{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:PCNFYHGYXBW56EK6QAR5DDBMPG","short_pith_number":"pith:PCNFYHGY","canonical_record":{"source":{"id":"1607.02147","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-07-07T20:00:05Z","cross_cats_sorted":[],"title_canon_sha256":"bbf887a892c36ebe7f69f0f2e26756031f003f8064759d6e270133f0bfbca60e","abstract_canon_sha256":"7f7158ad5bebfbf67e264a199be6d328b83ff22ce959c75020d49c3c3553105d"},"schema_version":"1.0"},"canonical_sha256":"789a5c1cd8b86ddf115e8023d18c2c79a9f71572bf4adbe736e8a7a4b30d6475","source":{"kind":"arxiv","id":"1607.02147","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1607.02147","created_at":"2026-05-18T01:08:38Z"},{"alias_kind":"arxiv_version","alias_value":"1607.02147v1","created_at":"2026-05-18T01:08:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1607.02147","created_at":"2026-05-18T01:08:38Z"},{"alias_kind":"pith_short_12","alias_value":"PCNFYHGYXBW5","created_at":"2026-05-18T12:30:39Z"},{"alias_kind":"pith_short_16","alias_value":"PCNFYHGYXBW56EK6","created_at":"2026-05-18T12:30:39Z"},{"alias_kind":"pith_short_8","alias_value":"PCNFYHGY","created_at":"2026-05-18T12:30:39Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:PCNFYHGYXBW56EK6QAR5DDBMPG","target":"record","payload":{"canonical_record":{"source":{"id":"1607.02147","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-07-07T20:00:05Z","cross_cats_sorted":[],"title_canon_sha256":"bbf887a892c36ebe7f69f0f2e26756031f003f8064759d6e270133f0bfbca60e","abstract_canon_sha256":"7f7158ad5bebfbf67e264a199be6d328b83ff22ce959c75020d49c3c3553105d"},"schema_version":"1.0"},"canonical_sha256":"789a5c1cd8b86ddf115e8023d18c2c79a9f71572bf4adbe736e8a7a4b30d6475","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:08:38.306787Z","signature_b64":"5tCTAwH28uBx0xJd+9kZ6VT0SxPd9chyf4bTmvtJfyMIEb18fH2R9vAIOnCzM3xTFDSYrXddWIoo33Y3VLBbDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"789a5c1cd8b86ddf115e8023d18c2c79a9f71572bf4adbe736e8a7a4b30d6475","last_reissued_at":"2026-05-18T01:08:38.306222Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:08:38.306222Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1607.02147","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":"2026-05-18T01:08:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Ggcsmcm+19MEPvOg1btiFGt20r7peuYrs9iGdiRfGw0V4gheDGIntdWvwUBIF6KuewGBMFfttrh14VpAT5aBDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T16:37:48.606807Z"},"content_sha256":"8e3eb908bce583204026df853a87d5037e579d4be1af93cd48902202534d0510","schema_version":"1.0","event_id":"sha256:8e3eb908bce583204026df853a87d5037e579d4be1af93cd48902202534d0510"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:PCNFYHGYXBW56EK6QAR5DDBMPG","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"On the Classification of UGC1382 as a Giant Low Surface Brightness Galaxy","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Alex Hagen, Barry F. Madore, James D. Neill, Jeffrey A. Rich, Kristina Nyland, Lea M. Z. Hagen, Lisa M. Young, Marie Treyer, Mark Seibert","submitted_at":"2016-07-07T20:00:05Z","abstract_excerpt":"We provide evidence that UGC1382, long believed to be a passive elliptical galaxy, is actually a giant low surface brightness (GLSB) galaxy which rivals the archetypical GLSB Malin 1 in size. Like other GLSB galaxies, it has two components: a high surface brightness disk galaxy surrounded by an extended low surface brightness (LSB) disk. For UGC1382, the central component is a lenticular system with an effective radius of 6 kpc. Beyond this, the LSB disk has an effective radius of ~38 kpc and an extrapolated central surface brightness of ~26 mag/arcsec^2. Both components have a combined stella"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1607.02147","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":"2026-05-18T01:08:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vOt/3Pr0moIYpL0hnFxMSljmldnG6EoTmhYJETUzI0NwYu/Lqity4EirkJ+/xu80RIo6MJsmpPgHWjODo/AbCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T16:37:48.607157Z"},"content_sha256":"66da6d8aa59199223f1bda02b4c5d5e4481c3d69ed57e0fd96405a0d61f9574b","schema_version":"1.0","event_id":"sha256:66da6d8aa59199223f1bda02b4c5d5e4481c3d69ed57e0fd96405a0d61f9574b"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/PCNFYHGYXBW56EK6QAR5DDBMPG/bundle.json","state_url":"https://pith.science/pith/PCNFYHGYXBW56EK6QAR5DDBMPG/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/PCNFYHGYXBW56EK6QAR5DDBMPG/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":"2026-06-03T16:37:48Z","links":{"resolver":"https://pith.science/pith/PCNFYHGYXBW56EK6QAR5DDBMPG","bundle":"https://pith.science/pith/PCNFYHGYXBW56EK6QAR5DDBMPG/bundle.json","state":"https://pith.science/pith/PCNFYHGYXBW56EK6QAR5DDBMPG/state.json","well_known_bundle":"https://pith.science/.well-known/pith/PCNFYHGYXBW56EK6QAR5DDBMPG/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:PCNFYHGYXBW56EK6QAR5DDBMPG","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":"7f7158ad5bebfbf67e264a199be6d328b83ff22ce959c75020d49c3c3553105d","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-07-07T20:00:05Z","title_canon_sha256":"bbf887a892c36ebe7f69f0f2e26756031f003f8064759d6e270133f0bfbca60e"},"schema_version":"1.0","source":{"id":"1607.02147","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1607.02147","created_at":"2026-05-18T01:08:38Z"},{"alias_kind":"arxiv_version","alias_value":"1607.02147v1","created_at":"2026-05-18T01:08:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1607.02147","created_at":"2026-05-18T01:08:38Z"},{"alias_kind":"pith_short_12","alias_value":"PCNFYHGYXBW5","created_at":"2026-05-18T12:30:39Z"},{"alias_kind":"pith_short_16","alias_value":"PCNFYHGYXBW56EK6","created_at":"2026-05-18T12:30:39Z"},{"alias_kind":"pith_short_8","alias_value":"PCNFYHGY","created_at":"2026-05-18T12:30:39Z"}],"graph_snapshots":[{"event_id":"sha256:66da6d8aa59199223f1bda02b4c5d5e4481c3d69ed57e0fd96405a0d61f9574b","target":"graph","created_at":"2026-05-18T01:08:38Z","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":"We provide evidence that UGC1382, long believed to be a passive elliptical galaxy, is actually a giant low surface brightness (GLSB) galaxy which rivals the archetypical GLSB Malin 1 in size. Like other GLSB galaxies, it has two components: a high surface brightness disk galaxy surrounded by an extended low surface brightness (LSB) disk. For UGC1382, the central component is a lenticular system with an effective radius of 6 kpc. Beyond this, the LSB disk has an effective radius of ~38 kpc and an extrapolated central surface brightness of ~26 mag/arcsec^2. Both components have a combined stella","authors_text":"Alex Hagen, Barry F. Madore, James D. Neill, Jeffrey A. Rich, Kristina Nyland, Lea M. Z. Hagen, Lisa M. Young, Marie Treyer, Mark Seibert","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-07-07T20:00:05Z","title":"On the Classification of UGC1382 as a Giant Low Surface Brightness Galaxy"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1607.02147","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":"sha256:8e3eb908bce583204026df853a87d5037e579d4be1af93cd48902202534d0510","target":"record","created_at":"2026-05-18T01:08:38Z","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":"7f7158ad5bebfbf67e264a199be6d328b83ff22ce959c75020d49c3c3553105d","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-07-07T20:00:05Z","title_canon_sha256":"bbf887a892c36ebe7f69f0f2e26756031f003f8064759d6e270133f0bfbca60e"},"schema_version":"1.0","source":{"id":"1607.02147","kind":"arxiv","version":1}},"canonical_sha256":"789a5c1cd8b86ddf115e8023d18c2c79a9f71572bf4adbe736e8a7a4b30d6475","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"789a5c1cd8b86ddf115e8023d18c2c79a9f71572bf4adbe736e8a7a4b30d6475","first_computed_at":"2026-05-18T01:08:38.306222Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:08:38.306222Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"5tCTAwH28uBx0xJd+9kZ6VT0SxPd9chyf4bTmvtJfyMIEb18fH2R9vAIOnCzM3xTFDSYrXddWIoo33Y3VLBbDA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:08:38.306787Z","signed_message":"canonical_sha256_bytes"},"source_id":"1607.02147","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8e3eb908bce583204026df853a87d5037e579d4be1af93cd48902202534d0510","sha256:66da6d8aa59199223f1bda02b4c5d5e4481c3d69ed57e0fd96405a0d61f9574b"],"state_sha256":"bf6503930566cdadea2407424bfaa5c5b74569f0ebee59d379dd7d0efddc558f"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"nV7+ZMOAOS1qGpgYLpvAY41kgsX8c276JksIAkBdzMItEFTgR7Jz7YYii30oqo6IcOrgLFmVqEIEWmmIE9X4AA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-03T16:37:48.609128Z","bundle_sha256":"e0aaa0b39e1c3bad778235ec49428dae50641bdbc4419b2c88f031f34553f363"}}