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The 5.24 hr binary orbital period was inferred from the X-ray and optical light curve modulation, implying a late K or M spectral type companion star.\n  The source entered a low state in 1983, during which the optical modulation disappeared and an F8 IV star was revealed, suggesting that 4U 2129+47 might be part of a triple system. The nature of 4U 2129+47 has since been investigated, but no definitive conclusion has been reached.\n  Here, we present timing "},"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":"0709.4366","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2007-09-27T11:46:38Z","cross_cats_sorted":[],"title_canon_sha256":"d25ec5134c6128f80d8f86f9e29cd8c54655bc03953c507d878970b58926e4aa","abstract_canon_sha256":"f09b45480d867ed8d26039925a6c3f11cc24bad64c147637280f5962cd0ee9db"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T17:05:54.297496Z","signature_b64":"80PTzqq+97Y4pZleIuIH/FnGDNxzaOsmyJf01GVXVtLy1cwGBkYLJJwBnUr7ZCHgNt7Yog/EZDI7HyNQjKVSCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"325aa716774ceeea7228866d68dfe199c941f7ec36657e0b156bf543f8b43c3b","last_reissued_at":"2026-07-04T17:05:54.297045Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T17:05:54.297045Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"X-Ray Eclipse Time Delays in 4U2129+47","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"A. 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