{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:QVBCRWEKF2IDB3LUVY34GHMG7C","short_pith_number":"pith:QVBCRWEK","canonical_record":{"source":{"id":"1910.08852","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-10-19T22:24:44Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"e63739662ddff5914ce65c0e5a34b43d8744e7b5e8de042d18a9644252e23808","abstract_canon_sha256":"f600f1ca469bfc7f49ef64b386448e402f03890270d8816fd8e139b00c0f19cd"},"schema_version":"1.0"},"canonical_sha256":"854228d88a2e9030ed74ae37c31d86f8906c653d9369750283349d21bd9441c7","source":{"kind":"arxiv","id":"1910.08852","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1910.08852","created_at":"2026-07-05T00:30:29Z"},{"alias_kind":"arxiv_version","alias_value":"1910.08852v1","created_at":"2026-07-05T00:30:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1910.08852","created_at":"2026-07-05T00:30:29Z"},{"alias_kind":"pith_short_12","alias_value":"QVBCRWEKF2ID","created_at":"2026-07-05T00:30:29Z"},{"alias_kind":"pith_short_16","alias_value":"QVBCRWEKF2IDB3LU","created_at":"2026-07-05T00:30:29Z"},{"alias_kind":"pith_short_8","alias_value":"QVBCRWEK","created_at":"2026-07-05T00:30:29Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:QVBCRWEKF2IDB3LUVY34GHMG7C","target":"record","payload":{"canonical_record":{"source":{"id":"1910.08852","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-10-19T22:24:44Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"e63739662ddff5914ce65c0e5a34b43d8744e7b5e8de042d18a9644252e23808","abstract_canon_sha256":"f600f1ca469bfc7f49ef64b386448e402f03890270d8816fd8e139b00c0f19cd"},"schema_version":"1.0"},"canonical_sha256":"854228d88a2e9030ed74ae37c31d86f8906c653d9369750283349d21bd9441c7","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:30:29.535105Z","signature_b64":"3Qjdk2MOXjZ8CvZx6WYZG/SABE+RWHR3PIXI4AoKv332xoTt31hE5U6KQqjpYbOXHF3YksNmwhrEpTIm1zlEDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"854228d88a2e9030ed74ae37c31d86f8906c653d9369750283349d21bd9441c7","last_reissued_at":"2026-07-05T00:30:29.534716Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:30:29.534716Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1910.08852","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":"2026-07-05T00:30:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"yp8Ln3rFLJy6EdwM8HcDOe7h/bLJt4Su62TY2GZHLUNsM0HfYm17a53DkegAdWvqmo+0h0e1+omb/Osbqg4nDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-06T05:28:22.349219Z"},"content_sha256":"8288b31b749ed1bdca97a20ff1939860e92f323a812eadf561413c6431e03782","schema_version":"1.0","event_id":"sha256:8288b31b749ed1bdca97a20ff1939860e92f323a812eadf561413c6431e03782"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:QVBCRWEKF2IDB3LUVY34GHMG7C","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"An Analysis of the Shapes of Interstellar Extinction Curves. VII. Milky Way Spectrophotometric Optical-through-Ultraviolet Extinction and Its R-Dependence","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.SR"],"primary_cat":"astro-ph.GA","authors_text":"Derck Massa, Edward L. Fitzpatrick, Geoffrey C. Clayton, Karl D. Gordon, Ralph Bohlin","submitted_at":"2019-10-19T22:24:44Z","abstract_excerpt":"We produce a set of 72 NIR through UV extinction curves by combining new HST/STIS optical spectrophotometry with existing IUE spectrophotometry (yielding gapless coverage from 1150 to 10000 Angstroms) and NIR photometry. These curves are used to determine a new, internally consistent, NIR through UV Milky Way Mean Curve and to characterize how the shapes of the extinction curves depend on R(V). We emphasize that while this dependence captures much of the curve variability, there remains considerable variation which is independent of R(V). We use the optical spectrophotometry to verify the pres"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1910.08852","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/1910.08852/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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T00:30:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"HRctpIfVTrWXtXjWG+nrpVdmiEONisdTNdhTlZfCDkc1GTYZ5kHLfxqFfwxkFQ9Hmw4BoNW5XRDZHztBuxcmAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-06T05:28:22.350158Z"},"content_sha256":"1e5f700af59adf99ca69c8a95356aaf9b34d27c795b7b6e2237eaff6f91cd4e9","schema_version":"1.0","event_id":"sha256:1e5f700af59adf99ca69c8a95356aaf9b34d27c795b7b6e2237eaff6f91cd4e9"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/QVBCRWEKF2IDB3LUVY34GHMG7C/bundle.json","state_url":"https://pith.science/pith/QVBCRWEKF2IDB3LUVY34GHMG7C/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/QVBCRWEKF2IDB3LUVY34GHMG7C/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":"2026-08-06T05:28:22Z","links":{"resolver":"https://pith.science/pith/QVBCRWEKF2IDB3LUVY34GHMG7C","bundle":"https://pith.science/pith/QVBCRWEKF2IDB3LUVY34GHMG7C/bundle.json","state":"https://pith.science/pith/QVBCRWEKF2IDB3LUVY34GHMG7C/state.json","well_known_bundle":"https://pith.science/.well-known/pith/QVBCRWEKF2IDB3LUVY34GHMG7C/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:QVBCRWEKF2IDB3LUVY34GHMG7C","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":"f600f1ca469bfc7f49ef64b386448e402f03890270d8816fd8e139b00c0f19cd","cross_cats_sorted":["astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-10-19T22:24:44Z","title_canon_sha256":"e63739662ddff5914ce65c0e5a34b43d8744e7b5e8de042d18a9644252e23808"},"schema_version":"1.0","source":{"id":"1910.08852","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1910.08852","created_at":"2026-07-05T00:30:29Z"},{"alias_kind":"arxiv_version","alias_value":"1910.08852v1","created_at":"2026-07-05T00:30:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1910.08852","created_at":"2026-07-05T00:30:29Z"},{"alias_kind":"pith_short_12","alias_value":"QVBCRWEKF2ID","created_at":"2026-07-05T00:30:29Z"},{"alias_kind":"pith_short_16","alias_value":"QVBCRWEKF2IDB3LU","created_at":"2026-07-05T00:30:29Z"},{"alias_kind":"pith_short_8","alias_value":"QVBCRWEK","created_at":"2026-07-05T00:30:29Z"}],"graph_snapshots":[{"event_id":"sha256:1e5f700af59adf99ca69c8a95356aaf9b34d27c795b7b6e2237eaff6f91cd4e9","target":"graph","created_at":"2026-07-05T00:30:29Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/1910.08852/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We produce a set of 72 NIR through UV extinction curves by combining new HST/STIS optical spectrophotometry with existing IUE spectrophotometry (yielding gapless coverage from 1150 to 10000 Angstroms) and NIR photometry. These curves are used to determine a new, internally consistent, NIR through UV Milky Way Mean Curve and to characterize how the shapes of the extinction curves depend on R(V). We emphasize that while this dependence captures much of the curve variability, there remains considerable variation which is independent of R(V). We use the optical spectrophotometry to verify the pres","authors_text":"Derck Massa, Edward L. Fitzpatrick, Geoffrey C. Clayton, Karl D. Gordon, Ralph Bohlin","cross_cats":["astro-ph.SR"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-10-19T22:24:44Z","title":"An Analysis of the Shapes of Interstellar Extinction Curves. VII. Milky Way Spectrophotometric Optical-through-Ultraviolet Extinction and Its R-Dependence"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1910.08852","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":"sha256:8288b31b749ed1bdca97a20ff1939860e92f323a812eadf561413c6431e03782","target":"record","created_at":"2026-07-05T00:30:29Z","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":"f600f1ca469bfc7f49ef64b386448e402f03890270d8816fd8e139b00c0f19cd","cross_cats_sorted":["astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-10-19T22:24:44Z","title_canon_sha256":"e63739662ddff5914ce65c0e5a34b43d8744e7b5e8de042d18a9644252e23808"},"schema_version":"1.0","source":{"id":"1910.08852","kind":"arxiv","version":1}},"canonical_sha256":"854228d88a2e9030ed74ae37c31d86f8906c653d9369750283349d21bd9441c7","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"854228d88a2e9030ed74ae37c31d86f8906c653d9369750283349d21bd9441c7","first_computed_at":"2026-07-05T00:30:29.534716Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T00:30:29.534716Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"3Qjdk2MOXjZ8CvZx6WYZG/SABE+RWHR3PIXI4AoKv332xoTt31hE5U6KQqjpYbOXHF3YksNmwhrEpTIm1zlEDg==","signature_status":"signed_v1","signed_at":"2026-07-05T00:30:29.535105Z","signed_message":"canonical_sha256_bytes"},"source_id":"1910.08852","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8288b31b749ed1bdca97a20ff1939860e92f323a812eadf561413c6431e03782","sha256:1e5f700af59adf99ca69c8a95356aaf9b34d27c795b7b6e2237eaff6f91cd4e9"],"state_sha256":"d1392673ec7cc29bca130c4e363dc2fbb2fe110789ed88df29e9dac9cd1f0904"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"71xfrSwojTwQKpoekI35dmvcK+ls8icnWoFkcMjaWz+znu/JOZXuQAY/k9orK+C996e5vbpAi9L0Gxp9vVZfAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-06T05:28:22.377480Z","bundle_sha256":"2781120cd9a6bbdf517de94bddeb3fed604ed5d337dc5712a6b7ad024ddc7691"}}