A goblin lurks at the edge of our solar system. Far beyond Pluto, astronomers have found a new dwarf planet that follows the most distant orbit yet confirmed , reaching some 2300 times farther from the sun than Earth’s. Nicknamed “The Goblin” thanks to its discovery around Halloween 2015, 2015 TG387 takes 40,000 years to orbit the sun , researchers report online today on the preprint server arXiv.

The discovery of the 300-kilometer-wide planet was a lucky one. For 99% of its orbit, it would have been too faint to see, but astronomers caught it—using the Subaru 8-meter telescope in Hawaii—as it moved toward its closest approach to the sun. The Goblin now joins a small group of extreme solar system objects whose orbits, which are beyond the gravitational reach of Uranus and Neptune, hint at tugs from a hypothesized, but not yet observed, Planet Nine, hidden in the fringes of the solar system.