Washington, DC—Carnegie’s Scott Sheppard and his colleagues—Northern Arizona University’s Chad Trujillo, and the University of Hawaii’s David Tholen — are once again redefining our Solar System’s edge. They discovered a new extremely distant object far beyond Pluto with an orbit that supports the presence of an even-farther-out, Super-Earth or larger Planet X.
The newly found object, called 2015 TG387, was announced Tuesday by the International Astronomical Union’s Minor Planet Center. A paper with the full details of the discovery has also been submitted to The Astronomical Journal.
2015 TG387 was discovered about 80 astronomical units (AU) from the Sun, a measurement defined as the distance between the Earth and 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.
. . .
Read the entire article from Carnegie Science: New extremely distant Solar System object found during hunt for Planet X | Carnegie Institution for Science