Scientists have discovered a distant object at the edge of the solar system, which completes one orbit around the Sun every 40,000 years, a finding that supports the presence of Planet X. The newly found object, called 2015 TG387, was discovered about 80 astronomical units (AU) from the Sun. AU is a measurement defined as the distance between Earth and the Sun. For context, Pluto is around 34 AU, so 2015 TG387 is about two and a half times further away from the Sun than Pluto is right now.
Extremely distant solar system object discovered
"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," said Scott Sheppard, from Carnegie. "They can be used as probes to understand what is happening at the edge of our Solar System," said Sheppard. The object with the most-distant orbit at perihelion, 2012 VP113, was also discovered by Sheppard and Trujillo, who announced that find in 2014.
The discovery of 2012 VP113 led Sheppard and Trujillo to notice similarities of the orbits of several extremely distant solar system objects, and they proposed the presence of an unknown planet several times larger than Earth -- sometimes called Planet X or Planet 9 -- orbiting the Sun well beyond Pluto at hundreds of AUs.