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Newly Discovered Object on the Edges of the Solar System Takes 25 Thousand Years to Complete One Orbit Around the Sun and Intrigues Scientists with Its Unusual Orbit.
Well beyond Neptune and even Pluto, a new icy body has been identified in the depths of space. Named 2017 OF201, the object is so distant that its orbit around the Sun takes nearly 25,000 years to complete. The discovery reinforces that the solar system still hides many secrets.
This small world is not a planet like Earth. It is also not the sought-after Planet X. But its existence may change some ideas that scientists had about the fringes of our system.
A Smaller Planet at the Edge of the Solar System
With about 700 kilometers in diameter, 2017 OF201 is among the largest objects found in the last ten years.
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This size places it in the category of dwarf planets , assuming its shape is indeed spherical, which depends on the object’s own gravity.
But what truly draws attention is its orbit. At its closest approach to the Sun, it reaches 45 astronomical units — roughly the same distance as Pluto.
At its farthest point, it goes over 1,600 astronomical units. This means that, in its complete journey, the object takes such a wide orbit that it hardly seems to belong to the solar system.
Detected in Old Images
The discovery was not made in real-time. The object appeared in images from past observations made by telescopes such as the Dark Energy Camera and the Canada-France-Hawaii Telescope.
Leading the identification was Sihao Cheng from the Institute for Advanced Study in Princeton.
The team analyzed records from 2011 to 2018 and found 19 images of 2017 OF201. Based on this, researchers were able to track its trajectory.
According to them, the motion was too slow for a nearby asteroid, but too consistent to be a mistake. It was indeed a new body in orbit.
“It became quite clear that they correspond to a single object in motion that has an extremely wide and eccentric orbit,” they stated in the article published in arXiv.
A Challenge to Planet Nine
Over the past few years, many astronomers have been studying objects that lie beyond Neptune. They are called extreme trans-Neptunian objects (ETNOs).
Most have similar orbits, as if something larger were influencing them. This behavior led to the hypothesis of Planet X, a giant body yet to be detected.
However, 2017 OF201 does not follow this pattern. Its position in orbit is out of alignment with the other ETNOs. This caught the team’s attention.
“Notably, the perihelion longitude of 2017 OF201 is well outside the clustering observed in extreme trans-Neptunian objects,” the scientists wrote.
In simulations done with a hypothetical Planet X, the result was even more surprising: 2017 OF201 was completely expelled from the solar system in those models. This raises doubts about the existence of a ninth planet in the current molds.
Bright, Distant and Possibly Spherical
Even at such a distance, 2017 OF201 is considered bright for its location. By combining this brightness with reflectivity estimates, the team calculates that it has a width of 700 kilometers. That is about one-third of Pluto and almost the size of Ceres, the largest body in the asteroid belt.
This brightness also indicates that the object may be spherical, a requirement to be considered a dwarf planet. If confirmed, it could join the group of Pluto, Eris, and other similar bodies.
But perhaps the most interesting aspect is what its discovery suggests: that there are many other similar objects out there. According to Cheng, 2017 OF201 is only visible in 0.5% of its orbit. This means there is a real chance that there are many other similar objects that have yet to be detected.
The total mass of this group could equal 1% of the mass of Earth — the same approximate value as the entire Kuiper Belt.
Expelled by Neptune, Pulled by the Galaxy
Where did 2017 OF201 come from? The scientists’ hypothesis is that it was once closer to the Sun. At some point, Neptune may have pushed it away with its gravity. As it moved away, the galaxy itself — yes, the Milky Way — would have influenced its trajectory with gravitational tides.
This effect would have raised its orbit to the current point. The last time the object came close to Earth was in November 1930. It will only return here in about 25,000 years.
The coincidence is curious: 1930 was also the year Pluto was discovered and the year the Institute for Advanced Study was founded, where Cheng currently works.
The discovery of 2017 OF201 is a direct result of the analysis of old data. The telescopes that helped in the discovery targeted distant galaxies. But they ended up contributing to reveal a new body from our own solar system.
As it continues its slow and silent orbit, like a lost iceberg in space, its presence sheds light on the vastness still little known around the Sun. And reminds us that there is still much to be discovered — even here, in our cosmic neighborhood.
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