The Goblin, a dwarf planet, found far beyond Pluto

Carnegie Institution for Science

Carnegie Institution for Science

An illustration of the possible planet that could be shaping the orbit of objects such as the Goblin.

The discovery gives further credence to the hypothesis that Planet X, which could be 10 times the size of Earth, could be influencing the orbits of objects like 2015 TG387 within the Kuiper Belt. One AU is the distance from Earth to the sun, or roughly 93 million miles (150 million kilometers).

No doubt the observation and naming of The Goblin-which is about 186 miles across, takes 40,000 years to orbit the sun-will set off new debates around planetary categorization. Only 2012 VP113 and Sedna, at 80 and 76 AU respectively, have more distant perihelia than 2015 TG387. It doesn't interact gravitationally with the other planets in our Solar System, but is bound to the Sun.

"Planet X seems to affect 2015 TG387 the same way as all the other extremely distant Solar System objects".

"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", Carnegie Institution for Science professor Sheppard said in a statement. "We are only seeing the tip of the ice berg".

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Sheppard and Trujillo, an assistant professor at Northern Arizona University, previously discovered 2012 VP113, which was revealed in 2014.

Scientists have discovered a dwarf planet in the outermost reaches of the solar system.

They have classified it as an inner Oort Cloud object since it hovers within the shell of distant icy objects covering the Solar System.

In fact, the object is so far away that even during its perihelion-the part of the orbit that is closest to the Sun-it is no more than 65 AU. For some 99 percent of their orbits, they are too distant and thus too faint for us to observe them.

With its discovery, the object - officially called 2015 TG387 - is the third dwarf planet to be discovered in the outer solar system, following the locating of Sedna and another object dubbed 2012 VP113. "Or, you never know, if we find more of these, maybe they'll stop pointing toward the planet". It's a member of a group called extreme trans-Neptunian objects, which means that its orbit sees it travel to incredible distances from our star and that orbit might actually be the result of The Goblin's interaction with a planet that has yet to be found. Most simulations showed that the Goblin's orbit would have been stable for the age of the Solar System. This gravitational shepherding could explain why the most distant objects in our solar system have similar orbits. "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" Trujillo concludes.

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