{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:7TMQYT2XIF3MUYTNB7ESJPFA3Q","short_pith_number":"pith:7TMQYT2X","canonical_record":{"source":{"id":"1807.08753","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-07-23T18:00:00Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"ad4a7f4336ef06ea02d939b17cc81ae183ab39f1af7ede1f7349acffc2cd756a","abstract_canon_sha256":"7616201e00a663de228dd63ef13009b1982d0d823ff76b6e0232ad2b231bdf98"},"schema_version":"1.0"},"canonical_sha256":"fcd90c4f574176ca626d0fc924bca0dc123eb4c4e53c82a0b10bbbe56c72df3d","source":{"kind":"arxiv","id":"1807.08753","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1807.08753","created_at":"2026-05-18T00:06:37Z"},{"alias_kind":"arxiv_version","alias_value":"1807.08753v1","created_at":"2026-05-18T00:06:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1807.08753","created_at":"2026-05-18T00:06:37Z"},{"alias_kind":"pith_short_12","alias_value":"7TMQYT2XIF3M","created_at":"2026-05-18T12:32:11Z"},{"alias_kind":"pith_short_16","alias_value":"7TMQYT2XIF3MUYTN","created_at":"2026-05-18T12:32:11Z"},{"alias_kind":"pith_short_8","alias_value":"7TMQYT2X","created_at":"2026-05-18T12:32:11Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:7TMQYT2XIF3MUYTNB7ESJPFA3Q","target":"record","payload":{"canonical_record":{"source":{"id":"1807.08753","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-07-23T18:00:00Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"ad4a7f4336ef06ea02d939b17cc81ae183ab39f1af7ede1f7349acffc2cd756a","abstract_canon_sha256":"7616201e00a663de228dd63ef13009b1982d0d823ff76b6e0232ad2b231bdf98"},"schema_version":"1.0"},"canonical_sha256":"fcd90c4f574176ca626d0fc924bca0dc123eb4c4e53c82a0b10bbbe56c72df3d","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:06:37.363443Z","signature_b64":"hBY1KpR79sP2DJOluOEmYpu6qCeFM5/eZWnQRGjFEMgh5UMN31RpIJbEfn4HTimqQo4LNBmW+wqeFGSRx1bbCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"fcd90c4f574176ca626d0fc924bca0dc123eb4c4e53c82a0b10bbbe56c72df3d","last_reissued_at":"2026-05-18T00:06:37.362961Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:06:37.362961Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1807.08753","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":"2026-05-18T00:06:37Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"uCjaRS1jdXnoUW6V10cL+Dyf6YM4MkUj3+YZYwhynz6QebirAgYWPv906ujlXE5sz56K9157WPQncK1PxkX5Cg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T10:02:11.778775Z"},"content_sha256":"1215c6eb7f035fa5572946a8828aea196b54e7a8e5b6f8d50be3ea5f71422c39","schema_version":"1.0","event_id":"sha256:1215c6eb7f035fa5572946a8828aea196b54e7a8e5b6f8d50be3ea5f71422c39"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:7TMQYT2XIF3MUYTNB7ESJPFA3Q","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"M31 PAndromeda Cepheid sample observed in four HST bands","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.GA","authors_text":"Arno Riffeser, Claus Goessl, Jan Snigula, Johannes Koppenhoefer, Mihael Kodric, Ralf Bender, Stella Seitz, Ulrich Hopp","submitted_at":"2018-07-23T18:00:00Z","abstract_excerpt":"Using the M31 PAndromeda Cepheid sample and the HST PHAT data we obtain the largest Cepheid sample in M31 with HST data in four bands. For our analysis we consider three samples: A very homogeneous sample of Cepheids based on the PAndromeda data, the mean magnitude corrected PAndromeda sample and a sample complementing the PAndromeda sample with Cepheids from literature. The latter results in the largest catalog with 522 fundamental mode (FM) Cepheids and 102 first overtone (FO) Cepheids with F160W and F110W data and 559 FM Cepheids and 111 FO Cepheids with F814W and F475W data. The obtained d"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1807.08753","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":"2026-05-18T00:06:37Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"csnugf8DKCZhscDlvw5UG5TRXSjAXofAGPJ7G49hLFqKjn0r5VVi7b5caQT2YNEy7kqK/q3+XwKocUI7qSexBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T10:02:11.779126Z"},"content_sha256":"020e0c477d378f536e18ab3a8a7f841434abf00f91c406d7195b110a3191f6cd","schema_version":"1.0","event_id":"sha256:020e0c477d378f536e18ab3a8a7f841434abf00f91c406d7195b110a3191f6cd"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/7TMQYT2XIF3MUYTNB7ESJPFA3Q/bundle.json","state_url":"https://pith.science/pith/7TMQYT2XIF3MUYTNB7ESJPFA3Q/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/7TMQYT2XIF3MUYTNB7ESJPFA3Q/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":"2026-06-04T10:02:11Z","links":{"resolver":"https://pith.science/pith/7TMQYT2XIF3MUYTNB7ESJPFA3Q","bundle":"https://pith.science/pith/7TMQYT2XIF3MUYTNB7ESJPFA3Q/bundle.json","state":"https://pith.science/pith/7TMQYT2XIF3MUYTNB7ESJPFA3Q/state.json","well_known_bundle":"https://pith.science/.well-known/pith/7TMQYT2XIF3MUYTNB7ESJPFA3Q/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:7TMQYT2XIF3MUYTNB7ESJPFA3Q","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":"7616201e00a663de228dd63ef13009b1982d0d823ff76b6e0232ad2b231bdf98","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-07-23T18:00:00Z","title_canon_sha256":"ad4a7f4336ef06ea02d939b17cc81ae183ab39f1af7ede1f7349acffc2cd756a"},"schema_version":"1.0","source":{"id":"1807.08753","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1807.08753","created_at":"2026-05-18T00:06:37Z"},{"alias_kind":"arxiv_version","alias_value":"1807.08753v1","created_at":"2026-05-18T00:06:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1807.08753","created_at":"2026-05-18T00:06:37Z"},{"alias_kind":"pith_short_12","alias_value":"7TMQYT2XIF3M","created_at":"2026-05-18T12:32:11Z"},{"alias_kind":"pith_short_16","alias_value":"7TMQYT2XIF3MUYTN","created_at":"2026-05-18T12:32:11Z"},{"alias_kind":"pith_short_8","alias_value":"7TMQYT2X","created_at":"2026-05-18T12:32:11Z"}],"graph_snapshots":[{"event_id":"sha256:020e0c477d378f536e18ab3a8a7f841434abf00f91c406d7195b110a3191f6cd","target":"graph","created_at":"2026-05-18T00:06:37Z","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":"Using the M31 PAndromeda Cepheid sample and the HST PHAT data we obtain the largest Cepheid sample in M31 with HST data in four bands. For our analysis we consider three samples: A very homogeneous sample of Cepheids based on the PAndromeda data, the mean magnitude corrected PAndromeda sample and a sample complementing the PAndromeda sample with Cepheids from literature. The latter results in the largest catalog with 522 fundamental mode (FM) Cepheids and 102 first overtone (FO) Cepheids with F160W and F110W data and 559 FM Cepheids and 111 FO Cepheids with F814W and F475W data. The obtained d","authors_text":"Arno Riffeser, Claus Goessl, Jan Snigula, Johannes Koppenhoefer, Mihael Kodric, Ralf Bender, Stella Seitz, Ulrich Hopp","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-07-23T18:00:00Z","title":"M31 PAndromeda Cepheid sample observed in four HST bands"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1807.08753","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":"sha256:1215c6eb7f035fa5572946a8828aea196b54e7a8e5b6f8d50be3ea5f71422c39","target":"record","created_at":"2026-05-18T00:06:37Z","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":"7616201e00a663de228dd63ef13009b1982d0d823ff76b6e0232ad2b231bdf98","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-07-23T18:00:00Z","title_canon_sha256":"ad4a7f4336ef06ea02d939b17cc81ae183ab39f1af7ede1f7349acffc2cd756a"},"schema_version":"1.0","source":{"id":"1807.08753","kind":"arxiv","version":1}},"canonical_sha256":"fcd90c4f574176ca626d0fc924bca0dc123eb4c4e53c82a0b10bbbe56c72df3d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"fcd90c4f574176ca626d0fc924bca0dc123eb4c4e53c82a0b10bbbe56c72df3d","first_computed_at":"2026-05-18T00:06:37.362961Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:06:37.362961Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"hBY1KpR79sP2DJOluOEmYpu6qCeFM5/eZWnQRGjFEMgh5UMN31RpIJbEfn4HTimqQo4LNBmW+wqeFGSRx1bbCg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:06:37.363443Z","signed_message":"canonical_sha256_bytes"},"source_id":"1807.08753","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1215c6eb7f035fa5572946a8828aea196b54e7a8e5b6f8d50be3ea5f71422c39","sha256:020e0c477d378f536e18ab3a8a7f841434abf00f91c406d7195b110a3191f6cd"],"state_sha256":"eab3fa2b1e0d8b55e9056ab735e488022ee4dc2d7c61a5a5999f38b765376f62"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"LtuAKP/Fbe33vUaSOCFpJkEoUYRWw+z1IMPo8DYdQfgvYATed3BipwNtxPLFAVneuf3vwJLE1v2t/NiD4IVrBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-04T10:02:11.781049Z","bundle_sha256":"578c54cabbc86e1849c31b24da85516e2ff86cf246d4f5ba37d8a73fa960187e"}}