{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:5RUGIVFIY2YJQQIBCBVOFSWPSV","short_pith_number":"pith:5RUGIVFI","canonical_record":{"source":{"id":"2605.29124","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.space-ph","submitted_at":"2026-05-27T21:35:27Z","cross_cats_sorted":[],"title_canon_sha256":"50ab9ab4b271a67f2ec660d48e2ca524164bf4a15e8b20a2f3afecfbaa780163","abstract_canon_sha256":"c131a91904c5e2bda94ae03f595de2dbe49e16d6fd7951368d3e847d1a01182c"},"schema_version":"1.0"},"canonical_sha256":"ec686454a8c6b0984101106ae2cacf9558da6cad28e559bee63a73c067dd072c","source":{"kind":"arxiv","id":"2605.29124","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2605.29124","created_at":"2026-05-29T01:05:19Z"},{"alias_kind":"arxiv_version","alias_value":"2605.29124v1","created_at":"2026-05-29T01:05:19Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2605.29124","created_at":"2026-05-29T01:05:19Z"},{"alias_kind":"pith_short_12","alias_value":"5RUGIVFIY2YJ","created_at":"2026-05-29T01:05:19Z"},{"alias_kind":"pith_short_16","alias_value":"5RUGIVFIY2YJQQIB","created_at":"2026-05-29T01:05:19Z"},{"alias_kind":"pith_short_8","alias_value":"5RUGIVFI","created_at":"2026-05-29T01:05:19Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:5RUGIVFIY2YJQQIBCBVOFSWPSV","target":"record","payload":{"canonical_record":{"source":{"id":"2605.29124","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.space-ph","submitted_at":"2026-05-27T21:35:27Z","cross_cats_sorted":[],"title_canon_sha256":"50ab9ab4b271a67f2ec660d48e2ca524164bf4a15e8b20a2f3afecfbaa780163","abstract_canon_sha256":"c131a91904c5e2bda94ae03f595de2dbe49e16d6fd7951368d3e847d1a01182c"},"schema_version":"1.0"},"canonical_sha256":"ec686454a8c6b0984101106ae2cacf9558da6cad28e559bee63a73c067dd072c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-29T01:05:19.547808Z","signature_b64":"7JY6DVh6sq5IKdHmBlBBdGm+v8mXnTqzWwzn4WlKVmDmqU9ToJwzcJ+GC3r33+HqKl44ZDXPqyjhC5p9smDcAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ec686454a8c6b0984101106ae2cacf9558da6cad28e559bee63a73c067dd072c","last_reissued_at":"2026-05-29T01:05:19.546931Z","signature_status":"signed_v1","first_computed_at":"2026-05-29T01:05:19.546931Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2605.29124","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":"2026-05-29T01:05:19Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"PLUBp3+KbCr5d/oyU9NjEF7sdC/GczIiU/YiRJao+6Anur5iTye8/5mrqVB8KBatH1V7R8uE/TkFytSHgd3kAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T20:22:38.893563Z"},"content_sha256":"d61fb3c46efbcc8d3005d45dde4799f2c0a3fb416b531b2642c22ae5dd8b9e91","schema_version":"1.0","event_id":"sha256:d61fb3c46efbcc8d3005d45dde4799f2c0a3fb416b531b2642c22ae5dd8b9e91"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:5RUGIVFIY2YJQQIBCBVOFSWPSV","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Optical and Radar Observations of the February 2025 Falcon 9 Upper-Stage Re-entry","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"physics.space-ph","authors_text":"Bj\\\"orn Gustavsson, Dabrowka Knach, Daniel Kastinen, Devin Huyghebaert, Gerd Baumgarten, Jorge L. Chau, Juha Vierinen, Kenneth S. Obenberger, Matthias Clahsen, Nico Pfeffer, Robin Wing, Toralf Renkwitz","submitted_at":"2026-05-27T21:35:27Z","abstract_excerpt":"We investigate the February 19, 2025, re-entry of a Falcon 9 upper stage using optical observations from 43 meteor cameras across central Europe together with radar detections of re-entry plasma obtained with the 32.55 MHz SIMONe Germany multistatic radar system. Optical observations of fragment emissions between 85 and 36 km altitude were used to reconstruct 30 fragment trajectories, identify two main fragment families, and fit ballistic trajectories to estimate kinetic energy loss per unit mass. The optical detection-height distribution peaks near 60 km with a standard deviation of 10 km, an"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2605.29124","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2605.29124/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-05-29T01:05:19Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5AyKCy88rxD73FYTzkxoKm+0eaa5Vh3fcwb67Ve0rYGsD0w3XkB5EpJdfiU8E+Dzly/Gz3dyUhp3psOc7T6UDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T20:22:38.894280Z"},"content_sha256":"0cabdfd1fc08eb1355e84d2e048cbdaab621e3f9d09520e0673d2cd87768d298","schema_version":"1.0","event_id":"sha256:0cabdfd1fc08eb1355e84d2e048cbdaab621e3f9d09520e0673d2cd87768d298"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/5RUGIVFIY2YJQQIBCBVOFSWPSV/bundle.json","state_url":"https://pith.science/pith/5RUGIVFIY2YJQQIBCBVOFSWPSV/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/5RUGIVFIY2YJQQIBCBVOFSWPSV/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":"2026-05-31T20:22:38Z","links":{"resolver":"https://pith.science/pith/5RUGIVFIY2YJQQIBCBVOFSWPSV","bundle":"https://pith.science/pith/5RUGIVFIY2YJQQIBCBVOFSWPSV/bundle.json","state":"https://pith.science/pith/5RUGIVFIY2YJQQIBCBVOFSWPSV/state.json","well_known_bundle":"https://pith.science/.well-known/pith/5RUGIVFIY2YJQQIBCBVOFSWPSV/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:5RUGIVFIY2YJQQIBCBVOFSWPSV","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":"c131a91904c5e2bda94ae03f595de2dbe49e16d6fd7951368d3e847d1a01182c","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.space-ph","submitted_at":"2026-05-27T21:35:27Z","title_canon_sha256":"50ab9ab4b271a67f2ec660d48e2ca524164bf4a15e8b20a2f3afecfbaa780163"},"schema_version":"1.0","source":{"id":"2605.29124","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2605.29124","created_at":"2026-05-29T01:05:19Z"},{"alias_kind":"arxiv_version","alias_value":"2605.29124v1","created_at":"2026-05-29T01:05:19Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2605.29124","created_at":"2026-05-29T01:05:19Z"},{"alias_kind":"pith_short_12","alias_value":"5RUGIVFIY2YJ","created_at":"2026-05-29T01:05:19Z"},{"alias_kind":"pith_short_16","alias_value":"5RUGIVFIY2YJQQIB","created_at":"2026-05-29T01:05:19Z"},{"alias_kind":"pith_short_8","alias_value":"5RUGIVFI","created_at":"2026-05-29T01:05:19Z"}],"graph_snapshots":[{"event_id":"sha256:0cabdfd1fc08eb1355e84d2e048cbdaab621e3f9d09520e0673d2cd87768d298","target":"graph","created_at":"2026-05-29T01:05:19Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2605.29124/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We investigate the February 19, 2025, re-entry of a Falcon 9 upper stage using optical observations from 43 meteor cameras across central Europe together with radar detections of re-entry plasma obtained with the 32.55 MHz SIMONe Germany multistatic radar system. Optical observations of fragment emissions between 85 and 36 km altitude were used to reconstruct 30 fragment trajectories, identify two main fragment families, and fit ballistic trajectories to estimate kinetic energy loss per unit mass. The optical detection-height distribution peaks near 60 km with a standard deviation of 10 km, an","authors_text":"Bj\\\"orn Gustavsson, Dabrowka Knach, Daniel Kastinen, Devin Huyghebaert, Gerd Baumgarten, Jorge L. Chau, Juha Vierinen, Kenneth S. Obenberger, Matthias Clahsen, Nico Pfeffer, Robin Wing, Toralf Renkwitz","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.space-ph","submitted_at":"2026-05-27T21:35:27Z","title":"Optical and Radar Observations of the February 2025 Falcon 9 Upper-Stage Re-entry"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2605.29124","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:d61fb3c46efbcc8d3005d45dde4799f2c0a3fb416b531b2642c22ae5dd8b9e91","target":"record","created_at":"2026-05-29T01:05:19Z","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":"c131a91904c5e2bda94ae03f595de2dbe49e16d6fd7951368d3e847d1a01182c","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.space-ph","submitted_at":"2026-05-27T21:35:27Z","title_canon_sha256":"50ab9ab4b271a67f2ec660d48e2ca524164bf4a15e8b20a2f3afecfbaa780163"},"schema_version":"1.0","source":{"id":"2605.29124","kind":"arxiv","version":1}},"canonical_sha256":"ec686454a8c6b0984101106ae2cacf9558da6cad28e559bee63a73c067dd072c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ec686454a8c6b0984101106ae2cacf9558da6cad28e559bee63a73c067dd072c","first_computed_at":"2026-05-29T01:05:19.546931Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-29T01:05:19.546931Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"7JY6DVh6sq5IKdHmBlBBdGm+v8mXnTqzWwzn4WlKVmDmqU9ToJwzcJ+GC3r33+HqKl44ZDXPqyjhC5p9smDcAA==","signature_status":"signed_v1","signed_at":"2026-05-29T01:05:19.547808Z","signed_message":"canonical_sha256_bytes"},"source_id":"2605.29124","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d61fb3c46efbcc8d3005d45dde4799f2c0a3fb416b531b2642c22ae5dd8b9e91","sha256:0cabdfd1fc08eb1355e84d2e048cbdaab621e3f9d09520e0673d2cd87768d298"],"state_sha256":"15fbdc61446913e06cd3a02f39abf3bd97aaa0e8906c7a8d7b3947a8855dfb64"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"c+r6WxeBKmctlDhbx9UCCtvf3hrP4GyppUmwt2mgwmJ+8qiFQ4zd03htuAdvGX6Zewl5WXONo80qqWXBML9wCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T20:22:38.898435Z","bundle_sha256":"914afa6a329582c62a25deb9408df7f774595dc973b50b92f01d22e62429e3aa"}}