{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2021:SMTORCKTUYR54VX73BN6JHC5C2","short_pith_number":"pith:SMTORCKT","schema_version":"1.0","canonical_sha256":"9326e88953a623de56ffd85be49c5d16afdd8bb341e39807ceae430152668d63","source":{"kind":"arxiv","id":"2104.03319","version":2},"attestation_state":"computed","paper":{"title":"A Tip of the Red Giant Branch Distance of $22.1 \\pm 1.2$ Mpc to the Dark Matter Deficient Galaxy NGC1052-DF2 from 40 Orbits of Hubble Space Telescope Imaging","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Aaron J. Romanowsky, Andrew E. Dolphin, Charlie Conroy, Dhruba Dutta Chowdhury, Jean P. Brodie, J. M. Diederik Kruijssen, Pieter van Dokkum, Roberto Abraham, Shany Danieli, Zili Shen","submitted_at":"2021-04-07T18:00:02Z","abstract_excerpt":"The large and diffuse galaxies NGC1052-DF2 and NGC1052-DF4 have been found to have very low dark matter content and a population of luminous globular clusters. Accurate distance measurements are key to interpreting these observations. Recently, the distance to NGC1052-DF4 was found to be $20.0\\pm 1.6$ Mpc by identifying the tip of the red giant branch (TRGB) in 12 orbits of Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS) imaging. Here we present 40 orbits of HST ACS data for NGC1052-DF2 and use these data to measure its TRGB. The TRGB is readily apparent in the color-magnitude d"},"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":"2104.03319","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2021-04-07T18:00:02Z","cross_cats_sorted":[],"title_canon_sha256":"401603c037586373e2f33e9f6a9beddf479fa3589012c346d33d864f65c69749","abstract_canon_sha256":"cb9efae5f28cc55aa4011db9042fcabc6b7b6c1c42326ef9a1fda53b8af7e085"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T02:51:22.272044Z","signature_b64":"4DUJqB2ibCllZHW6QTtdR5VPcyWhsIE1N1IyMNmPv23mluftcdOiNDrsG6bApkfaUbDTfRA4bMC9Oyt9wfsuCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"9326e88953a623de56ffd85be49c5d16afdd8bb341e39807ceae430152668d63","last_reissued_at":"2026-07-05T02:51:22.271558Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T02:51:22.271558Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"A Tip of the Red Giant Branch Distance of $22.1 \\pm 1.2$ Mpc to the Dark Matter Deficient Galaxy NGC1052-DF2 from 40 Orbits of Hubble Space Telescope Imaging","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Aaron J. Romanowsky, Andrew E. Dolphin, Charlie Conroy, Dhruba Dutta Chowdhury, Jean P. Brodie, J. M. Diederik Kruijssen, Pieter van Dokkum, Roberto Abraham, Shany Danieli, Zili Shen","submitted_at":"2021-04-07T18:00:02Z","abstract_excerpt":"The large and diffuse galaxies NGC1052-DF2 and NGC1052-DF4 have been found to have very low dark matter content and a population of luminous globular clusters. Accurate distance measurements are key to interpreting these observations. Recently, the distance to NGC1052-DF4 was found to be $20.0\\pm 1.6$ Mpc by identifying the tip of the red giant branch (TRGB) in 12 orbits of Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS) imaging. Here we present 40 orbits of HST ACS data for NGC1052-DF2 and use these data to measure its TRGB. The TRGB is readily apparent in the color-magnitude d"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2104.03319","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2104.03319/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":"2104.03319","created_at":"2026-07-05T02:51:22.271613+00:00"},{"alias_kind":"arxiv_version","alias_value":"2104.03319v2","created_at":"2026-07-05T02:51:22.271613+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2104.03319","created_at":"2026-07-05T02:51:22.271613+00:00"},{"alias_kind":"pith_short_12","alias_value":"SMTORCKTUYR5","created_at":"2026-07-05T02:51:22.271613+00:00"},{"alias_kind":"pith_short_16","alias_value":"SMTORCKTUYR54VX7","created_at":"2026-07-05T02:51:22.271613+00:00"},{"alias_kind":"pith_short_8","alias_value":"SMTORCKT","created_at":"2026-07-05T02:51:22.271613+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/SMTORCKTUYR54VX73BN6JHC5C2","json":"https://pith.science/pith/SMTORCKTUYR54VX73BN6JHC5C2.json","graph_json":"https://pith.science/api/pith-number/SMTORCKTUYR54VX73BN6JHC5C2/graph.json","events_json":"https://pith.science/api/pith-number/SMTORCKTUYR54VX73BN6JHC5C2/events.json","paper":"https://pith.science/paper/SMTORCKT"},"agent_actions":{"view_html":"https://pith.science/pith/SMTORCKTUYR54VX73BN6JHC5C2","download_json":"https://pith.science/pith/SMTORCKTUYR54VX73BN6JHC5C2.json","view_paper":"https://pith.science/paper/SMTORCKT","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2104.03319&json=true","fetch_graph":"https://pith.science/api/pith-number/SMTORCKTUYR54VX73BN6JHC5C2/graph.json","fetch_events":"https://pith.science/api/pith-number/SMTORCKTUYR54VX73BN6JHC5C2/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/SMTORCKTUYR54VX73BN6JHC5C2/action/timestamp_anchor","attest_storage":"https://pith.science/pith/SMTORCKTUYR54VX73BN6JHC5C2/action/storage_attestation","attest_author":"https://pith.science/pith/SMTORCKTUYR54VX73BN6JHC5C2/action/author_attestation","sign_citation":"https://pith.science/pith/SMTORCKTUYR54VX73BN6JHC5C2/action/citation_signature","submit_replication":"https://pith.science/pith/SMTORCKTUYR54VX73BN6JHC5C2/action/replication_record"}},"created_at":"2026-07-05T02:51:22.271613+00:00","updated_at":"2026-07-05T02:51:22.271613+00:00"}