Meet “Ammonite” – Fossil World at Solar System’s Edge Challenges Planet Nine Theory
Astronomers identified trans-Neptunian object 2023 KQ14, nicknamed Ammonite, using Subaru’s telescope in early 2023. Follow-up and archival data extended its observation arc to 19 years. Ammonite’s highly eccentric orbit and misaligned direction set it apart from known sednoids. Estimated diameter is 220–380 km; its orbit may take about 4,000 years.