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This proper motion is a weighted mean of four independent measurements for three distinct fields. Each measurement uses a quasi-stellar object as a reference point. Removing the contribution of the motion of the Sun and of the Local Standard of Rest to the measured proper motion produces a Galactic rest-frame proper motion of $(\\mu_{\\alpha}^{\\mbox{\\tiny{Grf}}}, \\mu_{\\delta}^{\\mbox{\\tiny{Grf}}}) = (24.4\\pm 4.6,-14.3\\pm 4.1)$ mas cen"},"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":"astro-ph/0612705","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2006-12-22T22:14:26Z","cross_cats_sorted":[],"title_canon_sha256":"026784f7f8e0b8d108e3db4ca121bddd45a3b10e9ba848308e9288a801561d83","abstract_canon_sha256":"6d73f40076830c09ab5737d9b00d5e88df0f600a218439dcbc03c17217fc85c4"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:40:27.273879Z","signature_b64":"svlFARgwUFOc5igsOUZ5YAtBcljeL+CXRNoq73mebJWe9M9PS5Y9F3p1f5TsGr2bthIuYyxql03m99JEU2OVBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"adf8252d1280798951f4589f9171c5a63e8aa1cca9037e1f2534e622273cd499","last_reissued_at":"2026-05-18T01:40:27.273142Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:40:27.273142Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Proper Motions of Dwarf Spheroidal Galaxies from Hubble Space Telescope Imaging. 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