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<p>Trans-Neptunian objects (TNOs) with large perihelion distances (<i>q</i> &gt; 60 au) and semi-major axes (<i>a</i> &gt; 200 au) provide insights into the early evolution of the Solar System and the existence of a hypothetical distant planet. These objects are challenging to observe, and thus their detections are still rare, yet they play a crucial role in constraining models of Solar System formation. Here we report the discovery of a Sedna-like TNO, 2023 KQ<sub>14</sub>, nicknamed ‘Ammonite’, with <i>q</i> = 66 au, <i>a</i> = 252 au and inclination <i>i</i> = 11°. The orbit of Ammonite does not align with those of the other Sedna-like objects and fills the previously unexplained ‘<i>q</i>-gap’ in the observed distribution of distant Solar System objects. Simulations demonstrate that Ammonite is dynamically stable over 4.5 Gyr. Our analysis suggests that Ammonite and the other Sedna-like objects may have shared a primordial orbital clustering around 4.2 Ga. Furthermore, the stable orbit of Ammonite favours larger orbits (~500 au) rather than closer ones for a large hypothetical planet in present-day trans-Neptunian space.</p>

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Discovery and dynamics of a Sedna-like object with a perihelion of 66 au

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月14日

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  • Ying-Tung Chen,
  • Patryk Sofia Lykawka,
  • Yukun Huang,
  • JJ Kavelaars,
  • Wesley C. Fraser,
  • Michele T. Bannister,
  • Shiang-Yu Wang,
  • Chan-Kao Chang,
  • Matthew J. Lehner,
  • Fumi Yoshida,
  • Brett Gladman,
  • Mike Alexandersen,
  • Edward Ashton,
  • Young-Jun Choi,
  • A. Paula Granados Contreras,
  • Takashi Ito,
  • Youngmin JeongAhn,
  • Jianghui Ji,
  • Myung-Jin Kim,
  • Samantha M. Lawler,
  • Jian Li,
  • Zhong-Yi Lin,
  • Hong-Kyu Moon,
  • Surhud More,
  • Marco Muñoz-Gutiérrez,
  • Keiji Ohtsuki,
  • Lowell Peltier,
  • Rosemary E. Pike,
  • Tsuyoshi Terai,
  • Seitaro Urakawa,
  • Hui Zhang,
  • Haibin Zhao,
  • Ji-Lin Zhou

摘要

Trans-Neptunian objects (TNOs) with large perihelion distances (q > 60 au) and semi-major axes (a > 200 au) provide insights into the early evolution of the Solar System and the existence of a hypothetical distant planet. These objects are challenging to observe, and thus their detections are still rare, yet they play a crucial role in constraining models of Solar System formation. Here we report the discovery of a Sedna-like TNO, 2023 KQ14, nicknamed ‘Ammonite’, with q = 66 au, a = 252 au and inclination i = 11°. The orbit of Ammonite does not align with those of the other Sedna-like objects and fills the previously unexplained ‘q-gap’ in the observed distribution of distant Solar System objects. Simulations demonstrate that Ammonite is dynamically stable over 4.5 Gyr. Our analysis suggests that Ammonite and the other Sedna-like objects may have shared a primordial orbital clustering around 4.2 Ga. Furthermore, the stable orbit of Ammonite favours larger orbits (~500 au) rather than closer ones for a large hypothetical planet in present-day trans-Neptunian space.