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A New Celestial Body Has Been Identified at the Borders of the Solar System, Raising Doubts About Ancient Astronomical Theories. With Unusual Orbit, the Object Named “Ammonite” May Contain Clues About the Childhood of the System That Houses Earth. The Discovery Was Made by the Subaru Telescope in Hawaii and Amounts to Almost Two Decades of Records.
Astronomers have identified a new and mysterious object in the outskirts of the Solar System. The celestial body, named “Ammonite”, has a diameter between 220 and 380 kilometers and follows an unusual orbit.
The discovery was made using the Subaru Telescope, located at the Mauna Kea Observatory in Hawaii.
The most important thing is that Ammonite joins a very small group of objects known as sednoids. Only three other similar bodies have been identified to date.
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The discovery provides clues about the early moments of the Solar System, according to the researchers responsible.
A Spatial Fossil With 19 Years of Records
The team first detected the new object at three different times in 2023 — March, May, and August.
New observations made in July of the same year confirmed the body and its orbit.
But the most curious finding came afterward. By analyzing old files, scientists found records of the same object in 2021, 2014, and even in 2005, at the Kitt Peak National Observatory.
This old data helped astronomers compile a 19-year history of observations. This allowed them to calculate Ammonite’s orbit with much greater precision. The trajectory, however, does not align with those of the other three known sednoids.
Therefore, Ammonite may indicate that the outer region of the Solar System is more diverse and complex than previously thought.
The Ninth Planet Hypothesis Is in Question
Since the discovery of Sedna, the first sednoid identified in 2003, scientists have been trying to understand why these bodies follow such distant and elongated orbits. One of the main explanations was the presence of an unobserved planet — the so-called Ninth Planet.
The idea is that this planet, with significant mass, would be influencing the orbits of these objects. However, the arrival of Ammonite may weaken this hypothesis. As its orbit does not follow the same pattern as the other sednoids, it raises doubts about the existence of this planet.
“The fact that Ammonite’s current orbit does not align with those of the other three sednoids decreases the likelihood of the Ninth Planet hypothesis,” stated Dr. Yukun Huang from the Computational Astrophysics Center.
Something Extraordinary May Have Happened in the Past
Furthermore, Dr. Fumi Yoshida, who leads the FOSSIL project, pointed out that Ammonite is located in a region where Neptune no longer exerts significant gravitational influence. For him, this indicates that something unusual occurred during the early days of the Solar System, altering the orbits of these objects.
Yoshida suggests that Ammonite preserves “memories” from that time. According to him, understanding the orbital evolution and properties of these bodies is crucial to reconstructing the history of the system that houses Earth.
Other studies have previously proposed that Sedna, for instance, had its orbit altered by ancient events, such as encounters with a nearby star or even by having originated outside the Solar System.
A Small World, Big Implications
Despite its modest size, Ammonite raises huge questions. Because if other objects are discovered with such distinct orbits, all the theory about the influence of a ninth planet could fall apart.
This opens the door for new ideas about what happened in the first millions of years after the Sun’s formation.
Currently, only a few telescopes on Earth are capable of making this type of discovery. Among them, the Subaru Telescope stands out.
“Most of the vast Solar System remains unexplored,” said Yoshida. “I would be happy if the FOSSIL team could make many more discoveries like this and help outline a complete picture of the history of the Solar System,” he added.
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