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Bannister and her colleagues think the object may have been banished as far as 2,000 au from the Sun before it began easing its way back towards the star’s gravitational pull. L91’s orbit “is changing in quite a remarkable way”, she said.
But Konstantin Batygin, an astronomer at the California Institute of Technology in Pasadena, isn’t so sure. He thinks Bannister’s suggestion that L91 was first tossed towards the Oort cloud and is now moving inward is too complicated. He argues that an unseen giant planet — such as Planet Nine, which he and a colleague proposed in January — might instead be shepherding L91’s orbit more simply and directly.
Bannister counters that L91 travels an orbit that is almost within the plane of the Solar System, rather than being tilted at high angles, as might be expected if it were being battered around by a Planet Nine.
ou're right, we haven't discussed this new object here. But whether L91 serves as evidence for Planet Nine is questionable: www.nature.com...
originally posted by: masterp
Well, planet 9 itself may not come closer than 200 AUs to the sun, but a body orbiting it might do so.
I.e. planet 9 may be a brown dwarf with planets orbiting it, which may come closer than 200 AUs to the sun.