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We compare the photometry and completeness of the 2dFGRS and the SDSS-EDR with the MGC. We have also undertaken a photometric comparison to SCOS and SDSS-DR1 data.\n  We find that $B_{MGC}-B_{2dF}=0.035$ mag with an uncertainty of 0.142 mag per galaxy, $B_{MGC}-B_{SCOS}=0.032$ mag with an uncertainty of 0.108 mag, $B_{MGC}-B_{SDSS-EDR}=0.032$ mag with an uncertainty of 0.094 mag, and $B_{MGC}-B_{"},"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":"astro-ph/0312317","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2003-12-11T23:15:42Z","cross_cats_sorted":[],"title_canon_sha256":"48446b1205bc7ebf07655ff54185b3f20d4a27680d5c5a305b0e6b37754e301b","abstract_canon_sha256":"f00ed38f835578dcb39c3a38243ab031dfe3175912d491c1d00a55401dcf36a1"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T16:37:59.033306Z","signature_b64":"nhPKelOEb56v8MgrsoweKbbo7VOxzohwXuHT/yPuM8zfMQEayMc3WlDz86zvSDNQ+EU4E3ciZY74YAuzriF4Cg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"9cd7f00d71d3b5fa45a7a8307ed9792fa826a4301cfc20417e1bcd85f47c9f46","last_reissued_at":"2026-07-04T16:37:59.032820Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T16:37:59.032820Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"The Millennium Galaxy Catalogue: The photometric accuracy, completeness and contamination of the 2dFGRS and SDSS-EDR & DR1 datasets","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"D. 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We have also undertaken a photometric comparison to SCOS and SDSS-DR1 data.\n  We find that $B_{MGC}-B_{2dF}=0.035$ mag with an uncertainty of 0.142 mag per galaxy, $B_{MGC}-B_{SCOS}=0.032$ mag with an uncertainty of 0.108 mag, $B_{MGC}-B_{SDSS-EDR}=0.032$ mag with an uncertainty of 0.094 mag, and $B_{MGC}-B_{"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0312317","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/astro-ph/0312317/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":"astro-ph/0312317","created_at":"2026-07-04T16:37:59.032882+00:00"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0312317v1","created_at":"2026-07-04T16:37:59.032882+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0312317","created_at":"2026-07-04T16:37:59.032882+00:00"},{"alias_kind":"pith_short_12","alias_value":"TTL7ADLR2O27","created_at":"2026-07-04T16:37:59.032882+00:00"},{"alias_kind":"pith_short_16","alias_value":"TTL7ADLR2O27URNH","created_at":"2026-07-04T16:37:59.032882+00:00"},{"alias_kind":"pith_short_8","alias_value":"TTL7ADLR","created_at":"2026-07-04T16:37:59.032882+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/TTL7ADLR2O27URNHVAYH5WLZF6","json":"https://pith.science/pith/TTL7ADLR2O27URNHVAYH5WLZF6.json","graph_json":"https://pith.science/api/pith-number/TTL7ADLR2O27URNHVAYH5WLZF6/graph.json","events_json":"https://pith.science/api/pith-number/TTL7ADLR2O27URNHVAYH5WLZF6/events.json","paper":"https://pith.science/paper/TTL7ADLR"},"agent_actions":{"view_html":"https://pith.science/pith/TTL7ADLR2O27URNHVAYH5WLZF6","download_json":"https://pith.science/pith/TTL7ADLR2O27URNHVAYH5WLZF6.json","view_paper":"https://pith.science/paper/TTL7ADLR","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=astro-ph/0312317&json=true","fetch_graph":"https://pith.science/api/pith-number/TTL7ADLR2O27URNHVAYH5WLZF6/graph.json","fetch_events":"https://pith.science/api/pith-number/TTL7ADLR2O27URNHVAYH5WLZF6/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/TTL7ADLR2O27URNHVAYH5WLZF6/action/timestamp_anchor","attest_storage":"https://pith.science/pith/TTL7ADLR2O27URNHVAYH5WLZF6/action/storage_attestation","attest_author":"https://pith.science/pith/TTL7ADLR2O27URNHVAYH5WLZF6/action/author_attestation","sign_citation":"https://pith.science/pith/TTL7ADLR2O27URNHVAYH5WLZF6/action/citation_signature","submit_replication":"https://pith.science/pith/TTL7ADLR2O27URNHVAYH5WLZF6/action/replication_record"}},"created_at":"2026-07-04T16:37:59.032882+00:00","updated_at":"2026-07-04T16:37:59.032882+00:00"}