{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:NAPSKJOAKTT65NFKQFIESCFWWE","short_pith_number":"pith:NAPSKJOA","canonical_record":{"source":{"id":"1806.01461","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2018-06-05T01:50:25Z","cross_cats_sorted":[],"title_canon_sha256":"9ad6b8883be493caecc48f6795356e9e0010f63f712f6d31e3818df1194ca4c8","abstract_canon_sha256":"75ba694e837a7923b138d005d83dad25663b565ca2e7436991680dee294f94ba"},"schema_version":"1.0"},"canonical_sha256":"681f2525c054e7eeb4aa81504908b6b1082a367e9c5a94d81e58a1ea0c957033","source":{"kind":"arxiv","id":"1806.01461","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1806.01461","created_at":"2026-05-18T00:11:04Z"},{"alias_kind":"arxiv_version","alias_value":"1806.01461v1","created_at":"2026-05-18T00:11:04Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1806.01461","created_at":"2026-05-18T00:11:04Z"},{"alias_kind":"pith_short_12","alias_value":"NAPSKJOAKTT6","created_at":"2026-05-18T12:32:40Z"},{"alias_kind":"pith_short_16","alias_value":"NAPSKJOAKTT65NFK","created_at":"2026-05-18T12:32:40Z"},{"alias_kind":"pith_short_8","alias_value":"NAPSKJOA","created_at":"2026-05-18T12:32:40Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:NAPSKJOAKTT65NFKQFIESCFWWE","target":"record","payload":{"canonical_record":{"source":{"id":"1806.01461","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2018-06-05T01:50:25Z","cross_cats_sorted":[],"title_canon_sha256":"9ad6b8883be493caecc48f6795356e9e0010f63f712f6d31e3818df1194ca4c8","abstract_canon_sha256":"75ba694e837a7923b138d005d83dad25663b565ca2e7436991680dee294f94ba"},"schema_version":"1.0"},"canonical_sha256":"681f2525c054e7eeb4aa81504908b6b1082a367e9c5a94d81e58a1ea0c957033","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:11:04.613816Z","signature_b64":"fK6Nnc8jbUf5ioWSHgzcjJCJuPVyOrWFfVbumy4Xi9vWu8B9aKIequXDvqb6vSp6rGSPcjtveBe4pVx8+71rBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"681f2525c054e7eeb4aa81504908b6b1082a367e9c5a94d81e58a1ea0c957033","last_reissued_at":"2026-05-18T00:11:04.613110Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:11:04.613110Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1806.01461","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":"2026-05-18T00:11:04Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3XTsxFfnYpFVLF2boIcR3yMdYpySOCR77qMNJSm4A0vtnqpyEKjGzBXTJf0js58nXJ1k1xhxpTVIgq+XDeimAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-06T06:40:48.096771Z"},"content_sha256":"a304c283fe93823ecbf16e5431c8ace83d99fb7be8df33bcbc91d73d238faea7","schema_version":"1.0","event_id":"sha256:a304c283fe93823ecbf16e5431c8ace83d99fb7be8df33bcbc91d73d238faea7"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:NAPSKJOAKTT65NFKQFIESCFWWE","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Search for Dust Emission from (24) Themis Using the Gemini-North Telescope","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.EP","authors_text":"Alan Fitzsimmons, Henry H. Hsieh, Mark V. Sykes, Yoonyoung Kim","submitted_at":"2018-06-05T01:50:25Z","abstract_excerpt":"We report the results of a search for a dust trail aligned with the orbit plane of the large main-belt asteroid (24) Themis, which has been reported to have water ice frost on its surface. Observations were obtained with the GMOS instrument on the Gemini-North Observatory in imaging mode, where we used a chip gap to block much of the light from the asteroid, allowing us to take long exposures while avoiding saturation by the object. No dust trail is detected within 2' of Themis to a 3-sigma limiting surface brightness magnitude of 29.7 mag/arcsec^2, as measured along the expected direction of "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1806.01461","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":"2026-05-18T00:11:04Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"v6xz9ckZ8EKertRRXuXn73oM82oAoRUQ9BWBvLsiFVugYzGhnoytYAeZwPnPIlOLfZh0fNftSltcUjvazQ0NAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-06T06:40:48.097505Z"},"content_sha256":"56c0b8be598e0fa54b12b17b24a2ed5bc3b01cec581042507d1ed60bfde49f5c","schema_version":"1.0","event_id":"sha256:56c0b8be598e0fa54b12b17b24a2ed5bc3b01cec581042507d1ed60bfde49f5c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/NAPSKJOAKTT65NFKQFIESCFWWE/bundle.json","state_url":"https://pith.science/pith/NAPSKJOAKTT65NFKQFIESCFWWE/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/NAPSKJOAKTT65NFKQFIESCFWWE/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":"2026-06-06T06:40:48Z","links":{"resolver":"https://pith.science/pith/NAPSKJOAKTT65NFKQFIESCFWWE","bundle":"https://pith.science/pith/NAPSKJOAKTT65NFKQFIESCFWWE/bundle.json","state":"https://pith.science/pith/NAPSKJOAKTT65NFKQFIESCFWWE/state.json","well_known_bundle":"https://pith.science/.well-known/pith/NAPSKJOAKTT65NFKQFIESCFWWE/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:NAPSKJOAKTT65NFKQFIESCFWWE","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":"75ba694e837a7923b138d005d83dad25663b565ca2e7436991680dee294f94ba","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2018-06-05T01:50:25Z","title_canon_sha256":"9ad6b8883be493caecc48f6795356e9e0010f63f712f6d31e3818df1194ca4c8"},"schema_version":"1.0","source":{"id":"1806.01461","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1806.01461","created_at":"2026-05-18T00:11:04Z"},{"alias_kind":"arxiv_version","alias_value":"1806.01461v1","created_at":"2026-05-18T00:11:04Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1806.01461","created_at":"2026-05-18T00:11:04Z"},{"alias_kind":"pith_short_12","alias_value":"NAPSKJOAKTT6","created_at":"2026-05-18T12:32:40Z"},{"alias_kind":"pith_short_16","alias_value":"NAPSKJOAKTT65NFK","created_at":"2026-05-18T12:32:40Z"},{"alias_kind":"pith_short_8","alias_value":"NAPSKJOA","created_at":"2026-05-18T12:32:40Z"}],"graph_snapshots":[{"event_id":"sha256:56c0b8be598e0fa54b12b17b24a2ed5bc3b01cec581042507d1ed60bfde49f5c","target":"graph","created_at":"2026-05-18T00:11:04Z","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 the results of a search for a dust trail aligned with the orbit plane of the large main-belt asteroid (24) Themis, which has been reported to have water ice frost on its surface. Observations were obtained with the GMOS instrument on the Gemini-North Observatory in imaging mode, where we used a chip gap to block much of the light from the asteroid, allowing us to take long exposures while avoiding saturation by the object. No dust trail is detected within 2' of Themis to a 3-sigma limiting surface brightness magnitude of 29.7 mag/arcsec^2, as measured along the expected direction of ","authors_text":"Alan Fitzsimmons, Henry H. Hsieh, Mark V. Sykes, Yoonyoung Kim","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2018-06-05T01:50:25Z","title":"Search for Dust Emission from (24) Themis Using the Gemini-North Telescope"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1806.01461","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:a304c283fe93823ecbf16e5431c8ace83d99fb7be8df33bcbc91d73d238faea7","target":"record","created_at":"2026-05-18T00:11:04Z","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":"75ba694e837a7923b138d005d83dad25663b565ca2e7436991680dee294f94ba","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2018-06-05T01:50:25Z","title_canon_sha256":"9ad6b8883be493caecc48f6795356e9e0010f63f712f6d31e3818df1194ca4c8"},"schema_version":"1.0","source":{"id":"1806.01461","kind":"arxiv","version":1}},"canonical_sha256":"681f2525c054e7eeb4aa81504908b6b1082a367e9c5a94d81e58a1ea0c957033","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"681f2525c054e7eeb4aa81504908b6b1082a367e9c5a94d81e58a1ea0c957033","first_computed_at":"2026-05-18T00:11:04.613110Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:11:04.613110Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"fK6Nnc8jbUf5ioWSHgzcjJCJuPVyOrWFfVbumy4Xi9vWu8B9aKIequXDvqb6vSp6rGSPcjtveBe4pVx8+71rBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:11:04.613816Z","signed_message":"canonical_sha256_bytes"},"source_id":"1806.01461","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a304c283fe93823ecbf16e5431c8ace83d99fb7be8df33bcbc91d73d238faea7","sha256:56c0b8be598e0fa54b12b17b24a2ed5bc3b01cec581042507d1ed60bfde49f5c"],"state_sha256":"4951c320e68593dfe37ec966485255a877e036925bf914c86e354825872d38b6"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dWBwQMCv32ZjwB98laKz+c4+N4w8Qk1lj0ij1wTbaiJUt4EsfyDHPU/IOcoVtucslwjGPKX/4nQ2J8g9kx/zAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-06T06:40:48.101405Z","bundle_sha256":"b315c23d4302425c860ba77c9fdb1739c12bf4e22ddf2022f867bd3a4810cbc7"}}