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Inner Oort Cloud objects (IOCs) are Trans-Plutonian for their entire orbits.They are beyond the strong gravitational influences of the known planets yetclose enough to the Sun that outside forces are minimal. Here we report thediscovery of the third known IOC after Sedna and 2012 VP113, called 2015 TG387.2015 TG387 has a perihelion of $65 \pm 1$ au and semi-major axis of $1170 \pm70$ au. The longitude of perihelion angle, $\bar{\omega}$, for 2015 TG387 isbetween that of Sedna and 2012 VP113, and thus similar to the main group ofclustered extreme trans-Neptunian objects (ETNOs), which may be shepherded intosimilar orbital angles by an unknown massive distant planet, called Planet X orPlanet Nine. 2015 TG387's orbit is stable over the age of the solar system fromthe known planets and Galactic tide. When including outside stellar encountersover 4 Gyrs, 2015 TG387's orbit is usually stable, but its dynamical evolutiondepends on the stellar encounter scenarios used. Surprisingly, when including amassive Planet X beyond a few hundred au on an eccentric orbit that isanti-aligned in longitude of perihelion with most of the known ETNOs, we find2015 TG387 is typically stable for Planet X orbits that render the other ETNOsstable as well. Notably, 2015 TG387's argument of perihelion is constrained andits longitude of perihelion librates about 180 degs from Planet X's longitudeof perihelion, keeping 2015 TG387 anti-aligned with Planet X over the age ofthe solar system. We find a power law slope near 3 for the semi-major axisdistribution of IOCs, meaning there are many more high than low semi-major axisIOCs. There are about 2 million IOCs larger than 40 km, giving a mass of$10^{22}$ kg. The IOCs inclination distribution is similar to the scattereddisk, with an average inclination of 19 degs.

A New High Perihelion Inner Oort Cloud Object: 2015 TG387