  We present photometric observations and numerical simulations of 2016
SD$_{106}$, a low inclination ($i=4.8^{\circ}$) extreme trans-Neptunian Object
with a large semi-major axis ($a=350$ au) and perihelion ($q= 42.6$ au). This
object possesses a peculiar neutral color of $g-r = 0.45\pm0.05$ and
$g-i=0.72\pm0.06$, in comparison with other distant trans-Neptunian objects,
all of which have moderate-red to ultra-red colors. A numerical integration
based on orbital fitting on astrometric data covering eight years of arc
confirms that 2016 SD$_{106}$ is a metastable object without significant
scattering evolution. Each of the clones survived at the end of the 1 Gyr
simulation. However, very few neutral objects with inclinations $<5^{\circ}$
have been found in the outer solar system, even in the main Kuiper belt.
Furthermore, most mechanisms which lift perihelion distances are expected to
produce a very low number of extreme objects with inclinations $<5^{\circ}$. We
thus explored the possibility that a hypothetical distant planet could increase
the production of such objects. Our simulations show that no 2016
SD$_{106}$-like orbits can be produced from three Kuiper belt populations
tested (i.e. plutinos, twotinos, and Haumea Family) without the presence of an
hypothetical planet, while a few similar orbits can be obtained with it;
however, the presence of the additional planet produces a wide range of large
semimajor-axis / large perihelion objects, in apparent contradiction with the
observed scarcity of objects in those regions of phase space. Future studies
may determine if there is a connection between the existence of a perihelion
gap and a particular orbital configuration of an hypothetical distant planet.
