{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:4SZIZSE456IUGSC62GPMT2TJ42","short_pith_number":"pith:4SZIZSE4","canonical_record":{"source":{"id":"0902.4571","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2009-02-26T12:46:07Z","cross_cats_sorted":[],"title_canon_sha256":"abe826046f58dd05394b1169ff179967b40994543bb2aad7e41026ccc8f48a41","abstract_canon_sha256":"4b7e07ed0cdbd937c821369f7ecc394c88db4ef13b1f37929a0e5cd17ae1c61f"},"schema_version":"1.0"},"canonical_sha256":"e4b28cc89cef9143485ed19ec9ea69e6b96013b9f2b3f3650e0c840bbd2bd36a","source":{"kind":"arxiv","id":"0902.4571","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0902.4571","created_at":"2026-05-18T02:14:38Z"},{"alias_kind":"arxiv_version","alias_value":"0902.4571v1","created_at":"2026-05-18T02:14:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0902.4571","created_at":"2026-05-18T02:14:38Z"},{"alias_kind":"pith_short_12","alias_value":"4SZIZSE456IU","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"4SZIZSE456IUGSC6","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"4SZIZSE4","created_at":"2026-05-18T12:25:58Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:4SZIZSE456IUGSC62GPMT2TJ42","target":"record","payload":{"canonical_record":{"source":{"id":"0902.4571","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2009-02-26T12:46:07Z","cross_cats_sorted":[],"title_canon_sha256":"abe826046f58dd05394b1169ff179967b40994543bb2aad7e41026ccc8f48a41","abstract_canon_sha256":"4b7e07ed0cdbd937c821369f7ecc394c88db4ef13b1f37929a0e5cd17ae1c61f"},"schema_version":"1.0"},"canonical_sha256":"e4b28cc89cef9143485ed19ec9ea69e6b96013b9f2b3f3650e0c840bbd2bd36a","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:14:38.653787Z","signature_b64":"M0vn0+9oNyJPCDLfzFdYfHI8QGpuH9L7RMGwaSUsMA9PFBvdQVvzZCL4jgevEtOOu7+rPTIaUsyMqLbfxoqSDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e4b28cc89cef9143485ed19ec9ea69e6b96013b9f2b3f3650e0c840bbd2bd36a","last_reissued_at":"2026-05-18T02:14:38.652968Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:14:38.652968Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0902.4571","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":"2026-05-18T02:14:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"VGzWs+G/S3GjDG6SSytBXV1EXVGBylO5u+NWVMnhKFXBg1mDJ43jt89rPXJ7+nmtwk8Dn8MxWQhqJLcOaarfCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T16:24:27.301681Z"},"content_sha256":"15d13dcc96227674d0b40b96437f0fdf79f57afc3eb5e958d0a7d6d7848d7ea1","schema_version":"1.0","event_id":"sha256:15d13dcc96227674d0b40b96437f0fdf79f57afc3eb5e958d0a7d6d7848d7ea1"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:4SZIZSE456IUGSC62GPMT2TJ42","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A deep multi-band investigation of IC2391","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"B. Merin, D. Barrado y Navascues, E. Distefano, E. Young, G. Leto, G. Marino, I. Pagano, L. Spezzi, N. Siegler, S. Messina, Z. Balog","submitted_at":"2009-02-26T12:46:07Z","abstract_excerpt":"We report the outcome of a deep multi-wavelength study of the IC2391 young open cluster. We aim at uncovering new low-mass and sub-stellar members of the cluster and identifying new debris disk objects. A 30*30 square arcmin area in IC 2391 was observed using the wide-field imager at the ESO 2.2m telescope. The completeness limits of the photometry at 3 sigma level are V=24.7, Rc=23.7 and Ic=23.0, faint enough to reveal sub-stellar members down to about 0.03 solar masses. Our membership criteria are based on the use of our optical data, in combination with JHKs magnitudes from the 2MASS catalo"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0902.4571","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":"2026-05-18T02:14:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"PsQTMyeHUm9m/UfU9hN9vxxNDgfwonCqvCsX6dyHoShm0s7Tc/UQGcLCsGvMMf23Ol+taDO16stpEGytmqnUDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T16:24:27.302105Z"},"content_sha256":"9ff93d20e801854ded6454b11a9c016e429ee46bc6bb11eaddf118b1f5ed5634","schema_version":"1.0","event_id":"sha256:9ff93d20e801854ded6454b11a9c016e429ee46bc6bb11eaddf118b1f5ed5634"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/4SZIZSE456IUGSC62GPMT2TJ42/bundle.json","state_url":"https://pith.science/pith/4SZIZSE456IUGSC62GPMT2TJ42/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/4SZIZSE456IUGSC62GPMT2TJ42/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":"2026-05-25T16:24:27Z","links":{"resolver":"https://pith.science/pith/4SZIZSE456IUGSC62GPMT2TJ42","bundle":"https://pith.science/pith/4SZIZSE456IUGSC62GPMT2TJ42/bundle.json","state":"https://pith.science/pith/4SZIZSE456IUGSC62GPMT2TJ42/state.json","well_known_bundle":"https://pith.science/.well-known/pith/4SZIZSE456IUGSC62GPMT2TJ42/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:4SZIZSE456IUGSC62GPMT2TJ42","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":"4b7e07ed0cdbd937c821369f7ecc394c88db4ef13b1f37929a0e5cd17ae1c61f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2009-02-26T12:46:07Z","title_canon_sha256":"abe826046f58dd05394b1169ff179967b40994543bb2aad7e41026ccc8f48a41"},"schema_version":"1.0","source":{"id":"0902.4571","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0902.4571","created_at":"2026-05-18T02:14:38Z"},{"alias_kind":"arxiv_version","alias_value":"0902.4571v1","created_at":"2026-05-18T02:14:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0902.4571","created_at":"2026-05-18T02:14:38Z"},{"alias_kind":"pith_short_12","alias_value":"4SZIZSE456IU","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"4SZIZSE456IUGSC6","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"4SZIZSE4","created_at":"2026-05-18T12:25:58Z"}],"graph_snapshots":[{"event_id":"sha256:9ff93d20e801854ded6454b11a9c016e429ee46bc6bb11eaddf118b1f5ed5634","target":"graph","created_at":"2026-05-18T02:14:38Z","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 report the outcome of a deep multi-wavelength study of the IC2391 young open cluster. We aim at uncovering new low-mass and sub-stellar members of the cluster and identifying new debris disk objects. A 30*30 square arcmin area in IC 2391 was observed using the wide-field imager at the ESO 2.2m telescope. The completeness limits of the photometry at 3 sigma level are V=24.7, Rc=23.7 and Ic=23.0, faint enough to reveal sub-stellar members down to about 0.03 solar masses. Our membership criteria are based on the use of our optical data, in combination with JHKs magnitudes from the 2MASS catalo","authors_text":"B. Merin, D. Barrado y Navascues, E. Distefano, E. Young, G. Leto, G. Marino, I. Pagano, L. Spezzi, N. Siegler, S. Messina, Z. Balog","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2009-02-26T12:46:07Z","title":"A deep multi-band investigation of IC2391"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0902.4571","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":"sha256:15d13dcc96227674d0b40b96437f0fdf79f57afc3eb5e958d0a7d6d7848d7ea1","target":"record","created_at":"2026-05-18T02:14:38Z","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":"4b7e07ed0cdbd937c821369f7ecc394c88db4ef13b1f37929a0e5cd17ae1c61f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2009-02-26T12:46:07Z","title_canon_sha256":"abe826046f58dd05394b1169ff179967b40994543bb2aad7e41026ccc8f48a41"},"schema_version":"1.0","source":{"id":"0902.4571","kind":"arxiv","version":1}},"canonical_sha256":"e4b28cc89cef9143485ed19ec9ea69e6b96013b9f2b3f3650e0c840bbd2bd36a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e4b28cc89cef9143485ed19ec9ea69e6b96013b9f2b3f3650e0c840bbd2bd36a","first_computed_at":"2026-05-18T02:14:38.652968Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:14:38.652968Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"M0vn0+9oNyJPCDLfzFdYfHI8QGpuH9L7RMGwaSUsMA9PFBvdQVvzZCL4jgevEtOOu7+rPTIaUsyMqLbfxoqSDg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:14:38.653787Z","signed_message":"canonical_sha256_bytes"},"source_id":"0902.4571","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:15d13dcc96227674d0b40b96437f0fdf79f57afc3eb5e958d0a7d6d7848d7ea1","sha256:9ff93d20e801854ded6454b11a9c016e429ee46bc6bb11eaddf118b1f5ed5634"],"state_sha256":"8c28d9f17f6cf29fe15a0a7d90cef6af60645a7ddd91bf8213eb61c2ba14e8a5"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rQLo8TKpSunaP8idhZeVBb2yicjjtIMb8h8bp3xsEOGP4oQV5V/NcWAGQKLFUlkpsXBTMT/bKs1YaL5sFjekBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T16:24:27.305174Z","bundle_sha256":"983d5d96e81b9f4356ce6af48dd37fb33f657d508bd3af3498ec8a7f7de291eb"}}