  We have computed the deflection angles caused by 195 objects in the solar
system, including 177 satellites and eight asteroids. Twenty-one satellites and
six asteroids can bend light from distant compact extragalactic sources by more
than 0.1 $\mu$as, and fourteen satellites and the asteroid Ceres can deflect
light by more than 1.0 $\mu$as. We calculated the zones and durations of
perturbations posed by the gravitational fields of five planets (excluding
Earth, Jupiter, and Saturn), Pluto, and Ceres, where the perturbations would
affect astrometry measured with the Squared Kilometre Array (SKA). Perturbed
zones with deflection angles larger than 0.1 and 1.0 $\mu$as appear as ribbons.
Their widths range from dozens of degrees for Uranus, Neptune, and Venus to
several degrees or less for other objects at 0.1 $\mu$as, and from $\sim$
16$^{\circ}$ for Venus to several degrees or less for other objects at 1.0
$\mu$as. From the calculated perturbation durations, the influence of the
gravitational fields of selected objects can be divided into four levels:
hardly affect SKA astrometry (I), may have little effect (II), may have a great
effect (III) on single-epoch astrometry, and may greatly affect both single-
and multi-epoch astrometry (IV). The objects corresponding to these levels are
Ceres (I), Pluto (II), Mercury and Mars (III), and other objects (IV).
