New dwarf planet spotted at the edge of the solar system

image via New Scientist

May 22, 2025, 8:00 PM

• •2017 OF201, a potential dwarf planet, has an unusual orbit.
• •This challenges the existence of the hypothetical Planet 9.
• •The object's orbit doesn't fit the pattern of other extreme trans-Neptunian objects.
• •More data from observatories like the Vera C. Rubin Observatory is needed.

The discovery of the potential dwarf planet 2017 OF201 in the outer solar system challenges the existence of Planet 9. Its far-flung orbit, which doesn't align with the clustering of other extreme trans-Neptunian objects, weakens evidence for a hidden ninth planet. Simulations suggest Planet 9 might eject 2017 OF201, providing further doubt. However, more data from upcoming observatories is needed to confirm or refute Planet 9's existence.

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