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We derived the physical parameters using detailed theoretical isochrone fittings using 2 minimization. The derived cluster parameters are E(B-V) = 0.24+/-0.05 and 0.03+/-0.04, (V-M_V)_0 = 12.25+/-0.12 and 12.47+/-0.08, age(Gyr) = 1.08+/-0.09 and 2.31+/-0.16, and [Fe/H]= -0.08+/-0.06 and -0.24+/-0.06, respectively for NGC 1245 and NGC 2506, We present the luminosity "},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1208.1080","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/publicdomain/","primary_cat":"astro-ph.GA","submitted_at":"2012-08-06T04:07:07Z","cross_cats_sorted":[],"title_canon_sha256":"d303da31f9ca5ae89ce6f1dc2fcfc1f62bb3d996a45e1cd8357386c6aed19522","abstract_canon_sha256":"3bf21210594341ed213ca56fe3c80548553c9b0dbed8416881af877b9cda8187"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:55:22.796854Z","signature_b64":"FkUCqblreETEPy+9FsZ7avT9DtuO2SlxB2QZQ3rwA4LnyZUvYoQwYlwv1proQ3gb6yGGVxdR993uSdTCS6iaDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"282739cbd9f4094a6dd356f5e4b9672fc05862d68c726b24faabfff4bbc9c498","last_reissued_at":"2026-05-18T01:55:22.796338Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:55:22.796338Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Deep and Wide Photometry of Two Open Clusters NGC 1245 and NGC 2506: CCD Observation and Physical Properties","license":"http://creativecommons.org/licenses/publicdomain/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"H. B. Ann, S. H. Lee, Y.-W. Kang","submitted_at":"2012-08-06T04:07:07Z","abstract_excerpt":"We have conducted VI CCD photometry of the two open clusters NGC 1245 and NGC 2506 using the CFH12K CCD camera. Our photometry covers a sky area of 84'X82' and 42'X81' for the two clusters, respectively, and reaches down to V = 23. We derived the physical parameters using detailed theoretical isochrone fittings using 2 minimization. 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