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The supernova exploded in an isolated region at $\\sim 65$~kpc from the S0 galaxy IC~550 at $z=0.0165$ ($D\\approx 74$~Mpc) and has a redshift consistent with a physical association to this galaxy. Multicolor photometry show that SN2018cqj/ATLAS18qtd is a low-luminosity ($M_{B_{max}}\\approx -17.9$ mag), fast-declining Type Ia with color stretch $s_{BV} \\approx 0.6$ and $B$-band decline rate $\\Delta m_{15}(B) \\approx 1.77$ mag. Two nebular-phase spectra obtained as part of the 100IAS survey at +193 and +"},"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":"1909.05267","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-09-11T18:00:13Z","cross_cats_sorted":["astro-ph.GA","astro-ph.SR"],"title_canon_sha256":"4322cb90b78c71cea78aaa0c882394fe4b5621ca5882248816e28a38c5541012","abstract_canon_sha256":"aed428ca9806440e63438177ac767a376ac5fa3b8b28d6f28f2d11e3ad9a997f"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:39:57.573085Z","signature_b64":"Ii4f1IPG4eM1ta0xmqUIgN61nkPCBjMXaleAqSzJ4sosU2arhLa6DQUEjFM3idgEV7jN1ZEJtnH3Cg1svt/JDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6e3befd4f65cc485cc3ec297bf3e905324a2f68822723154cf9a6571858ceeaf","last_reissued_at":"2026-07-05T00:39:57.572647Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:39:57.572647Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Variable H$\\alpha$ Emission in the Nebular Spectra of the Low-Luminosity Type Ia SN2018cqj/ATLAS18qtd","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA","astro-ph.SR"],"primary_cat":"astro-ph.HE","authors_text":"A. 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