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From this, we estimate the absolute magnitude of ES Dra during our spectroscopic observations to have been MR = 6.5 \\pm 0.5, and its distance to be 720 \\pm 150 pc. The long-term light curve of ES Dra compiled by the American Association of Variable Star Observers (AAVSO) shows that ES Dra is a Z Cam star, whic"},"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":"1107.4175","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2011-07-21T06:13:31Z","cross_cats_sorted":[],"title_canon_sha256":"a60eff4dd85e53cea8279dfcc41ce77fd8fc801b324dc4f2abba2a80fc89be8d","abstract_canon_sha256":"b9449d99b9d7582bdaba10453be3ec4ec0792bcd31bf1d4c68f9fe2d121b8853"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:01:13.853627Z","signature_b64":"yTLHwBQib8iRVXaXRBAI4uHaVdhecXZmX6IobJySsmcGAz4J0Ns+ciaonLiMvuNfHnctaOwF7Xibn5Y373SmCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"de105b4c145f57a5015de3ccd9d3fa0d71db472c02c6e60715a0b12c58525af6","last_reissued_at":"2026-05-18T02:01:13.853070Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:01:13.853070Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"The Orbital Period and Variability of the Dwarf Nova ES Draconis","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"F. 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