New Kuiper Belt object challenges Planet Nine theory
10 reported2 unconfirmed
A newly discovered object in the Kuiper Belt is raising questions about the existence of a hypothetical ninth planet, according to a report from The Conversation. The object, designated 2023 KQ14, was found by the Subaru telescope in Hawaii and is classified as a sednoid, meaning it spends most of its time far from the Sun and is largely unaffected by Neptune's gravity. Its orbit is highly elliptical but more stable than a similar object discovered in 2018, suggesting that no large planet is significantly influencing its path. If Planet Nine exists, the report states, it may need to be farther than 500 astronomical units from the Sun. The Planet Nine theory was proposed in 2016 by Caltech astronomers Konstantin Batygin and Mike Brown to explain unusual orbits among distant Kuiper Belt objects. Astronomer Mike Brown stated in 2024 that he considers it very unlikely Planet Nine does not exist, citing a lack of alternative explanations for observed effects. The report notes that the outer Solar System has not been observed long enough to confirm gravitational effects, as some objects have orbital periods of about 24,000 years.
What’s reported
The object 2023 KQ14 was discovered by the Subaru telescope in Hawaii.
It is a sednoid, meaning Neptune's gravity has little to no effect on it.
Its closest approach to the Sun is about 71 AU; its farthest is about 433 AU.
Its orbit is more stable than 2017 OF201, a similar object discovered in 2018.
The stable orbit suggests no large planet is significantly affecting its path.
If Planet Nine exists, it may need to be farther than 500 AU from the Sun.
The Planet Nine theory was proposed in 2016 by Caltech astronomers Konstantin Batygin and Mike Brown.
Mike Brown stated in 2024: "I think it is very unlikely that P9 does not exist."
2023 KQ14 is the fourth sednoid discovered; the other three also exhibit stable orbits.
It would take an estimated 118 years for a spacecraft to travel far enough to find Planet Nine, based on New Horizons' speed.
Open questions
Whether Planet Nine actually exists or is a misinterpretation of orbital data.
Whether alternative explanations, such as a ring of debris or a small black hole, could account for the observed orbital effects.
Key figures
Konstantin Batygin, astronomer at Caltech
Mike Brown, astronomer at Caltech
Ian Whittaker, Senior Lecturer in Physics at Nottingham Trent University (author of the original article)
Sources: ScienceDaily
