It takes this planetoid 40,000 years to loop around the Sun once and it's one of the most inhospitable places ever discovered by humans. For comparison, Pluto is around 34 AU away and like Pluto, the Goblin will not see much in the way of Sunlight as the closest it gets to the Sun is around 65 AU.
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.
Prior to finding the Goblin, Sheppard and Trujillo had already found 2012 VP113 - the most-distant object to date. Though 2015 TG387 has the third-most-distant perihelion, its orbital semi-major axis is larger than 2012 VP113 and Sedna's, meaning it travels much farther from the Sun than they do.
"With other large telescopes, it is like looking through a straw and thus they are good for observing things you know are there, but not for finding new things as their field of views are too small for covering large areas of sky", Sheppard said.
Sheppard and Trujillo, an assistant professor at Northern Arizona University, previously discovered 2012 VP113, which was revealed in 2014.
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"We think there could be thousands of small bodies like 2015 TG387 out on the Solar System's fringes, but their distance makes finding them very hard", according to Tholen, of the University of Hawaii.
"Currently we would only detect 2015 TG387 when it is near its closest approach to the Sun".
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.
The scientists discovered 2015 TG387 while searching for Planet X, the hypothetical planet hiding at the outskirts of the Solar System that conspiracy theorists believe will wipe out life on Earth in a massive collision. "They can be used as probes to understand what is happening at the edge of our solar system". According to the paper, " 2015 TG387 continues the longitude clustering trend seen for the inner Oort cloud objects and ETNOs, which might be caused by a massive planet (Planet 9) shepherding these objects".
The first observation of the object was made in October 2015, at the Subaru eight-meter telescope atop Mauna Kea in Hawaii.
2015 TG387 is likely on the small end of being a dwarf planet, since it has a diameter of roughly 300 kilometers.
Simply, the solar system is packed with so many small planets and the discoveries just keep on coming! That's where Planet X comes in.
"This clustering can only be maintained if the solar system hosts an additional, yet unseen, super-Earth type planet", Batygin said.