{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:S5APBDNNGP77PH7P6SDNROVZ4L","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":"6cd54b2cdd5047c81a8c27a7b70fd0195d2f2684917ba0e332b339f6fb4e1b83","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-10-06T17:08:12Z","title_canon_sha256":"b4366a0a383f67256b589fb053b423c7b4d0c169321ba14ea6e0f08dc05261a0"},"schema_version":"1.0","source":{"id":"1610.01951","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1610.01951","created_at":"2026-05-18T00:55:40Z"},{"alias_kind":"arxiv_version","alias_value":"1610.01951v1","created_at":"2026-05-18T00:55:40Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1610.01951","created_at":"2026-05-18T00:55:40Z"},{"alias_kind":"pith_short_12","alias_value":"S5APBDNNGP77","created_at":"2026-05-18T12:30:41Z"},{"alias_kind":"pith_short_16","alias_value":"S5APBDNNGP77PH7P","created_at":"2026-05-18T12:30:41Z"},{"alias_kind":"pith_short_8","alias_value":"S5APBDNN","created_at":"2026-05-18T12:30:41Z"}],"graph_snapshots":[{"event_id":"sha256:d10d56555b98f62f610e36639c5e658786becb4d00785d66be4695ac97d7eaa6","target":"graph","created_at":"2026-05-18T00:55:40Z","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 have analyzed four epochs of H$\\alpha$ and [S~II] HST images of the HH~1/2 outflow (covering a time interval from 1994 to 2014) to determine proper motions and emission line fluxes of the knots of HH~2. We find that our new proper motions agree surprisingly well with the motions measured by Herbig \\& Jones (1981), although there is partial evidence for a slight deceleration of the motion of the HH~2 knots from 1945 to 2014. We also measure the time-variability of the H$\\alpha$ intensities and the [S~II]/H$\\alpha$ line ratios, and find that knots H and A have the largest intensity variabilit","authors_text":"A. C. Raga, A. Esquivel, B. Reipurth, J. Bally, P. F. Vel\\'azquez","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-10-06T17:08:12Z","title":"The time evolution of HH~2 from four epochs of HST images"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1610.01951","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":"sha256:0fd42861bf068b9a91ffb0a26ed97dcbaa60f0193b360a021d8278ba26fe5dd5","target":"record","created_at":"2026-05-18T00:55:40Z","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":"6cd54b2cdd5047c81a8c27a7b70fd0195d2f2684917ba0e332b339f6fb4e1b83","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-10-06T17:08:12Z","title_canon_sha256":"b4366a0a383f67256b589fb053b423c7b4d0c169321ba14ea6e0f08dc05261a0"},"schema_version":"1.0","source":{"id":"1610.01951","kind":"arxiv","version":1}},"canonical_sha256":"9740f08dad33fff79feff486d8bab9e2eb3ed6f40f0e5d33c7431566bf9713b2","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"9740f08dad33fff79feff486d8bab9e2eb3ed6f40f0e5d33c7431566bf9713b2","first_computed_at":"2026-05-18T00:55:40.975886Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:55:40.975886Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"zEkV/RTwxa5nZR6oS05c5C/EMKmHKCRRov/gi7q/ZGgKCVUax27YxPnA7tbNLkJBEMfGfsEklOWtEhSXzcdMDA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:55:40.976353Z","signed_message":"canonical_sha256_bytes"},"source_id":"1610.01951","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0fd42861bf068b9a91ffb0a26ed97dcbaa60f0193b360a021d8278ba26fe5dd5","sha256:d10d56555b98f62f610e36639c5e658786becb4d00785d66be4695ac97d7eaa6"],"state_sha256":"f481fc844fd78cb33fe7979d74d5aee30c9eb2eab8280453053d3687eb979878"}