The astronomers called it Goblin and point out that it could be key to finding the mythical Planet 9.
A team of astronomers led by Scott Sheppard of the Carnegie Institution For Science in Washington have discovered a new dwarf planet on the outer edge of the Solar System they have dubbed Goblin, making it more likely to find the Super-Earth also known as Planet 9.
The newly discovered object, with the technical name 2015 TG387, was made public in a bulletin of the International Astronomical Union, and was called Goblin because it was first seen a few days before Halloween in 2015.
Goblin has a spherical shape barely 300 kilometers in diameter and is classified as an extreme trans-Neptunian object since its orbit is furthest from Neptune. It is mentioned that its perihelion is located at 80 astronomical units of the Sun (unit equivalent to the distance between the Earth and the Sun), while Pluto is at 34 astronomical units of the Sun.
David Tholen of the University of Hawaii commented, “We believe there may be thousands of small bodies like 2015 TG387 at the limits of the Solar System, but the distance makes finding them very difficult.” Currently we could only detect 2015 TG387 when it was close to its closest approximation to the Sun. For about 99 percent of its 40,000-year orbit, it would be too weak to be seen. ”
The importance of this discovery is that it gives strength to the theory of the existence of a much larger planet located beyond Pluto, since the so-called Super-Earth would have a gravitational pull that would explain the peculiar movements of Goblin, which do not interact with the internal planets of the system.