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Here, we re-classify this object as a usdL1.5 subdwarf based on a new optical and near-infrared spectrum obtained with X-shooter on the Very Large Telescope. Spectral fitting with BT-Settl models leads to $T_{\\rm eff}$ = 2450 $\\pm$ 150 K, [Fe/H] = $-$2.4 $\\pm$ 0.2 and log $g$ = 5.5 $\\pm$ 0.25. We estimate a mass for SDSS J010448.46+153501.8 of 0.086 $\\pm$ 0.0015 M$_{\\odot}$ which is just belo"},"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":"1702.02001","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2017-02-07T13:24:43Z","cross_cats_sorted":[],"title_canon_sha256":"2529ebdf53224e761c4c5d6c4f869af4cdb68f580a71de863e7dcae64ec6e625","abstract_canon_sha256":"ad1b37fd3c6c63f9b61ca0cd7da24d1d3bbc8eb43a601be043e253c5bfb58469"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:46:37.688272Z","signature_b64":"NbMgvgfBo8dU6EyJu0Ie/sgxAcLeGD5QCtfR/y7BZTYwjgkx+U7MwHDLzDjO7PKUo9LYrJoQAZPhyQUpK0lIAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a2592e5f176eb0468a1ae7de3b82e918d36d6b584061c8f995b12361dd1807ea","last_reissued_at":"2026-05-18T00:46:37.687815Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:46:37.687815Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Primeval very low-mass stars and brown dwarfs - II. 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