{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:JC66JWOFRQDMXINYOM7VILYRYD","short_pith_number":"pith:JC66JWOF","canonical_record":{"source":{"id":"1501.05311","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-01-21T21:00:13Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"ba9c1fc87ac75e2f0b71e3bc61568e9a39d79a74d03536ce565ff77c343adf52","abstract_canon_sha256":"ebb5a1d3bc3c71643ce2665fac2a81836902cdd2bac31a92d04092c52530c6dc"},"schema_version":"1.0"},"canonical_sha256":"48bde4d9c58c06cba1b8733f542f11c0fa174a4bd62279b699adbee7e155a0ff","source":{"kind":"arxiv","id":"1501.05311","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1501.05311","created_at":"2026-05-18T01:41:09Z"},{"alias_kind":"arxiv_version","alias_value":"1501.05311v1","created_at":"2026-05-18T01:41:09Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1501.05311","created_at":"2026-05-18T01:41:09Z"},{"alias_kind":"pith_short_12","alias_value":"JC66JWOFRQDM","created_at":"2026-05-18T12:29:27Z"},{"alias_kind":"pith_short_16","alias_value":"JC66JWOFRQDMXINY","created_at":"2026-05-18T12:29:27Z"},{"alias_kind":"pith_short_8","alias_value":"JC66JWOF","created_at":"2026-05-18T12:29:27Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:JC66JWOFRQDMXINYOM7VILYRYD","target":"record","payload":{"canonical_record":{"source":{"id":"1501.05311","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-01-21T21:00:13Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"ba9c1fc87ac75e2f0b71e3bc61568e9a39d79a74d03536ce565ff77c343adf52","abstract_canon_sha256":"ebb5a1d3bc3c71643ce2665fac2a81836902cdd2bac31a92d04092c52530c6dc"},"schema_version":"1.0"},"canonical_sha256":"48bde4d9c58c06cba1b8733f542f11c0fa174a4bd62279b699adbee7e155a0ff","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:41:09.501210Z","signature_b64":"LlQYjG7WlLomqKmzXwfXRX86VcPv1Nv+ixAkeMwA+whi07RtkrKmyLFSioUzoMOXjjMaaiJ5vticf8d4uyBZBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"48bde4d9c58c06cba1b8733f542f11c0fa174a4bd62279b699adbee7e155a0ff","last_reissued_at":"2026-05-18T01:41:09.500628Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:41:09.500628Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1501.05311","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":"2026-05-18T01:41:09Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"OV7qHEGa/0WxP8R/a65+LgY4wo+J7E1mAz/wYm5E3MjAA/N6yY4YNLfsGHJaJ+LyqPtfAFc20XMrCeJyptg/Dw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-26T23:31:35.057074Z"},"content_sha256":"7ef1ce9c5e69f83cfa5bf64dbf5347b397b0cab9a198f614eb76e8bf8cf48de6","schema_version":"1.0","event_id":"sha256:7ef1ce9c5e69f83cfa5bf64dbf5347b397b0cab9a198f614eb76e8bf8cf48de6"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:JC66JWOFRQDMXINYOM7VILYRYD","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Uncertainties in The Interstellar Extinction Curve and the Cepheid Distance to M101","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.GA","authors_text":"David M. Nataf","submitted_at":"2015-01-21T21:00:13Z","abstract_excerpt":"I revisit the Cepheid-distance determination to the nearby spiral galaxy M101 (Pinwheel Galaxy) of Shappee & Stanek (2011), in light of several recent investigations questioning the shape of the interstellar extinction curve at $\\lambda \\approx 8,000$ \\AA (i.e. I-band). I find that the relatively steep extinction ratio $A_{I}/E(V-I)=1.1450$ (Fitzpatrick & Massa 2007) is slightly favoured relative to $A_{I}/E(V-I)=1.2899$ (Fitzpatrick 1999) and significantly favoured relative the historically canonical value of $A_{I}/E(V-I)=1.4695$ (Cardelli et al. 1989). The steeper extinction curves, with lo"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1501.05311","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":"2026-05-18T01:41:09Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"p92MQ9YXQnNC3Orl3vy3W3gvXaJvbhF0IuMWo27oB4lUimn9a5xfVJOsbgX4/U94LIJ8dJzkw9oqYckWDNaICA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-26T23:31:35.057433Z"},"content_sha256":"3774123f02a20e59a64ffe64397c49f78dfd0adcf0b8cdb8f31cb848e5e2afab","schema_version":"1.0","event_id":"sha256:3774123f02a20e59a64ffe64397c49f78dfd0adcf0b8cdb8f31cb848e5e2afab"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/JC66JWOFRQDMXINYOM7VILYRYD/bundle.json","state_url":"https://pith.science/pith/JC66JWOFRQDMXINYOM7VILYRYD/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/JC66JWOFRQDMXINYOM7VILYRYD/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":"2026-06-26T23:31:35Z","links":{"resolver":"https://pith.science/pith/JC66JWOFRQDMXINYOM7VILYRYD","bundle":"https://pith.science/pith/JC66JWOFRQDMXINYOM7VILYRYD/bundle.json","state":"https://pith.science/pith/JC66JWOFRQDMXINYOM7VILYRYD/state.json","well_known_bundle":"https://pith.science/.well-known/pith/JC66JWOFRQDMXINYOM7VILYRYD/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:JC66JWOFRQDMXINYOM7VILYRYD","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":"ebb5a1d3bc3c71643ce2665fac2a81836902cdd2bac31a92d04092c52530c6dc","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-01-21T21:00:13Z","title_canon_sha256":"ba9c1fc87ac75e2f0b71e3bc61568e9a39d79a74d03536ce565ff77c343adf52"},"schema_version":"1.0","source":{"id":"1501.05311","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1501.05311","created_at":"2026-05-18T01:41:09Z"},{"alias_kind":"arxiv_version","alias_value":"1501.05311v1","created_at":"2026-05-18T01:41:09Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1501.05311","created_at":"2026-05-18T01:41:09Z"},{"alias_kind":"pith_short_12","alias_value":"JC66JWOFRQDM","created_at":"2026-05-18T12:29:27Z"},{"alias_kind":"pith_short_16","alias_value":"JC66JWOFRQDMXINY","created_at":"2026-05-18T12:29:27Z"},{"alias_kind":"pith_short_8","alias_value":"JC66JWOF","created_at":"2026-05-18T12:29:27Z"}],"graph_snapshots":[{"event_id":"sha256:3774123f02a20e59a64ffe64397c49f78dfd0adcf0b8cdb8f31cb848e5e2afab","target":"graph","created_at":"2026-05-18T01:41:09Z","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":"I revisit the Cepheid-distance determination to the nearby spiral galaxy M101 (Pinwheel Galaxy) of Shappee & Stanek (2011), in light of several recent investigations questioning the shape of the interstellar extinction curve at $\\lambda \\approx 8,000$ \\AA (i.e. I-band). I find that the relatively steep extinction ratio $A_{I}/E(V-I)=1.1450$ (Fitzpatrick & Massa 2007) is slightly favoured relative to $A_{I}/E(V-I)=1.2899$ (Fitzpatrick 1999) and significantly favoured relative the historically canonical value of $A_{I}/E(V-I)=1.4695$ (Cardelli et al. 1989). The steeper extinction curves, with lo","authors_text":"David M. Nataf","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-01-21T21:00:13Z","title":"Uncertainties in The Interstellar Extinction Curve and the Cepheid Distance to M101"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1501.05311","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":"sha256:7ef1ce9c5e69f83cfa5bf64dbf5347b397b0cab9a198f614eb76e8bf8cf48de6","target":"record","created_at":"2026-05-18T01:41:09Z","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":"ebb5a1d3bc3c71643ce2665fac2a81836902cdd2bac31a92d04092c52530c6dc","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-01-21T21:00:13Z","title_canon_sha256":"ba9c1fc87ac75e2f0b71e3bc61568e9a39d79a74d03536ce565ff77c343adf52"},"schema_version":"1.0","source":{"id":"1501.05311","kind":"arxiv","version":1}},"canonical_sha256":"48bde4d9c58c06cba1b8733f542f11c0fa174a4bd62279b699adbee7e155a0ff","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"48bde4d9c58c06cba1b8733f542f11c0fa174a4bd62279b699adbee7e155a0ff","first_computed_at":"2026-05-18T01:41:09.500628Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:41:09.500628Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"LlQYjG7WlLomqKmzXwfXRX86VcPv1Nv+ixAkeMwA+whi07RtkrKmyLFSioUzoMOXjjMaaiJ5vticf8d4uyBZBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:41:09.501210Z","signed_message":"canonical_sha256_bytes"},"source_id":"1501.05311","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7ef1ce9c5e69f83cfa5bf64dbf5347b397b0cab9a198f614eb76e8bf8cf48de6","sha256:3774123f02a20e59a64ffe64397c49f78dfd0adcf0b8cdb8f31cb848e5e2afab"],"state_sha256":"31d7b225154921c20468f76c3f4ed9a7d6d2a2476bf2b1dd3b80325efe8101c8"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8gcs9egu5N1onBNs1lqv9t729nwHZcJ8FMV8Cc/GpZImEsMLetl8i4D/6TOM/Kr00JQWMDHdIcqaI6uo/EE1Cw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-26T23:31:35.059327Z","bundle_sha256":"3af0fd55f02e76eab9373ed4a0515b6210002dff1c721ce440433dd4e926dc4e"}}