The potential discovery of a new dwarf planet, 2017OF201, challenges existing theories about the Kuiper Belt and may provide insights into the elusive Planet Nine.
A team of scientists at the Institute for Advanced Study School of Natural Sciences in Princeton, New Jersey, has announced the potential discovery of a new dwarf planet. This finding could lead to further evidence supporting the existence of a theoretical super-planet known as Planet Nine.
The object, designated 2017OF201, is classified as a trans-Neptune Object (TNO), which refers to minor planets orbiting the Sun at distances greater than Neptune. Located at the edge of our solar system, 2017OF201 stands out due to its large size and extreme orbit.
Led by Sihao Cheng, along with colleagues Jiaxuan Li and Eritas Yang, the team utilized advanced computational methods to identify the object’s distinctive trajectory in the sky. Cheng noted that the object’s aphelion—the farthest point in its orbit from the Sun—is more than 1,600 times that of Earth’s orbit. In contrast, its perihelion, or the closest point to the Sun, is 44.5 times that of Earth’s orbit, which is similar to Pluto’s orbit.
2017OF201 takes approximately 25,000 years to complete one orbit around the Sun. Yang suggested that the object likely experienced close encounters with a giant planet, which may have caused it to be ejected into its wide orbit.
Cheng further elaborated on the object’s migration history, proposing that it may have initially been ejected into the Oort Cloud, the most distant region of our solar system that contains many comets, before being sent back toward its current position.
This discovery has significant implications for our understanding of the outer solar system’s layout. In January 2016, astronomers Konstantin Batygin and Mike Brown from the California Institute of Technology (Caltech) presented research suggesting the existence of a planet approximately 1.5 times the size of Earth located in the outer solar system. However, the existence of this so-called Planet Nine remains purely theoretical, as neither astronomer has directly observed the planet.
The theory posits that Planet Nine could be roughly the size of Neptune, situated far beyond Pluto in the Kuiper Belt region where 2017OF201 was found. If it exists, it is theorized to possess a mass up to ten times that of Earth and to orbit the Sun at a distance up to 30 times greater than that of Neptune. Such a planet would take between 10,000 and 20,000 Earth years to complete a single orbit around the Sun.
Previously, the area beyond the Kuiper Belt, where 2017OF201 is located, was thought to be largely empty. However, the team’s discovery suggests that this region may be more populated than previously believed.
Cheng emphasized that only about 1% of 2017OF201’s orbit is currently visible to astronomers. “Even though advances in telescopes have enabled us to explore distant parts of the universe, there is still a great deal to discover about our own solar system,” he stated.
Nasa has indicated that if Planet Nine does exist, it could help explain the unique orbits of some smaller objects in the distant Kuiper Belt. As of now, the existence of Planet Nine remains a theoretical concept, resting on gravitational patterns observed in the outer solar system.
According to NASA, the potential discovery of 2017OF201 adds a new layer to the ongoing exploration and understanding of our solar system.