  The Schwarzschild--de Sitter space--time describes the gravitational field of
a spherically symmetric mass in a universe with cosmological constant
$\Lambda$. Based on this space--time we calculate Solar system effects like
gravitational redshift, light deflection, gravitational time delay, Perihelion
shift, geodetic or de Sitter precession, as well as the influence of $\Lambda$
on a Doppler measurement, used to determine the velocity of the Pioneer 10 and
11 spacecraft. For $\Lambda=\Lambda_0 \sim 10^{-52} {\rm m}^{-2}$ the
cosmological constant plays no role for all of these effects, while a value of
$\Lambda \sim - 10^{-37} {\rm m}^{-2}$, if hypothetically held responsible for
the Pioneer anomaly, is not compatible with the Perihelion shift.
