{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:W7R4IR5VRI3M3SDZPK6D3VZFWG","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":"8cd90f835b32fdbd7c00cd57f13879fef441aa6dbdd324f97185c188726429d8","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2009-06-16T13:00:44Z","title_canon_sha256":"cf7ba95574af105b823cd056092bc85ff35cd667fef8a9259d8da36673b7d6c9"},"schema_version":"1.0","source":{"id":"0906.2870","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0906.2870","created_at":"2026-05-18T02:13:19Z"},{"alias_kind":"arxiv_version","alias_value":"0906.2870v1","created_at":"2026-05-18T02:13:19Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0906.2870","created_at":"2026-05-18T02:13:19Z"},{"alias_kind":"pith_short_12","alias_value":"W7R4IR5VRI3M","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_16","alias_value":"W7R4IR5VRI3M3SDZ","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_8","alias_value":"W7R4IR5V","created_at":"2026-05-18T12:26:02Z"}],"graph_snapshots":[{"event_id":"sha256:f75cf3e31d693fd8cd3e8dcdd7fd55c8b068d8eb5789c5e66b92cf98f2aa8027","target":"graph","created_at":"2026-05-18T02:13:19Z","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"},"paper":{"abstract_excerpt":"We present a deep and wide field-of-view (4'x 7') image of the planetary nebula (PN) NGC 7293 (the Helix Nebula) in the 2.12 micron H2 v=1-0 S(1) line. The excellent seeing (0.4'') at the Subaru Telescope, allows the details of cometary knots to be examined. The knots are found at distances of 2.2'-6.4' from the central star (CS). At the inner edge and in the inner ring (up to 4.5' fromthe CS), the knot often show a `tadpole' shape, an elliptical head with a bright crescent inside and a long tail opposite to the CS. In detail, there are variations in the tadpole shapes, such as narrowing tails","authors_text":"A.A. Zijlstra (Manchester), A.K. Speck (Missouri), B.M. McHunu (Missouri), I. Tanaka (NAOJ), M.D. Smith (Kent), M. Matsuura (NAOJ, N.J. Wright (UCL), R. Wesson (UCL), S. Viti (UCL), UCL)","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2009-06-16T13:00:44Z","title":"Knots in the Helix Nebula found in H2"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0906.2870","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":"sha256:1d9bbbec6d994444d2ff01c4dc348a022aef9a2e0bf338210d526324ee2cc816","target":"record","created_at":"2026-05-18T02:13:19Z","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":"8cd90f835b32fdbd7c00cd57f13879fef441aa6dbdd324f97185c188726429d8","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2009-06-16T13:00:44Z","title_canon_sha256":"cf7ba95574af105b823cd056092bc85ff35cd667fef8a9259d8da36673b7d6c9"},"schema_version":"1.0","source":{"id":"0906.2870","kind":"arxiv","version":1}},"canonical_sha256":"b7e3c447b58a36cdc8797abc3dd725b18b35cd6822a83c743d78490f531ef0f2","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b7e3c447b58a36cdc8797abc3dd725b18b35cd6822a83c743d78490f531ef0f2","first_computed_at":"2026-05-18T02:13:19.810253Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:13:19.810253Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"aIM49yovq8AjIieU6K1Rk1/JvpC1ku51EGWQyOkPhxucaQNZJi+tyO6JoYnMp24hQydciU9bkPd7TPY8Z6JNAA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:13:19.810817Z","signed_message":"canonical_sha256_bytes"},"source_id":"0906.2870","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1d9bbbec6d994444d2ff01c4dc348a022aef9a2e0bf338210d526324ee2cc816","sha256:f75cf3e31d693fd8cd3e8dcdd7fd55c8b068d8eb5789c5e66b92cf98f2aa8027"],"state_sha256":"d2bfed6e128345df72a765a486179c2824ed35c6510d2a75d088130de1700b85"}