Astronomers have discovered a new dwarf planet that is in orbit well beyond Pluto. This object, first detected by the Japanese Subaru telescope in Hawaii in March 2023, is called the 2023 KQ14 and is called ammonite. The ammonite appearance also places a twist on what is known as the Planet 9 hypothesis.
A team led by Japanese researchers presented Ammonite’s discoveries in a paper published in the Nature Astronomy Journal on July 14th. The body gains its fame from long, creative cephalopod fossils, as it was identified as an ice-like heritage or part of a fossil that is part of the formation of the outer solar system research project.
Ammonite is classified as a cedonoid. This is an object that transcends the outermost confirmed planet of the solar system and has a singular orbit. It is now the fourth cedonoid discovered. The term “cedonoid” comes from the dwarf planet Sedona, which resides on the edge of the solar system and was discovered in 2004.
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When describing the orbit of a celestial body, astronomers use the Astronomical Unit (AU). The distance between the Earth and the Sun is approximately 1 au. Following the elliptical path, Sedona is about 76 au from the Sun at its nearest point (approximation) and 900 au at its farthest (atherion). Ammonite, on the other hand, is at its closest and farthest point in orbit, between 66 and 252 Au from the Sun.
According to the research authors, the discovery of 2023 KQ14 undermines the possibility that there may be a ninth planet in the solar system. The Planet Nine Hypothesis, originally proposed in 2016, suggests that there could be a Neptune-sized planet orbiting the Sun about 20-30 times more Solid than Neptune.
This planet describes the eccentric orbit of the small body of the Kuiper Belt, a vast vast expanse of ice rocks that include the outer solar system. It is believed that the gravity of much larger bodies, like planets, could be shepherds these small objects. However, the relationship between the latest cedonoid trajectories and the relationship between the three other known cedonoids questions this hypothesis.
“The Planet 9 hypothesis is based on the fact that known cedonoids have orbital clusters on one side of the solar system,” Shiang-Yu Wang, a researcher at the Institute of Astronomical and Astrophysics in Taiwan, told Live Science in an email.
Related: What is a Dwarf Planet? And how many are there?
Ammonites are unique among these cedonoids because their orbits are on the opposite side. The farthest point from the sun is in the opposite direction to the farthest point of the other cedonoids. The fact that there are currently known objects orbiting this path reduces the likelihood that a large planet is there.
“The fact that the current orbit of the 2023 KQ14 does not match the orbit of the other three cedonoids reduces the likelihood of the planet 9 hypothesis,” co-author Yukun Huang said he is a project researcher for the National Astronomical Observer at the Japan Center for Computer Astronomy. “It is possible that the planet once existed in the solar system, but was later kicked out and caused the unusual orbits we see today.”
Other astronomers also believe that ammonites will throw wrenches at this hypothesis. “The problem is that the evidence from this alignment is scientifically persuasive and has not actually become stronger, even in the last decade or so,” David Jewyat, an astronomy professor at the University of California, Los Angeles, who was not involved in the discovery of ammonite, told Live Science.
“Ammonite does not line up with these six other objects, which means it weakens the planet nine case or it is very far away and difficult to detect accordingly,” Christopher Impey, an astronomy professor at the University of Arizona who was not involved in the discovery of cedonoids, told Live Science.
However, Impey is confident that if there is actually Planet 9, Chile’s newly activated Vera C. Rubin Observatory will soon be able to confirm it. “If Planet 9 exists, we will almost certainly find it in that survey data within a few years,” he said.
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