  We use seven year's worth of observations from the Catalina Sky Survey and
the Siding Spring Survey covering most of the northern and southern hemisphere
at galactic latitudes higher than 20 degrees to search for serendipitously
imaged moving objects in the outer solar system. These slowly moving objects
would appear as stationary transients in these fast cadence asteroids surveys,
so we develop methods to discover objects in the outer solar system using
individual observations spaced by months, rather than spaced by hours, as is
typically done. While we independently discover 8 known bright objects in the
outer solar system, the faintest having $V=19.8\pm0.1$, no new objects are
discovered. We find that the survey is nearly 100% efficient at detecting
objects beyond 25 AU for $V\lesssim 19.1$ ($V\lesssim18.6$ in the southern
hemisphere) and that the probability that there is one or more remaining outer
solar system object of this brightness left to be discovered in the unsurveyed
regions of the galactic plane is approximately 32%.
