{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2021:GVVATAWPKA74YVJK6NRPMPYH3K","short_pith_number":"pith:GVVATAWP","schema_version":"1.0","canonical_sha256":"356a0982cf503fcc552af362f63f07daa249c2b005e0b8bdacf84f3511b6014d","source":{"kind":"arxiv","id":"2109.12494","version":1},"attestation_state":"computed","paper":{"title":"Plaskett 1.8 metre Observations of Starlink Satellites","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"Aaron C. Boley, Dave Balam, Ewan Wright, Paul Hickson, Samantha Lawler","submitted_at":"2021-09-26T05:08:28Z","abstract_excerpt":"We present observations of 23 Starlink satellites in the $g'$ bandpass, obtained from the Dominion Astrophysical Observatory's Plaskett 1.8 metre telescope. The targets include a mixture of satellites with and without brightness mitigation measures (i.e., visors). At the time of the observations (16 July 2021), Starlink satellites were sunlight throughout the night, and even with strict elevation and azimuth limits, there were over 800 candidate Starlink arcs. The satellites altogether have a median absolute brightness (550 km) of $\\overline{H}_g^{550} =5.3$ mag. Dividing the targets into thos"},"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":"2109.12494","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2021-09-26T05:08:28Z","cross_cats_sorted":[],"title_canon_sha256":"a6627cebb14ec6654da92c506e23eb2499648da4255760a54ba67340a02f5217","abstract_canon_sha256":"5449781a74fc108e7cb0064f3d9c39e3ff67ce1942fcec4d5de28e1e86782509"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T04:14:18.351184Z","signature_b64":"Mb+eFZ9fQ4bd9hQfdUvjBLkFF9gbqhUEWN2tCK7lC1Sk8vOJ9R/FLxHBgFKdVliBTdSfiIwkaO4rhgmIjWHiBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"356a0982cf503fcc552af362f63f07daa249c2b005e0b8bdacf84f3511b6014d","last_reissued_at":"2026-07-05T04:14:18.350632Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T04:14:18.350632Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Plaskett 1.8 metre Observations of Starlink Satellites","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"Aaron C. Boley, Dave Balam, Ewan Wright, Paul Hickson, Samantha Lawler","submitted_at":"2021-09-26T05:08:28Z","abstract_excerpt":"We present observations of 23 Starlink satellites in the $g'$ bandpass, obtained from the Dominion Astrophysical Observatory's Plaskett 1.8 metre telescope. The targets include a mixture of satellites with and without brightness mitigation measures (i.e., visors). At the time of the observations (16 July 2021), Starlink satellites were sunlight throughout the night, and even with strict elevation and azimuth limits, there were over 800 candidate Starlink arcs. The satellites altogether have a median absolute brightness (550 km) of $\\overline{H}_g^{550} =5.3$ mag. Dividing the targets into thos"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2109.12494","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/2109.12494/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"},"aliases":[{"alias_kind":"arxiv","alias_value":"2109.12494","created_at":"2026-07-05T04:14:18.350688+00:00"},{"alias_kind":"arxiv_version","alias_value":"2109.12494v1","created_at":"2026-07-05T04:14:18.350688+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2109.12494","created_at":"2026-07-05T04:14:18.350688+00:00"},{"alias_kind":"pith_short_12","alias_value":"GVVATAWPKA74","created_at":"2026-07-05T04:14:18.350688+00:00"},{"alias_kind":"pith_short_16","alias_value":"GVVATAWPKA74YVJK","created_at":"2026-07-05T04:14:18.350688+00:00"},{"alias_kind":"pith_short_8","alias_value":"GVVATAWP","created_at":"2026-07-05T04:14:18.350688+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":1,"internal_anchor_count":1,"sample":[{"citing_arxiv_id":"2608.02757","citing_title":"Rings in the Sky: Orbital Data Centres and Potential Impacts to Astronomy and the Sky","ref_index":29,"is_internal_anchor":true}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/GVVATAWPKA74YVJK6NRPMPYH3K","json":"https://pith.science/pith/GVVATAWPKA74YVJK6NRPMPYH3K.json","graph_json":"https://pith.science/api/pith-number/GVVATAWPKA74YVJK6NRPMPYH3K/graph.json","events_json":"https://pith.science/api/pith-number/GVVATAWPKA74YVJK6NRPMPYH3K/events.json","paper":"https://pith.science/paper/GVVATAWP"},"agent_actions":{"view_html":"https://pith.science/pith/GVVATAWPKA74YVJK6NRPMPYH3K","download_json":"https://pith.science/pith/GVVATAWPKA74YVJK6NRPMPYH3K.json","view_paper":"https://pith.science/paper/GVVATAWP","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2109.12494&json=true","fetch_graph":"https://pith.science/api/pith-number/GVVATAWPKA74YVJK6NRPMPYH3K/graph.json","fetch_events":"https://pith.science/api/pith-number/GVVATAWPKA74YVJK6NRPMPYH3K/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/GVVATAWPKA74YVJK6NRPMPYH3K/action/timestamp_anchor","attest_storage":"https://pith.science/pith/GVVATAWPKA74YVJK6NRPMPYH3K/action/storage_attestation","attest_author":"https://pith.science/pith/GVVATAWPKA74YVJK6NRPMPYH3K/action/author_attestation","sign_citation":"https://pith.science/pith/GVVATAWPKA74YVJK6NRPMPYH3K/action/citation_signature","submit_replication":"https://pith.science/pith/GVVATAWPKA74YVJK6NRPMPYH3K/action/replication_record"}},"created_at":"2026-07-05T04:14:18.350688+00:00","updated_at":"2026-07-05T04:14:18.350688+00:00"}