  We present a search for Planet Nine using the second data release of the
Pan-STARRS1survey. We rule out the existence of a Planet Nine with the
characteristics of that predicted in Brown & Batygin (2021) to a 50% completion
depth of $V=21.5$. This survey, along with previous analyses of the Zwicky
Transient Facility (ZTF) and Dark EnergySurvey (DES) data, rules out 78% of the
Brown \& Batygin parameter space. Much of the remaining parameter space is at
$V>21$ in regions near and in the area where the northern galactic plane
crosses the ecliptic.
