{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2018:PSUAW3XBK53FVPLFJ2GC3QS25B","short_pith_number":"pith:PSUAW3XB","schema_version":"1.0","canonical_sha256":"7ca80b6ee157765abd654e8c2dc25ae85e166b0a70722b876faf6f4017588e50","source":{"kind":"arxiv","id":"1806.01154","version":2},"attestation_state":"computed","paper":{"title":"The methane distribution and polar brightening on Uranus based on HST/STIS, Keck/NIRC2, and IRTF/SpeX observations through 2015","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.EP","authors_text":"Erich Karkoschka, Heidi B. Hammel, Imke de Pater, Lawrence A. Sromovsky, Patrick M. Fry","submitted_at":"2018-06-04T15:01:18Z","abstract_excerpt":"HST/STIS observations of Uranus in 2015 show that the depletion of upper tropospheric methane has been relatively stable and that the polar region has been brightening over time as a result of increased aerosol scattering. This interpretation is confirmed by near-IR imaging from HST and from the Keck telescope using NIRC2 adaptive optics imaging. Our analysis of the 2015 spectra, as well as prior spectra from 2012, shows that there is a factor of three decrease in the effective upper tropospheric methane mixing ratio between 30\\deg N and 70\\deg N. The absolute value of the deep methane mixing "},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1806.01154","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2018-06-04T15:01:18Z","cross_cats_sorted":[],"title_canon_sha256":"6b6cdeae238818415c7840ed65b159bc0496cbf02dcb84b99ef6a3c475dc5a44","abstract_canon_sha256":"04c8f54b549aa592f65fb92d3a73346a85f06be3c74eb47ec8021f6289fa2f8c"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:07:06.880850Z","signature_b64":"gQYWQRdcFc5bCdZwaqkn6J9vATOi3TpOKW7eALkHxKkgZV91OXPXvgFesLK2b9ankMerk2Pge448d3vExIiPCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7ca80b6ee157765abd654e8c2dc25ae85e166b0a70722b876faf6f4017588e50","last_reissued_at":"2026-05-18T00:07:06.880075Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:07:06.880075Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"The methane distribution and polar brightening on Uranus based on HST/STIS, Keck/NIRC2, and IRTF/SpeX observations through 2015","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.EP","authors_text":"Erich Karkoschka, Heidi B. Hammel, Imke de Pater, Lawrence A. Sromovsky, Patrick M. Fry","submitted_at":"2018-06-04T15:01:18Z","abstract_excerpt":"HST/STIS observations of Uranus in 2015 show that the depletion of upper tropospheric methane has been relatively stable and that the polar region has been brightening over time as a result of increased aerosol scattering. This interpretation is confirmed by near-IR imaging from HST and from the Keck telescope using NIRC2 adaptive optics imaging. Our analysis of the 2015 spectra, as well as prior spectra from 2012, shows that there is a factor of three decrease in the effective upper tropospheric methane mixing ratio between 30\\deg N and 70\\deg N. The absolute value of the deep methane mixing "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1806.01154","kind":"arxiv","version":2},"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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1806.01154","created_at":"2026-05-18T00:07:06.880201+00:00"},{"alias_kind":"arxiv_version","alias_value":"1806.01154v2","created_at":"2026-05-18T00:07:06.880201+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1806.01154","created_at":"2026-05-18T00:07:06.880201+00:00"},{"alias_kind":"pith_short_12","alias_value":"PSUAW3XBK53F","created_at":"2026-05-18T12:32:46.962924+00:00"},{"alias_kind":"pith_short_16","alias_value":"PSUAW3XBK53FVPLF","created_at":"2026-05-18T12:32:46.962924+00:00"},{"alias_kind":"pith_short_8","alias_value":"PSUAW3XB","created_at":"2026-05-18T12:32:46.962924+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":1,"internal_anchor_count":1,"sample":[{"citing_arxiv_id":"2608.13157","citing_title":"The atmospheric vertical structure of Uranus and Neptune from thermochemical models: the impact of model assumptions","ref_index":40,"is_internal_anchor":true}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/PSUAW3XBK53FVPLFJ2GC3QS25B","json":"https://pith.science/pith/PSUAW3XBK53FVPLFJ2GC3QS25B.json","graph_json":"https://pith.science/api/pith-number/PSUAW3XBK53FVPLFJ2GC3QS25B/graph.json","events_json":"https://pith.science/api/pith-number/PSUAW3XBK53FVPLFJ2GC3QS25B/events.json","paper":"https://pith.science/paper/PSUAW3XB"},"agent_actions":{"view_html":"https://pith.science/pith/PSUAW3XBK53FVPLFJ2GC3QS25B","download_json":"https://pith.science/pith/PSUAW3XBK53FVPLFJ2GC3QS25B.json","view_paper":"https://pith.science/paper/PSUAW3XB","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1806.01154&json=true","fetch_graph":"https://pith.science/api/pith-number/PSUAW3XBK53FVPLFJ2GC3QS25B/graph.json","fetch_events":"https://pith.science/api/pith-number/PSUAW3XBK53FVPLFJ2GC3QS25B/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/PSUAW3XBK53FVPLFJ2GC3QS25B/action/timestamp_anchor","attest_storage":"https://pith.science/pith/PSUAW3XBK53FVPLFJ2GC3QS25B/action/storage_attestation","attest_author":"https://pith.science/pith/PSUAW3XBK53FVPLFJ2GC3QS25B/action/author_attestation","sign_citation":"https://pith.science/pith/PSUAW3XBK53FVPLFJ2GC3QS25B/action/citation_signature","submit_replication":"https://pith.science/pith/PSUAW3XBK53FVPLFJ2GC3QS25B/action/replication_record"}},"created_at":"2026-05-18T00:07:06.880201+00:00","updated_at":"2026-05-18T00:07:06.880201+00:00"}