{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:YCHZ67UU6CNYWTUWK4ICUMBYRN","short_pith_number":"pith:YCHZ67UU","canonical_record":{"source":{"id":"1308.4633","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-08-21T17:03:19Z","cross_cats_sorted":["astro-ph.HE"],"title_canon_sha256":"5abf434318fef0db1a0ae48573ccb813f340401ae64d531270891c14f2514be3","abstract_canon_sha256":"51cbe0e631e9edd2c9884df71eeb94b068364582f2f8b5526c5a03a4af87e5f3"},"schema_version":"1.0"},"canonical_sha256":"c08f9f7e94f09b8b4e9657102a30388b52a79d1f31d71bb8f7bba238580b9307","source":{"kind":"arxiv","id":"1308.4633","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1308.4633","created_at":"2026-05-18T01:48:07Z"},{"alias_kind":"arxiv_version","alias_value":"1308.4633v1","created_at":"2026-05-18T01:48:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1308.4633","created_at":"2026-05-18T01:48:07Z"},{"alias_kind":"pith_short_12","alias_value":"YCHZ67UU6CNY","created_at":"2026-05-18T12:28:06Z"},{"alias_kind":"pith_short_16","alias_value":"YCHZ67UU6CNYWTUW","created_at":"2026-05-18T12:28:06Z"},{"alias_kind":"pith_short_8","alias_value":"YCHZ67UU","created_at":"2026-05-18T12:28:06Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:YCHZ67UU6CNYWTUWK4ICUMBYRN","target":"record","payload":{"canonical_record":{"source":{"id":"1308.4633","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-08-21T17:03:19Z","cross_cats_sorted":["astro-ph.HE"],"title_canon_sha256":"5abf434318fef0db1a0ae48573ccb813f340401ae64d531270891c14f2514be3","abstract_canon_sha256":"51cbe0e631e9edd2c9884df71eeb94b068364582f2f8b5526c5a03a4af87e5f3"},"schema_version":"1.0"},"canonical_sha256":"c08f9f7e94f09b8b4e9657102a30388b52a79d1f31d71bb8f7bba238580b9307","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:48:07.085052Z","signature_b64":"zSKHPdID95Wi0Zn/uZT/EV9Zl6Dot1OZvfTg8WrnWOVbbKPgooswMPh5hjxa18U+azR15bGlM+Q9Kue11bzpCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c08f9f7e94f09b8b4e9657102a30388b52a79d1f31d71bb8f7bba238580b9307","last_reissued_at":"2026-05-18T01:48:07.084623Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:48:07.084623Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1308.4633","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":"2026-05-18T01:48:07Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rd7/CApH305KZ1pYIIqSjXS7opuT+u8t1aZADX8Q4F3xO2j0y8foRx01J3rgmqOYE9a9Rt0//SLbk4DoVzsTBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-09T02:42:03.697772Z"},"content_sha256":"1c46548945c0b3b1dc926aa6ba7c006b2faaedc175d87376ce15344c0fb0346c","schema_version":"1.0","event_id":"sha256:1c46548945c0b3b1dc926aa6ba7c006b2faaedc175d87376ce15344c0fb0346c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:YCHZ67UU6CNYWTUWK4ICUMBYRN","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Optical Proper Motion Measurements of the M87 Jet: New Results from the Hubble Space Telescope","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.HE"],"primary_cat":"astro-ph.CO","authors_text":"Colin Norman, Eileen T. Meyer, J. A. Biretta, Jay Anderson, Masanori Nakamura, Roeland P. van der Marel, Sangmo Tony Sohn, W. B. Sparks","submitted_at":"2013-08-21T17:03:19Z","abstract_excerpt":"We report new results from an HST archival program to study proper motions in the optical jet of the nearby radio galaxy M87. Using over 13 years of archival imaging, we reach accuracies below 0.1c in measuring the apparent velocities of individual knots in the jet. We confirm previous findings of speeds up to 4.5c in the inner 6\" of the jet, and report new speeds for optical components in the outer part of the jet. We find evidence of significant motion transverse to the jet axis on the order of 0.6c in the inner jet features, and superluminal velocities parallel and transverse to the jet in "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1308.4633","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":"2026-05-18T01:48:07Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ppQmu6VX56s/FAe45Dk0xyyq5Nwo1EiKozhrDavrqBnsA1g7u4z3RfpoSv7vkc5PlnvtEB7eiyuaGDY9TyCsBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-09T02:42:03.698433Z"},"content_sha256":"4f6351be59b1d24d1747794ac1725aaa2fbb573d63880409087a178c56cb7598","schema_version":"1.0","event_id":"sha256:4f6351be59b1d24d1747794ac1725aaa2fbb573d63880409087a178c56cb7598"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YCHZ67UU6CNYWTUWK4ICUMBYRN/bundle.json","state_url":"https://pith.science/pith/YCHZ67UU6CNYWTUWK4ICUMBYRN/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YCHZ67UU6CNYWTUWK4ICUMBYRN/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":"2026-06-09T02:42:03Z","links":{"resolver":"https://pith.science/pith/YCHZ67UU6CNYWTUWK4ICUMBYRN","bundle":"https://pith.science/pith/YCHZ67UU6CNYWTUWK4ICUMBYRN/bundle.json","state":"https://pith.science/pith/YCHZ67UU6CNYWTUWK4ICUMBYRN/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YCHZ67UU6CNYWTUWK4ICUMBYRN/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:YCHZ67UU6CNYWTUWK4ICUMBYRN","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":"51cbe0e631e9edd2c9884df71eeb94b068364582f2f8b5526c5a03a4af87e5f3","cross_cats_sorted":["astro-ph.HE"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-08-21T17:03:19Z","title_canon_sha256":"5abf434318fef0db1a0ae48573ccb813f340401ae64d531270891c14f2514be3"},"schema_version":"1.0","source":{"id":"1308.4633","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1308.4633","created_at":"2026-05-18T01:48:07Z"},{"alias_kind":"arxiv_version","alias_value":"1308.4633v1","created_at":"2026-05-18T01:48:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1308.4633","created_at":"2026-05-18T01:48:07Z"},{"alias_kind":"pith_short_12","alias_value":"YCHZ67UU6CNY","created_at":"2026-05-18T12:28:06Z"},{"alias_kind":"pith_short_16","alias_value":"YCHZ67UU6CNYWTUW","created_at":"2026-05-18T12:28:06Z"},{"alias_kind":"pith_short_8","alias_value":"YCHZ67UU","created_at":"2026-05-18T12:28:06Z"}],"graph_snapshots":[{"event_id":"sha256:4f6351be59b1d24d1747794ac1725aaa2fbb573d63880409087a178c56cb7598","target":"graph","created_at":"2026-05-18T01:48:07Z","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 new results from an HST archival program to study proper motions in the optical jet of the nearby radio galaxy M87. Using over 13 years of archival imaging, we reach accuracies below 0.1c in measuring the apparent velocities of individual knots in the jet. We confirm previous findings of speeds up to 4.5c in the inner 6\" of the jet, and report new speeds for optical components in the outer part of the jet. We find evidence of significant motion transverse to the jet axis on the order of 0.6c in the inner jet features, and superluminal velocities parallel and transverse to the jet in ","authors_text":"Colin Norman, Eileen T. Meyer, J. A. Biretta, Jay Anderson, Masanori Nakamura, Roeland P. van der Marel, Sangmo Tony Sohn, W. B. Sparks","cross_cats":["astro-ph.HE"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-08-21T17:03:19Z","title":"Optical Proper Motion Measurements of the M87 Jet: New Results from the Hubble Space Telescope"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1308.4633","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":"sha256:1c46548945c0b3b1dc926aa6ba7c006b2faaedc175d87376ce15344c0fb0346c","target":"record","created_at":"2026-05-18T01:48:07Z","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":"51cbe0e631e9edd2c9884df71eeb94b068364582f2f8b5526c5a03a4af87e5f3","cross_cats_sorted":["astro-ph.HE"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-08-21T17:03:19Z","title_canon_sha256":"5abf434318fef0db1a0ae48573ccb813f340401ae64d531270891c14f2514be3"},"schema_version":"1.0","source":{"id":"1308.4633","kind":"arxiv","version":1}},"canonical_sha256":"c08f9f7e94f09b8b4e9657102a30388b52a79d1f31d71bb8f7bba238580b9307","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c08f9f7e94f09b8b4e9657102a30388b52a79d1f31d71bb8f7bba238580b9307","first_computed_at":"2026-05-18T01:48:07.084623Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:48:07.084623Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"zSKHPdID95Wi0Zn/uZT/EV9Zl6Dot1OZvfTg8WrnWOVbbKPgooswMPh5hjxa18U+azR15bGlM+Q9Kue11bzpCg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:48:07.085052Z","signed_message":"canonical_sha256_bytes"},"source_id":"1308.4633","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1c46548945c0b3b1dc926aa6ba7c006b2faaedc175d87376ce15344c0fb0346c","sha256:4f6351be59b1d24d1747794ac1725aaa2fbb573d63880409087a178c56cb7598"],"state_sha256":"f2de9bb3672a494f0b2a766e5758b4012af600da7d889b68bd4b17c86cffacf2"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"TEMI6fCE+o0+Q0gnk3/A4b4I93Fx5Z2dv1Siqwrp0asXsQHsdwKHR9P4NBA8PeqfZhfTqOipVwVz3yqLECZmBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-09T02:42:03.702463Z","bundle_sha256":"e998f307f5e41481d67a842f61610fedb7f8b2802a6da0425760bf4c20592d7a"}}