-Recently, together with <a href="https://sihaocheng.github.io/">Sihao Cheng</a> (IAS) and <a href="https://web.astro.princeton.edu/people/eritas-yang">Eritas Yang</a> (Princeton), we discovered an exceptional trans-Neptunian object (TNO) [2017 OF201](https://en.wikipedia.org/wiki/2017_OF201). The most striking feature of 2017 OF201 is that its orbit does not following the apsidal clustering pattern observed in many other extreme TNOs. This pattern is thought to be caused by the gravitational influence of a massive planet beyond Neptune, or so-called <a href="https://en.wikipedia.org/wiki/Planet_Nine">Planet 9 or Planet X</a>. The existence of 2017 OF201 might suggest that Planet 9 or X doesn't exist. Check out our <a href="https://ui.adsabs.harvard.edu/abs/2025arXiv250515806C/abstract">paper</a> for more details. This work was featured in the <a href="https://www.ias.edu/news/extreme-cousin-pluto-possible-dwarf-planet-discovered-solar-systems-edge">IAS</a> and <a href="https://web.astro.princeton.edu/news/princeton-astronomers-discover-extraordinary-distant-object-solar-systems-edge">Princeton University</a> websites, as well as in <a href="https://phys.org/news/2025-05-extreme-cousin-pluto-dwarf-planet.html">Phys.org</a>, <a href="https://www.newscientist.com/article/2481477-new-dwarf-planet-spotted-at-the-edge-of-the-solar-system/">New Scientist</a>, <a href="https://www.universetoday.com/articles/our-solar-system-may-have-a-new-planetary-sibling-another-dwarf-planet">Universe Today</a>, <a href="https://earthsky.org/space/new-minor-planet-found-in-the-distant-solar-system-2017-of201/">EarthSky</a>.
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