"It's pretty faint, so we can really just see that it's there," Sheppard told Space.com. "We don't even know the color of the object; we haven't gotten any spectroscopy on the object yet, or anything like that." (The 186-mile diameter is not a measurement but rather an estimate, assuming a "moderate" reflectiveness for 2015 TG387.) But going back to the orbit: The Goblin is similar in key ways to those of some other extremely distant bodies — particularly in an element called "longitude of perihelion." Basically, the elongated parts of their elliptical orbits are clustered in the same part of the sky, which is consistent with gravitational shepherding by Planet X.
(For perspective: Pluto never gets closer to the sun than 29.7 AU, or farther away than 49.3 AU.) The orbits of the newfound extreme dwarf planet 2015 TG387 and its fellow Inner Oort Cloud objects 2012 VP113 and Sedna, as compared with the rest of the solar system.
"And then if you bring in some of the other extreme objects — several of them were found in our survey as well," Sheppard told Space.com. "The statistics get better and better than this planet is likely out there." The discovery images of 2015 TG387 taken at the Subaru 8-meter telescope located atop Mauna Kea in Hawaii on October 13, 2015.
"What makes this result really interesting is that Planet X seems to affect 2015 TG387 the same way as all the other extremely distant solar system objects," Trujillo, who's based at Northern Arizona University, said in the same statement.
An artist’s illustration of the hypothesized but undiscovered Planet X, which could be shaping the orbits of smaller extremely distant outer solar system objects like 2015 TG387.

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