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We use these data to determine the spectroscopic orbit and the photometric elements for V12. From our analysis we determine accurate masses (Mp=1.103+-0.007Msun, Ms=1.081+-0.007Msun) and radii (R =1.424+-0.019Rsun, Rs=1.373+-0.019Rsun) for the primary (p) and secondary (s) binary components. We adopt a reddening of E_(B-V)=0.087 for NGC188, and derive component effective temperatures of 5900+-100K and 5875+-100K, respectiv"},"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":"0903.3566","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2009-03-20T16:49:39Z","cross_cats_sorted":[],"title_canon_sha256":"2960fbeca7d10d88eb0ed6c0c7a1e9a3cb7c0bfba0ed9ad66010acdf3acbabf0","abstract_canon_sha256":"b5ae829f867bf2a6f003688e26df6cc3837e2fb8d94da0edad7b398a0f3be902"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:14:26.947830Z","signature_b64":"tOjFvO0+DldczhIqt4YUbEN/9AtLGZ2l0AKqkYCaZZcWPjoB1rEvEr5P0LPpseb7DZGcq7aVH1E/7XB0lCbbCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"90c72189561f31857054730139f26626532b261e65878ffaa21b24f03243c1ee","last_reissued_at":"2026-05-18T02:14:26.947172Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:14:26.947172Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Age and distance for the old open cluster NGC188 from the eclipsing binary member V12","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"A. 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