The discovery drew upon data from Japan's Subaru Telescope in Hawaii, the Discovery Channel Telescope and the Large Monolithic Imager at Lowell Observatory in Arizona, and the 6.5-meter Magellan Telescopes in Chile.
"These distant objects are like breadcrumbs leading us to Planet X", Sheppard said in a statement.
But the finding is also a reminder that we have a long way to go, "I think that with all of the exciting exoplanet discoveries in recent decades, people often lose sight of the fact that the only planet in our own solar system we could reliably detect around another star like the Sun is Jupiter". 2015 TG387 was nicknamed "The Goblin" by the discoverers, as its provisional designation contains TG and the object was first seen near Halloween. The orbit of 2015 TG387 shares peculiarities with those of other extremely farflung bodies, which appear to have been shaped by the gravity of a very large object in that distant, frigid realm - the hypothesized Planet Nine, also known as Planet X.
Becker says astronomers have only found a handful of objects in addition to The Goblin that point to the existence of Planet Nine, so there is considerable skepticism that it's really out there.
SHEPPARD: There's only one thing we know immediately when we find an object, and we know its distance from the sun. Pluto, by comparison, is approximately between 30 and 50 AU.
The two other dwarf planets are Sedna, discovered in 2003, which is about 620 miles (1,000 kilometers) across, and 2012 VP113, about 310 miles (500 kilometers). The astronomers were lucky to catch the Goblin when they did.
A mysterious tenth planet really may lie at the edge of the solar system, according to new research.
The object, a 200-mile-wide rock with the rather inelegant name of 2015 TG387, is some 7.9 billion miles from the sun. Because in 99% of positions on its orbit the planet is too faint to be seen.
"It took us three years to figure out that it has an interesting orbit", Sheppard said. "This certainly adds to the growing ledger of ... objects that show Planet Nine's influence".
In the most distant part of our solar system, past the orbits of Neptune and Pluto, lurks an undiscovered planet. The AP is exclusively responsible for all content.
That's where Planet X - thought to be slightly smaller than Neptune, but much farther from the sun - comes in.
Dr Sheppard said: 'These so-called Inner Oort Cloud objects like 2015 TG387, 2012 VP113, and Sedna are isolated from most of the Solar System's known mass, which makes them immensely interesting. "These simulations do not prove that there's another massive planet in our solar system, but they are further evidence that something big could be out there".
"Despite centuries of surveys, our understanding of the solar system remains incomplete", he said. Batygin, in a 2016 paper in the Astronomical Journal, estimated Planet Nine would be up to 10 times as massive as Earth. At TG387'smost distant spot in its orbit, traveling there would be the equivalent to circling the earth seven times, or traveling three-quarters of the way to the moon. "It turns out that Planet Nine provides a natural avenue for their generation".