FOSSIL (Formation of the Outer Solar System: An Icy Legacy) leverages the wide-field capabilities of Subaru Telescope to explore distant solar system bodies. Subsequent follow-up imaging with the Canada-France-Hawaii Telescope in July 2024, along with archival data, enabled astronomers to map 2023 KQ14's orbit over nearly two decades.
The object's highly eccentric and distant orbit classifies it as a "sednoid," a category previously consisting of just three known bodies. Numerical simulations from the FOSSIL team-performed in part using computing clusters at Japan's National Astronomical Observatory-suggest 2023 KQ14 has followed a stable trajectory for 4.5 billion years. Although it differs now, its orbit likely resembled those of other sednoids around 4.2 billion years ago.
This discrepancy points to a more dynamic outer Solar System than previously theorized. The discovery has implications for the Planet Nine hypothesis, which proposes an unseen massive planet as the cause of these unusual orbits. Dr. Yukun Huang notes, "The fact that 2023 KQ14's current orbit does not align with those of the other three sednoids lowers the likelihood of the Planet Nine hypothesis. It is possible that a planet once existed in the Solar System but was later ejected, causing the unusual orbits we see today."
Dr. Fumi Yoshida adds, "2023 KQ14 was found in a region far away where Neptune's gravity has little influence. The presence of objects with elongated orbits and large perihelion distances in this area implies that something extraordinary occurred during the ancient era when 2023 KQ14 formed. Understanding the orbital evolution and physical properties of these unique, distant objects is crucial for comprehending the full history of the Solar System. At present, the Subaru Telescope is among the few telescopes on Earth capable of making such discoveries. I would be happy if the FOSSIL team could make many more discoveries like this one and help draw a complete picture of the history of the Solar System."
Research Report:Discovery and Dynamics of a Sedna-like Object with a Perihelion of 66 au
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