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For 4U1954+319 using high-resolution spectra we measure the equivalent widths of diffuse interstellar bands and estimate the interstellar reddening E(B-V)=0.83 +/- 0.09. Using GAIA distances and our photometry, we find (1) absolute V band magnitude of 4U1954+319 M_V=-5.23 +/- 0.08 and that the mass donor is a supergiant of luminosity class Ib, and (2) for ZZ CMi M_V=-0.27 +/- 0.2 and that the mass donor is a giant of luminosity class III."},"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":"2402.14378","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2024-02-22T08:46:04Z","cross_cats_sorted":[],"title_canon_sha256":"ec0a392d3b2610dff3e65871e9f4c263236809008ebeed35a6ae4611ca2c76bb","abstract_canon_sha256":"eedb3628d35f9ff7c263a1a2eaf2f5a28ab8b374beee576867e28da3a89ee8d7"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T07:48:09.351358Z","signature_b64":"G8UKWCqMGGFMjHyVoavhH3yBNFUTZ6EqOEB2qxW8fQL7fapB1XYB9pT3qAEFEK1LogjHdrsSNmKfQBASr30GDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"361d3850d54c14ea39a383b13c0ca8b043fb69c81cef24556e2fbb9547133f6c","last_reissued_at":"2026-07-05T07:48:09.350866Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T07:48:09.350866Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Luminosity class of the symbiotic stars 4U1954+319 and ZZ CMi","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"A. 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