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Its quiescent spectrum is unusually rich in helium, showing broad, double-peaked emission lines from the accretion disc. We measure a line flux ratio HeI 5875/Halpha = 0.81 +/- 0.04, a much higher ratio than typically observed in cataclysmic variables (CVs). The outburst spectrum shows hydrogen and helium in absorption, with weak emission of Halpha and HeI 6678, as well as strong HeII emission.\n  From our photometry, we find the superhump period to be 56.34 +/- 0.18 minutes,"},"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":"1301.6761","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2013-01-28T21:00:07Z","cross_cats_sorted":[],"title_canon_sha256":"c6596f6a2910af63cf4a2c6c5d3f3a3bbcd16c632ad9f816f25c4e8352929a30","abstract_canon_sha256":"cfa5c2e9a871bfade707aa820ed0e52bad62f7e6ea58e0aa71dd3250ec274ec8"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:51:57.743787Z","signature_b64":"PcqblV8iYoIKu++DsITZHjNyx6jahEMGboRjbF3/xR3E1NOD8uiFu+CRD5eJpOiWzcQiVT2r8M9hEN6lnhRHDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2d3cee545ac04680bad18478dbfeb708918eb21fdc447c2d6935c4c778502418","last_reissued_at":"2026-05-18T01:51:57.743224Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:51:57.743224Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"The helium-rich cataclysmic variable SBSS 1108+574","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"A. 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