2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/141837In this paper we present a rather extensive error budget for the difference of the perigees of a pair of supplementary SLR satellites aimed to the detection of the Lense-Thirring effect.LaTex2e, 14 pages, 1 table, no figures. Some changes and additions to the abstract, Introduction and Conclusions. References updated, typos corrected. Equation corrected. To appear in General Relativity and GravitationGeneral Relativity and Quantum CosmologyAstrophysicsSpace Physicstext