there is this recent article about finding a possible transneptunian planet candidate
https://arxiv.org/pdf/2111.03831.pdf
The candidate discussed here would be likely to have mass 3-5 MEarth if it was in fact a planet and not something else
what interests me is how we didn't find it in later surveys of the night sky...
Unfortunately, the most likely explanation for not finding it in later surveys is that this object is an artifact of the image, not a real thing. But I'm sure people will be looking now.
Phil
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its possible it would just be an artifact in the data or a distant IR object
we need to see if the object moves in multiple images (like how we detect new dwarf planets or comets), if it moves, than we are onto something, if it does not, its a distant IR object or something else, and if its nowhere to be found, than its just a hiccup (artifact) in the data
There is an afterword in that paper that had me checking the http://findplanetnine.blogspot.com/. There are a few 2021 updates that I hadn't seen.
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