  Planet Nine is a hypothetical planet located well beyond Pluto that has been
proposed in an attempt to explain the observed clustering in physical space of
the perihelia of six extreme trans-Neptunian objects or ETNOs. The predicted
approximate values of its orbital elements include a semimajor axis of 700 au,
an eccentricity of 0.6, an inclination of 30 degrees, and an argument of
perihelion of 150 degrees. Searching for this putative planet is already under
way. Here, we use a Monte Carlo approach to create a synthetic population of
Planet Nine orbits and study its visibility statistically in terms of various
parameters and focusing on the aphelion configuration. Our analysis shows that,
if Planet Nine exists and is at aphelion, it might be found projected against
one out of four specific areas in the sky. Each area is linked to a particular
value of the longitude of the ascending node and two of them are compatible
with an apsidal anti-alignment scenario. In addition and after studying the
current statistics of ETNOs, a cautionary note on the robustness of the
perihelia clustering is presented.
