256":"c87dc29a52faa5a4636edd2b5f52d7e7263b65159242dd415536ccb6c156a017","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:16:14.282285Z","signature_b64":"RiHYxQMBh65jy1vxNJqYsO2U3fyLAkHaCoZ4riyRM94z+OdpMCrIoN9DAR37dLvnjpRqoMaA8oR6vjXM469XAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c87dc29a52faa5a4636edd2b5f52d7e7263b65159242dd415536ccb6c156a017","last_reissued_at":"2026-05-18T01:16:14.281606Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:16:14.281606Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1602.01912","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":"2026-05-18T01:16:14Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bO3DszfV9jallUt5KpFq+lNu0yxVDf3kCXfdiIi5mYsXL+iNL/Qo27svWvd+V89eP4IzOqmCkBPoVvyEJEF4Aw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T08:53:04.179393Z"},"content_sha256":"59d8197130c73d790a4d51768a1fb5e1ca8b671eb3a7daa8006c659e975817b6","schema_version":"1.0","event_id":"sha256:59d8197130c73d790a4d51768a1fb5e1ca8b671eb3a7daa8006c659e975817b6"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:ZB64FGSS7KS2IY3O3UVV6UWX44","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Living with a Red Dwarf: Rotation and X-ray and Ultraviolet Properties of the Halo Population Kapteyn's Star","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.EP","astro-ph.HE"],"primary_cat":"astro-ph.SR","authors_text":"Allyn Durbin, Edward F. Guinan, Scott G. Engle","submitted_at":"2016-02-05T02:49:51Z","abstract_excerpt":"As part of Villanova's Living with a Red Dwarf program, we have obtained UV, X-ray and optical data of the Population II red dwarf -- Kapteyn's Star. Kapteyn's Star is noteworthy for its large proper motions and high RV of ~+245 km s^-1. As the nearest Pop II red dwarf, it serves as an old age anchor for calibrating Activity/Irradiance-Rotation-Age relations, and an important test bed for stellar dynamos and the resulting X-ray -- UV emissions of slowly rotating, near-fully convective red dwarf stars. Adding to the notoriety, Kapteyn's Star has recently been reported to host two super-Earth ca"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1602.01912","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":"2026-05-18T01:16:14Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ZdeSvx5lt0TQXl8EaKgKL5OMZY+ISxzPTKXX2zfUhlqd9gEHmKDPC6a6zczHwLuZUxQT2EC2uYkrvJE4uX0OBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T08:53:04.179995Z"},"content_sha256":"68dc9d5910448dbc1f430a811371f4a819ee4fdab7e65732cb6184992db2aac1","schema_version":"1.0","event_id":"sha256:68dc9d5910448dbc1f430a811371f4a819ee4fdab7e65732cb6184992db2aac1"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ZB64FGSS7KS2IY3O3UVV6UWX44/bundle.json","state_url":"https://pith.science/pith/ZB64FGSS7KS2IY3O3UVV6UWX44/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ZB64FGSS7KS2IY3O3UVV6UWX44/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":"2026-05-30T08:53:04Z","links":{"resolver":"https://pith.science/pith/ZB64FGSS7KS2IY3O3UVV6UWX44","bundle":"https://pith.science/pith/ZB64FGSS7KS2IY3O3UVV6UWX44/bundle.json","state":"https://pith.science/pith/ZB64FGSS7KS2IY3O3UVV6UWX44/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ZB64FGSS7KS2IY3O3UVV6UWX44/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:ZB64FGSS7KS2IY3O3UVV6UWX44","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":"ec6341150c18c5b46a68942ebf99a765004c243a3544967315504927669aa866","cross_cats_sorted":["astro-ph.EP","astro-ph.HE"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2016-02-05T02:49:51Z","title_canon_sha256":"05215d022fc440246f36d276d3effbcbf52c83d15cc2234fcfd450eec7c45477"},"schema_version":"1.0","source":{"id":"1602.01912","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1602.01912","created_at":"2026-05-18T01:16:14Z"},{"alias_kind":"arxiv_version","alias_value":"1602.01912v1","created_at":"2026-05-18T01:16:14Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1602.01912","created_at":"2026-05-18T01:16:14Z"},{"alias_kind":"pith_short_12","alias_value":"ZB64FGSS7KS2","created_at":"2026-05-18T12:30:53Z"},{"alias_kind":"pith_short_16","alias_value":"ZB64FGSS7KS2IY3O","created_at":"2026-05-18T12:30:53Z"},{"alias_kind":"pith_short_8","alias_value":"ZB64FGSS","created_at":"2026-05-18T12:30:53Z"}],"graph_snapshots":[{"event_id":"sha256:68dc9d5910448dbc1f430a811371f4a819ee4fdab7e65732cb6184992db2aac1","target":"graph","created_at":"2026-05-18T01:16:14Z","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":"As part of Villanova's Living with a Red Dwarf program, we have obtained UV, X-ray and optical data of the Population II red dwarf -- Kapteyn's Star. Kapteyn's Star is noteworthy for its large proper motions and high RV of ~+245 km s^-1. As the nearest Pop II red dwarf, it serves as an old age anchor for calibrating Activity/Irradiance-Rotation-Age relations, and an important test bed for stellar dynamos and the resulting X-ray -- UV emissions of slowly rotating, near-fully convective red dwarf stars. Adding to the notoriety, Kapteyn's Star has recently been reported to host two super-Earth ca","authors_text":"Allyn Durbin, Edward F. Guinan, Scott G. Engle","cross_cats":["astro-ph.EP","astro-ph.HE"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2016-02-05T02:49:51Z","title":"Living with a Red Dwarf: Rotation and X-ray and Ultraviolet Properties of the Halo Population Kapteyn's Star"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1602.01912","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":"sha256:59d8197130c73d790a4d51768a1fb5e1ca8b671eb3a7daa8006c659e975817b6","target":"record","created_at":"2026-05-18T01:16:14Z","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":"ec6341150c18c5b46a68942ebf99a765004c243a3544967315504927669aa866","cross_cats_sorted":["astro-ph.EP","astro-ph.HE"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2016-02-05T02:49:51Z","title_canon_sha256":"05215d022fc440246f36d276d3effbcbf52c83d15cc2234fcfd450eec7c45477"},"schema_version":"1.0","source":{"id":"1602.01912","kind":"arxiv","version":1}},"canonical_sha256":"c87dc29a52faa5a4636edd2b5f52d7e7263b65159242dd415536ccb6c156a017","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c87dc29a52faa5a4636edd2b5f52d7e7263b65159242dd415536ccb6c156a017","first_computed_at":"2026-05-18T01:16:14.281606Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:16:14.281606Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"RiHYxQMBh65jy1vxNJqYsO2U3fyLAkHaCoZ4riyRM94z+OdpMCrIoN9DAR37dLvnjpRqoMaA8oR6vjXM469XAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:16:14.282285Z","signed_message":"canonical_sha256_bytes"},"source_id":"1602.01912","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:59d8197130c73d790a4d51768a1fb5e1ca8b671eb3a7daa8006c659e975817b6","sha256:68dc9d5910448dbc1f430a811371f4a819ee4fdab7e65732cb6184992db2aac1"],"state_sha256":"12df4f09a004317760b5028ac240b735988c6566644036a53e6e9dd00d2d49c2"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"th1dqs+Bv0IGq3W8hLNkdGaw5cVEiC5PIaxJq6j1r9uLqnRLdzs+mIkYQDkEgmLf8tMNt4X+PqR2uRZyB6GLAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T08:53:04.183211Z","bundle_sha256":"06dfb79f53d2f4c39d8df9b78000863b096dc0a0dddb1e9d7ee23ef6fd9183e4"}}