Scientists may have glimpsed the elusive and mysterious Planet Nine — that is, if it actually exists — back in 1983.
That's according to Michael Rowan-Robinson, an astronomer at the Imperial College London, who analyzed observations made by the Infrared Astronomical Satellite (IRAS) back in 1983.
In a new paper, which has yet to be peer reviewed, Rowan-Robinson argues that shots from the telescope could actually turn out to show a ninth planet orbiting our Sun.
Despite the excitement, chances are slim.
"Given the poor quality of the IRAS detections, at the very limit of the survey, and in a very difficult part of the sky for far infrared detections, the probability of the candidate being real is not overwhelming," he wrote in the preprint earlier this month.
"However, given the great interest of the Planet Nine hypothesis, it would be worthwhile to check whether an object with the proposed parameters and in the region of sky proposed, is inconsistent with the planetary [trajectories]," he wrote.
In 2016, a pair of Caltech astronomers proposed that strangely behaving objects in the Kuiper Belt were being affected by a great gravitational pull of something with a huge mass.
They suggested at the time that a ninth planet, up to ten times the mass of the Earth, could be causing these Trans-Neptunian Objects (TNOs) to behave so erratically.
But extensive searches have yet to come up with proof that Planet Nine actually exists. If it does exist, it is extremely far away and doesn't receive much light from the Sun.
Now, Rowan-Robinson has come up with three point sources, each detected roughly a month apart, picked from around 250,000 total sources detected by IRAS. These three sightings could point to the existence of a single transient object, the astronomer suggests in his paper.
If Rowan-Robinson is correct, the planet would be somewhere between three to five times the mass of the Earth, orbiting the Sun 225 times the distance between the Earth and the Sun. Neptune orbits the Sun at around 30 astronomical units.
The researcher is now suggesting that we analyze infrared and optical data at these three locations.
It may be a long shot — but it's an exciting new chapter in our hunt for the elusive Planet Nine as well.
READ MORE: Mysterious Object Glimpsed Decades Ago Might Have Actually Been Planet Nine [ScienceAlert]
More on planet nine: Planet Nine Might Not Actually Exist, Scientists Say
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