2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/104467In this note we show that the latest determinations of the residual Mercury's perihelion advance, obtained by accounting for almost all known Newtonian and post-Newtonian orbital effects, yields only very broad constraints on the cosmological constant. Indeed, from δ\dotω=-0.0036 + - 0.0050 arcseconds per century one gets -2 10^-34 km^-2 < Lambda < 4 10^-35 km^-2. The currently accepted value for Lambda, obtained from many independent cosmological and large-scale measurements, amounts to almost 10^-46 km^-2.Latex2e, 4 pages, 2 table, no figures, 11 references. Table 2 added, typos in the units of Lambda correctedGeneral Relativity and Quantum CosmologyAstrophysicsHigh Energy Physics - Phenomenologytext